| OLD | NEW |
| (Empty) |
| 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #include "net/quic/crypto/null_decrypter.h" | |
| 6 #include "net/quic/quic_utils.h" | |
| 7 #include "net/quic/quic_data_reader.h" | |
| 8 | |
| 9 using base::StringPiece; | |
| 10 using std::string; | |
| 11 | |
| 12 namespace net { | |
| 13 | |
| 14 NullDecrypter::NullDecrypter() {} | |
| 15 | |
| 16 bool NullDecrypter::SetKey(StringPiece key) { return key.empty(); } | |
| 17 | |
| 18 bool NullDecrypter::SetNoncePrefix(StringPiece nonce_prefix) { | |
| 19 return nonce_prefix.empty(); | |
| 20 } | |
| 21 | |
| 22 bool NullDecrypter::DecryptPacket(QuicPacketSequenceNumber /*seq_number*/, | |
| 23 const StringPiece& associated_data, | |
| 24 const StringPiece& ciphertext, | |
| 25 char* output, | |
| 26 size_t* output_length, | |
| 27 size_t max_output_length) { | |
| 28 QuicDataReader reader(ciphertext.data(), ciphertext.length()); | |
| 29 uint128 hash; | |
| 30 | |
| 31 if (!ReadHash(&reader, &hash)) { | |
| 32 return false; | |
| 33 } | |
| 34 | |
| 35 StringPiece plaintext = reader.ReadRemainingPayload(); | |
| 36 if (plaintext.length() > max_output_length) { | |
| 37 LOG(DFATAL) << "Output buffer must be larger than the plaintext."; | |
| 38 return false; | |
| 39 } | |
| 40 if (hash != ComputeHash(associated_data, plaintext)) { | |
| 41 return false; | |
| 42 } | |
| 43 // Copy the plaintext to output. | |
| 44 memcpy(output, plaintext.data(), plaintext.length()); | |
| 45 *output_length = plaintext.length(); | |
| 46 return true; | |
| 47 } | |
| 48 | |
| 49 StringPiece NullDecrypter::GetKey() const { return StringPiece(); } | |
| 50 | |
| 51 StringPiece NullDecrypter::GetNoncePrefix() const { return StringPiece(); } | |
| 52 | |
| 53 bool NullDecrypter::ReadHash(QuicDataReader* reader, uint128* hash) { | |
| 54 uint64 lo; | |
| 55 uint32 hi; | |
| 56 if (!reader->ReadUInt64(&lo) || | |
| 57 !reader->ReadUInt32(&hi)) { | |
| 58 return false; | |
| 59 } | |
| 60 *hash = hi; | |
| 61 *hash <<= 64; | |
| 62 *hash += lo; | |
| 63 return true; | |
| 64 } | |
| 65 | |
| 66 uint128 NullDecrypter::ComputeHash(const StringPiece& data1, | |
| 67 const StringPiece& data2) const { | |
| 68 uint128 correct_hash = QuicUtils::FNV1a_128_Hash_Two( | |
| 69 data1.data(), data1.length(), data2.data(), data2.length()); | |
| 70 uint128 mask(GG_UINT64_C(0x0), GG_UINT64_C(0xffffffff)); | |
| 71 mask <<= 96; | |
| 72 correct_hash &= ~mask; | |
| 73 return correct_hash; | |
| 74 } | |
| 75 | |
| 76 } // namespace net | |
| OLD | NEW |