doc: regenerate groff and html man pages

Fixes #339

.cirrus.yml

@@ -1,9 +0,0 @@
-env:
-  CIRRUS_CLONE_DEPTH: 1
-
-freebsd_12_task:
-  freebsd_instance:
-    image: freebsd-12-1-release-amd64
-  install_script: pkg install -y go
-  build_script: go build -v ./...
-  test_script: go test -race ./...

.github/CONTRIBUTING.md

@@ -0,0 +1,32 @@
+## Issues
+
+I want to hear about any issues you encounter while using age.
+
+Particularly appreciated are well researched, complete [issues](https://github.com/FiloSottile/age/issues/new/choose) with lots of context, **focusing on the intended outcome and/or use case**. Issues don't have to be just about bugs: if something was hard to figure out or unexpected, please file a **[UX report](https://github.com/FiloSottile/age/discussions/new?category=UX-reports)**! ✨
+
+Not all issue reports might lead to a change, so please don't be offended if yours doesn't, but they are precious datapoints to understand how age could work better in aggregate.
+
+## Pull requests
+
+age is a little unusual in how it is maintained. I like to keep the code style consistent and complexity to a minimum, and going through many iterations of code review is a significant toil on both contributors and maintainers. age is also small enough that such a time investment is unlikely to pay off over ongoing contributions.
+
+Therefore, **be prepared for your change to get reimplemented rather than merged**, and please don't be offended if that happens. PRs are still appreciated as a way to clarify the intended behavior, but are not at all required: prefer focusing on providing detailed context in an issue report instead.
+
+<!-- ## Feature requests
+
+age is small, simple, and config-free by design. A lot of effort is put into resisting scope creep and enabling use cases by integrating and interoperating well with other projects rather than by adding features.
+
+In particular, I'm unlikely to merge into the main repo anything I don't use myself, as I would not be the best person to maintain it. However, I'm always happy to discuss, learn about, and link to any age-related project! -->
+
+## Other ways to contribute
+
+age itself is not community maintained, but its ecosystem very much is, and that's where a lot of the strength of age is! Here are some ideas for ways to contribute to age and its ecosystem, besides contributing to this repository.
+
+* **Write an article about how to use age for a certain community or use case.** The number one reason people don't use age is because they haven't heard about it and existsing tutorials present more complex alternatives.
+* Integrate age into existing projects that might use it, for example replacing legacy alternatives.
+* Build and maintain an [age plugin](https://c2sp.org/age-plugin) for a KMS or platform.
+* Watch the [discussions](https://github.com/FiloSottile/age/discussions) and help other users.
+* Provide bindings in a langauge or framework that doesn't support age well.
+* Package age for an ecosystem that doesn't have packages yet.
+
+If you build or write something related to age, [let me know](https://github.com/FiloSottile/age/discussions/new?category=general)! 💖

.github/workflows/build.yml

@@ -1,13 +1,16 @@
+name: Build and upload binaries
 on:
   release:
     types: [published]
   push:
   pull_request:
-name: Build binaries
+permissions:
+  contents: read
 jobs:
-  binaries:
-    name: Build and upload
+  build:
+    name: Build binaries
     runs-on: ubuntu-latest
+    environment: "Build, sign, release binaries"
     steps:
       - name: Install Go
         uses: actions/setup-go@v2
@@ -19,15 +22,27 @@ jobs:
           fetch-depth: 0
       - name: Build binaries
         run: |
-          VERSION=$(git describe --tags)
+          sudo apt-get update && sudo apt-get install -y osslsigncode
+          cp LICENSE "$RUNNER_TEMP/LICENSE"
+          echo -e "\n---\n" >> "$RUNNER_TEMP/LICENSE"
+          curl "https://golang.org/LICENSE?m=text" >> "$RUNNER_TEMP/LICENSE"
+          VERSION="$(git describe --tags)"
           function build_age() {
             DIR="$(mktemp -d)"
             mkdir "$DIR/age"
-            cp LICENSE "$DIR/age"
-            echo -e "\n---\n" >> "$DIR/age/LICENSE"
-            curl "https://golang.org/LICENSE?m=text" >> "$DIR/age/LICENSE"
-            go build -o "$DIR/age" -ldflags "-X main.Version=$VERSION" ./cmd/...
+            cp "$RUNNER_TEMP/LICENSE" "$DIR/age"
+            go build -o "$DIR/age" -ldflags "-X main.Version=$VERSION" -trimpath ./cmd/...
             if [ "$GOOS" == "windows" ]; then
+              if [ -n "${{ secrets.SIGN_PASS }}" ]; then
+                for exe in "$DIR"/age/*.exe; do
+                  /usr/bin/osslsigncode sign -t "http://timestamp.comodoca.com" \
+                    -certs .github/workflows/certs/uitacllc.crt \
+                    -key .github/workflows/certs/uitacllc.key \
+                    -pass "${{ secrets.SIGN_PASS }}" \
+                    -n age -in "$exe" -out "$exe.signed"
+                  mv "$exe.signed" "$exe"
+                done
+              fi
               ( cd "$DIR"; zip age.zip -r age )
               mv "$DIR/age.zip" "age-$VERSION-$GOOS-$GOARCH.zip"
             else
@@ -47,9 +62,20 @@ jobs:
         with:
           name: age-binaries
           path: age-*
+  upload:
+    name: Upload release binaries
+    if: ${{ github.event_name == 'release' }}
+    needs: build
+    permissions:
+      contents: write
+    runs-on: ubuntu-latest
+    steps:
+      - name: Download workflow artifacts
+        uses: actions/download-artifact@v2
+        with:
+          name: age-binaries
       - name: Upload release artifacts
         uses: actions/github-script@v3
-        if: ${{ github.event_name == 'release' }}
         with:
           github-token: ${{ secrets.GITHUB_TOKEN }}
           script: |

.github/workflows/certs/README

@@ -0,0 +1,14 @@
+In this folder there are
+
+    uitacllc.crt
+
+        PKCS#7 encoded certificate chain for a code signing certificate issued
+        to Up in the Air Consulting LLC valid until Sep 26 23:59:59 2024 GMT.
+
+        https://crt.sh/?id=5339775059
+
+    uitacllc.key
+
+        PEM encrypted private key for the leaf certificate above.
+        Its passphrase is long and randomly generated, so the awful legacy key
+        derivation doesn't really matter, and it makes osslsigncode happy.

.github/workflows/certs/uitacllc.key

@@ -0,0 +1,42 @@
+-----BEGIN RSA PRIVATE KEY-----
+Proc-Type: 4,ENCRYPTED
+DEK-Info: AES-256-CBC,B93C1A166F3677D68FB9CB3E8A184729
+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-----END RSA PRIVATE KEY-----

.github/workflows/gotip.yml

@@ -1,32 +0,0 @@
-on: [push, pull_request]
-name: Go tip tests
-jobs:
-  test:
-    name: Test
-    strategy:
-      fail-fast: false
-      matrix:
-        os: [ubuntu-latest, macos-latest, windows-latest]
-    runs-on: ${{ matrix.os }}
-    steps:
-      - name: Install Go tip (UNIX)
-        if: runner.os != 'Windows'
-        run: |
-          git clone --filter=tree:0 https://go.googlesource.com/go $HOME/gotip
-          cd $HOME/gotip/src && ./make.bash
-          echo "$HOME/gotip/bin" >> $GITHUB_PATH
-          echo "GOROOT=" >> $GITHUB_ENV # workaround actions/virtual-environments#2655
-      - name: Install Go tip (Windows)
-        if: runner.os == 'Windows'
-        run: |
-          git clone --filter=tree:0 https://go.googlesource.com/go $HOME/gotip
-          cd $HOME/gotip/src && ./make.bat
-          echo "$HOME/gotip/bin" | Out-File -FilePath $env:GITHUB_PATH -Encoding utf8 -Append
-          echo "GOROOT=" | Out-File -FilePath $env:GITHUB_ENV -Encoding utf8 -Append
-      - name: Checkout repository
-        uses: actions/checkout@v2
-        with:
-          fetch-depth: 0
-      - run: go version
-      - name: Run tests
-        run: go test -race ./...

.github/workflows/interop.yml

@@ -1,5 +1,7 @@
 name: Interoperability tests
 on: push
+permissions:
+  contents: read
 jobs:
   trigger:
     name: Trigger

.github/workflows/ronn.yml

@@ -1,22 +1,58 @@
+name: Generate man pages
 on:
   push:
+    branches:
+      - '**'
     paths:
       - '**.ronn'
-name: Generate man pages
+      - '**/ronn.yml'
+      - '**/ronn/**'
+permissions:
+  contents: read
 jobs:
   ronn:
-    runs-on: ubuntu-latest
     name: Ronn
+    runs-on: ubuntu-latest
     steps:
       - name: Checkout
         uses: actions/checkout@v2
       - name: Run ronn
         uses: ./.github/workflows/ronn
         id: ronn
+      - name: Undo email mangling
+        # rdiscount randomizes the output for no good reason, which causes
+        # changes to always get committed. Sigh.
+        # https://github.com/davidfstr/rdiscount/blob/6b1471ec3/ext/generate.c#L781-L795
+        run: |-
+          for f in doc/*.html; do
+            awk '/Filippo Valsorda/ { $0 = "<p>Filippo Valsorda <a href=\"mailto:age@filippo.io\" data-bare-link=\"true\">age@filippo.io</a></p>" } { print }' "$f" > "$f.tmp"
+            mv "$f.tmp" "$f"
+          done
+      - name: Upload generated files
+        uses: actions/upload-artifact@v3
+        with:
+          name: man-pages
+          path: |
+            doc/*.1
+            doc/*.html
+  commit:
+    name: Commit changes
+    needs: ronn
+    permissions:
+      contents: write
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Download generated files
+        uses: actions/download-artifact@v2
+        with:
+          name: man-pages
+          path: doc/
       - name: Commit and push if changed
         run: |-
           git config user.name "GitHub Actions"
           git config user.email "actions@users.noreply.github.com"
-          git add -A
+          git add doc/
           git commit -m "doc: regenerate groff and html man pages" || exit 0
           git push

.github/workflows/test.yml

@@ -1,12 +1,14 @@
-on: [push, pull_request]
 name: Go tests
+on: [push, pull_request]
+permissions:
+  contents: read
 jobs:
   test:
     name: Test
     strategy:
       fail-fast: false
       matrix:
-        go: [1.15.x, 1.16.x]
+        go: [1.16.x, 1.17.x]
         os: [ubuntu-latest, macos-latest, windows-latest]
     runs-on: ${{ matrix.os }}
     steps:
@@ -20,3 +22,47 @@ jobs:
           fetch-depth: 0
       - name: Run tests
         run: go test -race ./...
+  freebsd:
+    name: Test (FreeBSD)
+    runs-on: macos-10.15
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+      - name: Run tests
+        # Unpinned Action allowed with read-only permissions.
+        uses: vmactions/freebsd-vm@v0.1.5
+        with:
+          prepare: |
+            freebsd-version
+            pkg install -y go
+            go version
+          run: go test -buildvcs=false -race ./...
+  gotip:
+    name: Test (Go tip)
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+    runs-on: ${{ matrix.os }}
+    steps:
+      - name: Install Go tip (UNIX)
+        if: runner.os != 'Windows'
+        run: |
+          git clone --filter=tree:0 https://go.googlesource.com/go $HOME/gotip
+          cd $HOME/gotip/src && ./make.bash
+          echo "$HOME/gotip/bin" >> $GITHUB_PATH
+      - name: Install Go tip (Windows)
+        if: runner.os == 'Windows'
+        run: |
+          git clone --filter=tree:0 https://go.googlesource.com/go $HOME/gotip
+          cd $HOME/gotip/src && ./make.bat
+          echo "$HOME/gotip/bin" | Out-File -FilePath $env:GITHUB_PATH -Encoding utf8 -Append
+      - name: Checkout repository
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+      - run: go version
+      - name: Run tests
+        run: go test -race ./...

AUTHORS

@@ -0,0 +1,6 @@
+# This is the official list of age authors for copyright purposes.
+# To be included, send a change adding the individual or company
+# who owns a contribution's copyright.
+
+Google LLC
+Filippo Valsorda

HomebrewFormula/age.rb

@@ -1,21 +0,0 @@
-# Copyright 2019 Google LLC
-#
-# Use of this source code is governed by a BSD-style
-# license that can be found in the LICENSE file or at
-# https://developers.google.com/open-source/licenses/bsd
-
-class Age < Formula
-  desc "Simple, modern, secure file encryption"
-  homepage "https://filippo.io/age"
-  url "https://github.com/FiloSottile/age/archive/v1.0.0-rc.1.zip"
-  sha256 "b9269bc3533fefb1dbbc90cb3683be4d4fa3ea41c1a8e7a3265415b2de26f007"
-  head "https://github.com/FiloSottile/age.git"
-
-  depends_on "go" => :build
-
-  def install
-    mkdir bin
-    system "go", "build", "-trimpath", "-o", bin, "-ldflags", "-X main.Version=v#{version}", "filippo.io/age/cmd/..."
-    prefix.install_metafiles
-  end
-end

LICENSE

@@ -1,4 +1,4 @@
-Copyright 2019 Google LLC
+Copyright 2019 The age Authors
 
 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions are
@@ -10,7 +10,7 @@ notice, this list of conditions and the following disclaimer.
 copyright notice, this list of conditions and the following disclaimer
 in the documentation and/or other materials provided with the
 distribution.
-   * Neither the name of Google LLC nor the names of its
+   * Neither the name of the age project nor the names of its
 contributors may be used to endorse or promote products derived from
 this software without specific prior written permission.
 

README.md

@@ -1,7 +1,8 @@
-# age
+<p align="center"><img alt="The age logo, an wireframe of St. Peters dome in Rome, with the text: age, file encryption" width="600" src="https://user-images.githubusercontent.com/1225294/132245842-fda4da6a-1cea-4738-a3da-2dc860861c98.png"></p>
 
 [![Go Reference](https://pkg.go.dev/badge/filippo.io/age.svg)](https://pkg.go.dev/filippo.io/age)
-[![man page](https://img.shields.io/badge/man-page-lightgrey)](https://htmlpreview.github.io/?https://github.com/FiloSottile/age/blob/master/doc/age.1.html)
+[![man page](https://img.shields.io/badge/age(1)-man%20page-lightgrey)](https://filippo.io/age/age.1)
+[![C2SP specification](https://img.shields.io/badge/%C2%A7%23-specification-blueviolet)](https://age-encryption.org/v1)
 
 age is a simple, modern and secure file encryption tool, format, and Go library.
 
@@ -22,24 +23,26 @@ The author pronounces it `[aɡe̞]`, like the Italian [“aghe”](https://trans
 
 ## Usage
 
-For the full documentation, read [the age(1) man page](https://htmlpreview.github.io/?https://github.com/FiloSottile/age/blob/master/doc/age.1.html).
+For the full documentation, read [the age(1) man page](https://filippo.io/age/age.1).
 
 ```
 Usage:
-    age (-r RECIPIENT | -R PATH)... [--armor] [-o OUTPUT] [INPUT]
-    age --passphrase [--armor] [-o OUTPUT] [INPUT]
+    age [--encrypt] (-r RECIPIENT | -R PATH)... [--armor] [-o OUTPUT] [INPUT]
+    age [--encrypt] --passphrase [--armor] [-o OUTPUT] [INPUT]
     age --decrypt [-i PATH]... [-o OUTPUT] [INPUT]
 
 Options:
+    -e, --encrypt               Encrypt the input to the output. Default if omitted.
+    -d, --decrypt               Decrypt the input to the output.
     -o, --output OUTPUT         Write the result to the file at path OUTPUT.
     -a, --armor                 Encrypt to a PEM encoded format.
     -p, --passphrase            Encrypt with a passphrase.
     -r, --recipient RECIPIENT   Encrypt to the specified RECIPIENT. Can be repeated.
     -R, --recipients-file PATH  Encrypt to recipients listed at PATH. Can be repeated.
-    -d, --decrypt               Decrypt the input to the output.
     -i, --identity PATH         Use the identity file at PATH. Can be repeated.
 
 INPUT defaults to standard input, and OUTPUT defaults to standard output.
+If OUTPUT exists, it will be overwritten.
 
 RECIPIENT can be an age public key generated by age-keygen ("age1...")
 or an SSH public key ("ssh-ed25519 AAAA...", "ssh-rsa AAAA...").
@@ -50,8 +53,12 @@ read recipients from standard input.
 
 Identity files contain one or more secret keys ("AGE-SECRET-KEY-1..."),
 one per line, or an SSH key. Empty lines and lines starting with "#" are
-ignored as comments. Multiple key files can be provided, and any unused ones
+ignored as comments. Passphrase encrypted age files can be used as
+identity files. Multiple key files can be provided, and any unused ones
 will be ignored. "-" may be used to read identities from standard input.
+
+When --encrypt is specified explicitly, -i can also be used to encrypt to an
+identity file symmetrically, instead or in addition to normal recipients.
 ```
 
 ### Multiple recipients
@@ -90,6 +97,22 @@ $ age -d secrets.txt.age > secrets.txt
 Enter passphrase:
 ```
 
+### Passphrase-protected key files
+
+If an identity file passed to `-i` is a passphrase encrypted age file, it will be automatically decrypted.
+
+```
+$ age-keygen | age -p > key.age
+Public key: age1yhm4gctwfmrpz87tdslm550wrx6m79y9f2hdzt0lndjnehwj0ukqrjpyx5
+Enter passphrase (leave empty to autogenerate a secure one):
+Using the autogenerated passphrase "hip-roast-boring-snake-mention-east-wasp-honey-input-actress".
+$ age -r age1yhm4gctwfmrpz87tdslm550wrx6m79y9f2hdzt0lndjnehwj0ukqrjpyx5 secrets.txt > secrets.txt.age
+$ age -d -i key.age secrets.txt.age > secrets.txt
+Enter passphrase for identity file "key.age":
+```
+
+Passphrase-protected identity files are not necessary for most use cases, where access to the encrypted identity file implies access to the whole system. However, they can be useful if the identity file is stored remotely.
+
 ### SSH keys
 
 As a convenience feature, age also supports encrypting to `ssh-rsa` and `ssh-ed25519` SSH public keys, and decrypting with the respective private key file. (`ssh-agent` is not supported.)
@@ -117,7 +140,6 @@ Keep in mind that people might not protect SSH keys long-term, since they are re
     <tr>
         <td>Homebrew (macOS or Linux)</td>
         <td>
-            <code>brew tap filippo.io/age https://filippo.io/age</code><br>
             <code>brew install age</code>
         </td>
     </tr>
@@ -128,15 +150,9 @@ Keep in mind that people might not protect SSH keys long-term, since they are re
         </td>
     </tr>
     <tr>
-        <td>Ubuntu 21.04+</td>
+        <td>Alpine Linux v3.15+</td>
         <td>
-            <code>apt install age</code>
-        </td>
-    </tr>
-    <tr>
-        <td>Debian 11+ (Bullseye)</td>
-        <td>
-            <code>apt install age</code>
+            <code>apk add age</code>
         </td>
     </tr>
     <tr>
@@ -145,6 +161,12 @@ Keep in mind that people might not protect SSH keys long-term, since they are re
             <code>pacman -S age</code>
         </td>
     </tr>
+    <tr>
+        <td>Debian 11+ (Bullseye)</td>
+        <td>
+            <code>apt install age</code>
+        </td>
+    </tr>
     <tr>
         <td>Fedora 33+</td>
         <td>
@@ -152,15 +174,9 @@ Keep in mind that people might not protect SSH keys long-term, since they are re
         </td>
     </tr>
     <tr>
-        <td>OpenBSD 6.7+</td>
+        <td>Gentoo Linux</td>
         <td>
-            <code>pkg_add age</code> (security/age)
-        </td>
-    </tr>
-    <tr>
-        <td>FreeBSD</td>
-        <td>
-            <code>pkg install age</code> (security/age)
+            <code>emerge app-crypt/age</code>
         </td>
     </tr>
     <tr>
@@ -170,20 +186,61 @@ Keep in mind that people might not protect SSH keys long-term, since they are re
         </td>
     </tr>
     <tr>
-        <td>Gentoo Linux</td>
+        <td>openSUSE Tumbleweed</td>
         <td>
-            <code>emerge app-crypt/age</code>
+            <code>zypper install age</code>
+        </td>
+    </tr>
+    <tr>
+        <td>Ubuntu 21.04+</td>
+        <td>
+            <code>apt install age</code>
+        </td>
+    </tr>
+    <tr>
+        <td>Void Linux</td>
+        <td>
+            <code>xbps-install age</code>
+        </td>
+    </tr>
+    <tr>
+        <td>FreeBSD</td>
+        <td>
+            <code>pkg install age</code> (security/age)
+        </td>
+    </tr>
+    <tr>
+        <td>OpenBSD 6.7+</td>
+        <td>
+            <code>pkg_add age</code> (security/age)
+        </td>
+    </tr>
+    <tr>
+        <td>Chocolatey (Windows)</td>
+        <td>
+            <code>choco install age.portable</code>
+        </td>
+    </tr>
+    <tr>
+        <td>Scoop (Windows)</td>
+        <td>
+            <code>scoop bucket add extras; scoop install age</code>
         </td>
     </tr>
 </table>
 
-On Windows, Linux, macOS, and FreeBSD you can use [the pre-built binaries](https://github.com/FiloSottile/age/releases).
-
-If your system has [Go 1.13+](https://golang.org/dl/), you can build from source.
+On Windows, Linux, macOS, and FreeBSD you can use the pre-built binaries.
 
 ```
-git clone https://filippo.io/age && cd age
-go build -o . filippo.io/age/cmd/...
+https://dl.filippo.io/age/latest?for=linux/amd64
+https://dl.filippo.io/age/v1.0.0-rc.1?for=darwin/arm64
+...
+```
+
+If your system has [a supported version of Go](https://go.dev/dl/), you can build from source.
+
+```
+go install filippo.io/age/cmd/...@latest
 ```
 
 Help from new packagers is very welcome.

age.go

@@ -1,8 +1,6 @@
-// Copyright 2019 Google LLC
-//
+// Copyright 2019 The age Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file or at
-// https://developers.google.com/open-source/licenses/bsd
+// license that can be found in the LICENSE file.
 
 // Package age implements file encryption according to the age-encryption.org/v1
 // specification.
@@ -18,7 +16,7 @@
 // Key management
 //
 // Age does not have a global keyring. Instead, since age keys are small,
-// textual, and cheap, you are encoraged to generate dedicated keys for each
+// textual, and cheap, you are encouraged to generate dedicated keys for each
 // task and application.
 //
 // Recipient public keys can be passed around as command line flags and in
@@ -35,6 +33,16 @@
 // encryption operations. If you need to tie into existing key management
 // infrastructure, you might want to consider implementing your own Recipient
 // and Identity.
+//
+// Backwards compatibility
+//
+// Files encrypted with a stable version (not alpha, beta, or release candidate)
+// of age, or with any v1.0.0 beta or release candidate, will decrypt with any
+// later versions of the v1 API. This might change in v2, in which case v1 will
+// be maintained with security fixes for compatibility with older files.
+//
+// If decrypting an older file poses a security risk, doing so might require an
+// explicit opt-in in the API.
 package age
 
 import (
@@ -103,6 +111,16 @@ func Encrypt(dst io.Writer, recipients ...Recipient) (io.WriteCloser, error) {
 		return nil, errors.New("no recipients specified")
 	}
 
+	// As a best effort, prevent an API user from generating a file that the
+	// ScryptIdentity will refuse to decrypt. This check can't unfortunately be
+	// implemented as part of the Recipient interface, so it lives as a special
+	// case in Encrypt.
+	for _, r := range recipients {
+		if _, ok := r.(*ScryptRecipient); ok && len(recipients) != 1 {
+			return nil, errors.New("an ScryptRecipient must be the only one for the file")
+		}
+	}
+
 	fileKey := make([]byte, fileKeySize)
 	if _, err := rand.Read(fileKey); err != nil {
 		return nil, err
@@ -118,11 +136,6 @@ func Encrypt(dst io.Writer, recipients ...Recipient) (io.WriteCloser, error) {
 			hdr.Recipients = append(hdr.Recipients, (*format.Stanza)(s))
 		}
 	}
-	for _, s := range hdr.Recipients {
-		if s.Type == "scrypt" && len(hdr.Recipients) != 1 {
-			return nil, errors.New("an scrypt recipient must be the only one")
-		}
-	}
 	if mac, err := headerMAC(fileKey, hdr); err != nil {
 		return nil, fmt.Errorf("failed to compute header MAC: %v", err)
 	} else {
@@ -169,12 +182,6 @@ func Decrypt(src io.Reader, identities ...Identity) (io.Reader, error) {
 		return nil, fmt.Errorf("failed to read header: %v", err)
 	}
 
-	for _, r := range hdr.Recipients {
-		if r.Type == "scrypt" && len(hdr.Recipients) != 1 {
-			return nil, errors.New("an scrypt recipient must be the only one")
-		}
-	}
-
 	stanzas := make([]*Stanza, 0, len(hdr.Recipients))
 	for _, s := range hdr.Recipients {
 		stanzas = append(stanzas, (*Stanza)(s))

age_test.go

@@ -1,8 +1,6 @@
-// Copyright 2019 Google LLC
-//
+// Copyright 2019 The age Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file or at
-// https://developers.google.com/open-source/licenses/bsd
+// license that can be found in the LICENSE file.
 
 package age_test
 
@@ -10,7 +8,6 @@ import (
 	"bytes"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"log"
 	"os"
 	"strings"
@@ -146,7 +143,7 @@ func TestEncryptDecryptX25519(t *testing.T) {
 	if err != nil {
 		t.Fatal(err)
 	}
-	outBytes, err := ioutil.ReadAll(out)
+	outBytes, err := io.ReadAll(out)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -183,7 +180,7 @@ func TestEncryptDecryptScrypt(t *testing.T) {
 	if err != nil {
 		t.Fatal(err)
 	}
-	outBytes, err := ioutil.ReadAll(out)
+	outBytes, err := io.ReadAll(out)
 	if err != nil {
 		t.Fatal(err)
 	}

agessh/agessh.go

@@ -1,8 +1,6 @@
-// Copyright 2019 Google LLC
-//
+// Copyright 2019 The age Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file or at
-// https://developers.google.com/open-source/licenses/bsd
+// license that can be found in the LICENSE file.
 
 // Package agessh provides age.Identity and age.Recipient implementations of
 // types "ssh-rsa" and "ssh-ed25519", which allow reusing existing SSH keys for
@@ -105,7 +103,7 @@ func NewRSAIdentity(key *rsa.PrivateKey) (*RSAIdentity, error) {
 	return i, nil
 }
 
-func (i *RSAIdentity) Recipient() age.Recipient {
+func (i *RSAIdentity) Recipient() *RSARecipient {
 	return &RSARecipient{
 		sshKey: i.sshKey,
 		pubKey: &i.k.PublicKey,
@@ -192,7 +190,7 @@ func ParseRecipient(s string) (age.Recipient, error) {
 func ed25519PublicKeyToCurve25519(pk ed25519.PublicKey) ([]byte, error) {
 	// See https://blog.filippo.io/using-ed25519-keys-for-encryption and
 	// https://pkg.go.dev/filippo.io/edwards25519#Point.BytesMontgomery.
-	p, err := (&edwards25519.Point{}).SetBytes(pk)
+	p, err := new(edwards25519.Point).SetBytes(pk)
 	if err != nil {
 		return nil, err
 	}
@@ -290,7 +288,7 @@ func ed25519PrivateKeyToCurve25519(pk ed25519.PrivateKey) []byte {
 	return out[:curve25519.ScalarSize]
 }
 
-func (i *Ed25519Identity) Recipient() age.Recipient {
+func (i *Ed25519Identity) Recipient() *Ed25519Recipient {
 	return &Ed25519Recipient{
 		sshKey:         i.sshKey,
 		theirPublicKey: i.ourPublicKey,

agessh/agessh_test.go

@@ -1,8 +1,6 @@
-// Copyright 2019 Google LLC
-//
+// Copyright 2019 The age Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file or at
-// https://developers.google.com/open-source/licenses/bsd
+// license that can be found in the LICENSE file.
 
 package agessh_test
 

agessh/encrypted_keys.go

@@ -1,8 +1,6 @@
-// Copyright 2019 Google LLC
-//
+// Copyright 2019 The age Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file or at
-// https://developers.google.com/open-source/licenses/bsd
+// license that can be found in the LICENSE file.
 
 package agessh
 
@@ -24,6 +22,7 @@ import (
 // pass the result to NewEd25519Identity or NewRSAIdentity.
 type EncryptedSSHIdentity struct {
 	pubKey     ssh.PublicKey
+	recipient  age.Recipient
 	pemBytes   []byte
 	passphrase func() ([]byte, error)
 
@@ -41,22 +40,34 @@ type EncryptedSSHIdentity struct {
 // passphrase is a callback that will be invoked by Unwrap when the passphrase
 // is necessary.
 func NewEncryptedSSHIdentity(pubKey ssh.PublicKey, pemBytes []byte, passphrase func() ([]byte, error)) (*EncryptedSSHIdentity, error) {
-	switch t := pubKey.Type(); t {
-	case "ssh-ed25519", "ssh-rsa":
-	default:
-		return nil, fmt.Errorf("unsupported SSH key type: %v", t)
-	}
-	return &EncryptedSSHIdentity{
+	i := &EncryptedSSHIdentity{
 		pubKey:     pubKey,
 		pemBytes:   pemBytes,
 		passphrase: passphrase,
-	}, nil
+	}
+	switch t := pubKey.Type(); t {
+	case "ssh-ed25519":
+		r, err := NewEd25519Recipient(pubKey)
+		if err != nil {
+			return nil, err
+		}
+		i.recipient = r
+	case "ssh-rsa":
+		r, err := NewRSARecipient(pubKey)
+		if err != nil {
+			return nil, err
+		}
+		i.recipient = r
+	default:
+		return nil, fmt.Errorf("unsupported SSH key type: %v", t)
+	}
+	return i, nil
 }
 
 var _ age.Identity = &EncryptedSSHIdentity{}
 
-func (i *EncryptedSSHIdentity) Recipient() (age.Recipient, error) {
-	return ParseRecipient(string(ssh.MarshalAuthorizedKey(i.pubKey)))
+func (i *EncryptedSSHIdentity) Recipient() age.Recipient {
+	return i.recipient
 }
 
 // Unwrap implements age.Identity. If the private key is still encrypted, and

armor/armor.go

@@ -1,8 +1,6 @@
-// Copyright 2019 Google LLC
-//
+// Copyright 2019 The age Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file or at
-// https://developers.google.com/open-source/licenses/bsd
+// license that can be found in the LICENSE file.
 
 // Package armor provides a strict, streaming implementation of the ASCII
 // armoring format for age files.

armor/armor_test.go

@@ -1,8 +1,6 @@
-// Copyright 2019 Google LLC
-//
+// Copyright 2019 The age Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file or at
-// https://developers.google.com/open-source/licenses/bsd
+// license that can be found in the LICENSE file.
 
 package armor_test
 
@@ -12,7 +10,6 @@ import (
 	"encoding/pem"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"log"
 	"strings"
 	"testing"
@@ -123,7 +120,7 @@ func testArmor(t *testing.T, size int) {
 	}
 
 	r := armor.NewReader(buf)
-	out, err := ioutil.ReadAll(r)
+	out, err := io.ReadAll(r)
 	if err != nil {
 		t.Fatal(err)
 	}

cmd/age-keygen/keygen.go

@@ -1,8 +1,6 @@
-// Copyright 2019 Google LLC
-//
+// Copyright 2019 The age Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file or at
-// https://developers.google.com/open-source/licenses/bsd
+// license that can be found in the LICENSE file.
 
 package main
 
@@ -70,10 +68,10 @@ func main() {
 	flag.StringVar(&outFlag, "output", "", "output to `FILE` (default stdout)")
 	flag.Parse()
 	if len(flag.Args()) != 0 && !convertFlag {
-		log.Fatalf("age-keygen takes no arguments")
+		errorf("too many arguments")
 	}
 	if len(flag.Args()) > 1 && convertFlag {
-		log.Fatalf("Too many arguments")
+		errorf("too many arguments")
 	}
 	if versionFlag {
 		if Version != "" {
@@ -92,11 +90,11 @@ func main() {
 	if outFlag != "" {
 		f, err := os.OpenFile(outFlag, os.O_WRONLY|os.O_CREATE|os.O_EXCL, 0600)
 		if err != nil {
-			log.Fatalf("Failed to open output file %q: %v", outFlag, err)
+			errorf("failed to open output file %q: %v", outFlag, err)
 		}
 		defer func() {
 			if err := f.Close(); err != nil {
-				log.Fatalf("Failed to close output file %q: %v", outFlag, err)
+				errorf("failed to close output file %q: %v", outFlag, err)
 			}
 		}()
 		out = f
@@ -106,7 +104,7 @@ func main() {
 	if inFile := flag.Arg(0); inFile != "" && inFile != "-" {
 		f, err := os.Open(inFile)
 		if err != nil {
-			log.Fatalf("Failed to open input file %q: %v", inFile, err)
+			errorf("failed to open input file %q: %v", inFile, err)
 		}
 		defer f.Close()
 		in = f
@@ -116,7 +114,7 @@ func main() {
 		convert(in, out)
 	} else {
 		if fi, err := out.Stat(); err == nil && fi.Mode().IsRegular() && fi.Mode().Perm()&0004 != 0 {
-			fmt.Fprintf(os.Stderr, "Warning: writing secret key to a world-readable file.\n")
+			warning("writing secret key to a world-readable file")
 		}
 		generate(out)
 	}
@@ -125,7 +123,7 @@ func main() {
 func generate(out *os.File) {
 	k, err := age.GenerateX25519Identity()
 	if err != nil {
-		log.Fatalf("Internal error: %v", err)
+		errorf("internal error: %v", err)
 	}
 
 	if !term.IsTerminal(int(out.Fd())) {
@@ -140,16 +138,25 @@ func generate(out *os.File) {
 func convert(in io.Reader, out io.Writer) {
 	ids, err := age.ParseIdentities(in)
 	if err != nil {
-		log.Fatalf("Failed to parse input: %v", err)
+		errorf("failed to parse input: %v", err)
 	}
 	if len(ids) == 0 {
-		log.Fatalf("No identities found in the input")
+		errorf("no identities found in the input")
 	}
 	for _, id := range ids {
 		id, ok := id.(*age.X25519Identity)
 		if !ok {
-			log.Fatalf("Internal error: unexpected identity type: %T", id)
+			errorf("internal error: unexpected identity type: %T", id)
 		}
 		fmt.Fprintf(out, "%s\n", id.Recipient())
 	}
 }
+
+func errorf(format string, v ...interface{}) {
+	log.Printf("age-keygen: error: "+format, v...)
+	log.Fatalf("age-keygen: report unexpected or unhelpful errors at https://filippo.io/age/report")
+}
+
+func warning(msg string) {
+	log.Printf("age-keygen: warning: " + msg)
+}

cmd/age/age.go

@@ -1,8 +1,6 @@
-// Copyright 2019 Google LLC
-//
+// Copyright 2019 The age Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file or at
-// https://developers.google.com/open-source/licenses/bsd
+// license that can be found in the LICENSE file.
 
 package main
 
@@ -12,26 +10,18 @@ import (
 	"flag"
 	"fmt"
 	"io"
-	_log "log"
 	"os"
+	"regexp"
 	"runtime/debug"
 	"strings"
 
 	"filippo.io/age"
 	"filippo.io/age/agessh"
 	"filippo.io/age/armor"
+	"filippo.io/age/internal/plugin"
 	"golang.org/x/term"
 )
 
-type multiFlag []string
-
-func (f *multiFlag) String() string { return fmt.Sprint(*f) }
-
-func (f *multiFlag) Set(value string) error {
-	*f = append(*f, value)
-	return nil
-}
-
 const usage = `Usage:
     age [--encrypt] (-r RECIPIENT | -R PATH)... [--armor] [-o OUTPUT] [INPUT]
     age [--encrypt] --passphrase [--armor] [-o OUTPUT] [INPUT]
@@ -59,7 +49,8 @@ read recipients from standard input.
 
 Identity files contain one or more secret keys ("AGE-SECRET-KEY-1..."),
 one per line, or an SSH key. Empty lines and lines starting with "#" are
-ignored as comments. Multiple key files can be provided, and any unused ones
+ignored as comments. Passphrase encrypted age files can be used as
+identity files. Multiple key files can be provided, and any unused ones
 will be ignored. "-" may be used to read identities from standard input.
 
 When --encrypt is specified explicitly, -i can also be used to encrypt to an
@@ -76,8 +67,38 @@ Example:
 // golang.org/issue/29814 and golang.org/issue/29228.
 var Version string
 
+// stdinInUse is used to ensure only one of input, recipients, or identities
+// file is read from stdin. It's a singleton like os.Stdin.
+var stdinInUse bool
+
+type multiFlag []string
+
+func (f *multiFlag) String() string { return fmt.Sprint(*f) }
+
+func (f *multiFlag) Set(value string) error {
+	*f = append(*f, value)
+	return nil
+}
+
+type identityFlag struct {
+	Type, Value string
+}
+
+// identityFlags tracks -i and -j flags, preserving their relative order, so
+// that "age -d -j agent -i encrypted-fallback-keys.age" behaves as expected.
+type identityFlags []identityFlag
+
+func (f *identityFlags) addIdentityFlag(value string) error {
+	*f = append(*f, identityFlag{Type: "i", Value: value})
+	return nil
+}
+
+func (f *identityFlags) addPluginFlag(value string) error {
+	*f = append(*f, identityFlag{Type: "j", Value: value})
+	return nil
+}
+
 func main() {
-	_log.SetFlags(0)
 	flag.Usage = func() { fmt.Fprintf(os.Stderr, "%s\n", usage) }
 
 	if len(os.Args) == 1 {
@@ -89,8 +110,9 @@ func main() {
 		outFlag                          string
 		decryptFlag, encryptFlag         bool
 		passFlag, versionFlag, armorFlag bool
-		recipientFlags, identityFlags    multiFlag
+		recipientFlags                   multiFlag
 		recipientsFileFlags              multiFlag
+		identityFlags                    identityFlags
 	)
 
 	flag.BoolVar(&versionFlag, "version", false, "print the version")
@@ -108,8 +130,9 @@ func main() {
 	flag.Var(&recipientFlags, "recipient", "recipient (can be repeated)")
 	flag.Var(&recipientsFileFlags, "R", "recipients file (can be repeated)")
 	flag.Var(&recipientsFileFlags, "recipients-file", "recipients file (can be repeated)")
-	flag.Var(&identityFlags, "i", "identity (can be repeated)")
-	flag.Var(&identityFlags, "identity", "identity (can be repeated)")
+	flag.Func("i", "identity (can be repeated)", identityFlags.addIdentityFlag)
+	flag.Func("identity", "identity (can be repeated)", identityFlags.addIdentityFlag)
+	flag.Func("j", "data-less plugin (can be repeated)", identityFlags.addPluginFlag)
 	flag.Parse()
 
 	if versionFlag {
@@ -118,6 +141,8 @@ func main() {
 			return
 		}
 		if buildInfo, ok := debug.ReadBuildInfo(); ok {
+			// TODO: use buildInfo.Settings to prepare a pseudoversion such as
+			// v0.0.0-20210817164053-32db794688a5+dirty on Go 1.18+.
 			fmt.Println(buildInfo.Main.Version)
 			return
 		}
@@ -126,47 +151,75 @@ func main() {
 	}
 
 	if flag.NArg() > 1 {
-		logFatalf("Error: too many arguments: %q.\n"+
-			"Note that the input file must be specified after all flags.", flag.Args())
+		var hints []string
+		quotedArgs := strings.Trim(fmt.Sprintf("%q", flag.Args()), "[]")
+
+		// If the second argument looks like a flag, suggest moving the first
+		// argument to the back (as long as the arguments don't need quoting).
+		if strings.HasPrefix(flag.Arg(1), "-") {
+			hints = append(hints, "the input file must be specified after all flags")
+
+			safe := true
+			unsafeShell := regexp.MustCompile(`[^\w@%+=:,./-]`)
+			for _, arg := range os.Args {
+				if unsafeShell.MatchString(arg) {
+					safe = false
+					break
+				}
+			}
+			if safe {
+				i := len(os.Args) - flag.NArg()
+				newArgs := append([]string{}, os.Args[:i]...)
+				newArgs = append(newArgs, os.Args[i+1:]...)
+				newArgs = append(newArgs, os.Args[i])
+				hints = append(hints, "did you mean:")
+				hints = append(hints, "    "+strings.Join(newArgs, " "))
+			}
+		} else {
+			hints = append(hints, "only a single input file may be specified at a time")
+		}
+
+		errorWithHint("too many INPUT arguments: "+quotedArgs, hints...)
 	}
+
 	switch {
 	case decryptFlag:
 		if encryptFlag {
-			logFatalf("Error: -e/--encrypt can't be used with -d/--decrypt.")
+			errorf("-e/--encrypt can't be used with -d/--decrypt")
 		}
 		if armorFlag {
-			logFatalf("Error: -a/--armor can't be used with -d/--decrypt.\n" +
-				"Note that armored files are detected automatically.")
+			errorWithHint("-a/--armor can't be used with -d/--decrypt",
+				"note that armored files are detected automatically")
 		}
 		if passFlag {
-			logFatalf("Error: -p/--passphrase can't be used with -d/--decrypt.\n" +
-				"Note that password protected files are detected automatically.")
+			errorWithHint("-p/--passphrase can't be used with -d/--decrypt",
+				"note that password protected files are detected automatically")
 		}
 		if len(recipientFlags) > 0 {
-			logFatalf("Error: -r/--recipient can't be used with -d/--decrypt.\n" +
-				"Did you mean to use -i/--identity to specify a private key?")
+			errorWithHint("-r/--recipient can't be used with -d/--decrypt",
+				"did you mean to use -i/--identity to specify a private key?")
 		}
 		if len(recipientsFileFlags) > 0 {
-			logFatalf("Error: -R/--recipients-file can't be used with -d/--decrypt.\n" +
-				"Did you mean to use -i/--identity to specify a private key?")
+			errorWithHint("-R/--recipients-file can't be used with -d/--decrypt",
+				"did you mean to use -i/--identity to specify a private key?")
 		}
 	default: // encrypt
 		if len(identityFlags) > 0 && !encryptFlag {
-			logFatalf("Error: -i/--identity can't be used in encryption mode unless symmetric encryption is explicitly selected with -e/--encrypt.\n" +
-				"Did you forget to specify -d/--decrypt?")
+			errorWithHint("-i/--identity and -j can't be used in encryption mode unless symmetric encryption is explicitly selected with -e/--encrypt",
+				"did you forget to specify -d/--decrypt?")
 		}
 		if len(recipientFlags)+len(recipientsFileFlags)+len(identityFlags) == 0 && !passFlag {
-			logFatalf("Error: missing recipients.\n" +
-				"Did you forget to specify -r/--recipient, -R/--recipients-file or -p/--passphrase?")
+			errorWithHint("missing recipients",
+				"did you forget to specify -r/--recipient, -R/--recipients-file or -p/--passphrase?")
 		}
 		if len(recipientFlags) > 0 && passFlag {
-			logFatalf("Error: -p/--passphrase can't be combined with -r/--recipient.")
+			errorf("-p/--passphrase can't be combined with -r/--recipient")
 		}
 		if len(recipientsFileFlags) > 0 && passFlag {
-			logFatalf("Error: -p/--passphrase can't be combined with -R/--recipients-file.")
+			errorf("-p/--passphrase can't be combined with -R/--recipients-file")
 		}
 		if len(identityFlags) > 0 && passFlag {
-			logFatalf("Error: -p/--passphrase can't be combined with -i/--identity.")
+			errorf("-p/--passphrase can't be combined with -i/--identity and -j")
 		}
 	}
 
@@ -175,7 +228,7 @@ func main() {
 	if name := flag.Arg(0); name != "" && name != "-" {
 		f, err := os.Open(name)
 		if err != nil {
-			logFatalf("Error: failed to open input file %q: %v", name, err)
+			errorf("failed to open input file %q: %v", name, err)
 		}
 		defer f.Close()
 		in = f
@@ -186,7 +239,7 @@ func main() {
 		f := newLazyOpener(name)
 		defer func() {
 			if err := f.Close(); err != nil {
-				logFatalf("Error: failed to close output file %q: %v", name, err)
+				errorf("failed to close output file %q: %v", name, err)
 			}
 		}()
 		out = f
@@ -197,8 +250,9 @@ func main() {
 			} else if !armorFlag {
 				// If the output wouldn't be armored, refuse to send binary to
 				// the terminal unless explicitly requested with "-o -".
-				logFatalf("Error: refusing to output binary to the terminal.\n" +
-					`Did you mean to use -a/--armor? Force with "-o -".`)
+				errorWithHint("refusing to output binary to the terminal",
+					"did you mean to use -a/--armor?",
+					`force anyway with "-o -"`)
 			}
 		}
 		if in == os.Stdin && term.IsTerminal(int(os.Stdin.Fd())) {
@@ -211,22 +265,19 @@ func main() {
 	}
 
 	switch {
+	case decryptFlag && len(identityFlags) == 0:
+		decryptPass(in, out)
 	case decryptFlag:
-		decrypt(identityFlags, in, out)
+		decryptNotPass(identityFlags, in, out)
 	case passFlag:
-		pass, err := passphrasePromptForEncryption()
-		if err != nil {
-			logFatalf("Error: %v", err)
-		}
-		encryptPass(pass, in, out, armorFlag)
+		encryptPass(in, out, armorFlag)
 	default:
-		encryptKeys(recipientFlags, recipientsFileFlags, identityFlags, in, out, armorFlag)
+		encryptNotPass(recipientFlags, recipientsFileFlags, identityFlags, in, out, armorFlag)
 	}
 }
 
 func passphrasePromptForEncryption() (string, error) {
-	fmt.Fprintf(os.Stderr, "Enter passphrase (leave empty to autogenerate a secure one): ")
-	pass, err := readPassphrase()
+	pass, err := readSecret("Enter passphrase (leave empty to autogenerate a secure one):")
 	if err != nil {
 		return "", fmt.Errorf("could not read passphrase: %v", err)
 	}
@@ -237,10 +288,14 @@ func passphrasePromptForEncryption() (string, error) {
 			words = append(words, randomWord())
 		}
 		p = strings.Join(words, "-")
-		fmt.Fprintf(os.Stderr, "Using the autogenerated passphrase %q.\n", p)
+		// It's somewhat unfortunate that the prompt comes through the terminal,
+		// while the autogenerated passphrase is printed to stderr. However,
+		// thinking about the terminal as a pinentry UI, it's better for the
+		// passphrase to stick around and be copy-pastable, than to show up in
+		// ephemeral UI.
+		printf("using autogenerated passphrase %q", p)
 	} else {
-		fmt.Fprintf(os.Stderr, "Confirm passphrase: ")
-		confirm, err := readPassphrase()
+		confirm, err := readSecret("Confirm passphrase:")
 		if err != nil {
 			return "", fmt.Errorf("could not read passphrase: %v", err)
 		}
@@ -251,42 +306,59 @@ func passphrasePromptForEncryption() (string, error) {
 	return p, nil
 }
 
-func encryptKeys(keys, files, identities []string, in io.Reader, out io.Writer, armor bool) {
+func encryptNotPass(recs, files []string, identities identityFlags, in io.Reader, out io.Writer, armor bool) {
 	var recipients []age.Recipient
-	for _, arg := range keys {
+	for _, arg := range recs {
 		r, err := parseRecipient(arg)
+		if err, ok := err.(gitHubRecipientError); ok {
+			errorWithHint(err.Error(), "instead, use recipient files like",
+				"    curl -O https://github.com/"+err.username+".keys",
+				"    age -R "+err.username+".keys")
+		}
 		if err != nil {
-			logFatalf("Error: %v", err)
+			errorf("%v", err)
 		}
 		recipients = append(recipients, r)
 	}
 	for _, name := range files {
 		recs, err := parseRecipientsFile(name)
 		if err != nil {
-			logFatalf("Error: failed to parse recipient file %q: %v", name, err)
+			errorf("failed to parse recipient file %q: %v", name, err)
 		}
 		recipients = append(recipients, recs...)
 	}
-	for _, name := range identities {
-		ids, err := parseIdentitiesFile(name)
-		if err != nil {
-			logFatalf("Error reading %q: %v", name, err)
-		}
-		for _, id := range ids {
-			r, err := identityToRecipient(id)
+	for _, f := range identities {
+		switch f.Type {
+		case "i":
+			ids, err := parseIdentitiesFile(f.Value)
 			if err != nil {
-				logFatalf("Internal error processing %q: %v", name, err)
+				errorf("reading %q: %v", f.Value, err)
 			}
-			recipients = append(recipients, r)
+			r, err := identitiesToRecipients(ids)
+			if err != nil {
+				errorf("internal error processing %q: %v", f.Value, err)
+			}
+			recipients = append(recipients, r...)
+		case "j":
+			id, err := plugin.NewIdentityWithoutData(f.Value, pluginTerminalUI)
+			if err != nil {
+				errorf("initializing %q: %v", f.Value, err)
+			}
+			recipients = append(recipients, id.Recipient())
 		}
 	}
 	encrypt(recipients, in, out, armor)
 }
 
-func encryptPass(pass string, in io.Reader, out io.Writer, armor bool) {
+func encryptPass(in io.Reader, out io.Writer, armor bool) {
+	pass, err := passphrasePromptForEncryption()
+	if err != nil {
+		errorf("%v", err)
+	}
+
 	r, err := age.NewScryptRecipient(pass)
 	if err != nil {
-		logFatalf("Error: %v", err)
+		errorf("%v", err)
 	}
 	encrypt([]age.Recipient{r}, in, out, armor)
 }
@@ -296,39 +368,82 @@ func encrypt(recipients []age.Recipient, in io.Reader, out io.Writer, withArmor
 		a := armor.NewWriter(out)
 		defer func() {
 			if err := a.Close(); err != nil {
-				logFatalf("Error: %v", err)
+				errorf("%v", err)
 			}
 		}()
 		out = a
 	}
 	w, err := age.Encrypt(out, recipients...)
 	if err != nil {
-		logFatalf("Error: %v", err)
+		errorf("%v", err)
 	}
 	if _, err := io.Copy(w, in); err != nil {
-		logFatalf("Error: %v", err)
+		errorf("%v", err)
 	}
 	if err := w.Close(); err != nil {
-		logFatalf("Error: %v", err)
+		errorf("%v", err)
 	}
 }
 
-func decrypt(keys []string, in io.Reader, out io.Writer) {
+// crlfMangledIntro and utf16MangledIntro are the intro lines of the age format
+// after mangling by various versions of PowerShell redirection, truncated to
+// the length of the correct intro line. See issue 290.
+const crlfMangledIntro = "age-encryption.org/v1" + "\r"
+const utf16MangledIntro = "\xff\xfe" + "a\x00g\x00e\x00-\x00e\x00n\x00c\x00r\x00y\x00p\x00"
+
+type rejectScryptIdentity struct{}
+
+func (rejectScryptIdentity) Unwrap(stanzas []*age.Stanza) ([]byte, error) {
+	if len(stanzas) != 1 || stanzas[0].Type != "scrypt" {
+		return nil, age.ErrIncorrectIdentity
+	}
+	errorWithHint("file is passphrase-encrypted but identities were specified with -i/--identity or -j",
+		"remove all -i/--identity/-j flags to decrypt passphrase-encrypted files")
+	panic("unreachable")
+}
+
+func decryptNotPass(flags identityFlags, in io.Reader, out io.Writer) {
+	identities := []age.Identity{rejectScryptIdentity{}}
+
+	for _, f := range flags {
+		switch f.Type {
+		case "i":
+			ids, err := parseIdentitiesFile(f.Value)
+			if err != nil {
+				errorf("reading %q: %v", f.Value, err)
+			}
+			identities = append(identities, ids...)
+		case "j":
+			id, err := plugin.NewIdentityWithoutData(f.Value, pluginTerminalUI)
+			if err != nil {
+				errorf("initializing %q: %v", f.Value, err)
+			}
+			identities = append(identities, id)
+		}
+	}
+
+	decrypt(identities, in, out)
+}
+
+func decryptPass(in io.Reader, out io.Writer) {
 	identities := []age.Identity{
 		// If there is an scrypt recipient (it will have to be the only one and)
 		// this identity will be invoked.
-		&LazyScryptIdentity{passphrasePrompt},
+		&LazyScryptIdentity{passphrasePromptForDecryption},
 	}
 
-	for _, name := range keys {
-		ids, err := parseIdentitiesFile(name)
-		if err != nil {
-			logFatalf("Error reading %q: %v", name, err)
-		}
-		identities = append(identities, ids...)
-	}
+	decrypt(identities, in, out)
+}
 
+func decrypt(identities []age.Identity, in io.Reader, out io.Writer) {
 	rr := bufio.NewReader(in)
+	if intro, _ := rr.Peek(len(crlfMangledIntro)); string(intro) == crlfMangledIntro ||
+		string(intro) == utf16MangledIntro {
+		errorWithHint("invalid header intro",
+			"it looks like this file was corrupted by PowerShell redirection",
+			"consider using -o or -a to encrypt files in PowerShell")
+	}
+
 	if start, _ := rr.Peek(len(armor.Header)); string(start) == armor.Header {
 		in = armor.NewReader(rr)
 	} else {
@@ -337,34 +452,46 @@ func decrypt(keys []string, in io.Reader, out io.Writer) {
 
 	r, err := age.Decrypt(in, identities...)
 	if err != nil {
-		logFatalf("Error: %v", err)
+		errorf("%v", err)
 	}
 	if _, err := io.Copy(out, r); err != nil {
-		logFatalf("Error: %v", err)
+		errorf("%v", err)
 	}
 }
 
-func passphrasePrompt() (string, error) {
-	fmt.Fprintf(os.Stderr, "Enter passphrase: ")
-	pass, err := readPassphrase()
+func passphrasePromptForDecryption() (string, error) {
+	pass, err := readSecret("Enter passphrase:")
 	if err != nil {
 		return "", fmt.Errorf("could not read passphrase: %v", err)
 	}
 	return string(pass), nil
 }
 
-func identityToRecipient(id age.Identity) (age.Recipient, error) {
-	switch id := id.(type) {
-	case *age.X25519Identity:
-		return id.Recipient(), nil
-	case *agessh.RSAIdentity:
-		return id.Recipient(), nil
-	case *agessh.Ed25519Identity:
-		return id.Recipient(), nil
-	case *agessh.EncryptedSSHIdentity:
-		return id.Recipient()
+func identitiesToRecipients(ids []age.Identity) ([]age.Recipient, error) {
+	var recipients []age.Recipient
+	for _, id := range ids {
+		switch id := id.(type) {
+		case *age.X25519Identity:
+			recipients = append(recipients, id.Recipient())
+		case *plugin.Identity:
+			recipients = append(recipients, id.Recipient())
+		case *agessh.RSAIdentity:
+			recipients = append(recipients, id.Recipient())
+		case *agessh.Ed25519Identity:
+			recipients = append(recipients, id.Recipient())
+		case *agessh.EncryptedSSHIdentity:
+			recipients = append(recipients, id.Recipient())
+		case *EncryptedIdentity:
+			r, err := id.Recipients()
+			if err != nil {
+				return nil, err
+			}
+			recipients = append(recipients, r...)
+		default:
+			return nil, fmt.Errorf("unexpected identity type: %T", id)
+		}
 	}
-	return nil, fmt.Errorf("unexpected identity type: %T", id)
+	return recipients, nil
 }
 
 type lazyOpener struct {
@@ -393,9 +520,3 @@ func (l *lazyOpener) Close() error {
 	}
 	return nil
 }
-
-func logFatalf(format string, v ...interface{}) {
-	_log.Printf(format, v...)
-	_log.Fatalf("[ Did age not do what you expected? Could an error be more useful?" +
-		" Tell us: https://filippo.io/age/report ]")
-}

cmd/age/age_test.go

@@ -1,14 +1,12 @@
-// Copyright 2019 Google LLC
-//
+// Copyright 2019 The age Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file or at
-// https://developers.google.com/open-source/licenses/bsd
+// license that can be found in the LICENSE file.
 
 package main
 
 import (
 	"errors"
-	"io/ioutil"
+	"io"
 	"os"
 	"path/filepath"
 	"strings"
@@ -18,24 +16,30 @@ import (
 )
 
 func TestVectors(t *testing.T) {
-	defaultIDs, err := parseIdentitiesFile("testdata/default_key.txt")
+	var defaultIDs []age.Identity
+
+	password, err := os.ReadFile("testdata/default_password.txt")
 	if err != nil {
 		t.Fatal(err)
 	}
-	password, err := ioutil.ReadFile("testdata/default_password.txt")
-	if err == nil {
-		p := strings.TrimSpace(string(password))
-		i, err := age.NewScryptIdentity(p)
-		if err != nil {
-			t.Fatal(err)
-		}
-		defaultIDs = append(defaultIDs, i)
+	p := strings.TrimSpace(string(password))
+	i, err := age.NewScryptIdentity(p)
+	if err != nil {
+		t.Fatal(err)
 	}
+	defaultIDs = append(defaultIDs, i)
+
+	ids, err := parseIdentitiesFile("testdata/default_key.txt")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defaultIDs = append(defaultIDs, ids...)
 
 	files, _ := filepath.Glob("testdata/*.age")
 	for _, f := range files {
 		_, name := filepath.Split(f)
 		name = strings.TrimSuffix(name, ".age")
+		expectPass := strings.HasPrefix(name, "good_")
 		expectFailure := strings.HasPrefix(name, "fail_")
 		expectNoMatch := strings.HasPrefix(name, "nomatch_")
 		t.Run(name, func(t *testing.T) {
@@ -44,7 +48,7 @@ func TestVectors(t *testing.T) {
 			if err == nil {
 				identities = ids
 			}
-			password, err := ioutil.ReadFile("testdata/" + name + "_password.txt")
+			password, err := os.ReadFile("testdata/" + name + "_password.txt")
 			if err == nil {
 				p := strings.TrimSpace(string(password))
 				i, err := age.NewScryptIdentity(p)
@@ -61,27 +65,32 @@ func TestVectors(t *testing.T) {
 			r, err := age.Decrypt(in, identities...)
 			if expectFailure {
 				if err == nil {
-					t.Fatal("expected Decrypt failure")
+					_, err = io.ReadAll(r)
 				}
-				if e := (&age.NoIdentityMatchError{}); errors.As(err, &e) {
+				if err == nil {
+					t.Fatal("expected Decrypt or Read failure")
+				}
+				if e := new(age.NoIdentityMatchError); errors.As(err, &e) {
 					t.Errorf("got ErrIncorrectIdentity, expected more specific error")
 				}
 			} else if expectNoMatch {
 				if err == nil {
 					t.Fatal("expected Decrypt failure")
 				}
-				if e := (&age.NoIdentityMatchError{}); !errors.As(err, &e) {
+				if e := new(age.NoIdentityMatchError); !errors.As(err, &e) {
 					t.Errorf("expected ErrIncorrectIdentity, got %v", err)
 				}
-			} else {
+			} else if expectPass {
 				if err != nil {
 					t.Fatal(err)
 				}
-				out, err := ioutil.ReadAll(r)
+				out, err := io.ReadAll(r)
 				if err != nil {
 					t.Fatal(err)
 				}
 				t.Logf("%s", out)
+			} else {
+				t.Fatal("invalid test vector: missing prefix")
 			}
 		})
 	}

cmd/age/encrypted_keys.go

@@ -1,20 +1,20 @@
-// Copyright 2019 Google LLC
-//
+// Copyright 2019 The age Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file or at
-// https://developers.google.com/open-source/licenses/bsd
+// license that can be found in the LICENSE file.
 
 package main
 
 import (
+	"bytes"
 	"errors"
 	"fmt"
-	"os"
 
 	"filippo.io/age"
-	"golang.org/x/term"
 )
 
+// LazyScryptIdentity is an age.Identity that requests a passphrase only if it
+// encounters an scrypt stanza. After obtaining a passphrase, it delegates to
+// ScryptIdentity.
 type LazyScryptIdentity struct {
 	Passphrase func() (string, error)
 }
@@ -22,6 +22,11 @@ type LazyScryptIdentity struct {
 var _ age.Identity = &LazyScryptIdentity{}
 
 func (i *LazyScryptIdentity) Unwrap(stanzas []*age.Stanza) (fileKey []byte, err error) {
+	for _, s := range stanzas {
+		if s.Type == "scrypt" && len(stanzas) != 1 {
+			return nil, errors.New("an scrypt recipient must be the only one")
+		}
+	}
 	if len(stanzas) != 1 || stanzas[0].Type != "scrypt" {
 		return nil, age.ErrIncorrectIdentity
 	}
@@ -45,23 +50,55 @@ func (i *LazyScryptIdentity) Unwrap(stanzas []*age.Stanza) (fileKey []byte, err
 	return fileKey, err
 }
 
-// readPassphrase reads a passphrase from the terminal. If stdin is not
-// connected to a terminal, it tries /dev/tty and fails if that's not available.
-// It does not read from a non-terminal stdin, so it does not check stdinInUse.
-func readPassphrase() ([]byte, error) {
-	fd := int(os.Stdin.Fd())
-	if !term.IsTerminal(fd) {
-		tty, err := os.Open("/dev/tty")
+type EncryptedIdentity struct {
+	Contents       []byte
+	Passphrase     func() (string, error)
+	NoMatchWarning func()
+
+	identities []age.Identity
+}
+
+var _ age.Identity = &EncryptedIdentity{}
+
+func (i *EncryptedIdentity) Recipients() ([]age.Recipient, error) {
+	if i.identities == nil {
+		if err := i.decrypt(); err != nil {
+			return nil, err
+		}
+	}
+
+	return identitiesToRecipients(i.identities)
+}
+
+func (i *EncryptedIdentity) Unwrap(stanzas []*age.Stanza) (fileKey []byte, err error) {
+	if i.identities == nil {
+		if err := i.decrypt(); err != nil {
+			return nil, err
+		}
+	}
+
+	for _, id := range i.identities {
+		fileKey, err = id.Unwrap(stanzas)
+		if errors.Is(err, age.ErrIncorrectIdentity) {
+			continue
+		}
 		if err != nil {
-			return nil, fmt.Errorf("standard input is not a terminal, and opening /dev/tty failed: %v", err)
+			return nil, err
 		}
-		defer tty.Close()
-		fd = int(tty.Fd())
+		return fileKey, nil
+	}
+	i.NoMatchWarning()
+	return nil, age.ErrIncorrectIdentity
+}
+
+func (i *EncryptedIdentity) decrypt() error {
+	d, err := age.Decrypt(bytes.NewReader(i.Contents), &LazyScryptIdentity{i.Passphrase})
+	if e := new(age.NoIdentityMatchError); errors.As(err, &e) {
+		return fmt.Errorf("identity file is encrypted with age but not with a passphrase")
 	}
-	defer fmt.Fprintf(os.Stderr, "\n")
-	p, err := term.ReadPassword(fd)
 	if err != nil {
-		return nil, err
+		return fmt.Errorf("failed to decrypt identity file: %v", err)
 	}
-	return p, nil
+	i.identities, err = parseIdentities(d)
+	return err
 }

cmd/age/parse.go

@@ -1,8 +1,6 @@
-// Copyright 2019 Google LLC
-//
+// Copyright 2019 The age Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file or at
-// https://developers.google.com/open-source/licenses/bsd
+// license that can be found in the LICENSE file.
 
 package main
 
@@ -11,30 +9,36 @@ import (
 	"encoding/base64"
 	"fmt"
 	"io"
-	"io/ioutil"
-	"log"
 	"os"
 	"strings"
 
 	"filippo.io/age"
 	"filippo.io/age/agessh"
+	"filippo.io/age/armor"
+	"filippo.io/age/internal/plugin"
 	"golang.org/x/crypto/cryptobyte"
 	"golang.org/x/crypto/ssh"
 )
 
-// stdinInUse is set in main. It's a singleton like os.Stdin.
-var stdinInUse bool
+type gitHubRecipientError struct {
+	username string
+}
+
+func (gitHubRecipientError) Error() string {
+	return `"github:" recipients were removed from the design`
+}
 
 func parseRecipient(arg string) (age.Recipient, error) {
 	switch {
+	case strings.HasPrefix(arg, "age1") && strings.Count(arg, "1") > 1:
+		return plugin.NewRecipient(arg, pluginTerminalUI)
 	case strings.HasPrefix(arg, "age1"):
 		return age.ParseX25519Recipient(arg)
 	case strings.HasPrefix(arg, "ssh-"):
 		return agessh.ParseRecipient(arg)
 	case strings.HasPrefix(arg, "github:"):
 		name := strings.TrimPrefix(arg, "github:")
-		return nil, fmt.Errorf(`"github:" recipients were removed from the design.`+"\n"+
-			"Instead, use recipient files like\n\n    curl -O https://github.com/%s.keys\n    age -R %s.keys\n\n", name, name)
+		return nil, gitHubRecipientError{name}
 	}
 
 	return nil, fmt.Errorf("unknown recipient type: %q", arg)
@@ -75,7 +79,7 @@ func parseRecipientsFile(name string) ([]age.Recipient, error) {
 		if err != nil {
 			if t, ok := sshKeyType(line); ok {
 				// Skip unsupported but valid SSH public keys with a warning.
-				log.Printf("Warning: recipients file %q: ignoring unsupported SSH key of type %q at line %d", name, t, n)
+				warningf("recipients file %q: ignoring unsupported SSH key of type %q at line %d", name, t, n)
 				continue
 			}
 			// Hide the error since it might unintentionally leak the contents
@@ -117,8 +121,8 @@ func sshKeyType(s string) (string, bool) {
 }
 
 // parseIdentitiesFile parses a file that contains age or SSH keys. It returns
-// one of *age.X25519Identity, *agessh.RSAIdentity, *agessh.Ed25519Identity, or
-// *agessh.EncryptedSSHIdentity.
+// one or more of *age.X25519Identity, *agessh.RSAIdentity, *agessh.Ed25519Identity,
+// *agessh.EncryptedSSHIdentity, or *EncryptedIdentity.
 func parseIdentitiesFile(name string) ([]age.Identity, error) {
 	var f *os.File
 	if name == "-" {
@@ -137,10 +141,42 @@ func parseIdentitiesFile(name string) ([]age.Identity, error) {
 	}
 
 	b := bufio.NewReader(f)
-	const pemHeader = "-----BEGIN"
-	if peeked, _ := b.Peek(len(pemHeader)); string(peeked) == pemHeader {
+	p, _ := b.Peek(14) // length of "age-encryption" and "-----BEGIN AGE"
+	peeked := string(p)
+
+	switch {
+	// An age encrypted file, plain or armored.
+	case peeked == "age-encryption" || peeked == "-----BEGIN AGE":
+		var r io.Reader = b
+		if peeked == "-----BEGIN AGE" {
+			r = armor.NewReader(r)
+		}
+		const privateKeySizeLimit = 1 << 24 // 16 MiB
+		contents, err := io.ReadAll(io.LimitReader(r, privateKeySizeLimit))
+		if err != nil {
+			return nil, fmt.Errorf("failed to read %q: %v", name, err)
+		}
+		if len(contents) == privateKeySizeLimit {
+			return nil, fmt.Errorf("failed to read %q: file too long", name)
+		}
+		return []age.Identity{&EncryptedIdentity{
+			Contents: contents,
+			Passphrase: func() (string, error) {
+				pass, err := readSecret(fmt.Sprintf("Enter passphrase for identity file %q:", name))
+				if err != nil {
+					return "", fmt.Errorf("could not read passphrase: %v", err)
+				}
+				return string(pass), nil
+			},
+			NoMatchWarning: func() {
+				warningf("encrypted identity file %q didn't match file's recipients", name)
+			},
+		}}, nil
+
+	// Another PEM file, possibly an SSH private key.
+	case strings.HasPrefix(peeked, "-----BEGIN"):
 		const privateKeySizeLimit = 1 << 14 // 16 KiB
-		contents, err := ioutil.ReadAll(io.LimitReader(b, privateKeySizeLimit))
+		contents, err := io.ReadAll(io.LimitReader(b, privateKeySizeLimit))
 		if err != nil {
 			return nil, fmt.Errorf("failed to read %q: %v", name, err)
 		}
@@ -148,11 +184,53 @@ func parseIdentitiesFile(name string) ([]age.Identity, error) {
 			return nil, fmt.Errorf("failed to read %q: file too long", name)
 		}
 		return parseSSHIdentity(name, contents)
-	}
 
-	ids, err := age.ParseIdentities(b)
-	if err != nil {
-		return nil, fmt.Errorf("failed to read %q: %v", name, err)
+	// An unencrypted age identity file.
+	default:
+		ids, err := parseIdentities(b)
+		if err != nil {
+			return nil, fmt.Errorf("failed to read %q: %v", name, err)
+		}
+		return ids, nil
+	}
+}
+
+func parseIdentity(s string) (age.Identity, error) {
+	switch {
+	case strings.HasPrefix(s, "AGE-PLUGIN-"):
+		return plugin.NewIdentity(s, pluginTerminalUI)
+	case strings.HasPrefix(s, "AGE-SECRET-KEY-1"):
+		return age.ParseX25519Identity(s)
+	default:
+		return nil, fmt.Errorf("unknown identity type")
+	}
+}
+
+// parseIdentities is like age.ParseIdentities, but supports plugin identities.
+func parseIdentities(f io.Reader) ([]age.Identity, error) {
+	const privateKeySizeLimit = 1 << 24 // 16 MiB
+	var ids []age.Identity
+	scanner := bufio.NewScanner(io.LimitReader(f, privateKeySizeLimit))
+	var n int
+	for scanner.Scan() {
+		n++
+		line := scanner.Text()
+		if strings.HasPrefix(line, "#") || line == "" {
+			continue
+		}
+
+		i, err := parseIdentity(line)
+		if err != nil {
+			return nil, fmt.Errorf("error at line %d: %v", n, err)
+		}
+		ids = append(ids, i)
+
+	}
+	if err := scanner.Err(); err != nil {
+		return nil, fmt.Errorf("failed to read secret keys file: %v", err)
+	}
+	if len(ids) == 0 {
+		return nil, fmt.Errorf("no secret keys found")
 	}
 	return ids, nil
 }
@@ -168,8 +246,7 @@ func parseSSHIdentity(name string, pemBytes []byte) ([]age.Identity, error) {
 			}
 		}
 		passphrasePrompt := func() ([]byte, error) {
-			fmt.Fprintf(os.Stderr, "Enter passphrase for %q: ", name)
-			pass, err := readPassphrase()
+			pass, err := readSecret(fmt.Sprintf("Enter passphrase for %q:", name))
 			if err != nil {
 				return nil, fmt.Errorf("could not read passphrase for %q: %v", name, err)
 			}
@@ -201,7 +278,7 @@ Use a file for which the corresponding ".pub" file exists, or convert the privat
 Ensure %q exists, or convert the private key %q to a modern format with "ssh-keygen -p -m RFC4716"`, name, err, name+".pub", name)
 	}
 	defer f.Close()
-	contents, err := ioutil.ReadAll(f)
+	contents, err := io.ReadAll(f)
 	if err != nil {
 		return nil, fmt.Errorf("failed to read %q: %v", name+".pub", err)
 	}

cmd/age/testdata/fail_bad_hmac.age

@@ -0,0 +1,5 @@
+age-encryption.org/v1
+-> X25519 i6JOY3uvMdBuEybYbTp3ECFsOPEY/A3lJY1l0Qv2NC4
+cD7VpfIOchU6ZjAccEjlPCNSOdJvVkxZPSf+7XS1YhY
+--- 1111111111111111111111111111111111111111111
+�-\�P9��0�hń��Tt�|:٘�#&R�r� ��

cmd/age/testdata/good_empty_payload.age

@@ -0,0 +1,5 @@
+age-encryption.org/v1
+-> X25519 JRosIz2avWchP2qSL6wF6U7uzD6kDuJXDbZvN1MOGmo
+KpIQxpkbBDHqp+JsHLiTy2d5RYRwp2qzvUrAe0aDOnk
+--- orVjbqbzm8U3S9njAs53o4PFi1wK39fIQQ4gRj3i7IU
+„Ïgñ¾�Ô0‡‘µÆN¢'jûöao�¹&æT

cmd/age/testdata/good_simple.age

@@ -0,0 +1,6 @@
+age-encryption.org/v1
+-> X25519 kx2RzHNfNuts0I131KwMCyYclZzKCGMzPUaMkH9J4z4
+9qEzjtIF4NsLFnxv8EEtCwOQiXj5WHl+HWaDKNeAk+4
+--- N+7l3M/ofCyzZVlPJ33CTHH8AddF0itK70QV+IIvXXA
+³]Ú	 É+zAIÉúçê¸Ç�éLüü“ªžà
+Hˆ%Ñ¥£

cmd/age/tui.go

@@ -0,0 +1,187 @@
+// Copyright 2021 The age Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package main
+
+// This file implements the terminal UI of cmd/age. The rules are:
+//
+//   - Anything that requires user interaction goes to the terminal,
+//     and is erased afterwards if possible. This UI would be possible
+//     to replace with a pinentry with no output or UX changes.
+//
+//   - Everything else goes to standard error with an "age:" prefix.
+//     No capitalized initials and no periods at the end.
+
+import (
+	"errors"
+	"fmt"
+	"io"
+	"log"
+	"os"
+	"runtime"
+
+	"filippo.io/age/internal/plugin"
+	"golang.org/x/term"
+)
+
+// l is a logger with no prefixes.
+var l = log.New(os.Stderr, "", 0)
+
+func printf(format string, v ...interface{}) {
+	l.Printf("age: "+format, v...)
+}
+
+func errorf(format string, v ...interface{}) {
+	l.Printf("age: error: "+format, v...)
+	l.Fatalf("age: report unexpected or unhelpful errors at https://filippo.io/age/report")
+}
+
+func warningf(format string, v ...interface{}) {
+	l.Printf("age: warning: "+format, v...)
+}
+
+func errorWithHint(error string, hints ...string) {
+	l.Printf("age: error: %s", error)
+	for _, hint := range hints {
+		l.Printf("age: hint: %s", hint)
+	}
+	l.Fatalf("age: report unexpected or unhelpful errors at https://filippo.io/age/report")
+}
+
+// clearLine clears the current line on the terminal, or opens a new line if
+// terminal escape codes don't work.
+func clearLine(out io.Writer) {
+	const (
+		CUI = "\033["   // Control Sequence Introducer
+		CPL = CUI + "F" // Cursor Previous Line
+		EL  = CUI + "K" // Erase in Line
+	)
+
+	// First, open a new line, which is guaranteed to work everywhere. Then, try
+	// to erase the line above with escape codes.
+	//
+	// (We use CRLF instead of LF to work around an apparent bug in WSL2's
+	// handling of CONOUT$. Only when running a Windows binary from WSL2, the
+	// cursor would not go back to the start of the line with a simple LF.
+	// Honestly, it's impressive CONIN$ and CONOUT$ work at all inside WSL2.)
+	fmt.Fprintf(out, "\r\n"+CPL+EL)
+}
+
+// withTerminal runs f with the terminal input and output files, if available.
+// withTerminal does not open a non-terminal stdin, so the caller does not need
+// to check stdinInUse.
+func withTerminal(f func(in, out *os.File) error) error {
+	var in, out *os.File
+	if runtime.GOOS == "windows" {
+		var err error
+		in, err = os.OpenFile("CONIN$", os.O_RDWR, 0)
+		if err != nil {
+			return err
+		}
+		defer in.Close()
+		out, err = os.OpenFile("CONOUT$", os.O_WRONLY, 0)
+		if err != nil {
+			return err
+		}
+		defer out.Close()
+	} else if tty, err := os.OpenFile("/dev/tty", os.O_RDWR, 0); err == nil {
+		defer tty.Close()
+		in, out = tty, tty
+	} else {
+		if !term.IsTerminal(int(os.Stdin.Fd())) {
+			return fmt.Errorf("standard input is not a terminal, and /dev/tty is not available: %v", err)
+		}
+		in, out = os.Stdin, os.Stderr
+	}
+	return f(in, out)
+}
+
+// readSecret reads a value from the terminal with no echo. The prompt is ephemeral.
+func readSecret(prompt string) (s []byte, err error) {
+	err = withTerminal(func(in, out *os.File) error {
+		fmt.Fprintf(out, "%s ", prompt)
+		defer clearLine(out)
+		s, err = term.ReadPassword(int(in.Fd()))
+		return err
+	})
+	return
+}
+
+// readSecret reads a single character from the terminal with no echo. The
+// prompt is ephemeral.
+func readCharacter(prompt string) (c byte, err error) {
+	err = withTerminal(func(in, out *os.File) error {
+		fmt.Fprintf(out, "%s ", prompt)
+		defer clearLine(out)
+
+		oldState, err := term.MakeRaw(int(in.Fd()))
+		if err != nil {
+			return err
+		}
+		defer term.Restore(int(in.Fd()), oldState)
+
+		b := make([]byte, 1)
+		if _, err := in.Read(b); err != nil {
+			return err
+		}
+
+		c = b[0]
+		return nil
+	})
+	return
+}
+
+var pluginTerminalUI = &plugin.ClientUI{
+	DisplayMessage: func(name, message string) error {
+		printf("%s plugin: %s", name, message)
+		return nil
+	},
+	RequestValue: func(name, message string, _ bool) (s string, err error) {
+		defer func() {
+			if err != nil {
+				warningf("could not read value for age-plugin-%s: %v", name, err)
+			}
+		}()
+		secret, err := readSecret(message)
+		if err != nil {
+			return "", err
+		}
+		return string(secret), nil
+	},
+	Confirm: func(name, message, yes, no string) (choseYes bool, err error) {
+		defer func() {
+			if err != nil {
+				warningf("could not read value for age-plugin-%s: %v", name, err)
+			}
+		}()
+		if no == "" {
+			message += fmt.Sprintf(" (press enter for %q)", yes)
+			_, err := readSecret(message)
+			if err != nil {
+				return false, err
+			}
+			return true, nil
+		}
+		message += fmt.Sprintf(" (press [1] for %q or [2] for %q)", yes, no)
+		for {
+			selection, err := readCharacter(message)
+			if err != nil {
+				return false, err
+			}
+			switch selection {
+			case '1':
+				return true, nil
+			case '2':
+				return false, nil
+			case '\x03': // CTRL-C
+				return false, errors.New("user cancelled prompt")
+			default:
+				warningf("reading value for age-plugin-%s: invalid selection %q", name, selection)
+			}
+		}
+	},
+	WaitTimer: func(name string) {
+		printf("waiting on %s plugin...", name)
+	},
+}

cmd/age/wordlist.go

@@ -1,8 +1,6 @@
-// Copyright 2019 Google LLC
-//
+// Copyright 2019 The age Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file or at
-// https://developers.google.com/open-source/licenses/bsd
+// license that can be found in the LICENSE file.
 
 package main
 

doc/age-keygen.1

@@ -1,7 +1,7 @@
 .\" generated with Ronn/v0.7.3
 .\" http://github.com/rtomayko/ronn/tree/0.7.3
 .
-.TH "AGE\-KEYGEN" "1" "May 2021" "" ""
+.TH "AGE\-KEYGEN" "1" "June 2022" "" ""
 .
 .SH "NAME"
 \fBage\-keygen\fR \- generate age(1) key pairs
@@ -68,7 +68,7 @@ Public key: age1ql3z7hjy54pw3hyww5ayyfg7zqgvc7w3j2elw8zmrj2kg5sfn9aqmcac8p
 .IP "" 0
 .
 .P
-Convert an identity to a receipient:
+Convert an identity to a recipient:
 .
 .IP "" 4
 .

doc/age-keygen.1.html

@@ -115,7 +115,7 @@ AGE-SECRET-KEY-1N9JEPW6DWJ0ZQUDX63F5A03GX8QUW7PXDE39N8UYF82VZ9PC8UFS3M7XA9
 Public key: age1ql3z7hjy54pw3hyww5ayyfg7zqgvc7w3j2elw8zmrj2kg5sfn9aqmcac8p
 </code></pre>
 
-<p>Convert an identity to a receipient:</p>
+<p>Convert an identity to a recipient:</p>
 
 <pre><code>$ age-keygen -y key.txt
 age1ql3z7hjy54pw3hyww5ayyfg7zqgvc7w3j2elw8zmrj2kg5sfn9aqmcac8p
@@ -127,12 +127,12 @@ age1ql3z7hjy54pw3hyww5ayyfg7zqgvc7w3j2elw8zmrj2kg5sfn9aqmcac8p
 
 <h2 id="AUTHORS">AUTHORS</h2>
 
-<p>Filippo Valsorda <a href="&#x6d;&#97;&#105;&#x6c;&#x74;&#111;&#x3a;&#x61;&#103;&#101;&#x40;&#x66;&#x69;&#x6c;&#x69;&#112;&#x70;&#111;&#x2e;&#x69;&#111;" data-bare-link="true">&#x61;&#x67;&#x65;&#64;&#x66;&#x69;&#x6c;&#x69;&#112;&#112;&#111;&#46;&#105;&#x6f;</a></p>
+<p>Filippo Valsorda <a href="mailto:age@filippo.io" data-bare-link="true">age@filippo.io</a></p>
 
 
   <ol class='man-decor man-foot man foot'>
     <li class='tl'></li>
-    <li class='tc'>May 2021</li>
+    <li class='tc'>June 2022</li>
     <li class='tr'>age-keygen(1)</li>
   </ol>
 

doc/age-keygen.1.ronn

@@ -43,7 +43,7 @@ Write a new identity to `key.txt`:
     $ age-keygen -o key.txt
     Public key: age1ql3z7hjy54pw3hyww5ayyfg7zqgvc7w3j2elw8zmrj2kg5sfn9aqmcac8p
 
-Convert an identity to a receipient:
+Convert an identity to a recipient:
 
     $ age-keygen -y key.txt
     age1ql3z7hjy54pw3hyww5ayyfg7zqgvc7w3j2elw8zmrj2kg5sfn9aqmcac8p

doc/age.1

@@ -1,7 +1,7 @@
 .\" generated with Ronn/v0.7.3
 .\" http://github.com/rtomayko/ronn/tree/0.7.3
 .
-.TH "AGE" "1" "May 2021" "" ""
+.TH "AGE" "1" "June 2022" "" ""
 .
 .SH "NAME"
 \fBage\fR \- simple, modern, and secure file encryption
@@ -13,7 +13,7 @@
 \fBage\fR [\fB\-\-encrypt\fR] \fB\-\-passphrase\fR [\fB\-\-armor\fR] [\fB\-o\fR \fIOUTPUT\fR] [\fIINPUT\fR]
 .
 .br
-\fBage\fR \fB\-\-decrypt\fR [\fB\-i\fR \fIPATH\fR]\.\.\. [\fB\-o\fR \fIOUTPUT\fR] [\fIINPUT\fR]
+\fBage\fR \fB\-\-decrypt\fR [\fB\-i\fR \fIPATH\fR | \fB\-j\fR \fIPLUGIN\fR]\.\.\. [\fB\-o\fR \fIOUTPUT\fR] [\fIINPUT\fR]
 .
 .br
 .
@@ -21,10 +21,10 @@
 \fBage\fR encrypts or decrypts \fIINPUT\fR to \fIOUTPUT\fR\. The \fIINPUT\fR argument is optional and defaults to standard input\. Only a single \fIINPUT\fR file may be specified\. If \fB\-o\fR is not specified, \fIOUTPUT\fR defaults to standard output\.
 .
 .P
-If \fB\-\-passphrase\fR is specified, the file is encrypted with a passphrase requested interactively\. Otherwise, it\'s encrypted to one or more \fIRECIPIENTS\fR specified with \fB\-r\fR/\fB\-\-recipient\fR or \fB\-R\fR/\fB\-\-recipients\-file\fR\. Every recipient can decrypt the file\.
+If \fB\-p\fR/\fB\-\-passphrase\fR is specified, the file is encrypted with a passphrase requested interactively\. Otherwise, it\'s encrypted to one or more \fIRECIPIENTS\fR specified with \fB\-r\fR/\fB\-\-recipient\fR or \fB\-R\fR/\fB\-\-recipients\-file\fR\. Every recipient can decrypt the file\.
 .
 .P
-In \fB\-\-decrypt\fR mode, passphrase\-encrypted files are detected automatically and the passphrase is requested interactively\. Otherwise, one or more \fIIDENTITIES\fR specified with \fB\-i\fR/\fB\-\-identity\fR are used to decrypt the file\.
+In \fB\-d\fR/\fB\-\-decrypt\fR mode, passphrase\-encrypted files are detected automatically and the passphrase is requested interactively\. Otherwise, one or more \fIIDENTITIES\fR specified with \fB\-i\fR/\fB\-\-identity\fR are used to decrypt the file\.
 .
 .P
 \fBage\fR encrypted files are binary and not malleable, with around 200 bytes of overhead per recipient, plus 16 bytes every 64KiB of plaintext\.
@@ -53,7 +53,7 @@ Encrypt \fIINPUT\fR to \fIOUTPUT\fR\. This is the default\.
 Encrypt to the explicitly specified \fIRECIPIENT\fR\. See the \fIRECIPIENTS AND IDENTITIES\fR section for possible recipient formats\.
 .
 .IP
-This option can be repeated and combined with \fB\-R\fR/\fB\-\-recipients\-file\fR, and the file can be decrypted by all provided recipients independently\.
+This option can be repeated and combined with other recipient flags, and the file can be decrypted by all provided recipients independently\.
 .
 .TP
 \fB\-R\fR, \fB\-\-recipients\-file\fR=\fIPATH\fR
@@ -63,14 +63,14 @@ Encrypt to the \fIRECIPIENTS\fR listed in the file at \fIPATH\fR, one per line\.
 If \fIPATH\fR is \fB\-\fR, the recipients are read from standard input\. In this case, the \fIINPUT\fR argument must be specified\.
 .
 .IP
-This option can be repeated and combined with \fB\-r\fR/\fB\-\-recipient\fR, and the file can be decrypted by all provided recipients independently\.
+This option can be repeated and combined with other recipient flags, and the file can be decrypted by all provided recipients independently\.
 .
 .TP
 \fB\-p\fR, \fB\-\-passphrase\fR
 Encrypt with a passphrase, requested interactively from the terminal\. \fBage\fR will offer to auto\-generate a secure passphrase\.
 .
 .IP
-This options can\'t be used with \fB\-r\fR/\fB\-\-recipient\fR or \fB\-R\fR/\fB\-\-recipients\-file\fR\.
+This option can\'t be used with other recipient flags\.
 .
 .TP
 \fB\-a\fR, \fB\-\-armor\fR
@@ -82,6 +82,26 @@ Encrypt to an ASCII\-only "armored" encoding\.
 .IP
 Decryption transparently detects and decodes ASCII armoring\.
 .
+.TP
+\fB\-i\fR, \fB\-\-identity\fR=\fIPATH\fR
+Encrypt to the \fIRECIPIENTS\fR corresponding to the \fIIDENTITIES\fR listed in the file at \fIPATH\fR\. This is equivalent to converting the file at \fIPATH\fR to a recipients file with \fBage\-keygen \-y\fR and then passing that to \fB\-R\fR/\fB\-\-recipients\-file\fR\.
+.
+.IP
+For the format of \fIPATH\fR, see the definition of \fB\-i\fR/\fB\-\-identity\fR in the \fIDecryption options\fR section\.
+.
+.IP
+\fB\-e\fR/\fB\-\-encrypt\fR must be explicitly specified when using \fB\-i\fR/\fB\-\-identity\fR in encryption mode to avoid confusion\.
+.
+.TP
+\fB\-j\fR \fIPLUGIN\fR
+Encrypt using the data\-less \fIplugin\fR \fIPLUGIN\fR\.
+.
+.IP
+This is equivalent to using \fB\-i\fR/\fB\-\-identity\fR with a file that contains a single plugin \fBIDENTITY\fR that encodes no plugin\-specific data\.
+.
+.IP
+\fB\-e\fR/\fB\-\-encrypt\fR must be explicitly specified when using \fB\-j\fR in encryption mode to avoid confusion\.
+.
 .SS "Decryption options"
 .
 .TP
@@ -105,16 +125,23 @@ Decrypt using the \fIIDENTITIES\fR at \fIPATH\fR\.
 a\. A file listing \fIIDENTITIES\fR one per line\. Empty lines and lines starting with "\fB#\fR" are ignored as comments\.
 .
 .IP
-b\. An SSH private key file, in PKCS#1, PKCS#8, SEC 1, or OpenSSH format\. If the private key is password\-protected, the password is requested interactively only if the SSH identity matches the file\. See the \fISSH keys\fR section for more information, including supported key types\.
+b\. A passphrase encrypted age file, containing \fIIDENTITIES\fR one per line like above\. The passphrase is requested interactively\. Note that passphrase\-protected identity files are not necessary for most use cases, where access to the encrypted identity file implies access to the whole system\.
 .
 .IP
-c\. "\fB\-\fR", causing one of the options above to be read from standard input\. In this case, the \fIINPUT\fR argument must be specified\.
+c\. An SSH private key file, in PKCS#1, PKCS#8, or OpenSSH format\. If the private key is password\-protected, the password is requested interactively only if the SSH identity matches the file\. See the \fISSH keys\fR section for more information, including supported key types\.
 .
 .IP
-This option can be repeated\. Identities are tried in the order in which are provided, and the first one matching one of the file\'s recipients is used\. Unused identities are ignored\.
+d\. "\fB\-\fR", causing one of the options above to be read from standard input\. In this case, the \fIINPUT\fR argument must be specified\.
 .
 .IP
-If \fB\-e\fR/\fB\-\-encrypt\fR is explicitly specified (to avoid confusion), \fB\-i\fR/\fB\-\-identity\fR may also be used to encrypt to the \fBRECIPIENTS\fR corresponding to the \fBIDENTITIES\fR listed at \fIPATH\fR\. This allows using an identity file as a symmetric key, if desired\.
+This option can be repeated\. Identities are tried in the order in which are provided, and the first one matching one of the file\'s recipients is used\. Unused identities are ignored, but it is an error if the \fIINPUT\fR file is passphrase\-encrypted and \fB\-i\fR/\fB\-\-identity\fR is specified\.
+.
+.TP
+\fB\-j\fR \fIPLUGIN\fR
+Decrypt using the data\-less \fIplugin\fR \fIPLUGIN\fR\.
+.
+.IP
+This is equivalent to using \fB\-i\fR/\fB\-\-identity\fR with a file that contains a single plugin \fBIDENTITY\fR that encodes no plugin\-specific data\.
 .
 .SH "RECIPIENTS AND IDENTITIES"
 \fBRECIPIENTS\fR are public values, like a public key, that a file can be encrypted to\. \fBIDENTITIES\fR are private values, like a private key, that allow decrypting a file encrypted to the corresponding \fBRECIPIENT\fR\.
@@ -180,6 +207,36 @@ An \fBIDENTITY\fR is an SSH private key \fIfile\fR passed individually to \fB\-i
 .P
 An encrypted file \fIcan\fR be linked to the SSH public key it was encrypted to\. This is so that \fBage\fR can identify the correct SSH private key before requesting its password, if any\.
 .
+.SS "Plugins"
+\fBage\fR can be extended through plugins\. A plugin is only loaded if a corresponding \fBRECIPIENT\fR or \fBIDENTITY\fR is specified\. (Simply decrypting a file encrypted with a plugin will not cause it to load, for security reasons among others\.)
+.
+.P
+A \fBRECIPIENT\fR for a plugin named \fBexample\fR starts with \fBage1example1\fR, while an \fBIDENTITY\fR starts with \fBAGE\-PLUGIN\-EXAMPLE\-1\fR\. They both encode arbitrary plugin\-specific data, and are generated by the plugin\.
+.
+.P
+When either is specified, \fBage\fR searches for \fBage\-plugin\-example\fR in the PATH and executes it to perform the file header encryption or decryption\. The plugin may request input from the user through \fBage\fR to complete the operation\.
+.
+.P
+Plugins can be freely mixed with other plugins or natively supported keys\.
+.
+.P
+A plugin is not bound to only encrypt or decrypt files meant for or generated by the plugin\. For example, a plugin can be used to decrypt files encrypted to a native X25519 \fBRECIPIENT\fR or even with a passphrase\. Similarly, a plugin can encrypt a file such that it can be decrypted without the use of any plugin\.
+.
+.P
+Plugins for which the \fBIDENTITY\fR/\fBRECIPIENT\fR distinction doesn\'t make sense (such as a symmetric encryption plugin) may generate only an \fBIDENTITY\fR and instruct the user to perform encryption with the \fB\-e\fR/\fB\-\-encrypt\fR and \fB\-i\fR/\fB\-\-identity\fR flags\. Plugins for which the concept of separate identities doesn\'t make sense (such as a password\-encryption plugin) may instruct the user to use the \fB\-j\fR flag\.
+.
+.SH "EXIT STATUS"
+\fBage\fR will exit 0 if and only if encryption or decryption are successful for the full length of the input\.
+.
+.P
+If an error occurs during decryption, partial output might still be generated, but only if it was possible to securely authenticate it\. No unauthenticathed output is ever released\.
+.
+.SH "BACKWARDS COMPATIBILITY"
+Files encrypted with a stable version (not alpha, beta, or release candidate) of \fBage\fR, or with any v1\.0\.0 beta or release candidate, will decrypt with any later version of the tool\.
+.
+.P
+If decrypting older files poses a security risk, doing so might cause an error by default\. In this case, a flag will be provided to force the operation\.
+.
 .SH "EXAMPLES"
 Generate a new identity, encrypt data, and decrypt:
 .
@@ -250,6 +307,27 @@ Enter passphrase:
 .IP "" 0
 .
 .P
+Encrypt and decrypt with a passphrase\-protected identity file:
+.
+.IP "" 4
+.
+.nf
+
+$ age\-keygen | age \-p > key\.age
+Public key: age1yhm4gctwfmrpz87tdslm550wrx6m79y9f2hdzt0lndjnehwj0ukqrjpyx5
+Enter passphrase (leave empty to autogenerate a secure one):
+Using the autogenerated passphrase "hip\-roast\-boring\-snake\-mention\-east\-wasp\-honey\-input\-actress"\.
+
+$ age \-r age1yhm4gctwfmrpz87tdslm550wrx6m79y9f2hdzt0lndjnehwj0ukqrjpyx5 secrets\.txt > secrets\.txt\.age
+
+$ age \-d \-i key\.age secrets\.txt\.age > secrets\.txt
+Enter passphrase for identity file "key\.age":
+.
+.fi
+.
+.IP "" 0
+.
+.P
 Encrypt and decrypt with an SSH public key:
 .
 .IP "" 4
@@ -265,6 +343,23 @@ $ age \-d \-i ~/\.ssh/id_ed25519 example\.jpg\.age > example\.jpg
 .IP "" 0
 .
 .P
+Encrypt and decrypt with age\-plugin\-yubikey:
+.
+.IP "" 4
+.
+.nf
+
+$ age\-plugin\-yubikey # run interactive setup, generate identity file and obtain recipient
+
+$ age \-r age1yubikey1qwt50d05nh5vutpdzmlg5wn80xq5negm4uj9ghv0snvdd3yysf5yw3rhl3t secrets\.txt > secrets\.txt\.age
+
+$ age \-d \-i age\-yubikey\-identity\-388178f3\.txt secrets\.txt\.age
+.
+.fi
+.
+.IP "" 0
+.
+.P
 Encrypt to the SSH keys of a GitHub user:
 .
 .IP "" 4

doc/age.1.html

@@ -58,6 +58,8 @@
     <a href="#DESCRIPTION">DESCRIPTION</a>
     <a href="#OPTIONS">OPTIONS</a>
     <a href="#RECIPIENTS-AND-IDENTITIES">RECIPIENTS AND IDENTITIES</a>
+    <a href="#EXIT-STATUS">EXIT STATUS</a>
+    <a href="#BACKWARDS-COMPATIBILITY">BACKWARDS COMPATIBILITY</a>
     <a href="#EXAMPLES">EXAMPLES</a>
     <a href="#SEE-ALSO">SEE ALSO</a>
     <a href="#AUTHORS">AUTHORS</a>
@@ -78,7 +80,7 @@
 
 <p><code>age</code> [<code>--encrypt</code>] (<code>-r</code> <var>RECIPIENT</var> | <code>-R</code> <var>PATH</var>)... [<code>--armor</code>] [<code>-o</code> <var>OUTPUT</var>] [<var>INPUT</var>]<br />
 <code>age</code> [<code>--encrypt</code>] <code>--passphrase</code> [<code>--armor</code>] [<code>-o</code> <var>OUTPUT</var>] [<var>INPUT</var>]<br />
-<code>age</code> <code>--decrypt</code> [<code>-i</code> <var>PATH</var>]... [<code>-o</code> <var>OUTPUT</var>] [<var>INPUT</var>]<br /></p>
+<code>age</code> <code>--decrypt</code> [<code>-i</code> <var>PATH</var> | <code>-j</code> <var>PLUGIN</var>]... [<code>-o</code> <var>OUTPUT</var>] [<var>INPUT</var>]<br /></p>
 
 <h2 id="DESCRIPTION">DESCRIPTION</h2>
 
@@ -86,13 +88,13 @@
 optional and defaults to standard input. Only a single <var>INPUT</var> file may be
 specified. If <code>-o</code> is not specified, <var>OUTPUT</var> defaults to standard output.</p>
 
-<p>If <code>--passphrase</code> is specified, the file is encrypted with a passphrase
+<p>If <code>-p</code>/<code>--passphrase</code> is specified, the file is encrypted with a passphrase
 requested interactively. Otherwise, it's encrypted to one or more
 <a href="#RECIPIENTS-AND-IDENTITIES" title="RECIPIENTS AND IDENTITIES" data-bare-link="true">RECIPIENTS</a> specified with <code>-r</code>/<code>--recipient</code> or
 <code>-R</code>/<code>--recipients-file</code>. Every recipient can decrypt the file.</p>
 
-<p>In <code>--decrypt</code> mode, passphrase-encrypted files are detected automatically and
-the passphrase is requested interactively. Otherwise, one or more
+<p>In <code>-d</code>/<code>--decrypt</code> mode, passphrase-encrypted files are detected automatically
+and the passphrase is requested interactively. Otherwise, one or more
 <a href="#RECIPIENTS-AND-IDENTITIES" title="RECIPIENTS AND IDENTITIES" data-bare-link="true">IDENTITIES</a> specified with <code>-i</code>/<code>--identity</code> are
 used to decrypt the file.</p>
 
@@ -118,7 +120,7 @@ overhead per recipient, plus 16 bytes every 64KiB of plaintext.</p>
 <dt><code>-r</code>, <code>--recipient</code>=<var>RECIPIENT</var></dt><dd><p>  Encrypt to the explicitly specified <var>RECIPIENT</var>. See the
   <a href="#RECIPIENTS-AND-IDENTITIES" title="RECIPIENTS AND IDENTITIES" data-bare-link="true">RECIPIENTS AND IDENTITIES</a> section for possible recipient formats.</p>
 
-<p>  This option can be repeated and combined with <code>-R</code>/<code>--recipients-file</code>,
+<p>  This option can be repeated and combined with other recipient flags,
   and the file can be decrypted by all provided recipients independently.</p></dd>
 <dt><code>-R</code>, <code>--recipients-file</code>=<var>PATH</var></dt><dd><p>  Encrypt to the <a href="#RECIPIENTS-AND-IDENTITIES" title="RECIPIENTS AND IDENTITIES" data-bare-link="true">RECIPIENTS</a> listed in the
   file at <var>PATH</var>, one per line. Empty lines and lines starting with <code>#</code>
@@ -127,13 +129,12 @@ overhead per recipient, plus 16 bytes every 64KiB of plaintext.</p>
 <p>  If <var>PATH</var> is <code>-</code>, the recipients are read from standard input. In
   this case, the <var>INPUT</var> argument must be specified.</p>
 
-<p>  This option can be repeated and combined with <code>-r</code>/<code>--recipient</code>,
+<p>  This option can be repeated and combined with other recipient flags,
   and the file can be decrypted by all provided recipients independently.</p></dd>
 <dt><code>-p</code>, <code>--passphrase</code></dt><dd><p>  Encrypt with a passphrase, requested interactively from the terminal.
   <code>age</code> will offer to auto-generate a secure passphrase.</p>
 
-<p>  This options can't be used with <code>-r</code>/<code>--recipient</code> or
-  <code>-R</code>/<code>--recipients-file</code>.</p></dd>
+<p>  This option can't be used with other recipient flags.</p></dd>
 <dt><code>-a</code>, <code>--armor</code></dt><dd><p>  Encrypt to an ASCII-only "armored" encoding.</p>
 
 <p>  <code>age</code> armor is a strict version of PEM with type <code>AGE ENCRYPTED FILE</code>,
@@ -141,6 +142,23 @@ overhead per recipient, plus 16 bytes every 64KiB of plaintext.</p>
   trailing extra data.</p>
 
 <p>  Decryption transparently detects and decodes ASCII armoring.</p></dd>
+<dt><code>-i</code>, <code>--identity</code>=<var>PATH</var></dt><dd><p>  Encrypt to the <a href="#RECIPIENTS-AND-IDENTITIES" title="RECIPIENTS AND IDENTITIES" data-bare-link="true">RECIPIENTS</a> corresponding to the
+  <a href="#RECIPIENTS-AND-IDENTITIES" title="RECIPIENTS AND IDENTITIES" data-bare-link="true">IDENTITIES</a> listed in the file at <var>PATH</var>. This
+  is equivalent to converting the file at <var>PATH</var> to a recipients file with
+  <code>age-keygen -y</code> and then passing that to <code>-R</code>/<code>--recipients-file</code>.</p>
+
+<p>  For the format of <var>PATH</var>, see the definition of <code>-i</code>/<code>--identity</code> in the
+  <a href="#Decryption-options" title="Decryption options" data-bare-link="true">Decryption options</a> section.</p>
+
+<p>  <code>-e</code>/<code>--encrypt</code> must be explicitly specified when using <code>-i</code>/<code>--identity</code>
+  in encryption mode to avoid confusion.</p></dd>
+<dt><code>-j</code> <var>PLUGIN</var></dt><dd><p>  Encrypt using the data-less <a href="#Plugins" title="Plugins" data-bare-link="true">plugin</a> <var>PLUGIN</var>.</p>
+
+<p>  This is equivalent to using <code>-i</code>/<code>--identity</code> with a file that contains a
+  single plugin <code>IDENTITY</code> that encodes no plugin-specific data.</p>
+
+<p>  <code>-e</code>/<code>--encrypt</code> must be explicitly specified when using <code>-j</code> in encryption
+  mode to avoid confusion.</p></dd>
 </dl>
 
 
@@ -162,22 +180,28 @@ overhead per recipient, plus 16 bytes every 64KiB of plaintext.</p>
 <p>  a. A file listing <a href="#RECIPIENTS-AND-IDENTITIES" title="RECIPIENTS AND IDENTITIES" data-bare-link="true">IDENTITIES</a> one per line.
   Empty lines and lines starting with "<code>#</code>" are ignored as comments.</p>
 
-<p>  b. An SSH private key file, in PKCS#1, PKCS#8, SEC 1, or OpenSSH format.
+<p>  b. A passphrase encrypted age file, containing
+  <a href="#RECIPIENTS-AND-IDENTITIES" title="RECIPIENTS AND IDENTITIES" data-bare-link="true">IDENTITIES</a> one per line like above.
+  The passphrase is requested interactively. Note that passphrase-protected
+  identity files are not necessary for most use cases, where access to the
+  encrypted identity file implies access to the whole system.</p>
+
+<p>  c. An SSH private key file, in PKCS#1, PKCS#8, or OpenSSH format.
   If the private key is password-protected, the password is requested
   interactively only if the SSH identity matches the file. See the
   <a href="#SSH-keys" title="SSH keys" data-bare-link="true">SSH keys</a> section for more information, including supported key types.</p>
 
-<p>  c. "<code>-</code>", causing one of the options above to be read from standard input.
+<p>  d. "<code>-</code>", causing one of the options above to be read from standard input.
   In this case, the <var>INPUT</var> argument must be specified.</p>
 
-<p>  This option can be repeated. Identities are tried in the order in which
-  are provided, and the first one matching one of the file's recipients is
-  used. Unused identities are ignored.</p>
+<p>  This option can be repeated. Identities are tried in the order in which are
+  provided, and the first one matching one of the file's recipients is used.
+  Unused identities are ignored, but it is an error if the <var>INPUT</var> file is
+  passphrase-encrypted and <code>-i</code>/<code>--identity</code> is specified.</p></dd>
+<dt><code>-j</code> <var>PLUGIN</var></dt><dd><p>  Decrypt using the data-less <a href="#Plugins" title="Plugins" data-bare-link="true">plugin</a> <var>PLUGIN</var>.</p>
 
-<p>  If <code>-e</code>/<code>--encrypt</code> is explicitly specified (to avoid confusion),
-  <code>-i</code>/<code>--identity</code> may also be used to encrypt to the <code>RECIPIENTS</code>
-  corresponding to the <code>IDENTITIES</code> listed at <var>PATH</var>. This allows using an
-  identity file as a symmetric key, if desired.</p></dd>
+<p>  This is equivalent to using <code>-i</code>/<code>--identity</code> with a file that contains a
+  single plugin <code>IDENTITY</code> that encodes no plugin-specific data.</p></dd>
 </dl>
 
 
@@ -237,6 +261,52 @@ or accessed via <span class="man-ref">ssh-agent<span class="s">(1)</span></span>
 This is so that <code>age</code> can identify the correct SSH private key before
 requesting its password, if any.</p>
 
+<h3 id="Plugins">Plugins</h3>
+
+<p><code>age</code> can be extended through plugins. A plugin is only loaded if a corresponding
+<code>RECIPIENT</code> or <code>IDENTITY</code> is specified. (Simply decrypting a file encrypted with
+a plugin will not cause it to load, for security reasons among others.)</p>
+
+<p>A <code>RECIPIENT</code> for a plugin named <code>example</code> starts with <code>age1example1</code>, while an
+<code>IDENTITY</code> starts with <code>AGE-PLUGIN-EXAMPLE-1</code>. They both encode arbitrary
+plugin-specific data, and are generated by the plugin.</p>
+
+<p>When either is specified, <code>age</code> searches for <code>age-plugin-example</code> in the PATH
+and executes it to perform the file header encryption or decryption. The plugin
+may request input from the user through <code>age</code> to complete the operation.</p>
+
+<p>Plugins can be freely mixed with other plugins or natively supported keys.</p>
+
+<p>A plugin is not bound to only encrypt or decrypt files meant for or generated by
+the plugin. For example, a plugin can be used to decrypt files encrypted to a
+native X25519 <code>RECIPIENT</code> or even with a passphrase. Similarly, a plugin can
+encrypt a file such that it can be decrypted without the use of any plugin.</p>
+
+<p>Plugins for which the <code>IDENTITY</code>/<code>RECIPIENT</code> distinction doesn't make sense
+(such as a symmetric encryption plugin) may generate only an <code>IDENTITY</code> and
+instruct the user to perform encryption with the <code>-e</code>/<code>--encrypt</code> and
+<code>-i</code>/<code>--identity</code> flags. Plugins for which the concept of separate identities
+doesn't make sense (such as a password-encryption plugin) may instruct the user
+to use the <code>-j</code> flag.</p>
+
+<h2 id="EXIT-STATUS">EXIT STATUS</h2>
+
+<p><code>age</code> will exit 0 if and only if encryption or decryption are successful for the
+full length of the input.</p>
+
+<p>If an error occurs during decryption, partial output might still be generated,
+but only if it was possible to securely authenticate it. No unauthenticathed
+output is ever released.</p>
+
+<h2 id="BACKWARDS-COMPATIBILITY">BACKWARDS COMPATIBILITY</h2>
+
+<p>Files encrypted with a stable version (not alpha, beta, or release candidate) of
+<code>age</code>, or with any v1.0.0 beta or release candidate, will decrypt with any later
+version of the tool.</p>
+
+<p>If decrypting older files poses a security risk, doing so might cause an error
+by default. In this case, a flag will be provided to force the operation.</p>
+
 <h2 id="EXAMPLES">EXAMPLES</h2>
 
 <p>Generate a new identity, encrypt data, and decrypt:</p>
@@ -276,6 +346,19 @@ $ age -d secrets.txt.age &gt; secrets.txt
 Enter passphrase:
 </code></pre>
 
+<p>Encrypt and decrypt with a passphrase-protected identity file:</p>
+
+<pre><code>$ age-keygen | age -p &gt; key.age
+Public key: age1yhm4gctwfmrpz87tdslm550wrx6m79y9f2hdzt0lndjnehwj0ukqrjpyx5
+Enter passphrase (leave empty to autogenerate a secure one):
+Using the autogenerated passphrase "hip-roast-boring-snake-mention-east-wasp-honey-input-actress".
+
+$ age -r age1yhm4gctwfmrpz87tdslm550wrx6m79y9f2hdzt0lndjnehwj0ukqrjpyx5 secrets.txt &gt; secrets.txt.age
+
+$ age -d -i key.age secrets.txt.age &gt; secrets.txt
+Enter passphrase for identity file "key.age":
+</code></pre>
+
 <p>Encrypt and decrypt with an SSH public key:</p>
 
 <pre><code>$ age -R ~/.ssh/id_ed25519.pub example.jpg &gt; example.jpg.age
@@ -283,6 +366,15 @@ Enter passphrase:
 $ age -d -i ~/.ssh/id_ed25519 example.jpg.age &gt; example.jpg
 </code></pre>
 
+<p>Encrypt and decrypt with age-plugin-yubikey:</p>
+
+<pre><code>$ age-plugin-yubikey # run interactive setup, generate identity file and obtain recipient
+
+$ age -r age1yubikey1qwt50d05nh5vutpdzmlg5wn80xq5negm4uj9ghv0snvdd3yysf5yw3rhl3t secrets.txt &gt; secrets.txt.age
+
+$ age -d -i age-yubikey-identity-388178f3.txt secrets.txt.age
+</code></pre>
+
 <p>Encrypt to the SSH keys of a GitHub user:</p>
 
 <pre><code>$ curl https://github.com/benjojo.keys | age -R - example.jpg &gt; example.jpg.age
@@ -294,12 +386,12 @@ $ age -d -i ~/.ssh/id_ed25519 example.jpg.age &gt; example.jpg
 
 <h2 id="AUTHORS">AUTHORS</h2>
 
-<p>Filippo Valsorda <a href="&#x6d;&#97;&#105;&#x6c;&#116;&#x6f;&#58;&#x61;&#103;&#x65;&#64;&#102;&#105;&#x6c;&#105;&#x70;&#x70;&#x6f;&#46;&#105;&#111;" data-bare-link="true">&#97;&#x67;&#x65;&#x40;&#x66;&#x69;&#108;&#105;&#x70;&#x70;&#x6f;&#x2e;&#105;&#111;</a></p>
+<p>Filippo Valsorda <a href="mailto:age@filippo.io" data-bare-link="true">age@filippo.io</a></p>
 
 
   <ol class='man-decor man-foot man foot'>
     <li class='tl'></li>
-    <li class='tc'>May 2021</li>
+    <li class='tc'>June 2022</li>
     <li class='tr'>age(1)</li>
   </ol>
 

doc/age.1.ronn

@@ -5,7 +5,7 @@ age(1) -- simple, modern, and secure file encryption
 
 `age` [`--encrypt`] (`-r` <RECIPIENT> | `-R` <PATH>)... [`--armor`] [`-o` <OUTPUT>] [<INPUT>]<br>
 `age` [`--encrypt`] `--passphrase` [`--armor`] [`-o` <OUTPUT>] [<INPUT>]<br>
-`age` `--decrypt` [`-i` <PATH>]... [`-o` <OUTPUT>] [<INPUT>]<br>
+`age` `--decrypt` [`-i` <PATH> | `-j` <PLUGIN>]... [`-o` <OUTPUT>] [<INPUT>]<br>
 
 ## DESCRIPTION
 
@@ -13,13 +13,13 @@ age(1) -- simple, modern, and secure file encryption
 optional and defaults to standard input. Only a single <INPUT> file may be
 specified. If `-o` is not specified, <OUTPUT> defaults to standard output.
 
-If `--passphrase` is specified, the file is encrypted with a passphrase
+If `-p`/`--passphrase` is specified, the file is encrypted with a passphrase
 requested interactively. Otherwise, it's encrypted to one or more
 [RECIPIENTS][RECIPIENTS AND IDENTITIES] specified with `-r`/`--recipient` or
 `-R`/`--recipients-file`. Every recipient can decrypt the file.
 
-In `--decrypt` mode, passphrase-encrypted files are detected automatically and
-the passphrase is requested interactively. Otherwise, one or more
+In `-d`/`--decrypt` mode, passphrase-encrypted files are detected automatically
+and the passphrase is requested interactively. Otherwise, one or more
 [IDENTITIES][RECIPIENTS AND IDENTITIES] specified with `-i`/`--identity` are
 used to decrypt the file.
 
@@ -47,7 +47,7 @@ overhead per recipient, plus 16 bytes every 64KiB of plaintext.
     Encrypt to the explicitly specified <RECIPIENT>. See the
     [RECIPIENTS AND IDENTITIES][] section for possible recipient formats.
 
-    This option can be repeated and combined with `-R`/`--recipients-file`,
+    This option can be repeated and combined with other recipient flags,
     and the file can be decrypted by all provided recipients independently.
 
 * `-R`, `--recipients-file`=<PATH>:
@@ -58,15 +58,14 @@ overhead per recipient, plus 16 bytes every 64KiB of plaintext.
     If <PATH> is `-`, the recipients are read from standard input. In
     this case, the <INPUT> argument must be specified.
 
-    This option can be repeated and combined with `-r`/`--recipient`,
+    This option can be repeated and combined with other recipient flags,
     and the file can be decrypted by all provided recipients independently.
 
 * `-p`, `--passphrase`:
     Encrypt with a passphrase, requested interactively from the terminal.
     `age` will offer to auto-generate a secure passphrase.
 
-    This options can't be used with `-r`/`--recipient` or
-    `-R`/`--recipients-file`.
+    This option can't be used with other recipient flags.
 
 * `-a`, `--armor`:
     Encrypt to an ASCII-only "armored" encoding.
@@ -77,6 +76,27 @@ overhead per recipient, plus 16 bytes every 64KiB of plaintext.
 
     Decryption transparently detects and decodes ASCII armoring.
 
+* `-i`, `--identity`=<PATH>:
+    Encrypt to the [RECIPIENTS][RECIPIENTS AND IDENTITIES] corresponding to the
+    [IDENTITIES][RECIPIENTS AND IDENTITIES] listed in the file at <PATH>. This
+    is equivalent to converting the file at <PATH> to a recipients file with
+    `age-keygen -y` and then passing that to `-R`/`--recipients-file`.
+
+    For the format of <PATH>, see the definition of `-i`/`--identity` in the
+    [Decryption options][] section.
+
+    `-e`/`--encrypt` must be explicitly specified when using `-i`/`--identity`
+    in encryption mode to avoid confusion.
+
+* `-j` <PLUGIN>:
+    Encrypt using the data-less [plugin][Plugins] <PLUGIN>.
+
+    This is equivalent to using `-i`/`--identity` with a file that contains a
+    single plugin `IDENTITY` that encodes no plugin-specific data.
+
+    `-e`/`--encrypt` must be explicitly specified when using `-j` in encryption
+    mode to avoid confusion.
+
 ### Decryption options
 
 * `-d`, `--decrypt`:
@@ -97,22 +117,30 @@ overhead per recipient, plus 16 bytes every 64KiB of plaintext.
     a\. A file listing [IDENTITIES][RECIPIENTS AND IDENTITIES] one per line.
     Empty lines and lines starting with "`#`" are ignored as comments.
 
-    b\. An SSH private key file, in PKCS#1, PKCS#8, SEC 1, or OpenSSH format.
+    b\. A passphrase encrypted age file, containing
+    [IDENTITIES][RECIPIENTS AND IDENTITIES] one per line like above.
+    The passphrase is requested interactively. Note that passphrase-protected
+    identity files are not necessary for most use cases, where access to the
+    encrypted identity file implies access to the whole system.
+
+    c\. An SSH private key file, in PKCS#1, PKCS#8, or OpenSSH format.
     If the private key is password-protected, the password is requested
     interactively only if the SSH identity matches the file. See the
     [SSH keys][] section for more information, including supported key types.
     
-    c\. "`-`", causing one of the options above to be read from standard input.
+    d\. "`-`", causing one of the options above to be read from standard input.
     In this case, the <INPUT> argument must be specified.
 
-    This option can be repeated. Identities are tried in the order in which
-    are provided, and the first one matching one of the file's recipients is
-    used. Unused identities are ignored.
+    This option can be repeated. Identities are tried in the order in which are
+    provided, and the first one matching one of the file's recipients is used.
+    Unused identities are ignored, but it is an error if the <INPUT> file is
+    passphrase-encrypted and `-i`/`--identity` is specified.
 
-    If `-e`/`--encrypt` is explicitly specified (to avoid confusion),
-    `-i`/`--identity` may also be used to encrypt to the `RECIPIENTS`
-    corresponding to the `IDENTITIES` listed at <PATH>. This allows using an
-    identity file as a symmetric key, if desired.
+* `-j` <PLUGIN>:
+    Decrypt using the data-less [plugin][Plugins] <PLUGIN>.
+
+    This is equivalent to using `-i`/`--identity` with a file that contains a
+    single plugin `IDENTITY` that encodes no plugin-specific data.
 
 ## RECIPIENTS AND IDENTITIES
 
@@ -167,6 +195,52 @@ An encrypted file _can_ be linked to the SSH public key it was encrypted to.
 This is so that `age` can identify the correct SSH private key before
 requesting its password, if any.
 
+### Plugins
+
+`age` can be extended through plugins. A plugin is only loaded if a corresponding
+`RECIPIENT` or `IDENTITY` is specified. (Simply decrypting a file encrypted with
+a plugin will not cause it to load, for security reasons among others.)
+
+A `RECIPIENT` for a plugin named `example` starts with `age1example1`, while an
+`IDENTITY` starts with `AGE-PLUGIN-EXAMPLE-1`. They both encode arbitrary
+plugin-specific data, and are generated by the plugin.
+
+When either is specified, `age` searches for `age-plugin-example` in the PATH
+and executes it to perform the file header encryption or decryption. The plugin
+may request input from the user through `age` to complete the operation.
+
+Plugins can be freely mixed with other plugins or natively supported keys.
+
+A plugin is not bound to only encrypt or decrypt files meant for or generated by
+the plugin. For example, a plugin can be used to decrypt files encrypted to a
+native X25519 `RECIPIENT` or even with a passphrase. Similarly, a plugin can
+encrypt a file such that it can be decrypted without the use of any plugin.
+
+Plugins for which the `IDENTITY`/`RECIPIENT` distinction doesn't make sense
+(such as a symmetric encryption plugin) may generate only an `IDENTITY` and
+instruct the user to perform encryption with the `-e`/`--encrypt` and
+`-i`/`--identity` flags. Plugins for which the concept of separate identities
+doesn't make sense (such as a password-encryption plugin) may instruct the user
+to use the `-j` flag.
+
+## EXIT STATUS
+
+`age` will exit 0 if and only if encryption or decryption are successful for the
+full length of the input.
+
+If an error occurs during decryption, partial output might still be generated,
+but only if it was possible to securely authenticate it. No unauthenticathed
+output is ever released.
+
+## BACKWARDS COMPATIBILITY
+
+Files encrypted with a stable version (not alpha, beta, or release candidate) of
+`age`, or with any v1.0.0 beta or release candidate, will decrypt with any later
+version of the tool.
+
+If decrypting older files poses a security risk, doing so might cause an error
+by default. In this case, a flag will be provided to force the operation.
+
 ## EXAMPLES
 
 Generate a new identity, encrypt data, and decrypt:
@@ -202,12 +276,32 @@ Encrypt and decrypt a file using a passphrase:
     $ age -d secrets.txt.age > secrets.txt
     Enter passphrase:
 
+Encrypt and decrypt with a passphrase-protected identity file:
+
+    $ age-keygen | age -p > key.age
+    Public key: age1yhm4gctwfmrpz87tdslm550wrx6m79y9f2hdzt0lndjnehwj0ukqrjpyx5
+    Enter passphrase (leave empty to autogenerate a secure one):
+    Using the autogenerated passphrase "hip-roast-boring-snake-mention-east-wasp-honey-input-actress".
+
+    $ age -r age1yhm4gctwfmrpz87tdslm550wrx6m79y9f2hdzt0lndjnehwj0ukqrjpyx5 secrets.txt > secrets.txt.age
+
+    $ age -d -i key.age secrets.txt.age > secrets.txt
+    Enter passphrase for identity file "key.age":
+
 Encrypt and decrypt with an SSH public key:
 
     $ age -R ~/.ssh/id_ed25519.pub example.jpg > example.jpg.age
 
     $ age -d -i ~/.ssh/id_ed25519 example.jpg.age > example.jpg
 
+Encrypt and decrypt with age-plugin-yubikey:
+
+    $ age-plugin-yubikey # run interactive setup, generate identity file and obtain recipient
+
+    $ age -r age1yubikey1qwt50d05nh5vutpdzmlg5wn80xq5negm4uj9ghv0snvdd3yysf5yw3rhl3t secrets.txt > secrets.txt.age
+
+    $ age -d -i age-yubikey-identity-388178f3.txt secrets.txt.age
+
 Encrypt to the SSH keys of a GitHub user:
 
     $ curl https://github.com/benjojo.keys | age -R - example.jpg > example.jpg.age

go.mod

@@ -1,9 +1,10 @@
 module filippo.io/age
 
-go 1.13
+go 1.17
 
 require (
-	filippo.io/edwards25519 v1.0.0-beta.3
-	golang.org/x/crypto v0.0.0-20201221181555-eec23a3978ad
-	golang.org/x/term v0.0.0-20201117132131-f5c789dd3221
+	filippo.io/edwards25519 v1.0.0-rc.1
+	golang.org/x/crypto v0.0.0-20210817164053-32db794688a5
+	golang.org/x/sys v0.0.0-20210903071746-97244b99971b
+	golang.org/x/term v0.0.0-20210615171337-6886f2dfbf5b
 )

go.sum

@@ -1,12 +1,14 @@
-filippo.io/edwards25519 v1.0.0-beta.3 h1:WQxB0FH5NzrhciInJ30bgL3soLng3AbdI651yQuVlCs=
-filippo.io/edwards25519 v1.0.0-beta.3/go.mod h1:X+pm78QAUPtFLi1z9PYIlS/bdDnvbCOGKtZ+ACWEf7o=
-golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
-golang.org/x/crypto v0.0.0-20201221181555-eec23a3978ad h1:DN0cp81fZ3njFcrLCytUHRSUkqBjfTo4Tx9RJTWs0EY=
-golang.org/x/crypto v0.0.0-20201221181555-eec23a3978ad/go.mod h1:jdWPYTVW3xRLrWPugEBEK3UY2ZEsg3UU495nc5E+M+I=
-golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
-golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
-golang.org/x/sys v0.0.0-20191026070338-33540a1f6037 h1:YyJpGZS1sBuBCzLAR1VEpK193GlqGZbnPFnPV/5Rsb4=
-golang.org/x/sys v0.0.0-20191026070338-33540a1f6037/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/term v0.0.0-20201117132131-f5c789dd3221 h1:/ZHdbVpdR/jk3g30/d4yUL0JU9kksj8+F/bnQUVLGDM=
-golang.org/x/term v0.0.0-20201117132131-f5c789dd3221/go.mod h1:Nr5EML6q2oocZ2LXRh80K7BxOlk5/8JxuGnuhpl+muw=
-golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+filippo.io/edwards25519 v1.0.0-rc.1 h1:m0VOOB23frXZvAOK44usCgLWvtsxIoMCTBGJZlpmGfU=
+filippo.io/edwards25519 v1.0.0-rc.1/go.mod h1:N1IkdkCkiLB6tki+MYJoSx2JTY9NUlxZE7eHn5EwJns=
+golang.org/x/crypto v0.0.0-20210817164053-32db794688a5 h1:HWj/xjIHfjYU5nVXpTM0s39J9CbLn7Cc5a7IC5rwsMQ=
+golang.org/x/crypto v0.0.0-20210817164053-32db794688a5/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
+golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
+golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20210903071746-97244b99971b h1:3Dq0eVHn0uaQJmPO+/aYPI/fRMqdrVDbu7MQcku54gg=
+golang.org/x/sys v0.0.0-20210903071746-97244b99971b/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
+golang.org/x/term v0.0.0-20210615171337-6886f2dfbf5b h1:9zKuko04nR4gjZ4+DNjHqRlAJqbJETHwiNKDqTfOjfE=
+golang.org/x/term v0.0.0-20210615171337-6886f2dfbf5b/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
+golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
+golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=

internal/bech32/bech32.go

@@ -1,5 +1,5 @@
 // Copyright (c) 2017 Takatoshi Nakagawa
-// Copyright (c) 2019 Google LLC
+// Copyright (c) 2019 The age Authors
 //
 // Permission is hereby granted, free of charge, to any person obtaining a copy
 // of this software and associated documentation files (the "Software"), to deal

internal/bech32/bech32_test.go

@@ -1,6 +1,6 @@
 // Copyright (c) 2013-2017 The btcsuite developers
 // Copyright (c) 2016-2017 The Lightning Network Developers
-// Copyright (c) 2019 Google LLC
+// Copyright (c) 2019 The age Authors
 //
 // Permission to use, copy, modify, and distribute this software for any
 // purpose with or without fee is hereby granted, provided that the above

internal/format/format.go

@@ -1,8 +1,6 @@
-// Copyright 2019 Google LLC
-//
+// Copyright 2019 The age Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file or at
-// https://developers.google.com/open-source/licenses/bsd
+// license that can be found in the LICENSE file.
 
 // Package format implements the age file format.
 package format
@@ -109,12 +107,11 @@ func (w *WrappedBase64Encoder) LastLineIsEmpty() bool {
 
 const intro = "age-encryption.org/v1\n"
 
-var recipientPrefix = []byte("->")
-
+var stanzaPrefix = []byte("->")
 var footerPrefix = []byte("---")
 
 func (r *Stanza) Marshal(w io.Writer) error {
-	if _, err := w.Write(recipientPrefix); err != nil {
+	if _, err := w.Write(stanzaPrefix); err != nil {
 		return err
 	}
 	for _, a := range append([]string{r.Type}, r.Args...) {
@@ -158,6 +155,67 @@ func (h *Header) Marshal(w io.Writer) error {
 	return err
 }
 
+type StanzaReader struct {
+	r   *bufio.Reader
+	err error
+}
+
+func NewStanzaReader(r *bufio.Reader) *StanzaReader {
+	return &StanzaReader{r: r}
+}
+
+func (r *StanzaReader) ReadStanza() (s *Stanza, err error) {
+	// Read errors are unrecoverable.
+	if r.err != nil {
+		return nil, r.err
+	}
+	defer func() { r.err = err }()
+
+	s = &Stanza{}
+
+	line, err := r.r.ReadBytes('\n')
+	if err != nil {
+		return nil, fmt.Errorf("failed to read line: %v", err)
+	}
+	if !bytes.HasPrefix(line, stanzaPrefix) {
+		return nil, fmt.Errorf("malformed stanza opening line: %q", line)
+	}
+	prefix, args := splitArgs(line)
+	if prefix != string(stanzaPrefix) || len(args) < 1 {
+		return nil, fmt.Errorf("malformed stanza: %q", line)
+	}
+	for _, a := range args {
+		if !isValidString(a) {
+			return nil, fmt.Errorf("malformed stanza: %q", line)
+		}
+	}
+	s.Type = args[0]
+	s.Args = args[1:]
+
+	for {
+		line, err := r.r.ReadBytes('\n')
+		if err != nil {
+			return nil, fmt.Errorf("failed to read line: %v", err)
+		}
+
+		b, err := DecodeString(strings.TrimSuffix(string(line), "\n"))
+		if err != nil {
+			if bytes.HasPrefix(line, footerPrefix) || bytes.HasPrefix(line, stanzaPrefix) {
+				return nil, fmt.Errorf("malformed body line %q: stanza ended without a short line\nNote: this might be a file encrypted with an old beta version of age or rage. Use age v1.0.0-beta6 or rage to decrypt it.", line)
+			}
+			return nil, errorf("malformed body line %q: %v", line, err)
+		}
+		if len(b) > BytesPerLine {
+			return nil, errorf("malformed body line %q: too long", line)
+		}
+		s.Body = append(s.Body, b...)
+		if len(b) < BytesPerLine {
+			// A stanza body always ends with a short line.
+			return s, nil
+		}
+	}
+}
+
 type ParseError string
 
 func (e ParseError) Error() string {
@@ -182,17 +240,19 @@ func Parse(input io.Reader) (*Header, io.Reader, error) {
 		return nil, nil, errorf("unexpected intro: %q", line)
 	}
 
-	var r *Stanza
+	sr := NewStanzaReader(rr)
 	for {
-		line, err := rr.ReadBytes('\n')
+		peek, err := rr.Peek(len(footerPrefix))
 		if err != nil {
 			return nil, nil, errorf("failed to read header: %v", err)
 		}
 
-		if bytes.HasPrefix(line, footerPrefix) {
-			if r != nil {
-				return nil, nil, errorf("malformed body line %q: reached footer without previous stanza being closed\nNote: this might be a file encrypted with an old beta version of rage. Use rage to decrypt it.", line)
+		if bytes.Equal(peek, footerPrefix) {
+			line, err := rr.ReadBytes('\n')
+			if err != nil {
+				return nil, nil, fmt.Errorf("failed to read header: %v", err)
 			}
+
 			prefix, args := splitArgs(line)
 			if prefix != string(footerPrefix) || len(args) != 1 {
 				return nil, nil, errorf("malformed closing line: %q", line)
@@ -202,42 +262,13 @@ func Parse(input io.Reader) (*Header, io.Reader, error) {
 				return nil, nil, errorf("malformed closing line %q: %v", line, err)
 			}
 			break
-
-		} else if bytes.HasPrefix(line, recipientPrefix) {
-			if r != nil {
-				return nil, nil, errorf("malformed body line %q: new stanza started without previous stanza being closed\nNote: this might be a file encrypted with an old beta version of rage. Use rage to decrypt it.", line)
-			}
-			r = &Stanza{}
-			prefix, args := splitArgs(line)
-			if prefix != string(recipientPrefix) || len(args) < 1 {
-				return nil, nil, errorf("malformed recipient: %q", line)
-			}
-			for _, a := range args {
-				if !isValidString(a) {
-					return nil, nil, errorf("malformed recipient: %q", line)
-				}
-			}
-			r.Type = args[0]
-			r.Args = args[1:]
-			h.Recipients = append(h.Recipients, r)
-
-		} else if r != nil {
-			b, err := DecodeString(strings.TrimSuffix(string(line), "\n"))
-			if err != nil {
-				return nil, nil, errorf("malformed body line %q: %v", line, err)
-			}
-			if len(b) > BytesPerLine {
-				return nil, nil, errorf("malformed body line %q: too long", line)
-			}
-			r.Body = append(r.Body, b...)
-			if len(b) < BytesPerLine {
-				// Only the last line of a body can be short.
-				r = nil
-			}
-
-		} else {
-			return nil, nil, errorf("unexpected line: %q", line)
 		}
+
+		s, err := sr.ReadStanza()
+		if err != nil {
+			return nil, nil, fmt.Errorf("failed to parse header: %v", err)
+		}
+		h.Recipients = append(h.Recipients, s)
 	}
 
 	// If input is a bufio.Reader, rr might be equal to input because

internal/format/format_test.go

@@ -1,8 +1,6 @@
-// Copyright 2021 Google LLC
-//
+// Copyright 2021 The age Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file or at
-// https://developers.google.com/open-source/licenses/bsd
+// license that can be found in the LICENSE file.
 
 package format_test
 

internal/plugin/client.go

@@ -0,0 +1,433 @@
+// Copyright 2021 Google LLC
+//
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file or at
+// https://developers.google.com/open-source/licenses/bsd
+
+// Package plugin implements the age plugin protocol.
+package plugin
+
+import (
+	"bufio"
+	"bytes"
+	"fmt"
+	"io"
+	"os"
+	"strconv"
+	"strings"
+	"time"
+
+	exec "golang.org/x/sys/execabs"
+
+	"filippo.io/age"
+	"filippo.io/age/internal/bech32"
+	"filippo.io/age/internal/format"
+)
+
+type Recipient struct {
+	name     string
+	encoding string
+	ui       *ClientUI
+
+	// identity is true when encoding is an identity string.
+	identity bool
+}
+
+var _ age.Recipient = &Recipient{}
+
+func NewRecipient(s string, ui *ClientUI) (*Recipient, error) {
+	hrp, _, err := bech32.Decode(s)
+	if err != nil {
+		return nil, fmt.Errorf("invalid recipient encoding %q: %v", s, err)
+	}
+	if !strings.HasPrefix(hrp, "age1") {
+		return nil, fmt.Errorf("not a plugin recipient %q: %v", s, err)
+	}
+	name := strings.TrimPrefix(hrp, "age1")
+	return &Recipient{
+		name: name, encoding: s, ui: ui,
+	}, nil
+}
+
+// Name returns the plugin name, which is used in the recipient ("age1name1...")
+// and identity ("AGE-PLUGIN-NAME-1...") encodings, as well as in the plugin
+// binary name ("age-plugin-name").
+func (r *Recipient) Name() string {
+	return r.name
+}
+
+func (r *Recipient) Wrap(fileKey []byte) (stanzas []*age.Stanza, err error) {
+	defer func() {
+		if err != nil {
+			err = fmt.Errorf("%s plugin: %w", r.name, err)
+		}
+	}()
+
+	conn, err := openClientConnection(r.name, "recipient-v1")
+	if err != nil {
+		return nil, fmt.Errorf("couldn't start plugin: %v", err)
+	}
+	defer conn.Close()
+
+	// Phase 1: client sends recipient or identity and file key
+	addType := "add-recipient"
+	if r.identity {
+		addType = "add-identity"
+	}
+	if err := writeStanza(conn, addType, r.encoding); err != nil {
+		return nil, err
+	}
+	if err := writeStanzaWithBody(conn, "wrap-file-key", fileKey); err != nil {
+		return nil, err
+	}
+	if err := writeStanza(conn, "done"); err != nil {
+		return nil, err
+	}
+
+	// Phase 2: plugin responds with stanzas
+	sr := format.NewStanzaReader(bufio.NewReader(conn))
+ReadLoop:
+	for {
+		s, err := r.ui.readStanza(r.name, sr)
+		if err != nil {
+			return nil, err
+		}
+
+		switch s.Type {
+		case "recipient-stanza":
+			if len(s.Args) < 2 {
+				return nil, fmt.Errorf("malformed recipient stanza: unexpected argument count")
+			}
+			n, err := strconv.Atoi(s.Args[0])
+			if err != nil {
+				return nil, fmt.Errorf("malformed recipient stanza: invalid index")
+			}
+			// We only send a single file key, so the index must be 0.
+			if n != 0 {
+				return nil, fmt.Errorf("malformed recipient stanza: unexpected index")
+			}
+
+			stanzas = append(stanzas, &age.Stanza{
+				Type: s.Args[1],
+				Args: s.Args[2:],
+				Body: s.Body,
+			})
+
+			if err := writeStanza(conn, "ok"); err != nil {
+				return nil, err
+			}
+		case "error":
+			if err := writeStanza(conn, "ok"); err != nil {
+				return nil, err
+			}
+
+			return nil, fmt.Errorf("%s", s.Body)
+		case "done":
+			break ReadLoop
+		default:
+			if ok, err := r.ui.handle(r.name, conn, s); err != nil {
+				return nil, err
+			} else if !ok {
+				if err := writeStanza(conn, "unsupported"); err != nil {
+					return nil, err
+				}
+			}
+		}
+	}
+
+	if len(stanzas) == 0 {
+		return nil, fmt.Errorf("received zero recipient stanzas")
+	}
+
+	return stanzas, nil
+}
+
+type Identity struct {
+	name     string
+	encoding string
+	ui       *ClientUI
+}
+
+var _ age.Identity = &Identity{}
+
+func NewIdentity(s string, ui *ClientUI) (*Identity, error) {
+	hrp, _, err := bech32.Decode(s)
+	if err != nil {
+		return nil, fmt.Errorf("invalid identity encoding: %v", err)
+	}
+	if !strings.HasPrefix(hrp, "AGE-PLUGIN-") || !strings.HasSuffix(hrp, "-") {
+		return nil, fmt.Errorf("not a plugin identity: %v", err)
+	}
+	name := strings.TrimSuffix(strings.TrimPrefix(hrp, "AGE-PLUGIN-"), "-")
+	name = strings.ToLower(name)
+	return &Identity{
+		name: name, encoding: s, ui: ui,
+	}, nil
+}
+
+func NewIdentityWithoutData(name string, ui *ClientUI) (*Identity, error) {
+	s, err := bech32.Encode("AGE-PLUGIN-"+strings.ToUpper(name)+"-", nil)
+	if err != nil {
+		return nil, err
+	}
+	return &Identity{
+		name: name, encoding: s, ui: ui,
+	}, nil
+}
+
+// Name returns the plugin name, which is used in the recipient ("age1name1...")
+// and identity ("AGE-PLUGIN-NAME-1...") encodings, as well as in the plugin
+// binary name ("age-plugin-name").
+func (i *Identity) Name() string {
+	return i.name
+}
+
+// Recipient returns a Recipient wrapping this identity. When that Recipient is
+// used to encrypt a file key, the identity encoding is provided as-is to the
+// plugin, which is expected to support encrypting to identities.
+func (i *Identity) Recipient() *Recipient {
+	return &Recipient{
+		name:     i.name,
+		encoding: i.encoding,
+		identity: true,
+		ui:       i.ui,
+	}
+}
+
+func (i *Identity) Unwrap(stanzas []*age.Stanza) (fileKey []byte, err error) {
+	defer func() {
+		if err != nil {
+			err = fmt.Errorf("%s plugin: %w", i.name, err)
+		}
+	}()
+
+	conn, err := openClientConnection(i.name, "identity-v1")
+	if err != nil {
+		return nil, fmt.Errorf("couldn't start plugin: %v", err)
+	}
+	defer conn.Close()
+
+	// Phase 1: client sends the plugin the identity string and the stanzas
+	if err := writeStanza(conn, "add-identity", i.encoding); err != nil {
+		return nil, err
+	}
+	for _, rs := range stanzas {
+		s := &format.Stanza{
+			Type: "recipient-stanza",
+			Args: append([]string{"0", rs.Type}, rs.Args...),
+			Body: rs.Body,
+		}
+		if err := s.Marshal(conn); err != nil {
+			return nil, err
+		}
+	}
+	if err := writeStanza(conn, "done"); err != nil {
+		return nil, err
+	}
+
+	// Phase 2: plugin responds with various commands and a file key
+	sr := format.NewStanzaReader(bufio.NewReader(conn))
+ReadLoop:
+	for {
+		s, err := i.ui.readStanza(i.name, sr)
+		if err != nil {
+			return nil, err
+		}
+
+		switch s.Type {
+		case "file-key":
+			if len(s.Args) != 1 {
+				return nil, fmt.Errorf("malformed file-key stanza: unexpected arguments count")
+			}
+			n, err := strconv.Atoi(s.Args[0])
+			if err != nil {
+				return nil, fmt.Errorf("malformed file-key stanza: invalid index")
+			}
+			// We only send a single file key, so the index must be 0.
+			if n != 0 {
+				return nil, fmt.Errorf("malformed file-key stanza: unexpected index")
+			}
+			if fileKey != nil {
+				return nil, fmt.Errorf("received duplicated file-key stanza")
+			}
+
+			fileKey = s.Body
+
+			if err := writeStanza(conn, "ok"); err != nil {
+				return nil, err
+			}
+		case "error":
+			if err := writeStanza(conn, "ok"); err != nil {
+				return nil, err
+			}
+
+			return nil, fmt.Errorf("%s", s.Body)
+		case "done":
+			break ReadLoop
+		default:
+			if ok, err := i.ui.handle(i.name, conn, s); err != nil {
+				return nil, err
+			} else if !ok {
+				if err := writeStanza(conn, "unsupported"); err != nil {
+					return nil, err
+				}
+			}
+		}
+	}
+
+	if fileKey == nil {
+		return nil, age.ErrIncorrectIdentity
+	}
+	return fileKey, nil
+}
+
+// ClientUI holds callbacks that will be invoked by (Un)Wrap if the plugin
+// wishes to interact with the user. If any of them is nil or returns an error,
+// failure will be reported to the plugin, but note that the error is otherwise
+// discarded. Implementations are encouraged to display errors to the user
+// before returning them.
+type ClientUI struct {
+	// DisplayMessage displays the message, which is expected to have lowercase
+	// initials and no final period.
+	DisplayMessage func(name, message string) error
+
+	// RequestValue requests a secret or public input, with the provided prompt.
+	RequestValue func(name, prompt string, secret bool) (string, error)
+
+	// Confirm requests a confirmation with the provided prompt. The yes and no
+	// value are the choices provided to the user. no may be empty. The return
+	// value indicates whether the user selected the yes or no option.
+	Confirm func(name, prompt, yes, no string) (choseYes bool, err error)
+
+	// WaitTimer is invoked once (Un)Wrap has been waiting for 5 seconds on the
+	// plugin, for example because the plugin is waiting for an external event
+	// (e.g. a hardware token touch). Unlike the other callbacks, WaitTimer runs
+	// in a separate goroutine, and if missing it's simply ignored.
+	WaitTimer func(name string)
+}
+
+func (c *ClientUI) handle(name string, conn *clientConnection, s *format.Stanza) (ok bool, err error) {
+	switch s.Type {
+	case "msg":
+		if c.DisplayMessage == nil {
+			return true, writeStanza(conn, "fail")
+		}
+		if err := c.DisplayMessage(name, string(s.Body)); err != nil {
+			return true, writeStanza(conn, "fail")
+		}
+		return true, writeStanza(conn, "ok")
+	case "request-secret", "request-public":
+		if c.RequestValue == nil {
+			return true, writeStanza(conn, "fail")
+		}
+		secret, err := c.RequestValue(name, string(s.Body), s.Type == "request-secret")
+		if err != nil {
+			return true, writeStanza(conn, "fail")
+		}
+		return true, writeStanzaWithBody(conn, "ok", []byte(secret))
+	case "confirm":
+		if len(s.Args) != 1 && len(s.Args) != 2 {
+			return true, fmt.Errorf("malformed confirm stanza: unexpected number of arguments")
+		}
+		if c.Confirm == nil {
+			return true, writeStanza(conn, "fail")
+		}
+		yes, err := format.DecodeString(s.Args[0])
+		if err != nil {
+			return true, fmt.Errorf("malformed confirm stanza: invalid YES option encoding")
+		}
+		var no []byte
+		if len(s.Args) == 2 {
+			no, err = format.DecodeString(s.Args[1])
+			if err != nil {
+				return true, fmt.Errorf("malformed confirm stanza: invalid NO option encoding")
+			}
+		}
+		choseYes, err := c.Confirm(name, string(s.Body), string(yes), string(no))
+		if err != nil {
+			return true, writeStanza(conn, "fail")
+		}
+		result := "yes"
+		if !choseYes {
+			result = "no"
+		}
+		return true, writeStanza(conn, "ok", result)
+	default:
+		return false, nil
+	}
+}
+
+// readStanza calls r.ReadStanza and, if set, invokes WaitTimer in a separate
+// goroutine if the call takes longer than 5 seconds.
+func (c *ClientUI) readStanza(name string, r *format.StanzaReader) (*format.Stanza, error) {
+	if c.WaitTimer != nil {
+		defer time.AfterFunc(5*time.Second, func() { c.WaitTimer(name) }).Stop()
+	}
+	return r.ReadStanza()
+}
+
+type clientConnection struct {
+	cmd       *exec.Cmd
+	io.Reader // stdout
+	io.Writer // stdin
+	stderr    bytes.Buffer
+	close     func()
+}
+
+func openClientConnection(name, protocol string) (*clientConnection, error) {
+	cmd := exec.Command("age-plugin-"+name, "--age-plugin="+protocol)
+
+	stdout, err := cmd.StdoutPipe()
+	if err != nil {
+		return nil, err
+	}
+	stdin, err := cmd.StdinPipe()
+	if err != nil {
+		return nil, err
+	}
+
+	cc := &clientConnection{
+		cmd:    cmd,
+		Reader: stdout,
+		Writer: stdin,
+		close: func() {
+			stdin.Close()
+			stdout.Close()
+		},
+	}
+
+	if os.Getenv("AGEDEBUG") == "plugin" {
+		cc.Reader = io.TeeReader(cc.Reader, os.Stderr)
+		cc.Writer = io.MultiWriter(cc.Writer, os.Stderr)
+		cmd.Stderr = os.Stderr
+	}
+
+	// We don't want the plugins to rely on the working directory for anything
+	// as different clients might treat it differently, so we set it to an empty
+	// temporary directory.
+	cmd.Dir = os.TempDir()
+
+	if err := cmd.Start(); err != nil {
+		return nil, err
+	}
+
+	return cc, nil
+}
+
+func (cc *clientConnection) Close() error {
+	// Close stdin and stdout and send SIGINT (if supported) to the plugin,
+	// then wait for it to cleanup and exit.
+	cc.close()
+	cc.cmd.Process.Signal(os.Interrupt)
+	return cc.cmd.Wait()
+}
+
+func writeStanza(conn io.Writer, t string, args ...string) error {
+	s := &format.Stanza{Type: t, Args: args}
+	return s.Marshal(conn)
+}
+
+func writeStanzaWithBody(conn io.Writer, t string, body []byte) error {
+	s := &format.Stanza{Type: t, Body: body}
+	return s.Marshal(conn)
+}

internal/stream/stream.go

@@ -1,8 +1,6 @@
-// Copyright 2019 Google LLC
-//
+// Copyright 2019 The age Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file or at
-// https://developers.google.com/open-source/licenses/bsd
+// license that can be found in the LICENSE file.
 
 // Package stream implements a variant of the STREAM chunked encryption scheme.
 package stream
@@ -89,7 +87,11 @@ func (r *Reader) readChunk() (last bool, err error) {
 		// A message can't end without a marked chunk. This message is truncated.
 		return false, io.ErrUnexpectedEOF
 	case err == io.ErrUnexpectedEOF:
-		// The last chunk can be short.
+		// The last chunk can be short, but not empty unless it's the first and
+		// only chunk.
+		if !nonceIsZero(&r.nonce) && n == r.a.Overhead() {
+			return false, errors.New("last chunk is empty, try age v1.0.0, and please consider reporting this")
+		}
 		in = in[:n]
 		last = true
 		setLastChunkFlag(&r.nonce)
@@ -130,6 +132,10 @@ func setLastChunkFlag(nonce *[chacha20poly1305.NonceSize]byte) {
 	nonce[len(nonce)-1] = lastChunkFlag
 }
 
+func nonceIsZero(nonce *[chacha20poly1305.NonceSize]byte) bool {
+	return *nonce == [chacha20poly1305.NonceSize]byte{}
+}
+
 type Writer struct {
 	a         cipher.AEAD
 	dst       io.Writer

internal/stream/stream_test.go

@@ -1,8 +1,6 @@
-// Copyright 2019 Google LLC
-//
+// Copyright 2019 The age Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file or at
-// https://developers.google.com/open-source/licenses/bsd
+// license that can be found in the LICENSE file.
 
 package stream_test
 
@@ -81,10 +79,6 @@ func testRoundTrip(t *testing.T, stepSize, length int) {
 	n = 0
 	readBuf := make([]byte, stepSize)
 	for n < length {
-		b := length - n
-		if b > stepSize {
-			b = stepSize
-		}
 		nn, err := r.Read(readBuf)
 		if err != nil {
 			t.Fatalf("Read error at index %d: %v", n, err)

logo/README.md

@@ -0,0 +1,12 @@
+The logos available in this folder are Copyright 2021 Filippo Valsorda.
+
+Permission is granted to use the logos as long as they are unaltered, are not
+combined with other text or graphic, and are not used to imply your project is
+endorsed by or affiliated with the age project.
+
+This permission can be revoked or rescinded for any reason and at any time,
+selectively or otherwise.
+
+If you require different terms, please email age-logo@filippo.io.
+
+The logos were designed by [Studiovagante](https://www.studiovagante.it).

logo/logo.svg

@@ -0,0 +1,579 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Generator: Adobe Illustrator 23.0.3, SVG Export Plug-In . SVG Version: 6.00 Build 0)  -->
+<svg version="1.1" id="Livello_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
+	 viewBox="0 0 298.9 141.89" style="enable-background:new 0 0 298.9 141.89;" xml:space="preserve">
+<g>
+	<g>
+		<path d="M160.3,88.5c-0.86,0-1.29-0.43-1.29-1.29v-5.94c-3.01,4.22-7.83,8.09-14.81,8.09c-11.71,0-19.8-10.07-19.8-22.38
+			c0-12.31,8.09-22.38,19.8-22.38c6.89,0,11.62,3.61,14.81,8.18v-6.03c0-0.86,0.43-1.29,1.29-1.29h7.14c0.86,0,1.29,0.43,1.29,1.29
+			v40.46c0,0.86-0.43,1.29-1.29,1.29H160.3z M146.7,80.07c7.14,0,12.48-5.85,12.48-13.08c0-7.23-5.34-13.08-12.48-13.08
+			c-7.23,0-12.57,5.85-12.57,13.08C134.13,74.21,139.47,80.07,146.7,80.07z"/>
+		<path d="M223.74,86.95c0,13.51-9.64,23.5-23.33,23.5c-7.14,0-13.6-2.93-17.39-6.8c-0.52-0.52-0.52-1.12-0.09-1.72l3.79-4.99
+			c0.26-0.34,0.6-0.52,0.86-0.52c0.26,0,0.52,0.17,0.77,0.34c2.84,2.67,6.97,4.39,11.79,4.39c9.12,0,13.86-6.2,13.86-13.34v-6.97
+			c-3.01,4.22-7.75,8.09-14.89,8.09c-11.62,0-19.71-9.73-19.71-22.03s8.09-22.29,19.71-22.29c6.89,0,11.71,3.61,14.89,8.18v-6.03
+			c0-0.86,0.43-1.29,1.29-1.29h7.14c0.86,0,1.29,0.43,1.29,1.29V86.95z M201.7,79.64c7.23,0,12.57-5.42,12.57-12.74
+			c0-7.32-5.34-13-12.57-13c-7.23,0-12.57,5.85-12.57,13C189.13,74.21,194.47,79.64,201.7,79.64z"/>
+		<path d="M267.64,78.35c0.26-0.17,0.6-0.26,0.86-0.26c0.43,0,0.77,0.26,1.03,0.6l3.18,4.56c0.43,0.77,0.34,1.29-0.34,1.72
+			c-4.22,2.67-9.38,4.39-15.92,4.39c-12.22,0-22.04-10.07-22.04-22.38c0-11.71,8.18-22.38,20.92-22.38
+			c13.43,0,21.17,11.02,21.17,24.19c0,0.95-0.43,1.55-1.46,1.55h-31.42c1.12,5.85,6.02,10.76,13.08,10.76
+			C261.18,81.1,264.28,80.15,267.64,78.35z M267.21,63.2c-1.38-6.54-5.25-10.93-11.88-10.93c-6.2,0-10.5,4.3-11.62,10.93H267.21z"/>
+	</g>
+	<g>
+		<g>
+			<path d="M142.92,126.01c-0.12,0-0.18-0.06-0.18-0.16v-7.36c0-0.11,0.06-0.16,0.18-0.16h5.26c0.12,0,0.18,0.06,0.18,0.16v0.9
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+			<path d="M171.38,118.32c0.13,0,0.18,0.08,0.18,0.16v0.9c0,0.11-0.06,0.16-0.18,0.16h-3.64v2.02h3.21c0.12,0,0.18,0.06,0.18,0.16
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+				c-0.12,0-0.18-0.06-0.18-0.16v-7.36c0-0.11,0.06-0.16,0.18-0.16H171.38z"/>
+			<path d="M187.4,118.32c0.13,0,0.18,0.08,0.18,0.16v0.9c0,0.11-0.06,0.16-0.18,0.16h-3.64v2.02h3.21c0.12,0,0.18,0.06,0.18,0.16
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+				H214.81z"/>
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parse.go

@@ -1,8 +1,6 @@
-// Copyright 2021 Google LLC
-//
+// Copyright 2021 The age Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file or at
-// https://developers.google.com/open-source/licenses/bsd
+// license that can be found in the LICENSE file.
 
 package age
 

primitives.go

@@ -1,8 +1,6 @@
-// Copyright 2019 Google LLC
-//
+// Copyright 2019 The age Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file or at
-// https://developers.google.com/open-source/licenses/bsd
+// license that can be found in the LICENSE file.
 
 package age
 

recipients_test.go

@@ -1,8 +1,6 @@
-// Copyright 2019 Google LLC
-//
+// Copyright 2019 The age Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file or at
-// https://developers.google.com/open-source/licenses/bsd
+// license that can be found in the LICENSE file.
 
 package age_test
 

scrypt.go

@@ -1,8 +1,6 @@
-// Copyright 2019 Google LLC
-//
+// Copyright 2019 The age Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file or at
-// https://developers.google.com/open-source/licenses/bsd
+// license that can be found in the LICENSE file.
 
 package age
 
@@ -122,6 +120,11 @@ func (i *ScryptIdentity) SetMaxWorkFactor(logN int) {
 }
 
 func (i *ScryptIdentity) Unwrap(stanzas []*Stanza) ([]byte, error) {
+	for _, s := range stanzas {
+		if s.Type == "scrypt" && len(stanzas) != 1 {
+			return nil, errors.New("an scrypt recipient must be the only one")
+		}
+	}
 	return multiUnwrap(i.unwrap, stanzas)
 }
 

x25519.go

@@ -1,8 +1,6 @@
-// Copyright 2019 Google LLC
-//
+// Copyright 2019 The age Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file or at
-// https://developers.google.com/open-source/licenses/bsd
+// license that can be found in the LICENSE file.
 
 package age