From 4176302a03fced0b3ba90e7f910c7fb2e28153cc Mon Sep 17 00:00:00 2001
From: Adrien Beraud <adrien.beraud@savoirfairelinux.com>
Date: Tue, 7 Mar 2017 15:46:24 +0100
Subject: [PATCH] crypto: add PublicKey::toString()

---
 include/opendht/crypto.h |  2 ++
 src/crypto.cpp           | 16 ++++++++++++++++
 2 files changed, 18 insertions(+)

diff --git a/include/opendht/crypto.h b/include/opendht/crypto.h
index 7d9c8f2f..d8c9a9c1 100644
--- a/include/opendht/crypto.h
+++ b/include/opendht/crypto.h
@@ -90,6 +90,8 @@ struct OPENDHT_PUBLIC PublicKey
     void pack(Blob& b) const;
     void unpack(const uint8_t* dat, size_t dat_size);
 
+    std::string toString() const;
+
     template <typename Packer>
     void msgpack_pack(Packer& p) const
     {
diff --git a/src/crypto.cpp b/src/crypto.cpp
index 80c1dc80..14337ad3 100644
--- a/src/crypto.cpp
+++ b/src/crypto.cpp
@@ -426,6 +426,22 @@ PublicKey::unpack(const uint8_t* data, size_t data_size)
         throw CryptoException(std::string("Could not read public key: ") + gnutls_strerror(err));
 }
 
+std::string
+PublicKey::toString() const
+{
+    std::string ret;
+    size_t sz = ret.size();
+    int err = gnutls_pubkey_export(pk, GNUTLS_X509_FMT_PEM, (void*)ret.data(), &sz);
+    if (err ==  GNUTLS_E_SHORT_MEMORY_BUFFER) {
+        ret.resize(sz);
+        int err = gnutls_pubkey_export(pk, GNUTLS_X509_FMT_PEM, (void*)ret.data(), &sz);
+        if (err != GNUTLS_E_SUCCESS)
+            throw CryptoException(std::string("Could not print public key: ") + gnutls_strerror(err));
+    } else if (err != GNUTLS_E_SUCCESS)
+        throw CryptoException(std::string("Could not print public key: ") + gnutls_strerror(err));
+    return ret;
+}
+
 void
 PublicKey::msgpack_unpack(msgpack::object o)
 {