Certificate Transparency: Parse Signed Tree Heads and validate them

net/cert/ct_serialization_unittest.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/cert/ct_serialization.h"
 
 #include <string>
 
 #include "base/file_util.h"
 #include "base/files/file_path.h"
@@ skipping 144 matching lines @@
 
   ASSERT_FALSE(
       ct::DecodeSignedCertificateTimestamp(&invalid_version_sct, &sct));
 
   // Valid version, invalid length (missing data)
   base::StringPiece invalid_length_sct("\x0\xa\xb\xc", 4);
   ASSERT_FALSE(
       ct::DecodeSignedCertificateTimestamp(&invalid_length_sct, &sct));
 }
 
+TEST_F(CtSerializationTest, EncodesValidSignedTreeHead) {
+  ct::SignedTreeHead signed_tree_head;
+  GetSignedTreeHead(&signed_tree_head);
+
+  std::string encoded;
+  ct::EncodeTreeHeadSignature(signed_tree_head, &encoded);
+  // Expected size is 50 bytes:
+  // Byte 0 is version, byte 1 is signature type
+  // Bytes 2-9 are timestamp
+  // Bytes 10-17 are tree size
+  // Bytes 18-49 are sha256 root hash
+  ASSERT_EQ(50u, encoded.length());
+  std::string expected_buffer(
+      "\x0\x1\x0\x0\x1\x45\x3c\x5f\xb8\x35\x0\x0\x0\x0\x0\x0\x0\x15", 18);
+  expected_buffer.append(ct::GetSampleSTHSHA256RootHash());
+  ASSERT_EQ(expected_buffer, encoded);
+}
+
 }  // namespace net