From 47133c6f3131f8007340b72dc48d637997e800f4 Mon Sep 17 00:00:00 2001
From: Sebastian Stenzel <sebastian.stenzel@gmail.com>
Date: Wed, 14 Sep 2016 17:22:26 +0200
Subject: [PATCH] fixed change pw function leaving invalid JSON file if length
 gets shorter due to different encoding or pretty printing etc

---
 .../main/java/org/cryptomator/filesystem/crypto/Masterkeys.java  | 1 +
 1 file changed, 1 insertion(+)

diff --git a/main/filesystem-crypto/src/main/java/org/cryptomator/filesystem/crypto/Masterkeys.java b/main/filesystem-crypto/src/main/java/org/cryptomator/filesystem/crypto/Masterkeys.java
index 9e8578dc2..98b488836 100644
--- a/main/filesystem-crypto/src/main/java/org/cryptomator/filesystem/crypto/Masterkeys.java
+++ b/main/filesystem-crypto/src/main/java/org/cryptomator/filesystem/crypto/Masterkeys.java
@@ -103,6 +103,7 @@ class Masterkeys {
 
 	private static void writeMasterKey(File file, Cryptor cryptor, CharSequence passphrase) throws UncheckedIOException {
 		try (WritableFile writable = file.openWritable()) {
+			writable.truncate();
 			final byte[] fileContents = cryptor.writeKeysToMasterkeyFile(passphrase);
 			writable.write(ByteBuffer.wrap(fileContents));
 		}