Roll Chrome into Mojo.

net/quic/crypto/null_decrypter.cc

 // Copyright (c) 2012 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/quic/crypto/null_decrypter.h"
 #include "net/quic/quic_utils.h"
 #include "net/quic/quic_data_reader.h"
 
 using base::StringPiece;
 using std::string;
 
 namespace net {
 
 NullDecrypter::NullDecrypter() {}
 
 bool NullDecrypter::SetKey(StringPiece key) { return key.empty(); }
 
 bool NullDecrypter::SetNoncePrefix(StringPiece nonce_prefix) {
   return nonce_prefix.empty();
 }
 
-bool NullDecrypter::Decrypt(StringPiece /*nonce*/,
-                            StringPiece associated_data,
-                            StringPiece ciphertext,
-                            unsigned char* output,
-                            size_t* output_length) {
-  QuicDataReader reader(ciphertext.data(), ciphertext.length());
-
-  uint128 hash;
-  if (!ReadHash(&reader, &hash)) {
-    return false;
-  }
-
-  StringPiece plaintext = reader.ReadRemainingPayload();
-
-  // TODO(rch): avoid buffer copy here
-  string buffer = associated_data.as_string();
-  plaintext.AppendToString(&buffer);
-  if (hash != ComputeHash(buffer)) {
-    return false;
-  }
-  memcpy(output, plaintext.data(), plaintext.length());
-  *output_length = plaintext.length();
-  return true;
-}
-
 QuicData* NullDecrypter::DecryptPacket(QuicPacketSequenceNumber /*seq_number*/,
                                        StringPiece associated_data,
                                        StringPiece ciphertext) {
   // It's worth duplicating |Decrypt|, above, in order to save a copy by using
   // the shared-data QuicData constructor directly.
   QuicDataReader reader(ciphertext.data(), ciphertext.length());
 
   uint128 hash;
   if (!ReadHash(&reader, &hash)) {
     return nullptr;
@@ skipping 30 matching lines @@
 
 uint128 NullDecrypter::ComputeHash(const string& data) const {
   uint128 correct_hash = QuicUtils::FNV1a_128_Hash(data.data(), data.length());
   uint128 mask(GG_UINT64_C(0x0), GG_UINT64_C(0xffffffff));
   mask <<= 96;
   correct_hash &= ~mask;
   return correct_hash;
 }
 
 }  // namespace net