Add QUIC 31 in which the server's proof covers both the static server config as well as a hash of t…

net/quic/crypto/crypto_utils.cc

Index: net/quic/crypto/crypto_utils.cc
diff --git a/net/quic/crypto/crypto_utils.cc b/net/quic/crypto/crypto_utils.cc
index 8843e2c692bf825513cec5e591b5917eb6f7f99b..2b22acd9930610f37a0ac6e9fed9e5cb5e8bbb0e 100644
--- a/net/quic/crypto/crypto_utils.cc
+++ b/net/quic/crypto/crypto_utils.cc
@@ -5,6 +5,7 @@
 #include "net/quic/crypto/crypto_utils.h"
 
 #include "crypto/hkdf.h"
+#include "crypto/secure_hash.h"
 #include "net/base/url_util.h"
 #include "net/quic/crypto/crypto_handshake.h"
 #include "net/quic/crypto/crypto_protocol.h"
@@ -274,4 +275,16 @@ const char* CryptoUtils::HandshakeFailureReasonToString(
   return "INVALID_HANDSHAKE_FAILURE_REASON";
 }
 
+// static
+void CryptoUtils::HashHandshakeMessage(const CryptoHandshakeMessage& message,
+                                       string* output) {
+  const QuicData& serialized = message.GetSerialized();
+  scoped_ptr<crypto::SecureHash> hash(
+      crypto::SecureHash::Create(crypto::SecureHash::SHA256));
+  hash->Update(serialized.data(), serialized.length());
+  uint8_t digest[32];
+  hash->Finish(digest, sizeof(digest));
+  output->assign(reinterpret_cast<const char*>(&digest), sizeof(digest));
+}
+
 }  // namespace net