Reland of Update SCT serialization format in Expect-CT reports

net/cert/ct_serialization.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 <stdint.h>
 
 #include <algorithm>
 #include <limits>
@@ skipping 410 matching lines @@
       !DecodeDigitallySigned(input, &result->signature)) {
     return false;
   }
 
   log_id.CopyToString(&result->log_id);
   extensions.CopyToString(&result->extensions);
   output->swap(result);
   return true;
 }
 
+void EncodeSignedCertificateTimestamp(
+    const scoped_refptr<ct::SignedCertificateTimestamp>& input,
+    std::string* output) {
+  // This function only supports serialization of V1 SCTs.
+  DCHECK_EQ(SignedCertificateTimestamp::V1, input->version);
+  WriteUint(kVersionLength, input->version, output);
+  DCHECK_EQ(kLogIdLength, input->log_id.size());
+  WriteEncodedBytes(
+      base::StringPiece(reinterpret_cast<const char*>(input->log_id.data()),
+                        kLogIdLength),
+      output);
+  WriteTimeSinceEpoch(input->timestamp, output);
+  WriteVariableBytes(kExtensionsLengthBytes, input->extensions, output);
+  EncodeDigitallySigned(input->signature, output);
+}
+
 bool EncodeSCTListForTesting(const base::StringPiece& sct,
                              std::string* output) {
   std::string encoded_sct;
   return WriteVariableBytes(kSerializedSCTLengthBytes, sct, &encoded_sct) &&
          WriteVariableBytes(kSCTListLengthBytes, encoded_sct, output);
 }
 
 }  // namespace ct
 
 }  // namespace net