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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 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 | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include "net/quic/crypto/null_decrypter.h" | 5 #include "net/quic/crypto/null_decrypter.h" |
6 #include "net/quic/quic_utils.h" | 6 #include "net/quic/quic_utils.h" |
7 #include "net/quic/quic_data_reader.h" | 7 #include "net/quic/quic_data_reader.h" |
8 | 8 |
9 using base::StringPiece; | 9 using base::StringPiece; |
10 using std::string; | 10 using std::string; |
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46 | 46 |
47 QuicData* NullDecrypter::DecryptPacket(QuicPacketSequenceNumber /*seq_number*/, | 47 QuicData* NullDecrypter::DecryptPacket(QuicPacketSequenceNumber /*seq_number*/, |
48 StringPiece associated_data, | 48 StringPiece associated_data, |
49 StringPiece ciphertext) { | 49 StringPiece ciphertext) { |
50 // It's worth duplicating |Decrypt|, above, in order to save a copy by using | 50 // It's worth duplicating |Decrypt|, above, in order to save a copy by using |
51 // the shared-data QuicData constructor directly. | 51 // the shared-data QuicData constructor directly. |
52 QuicDataReader reader(ciphertext.data(), ciphertext.length()); | 52 QuicDataReader reader(ciphertext.data(), ciphertext.length()); |
53 | 53 |
54 uint128 hash; | 54 uint128 hash; |
55 if (!ReadHash(&reader, &hash)) { | 55 if (!ReadHash(&reader, &hash)) { |
56 return NULL; | 56 return nullptr; |
57 } | 57 } |
58 | 58 |
59 StringPiece plaintext = reader.ReadRemainingPayload(); | 59 StringPiece plaintext = reader.ReadRemainingPayload(); |
60 | 60 |
61 // TODO(rch): avoid buffer copy here | 61 // TODO(rch): avoid buffer copy here |
62 string buffer = associated_data.as_string(); | 62 string buffer = associated_data.as_string(); |
63 plaintext.AppendToString(&buffer); | 63 plaintext.AppendToString(&buffer); |
64 | 64 |
65 if (hash != ComputeHash(buffer)) { | 65 if (hash != ComputeHash(buffer)) { |
66 return NULL; | 66 return nullptr; |
67 } | 67 } |
68 return new QuicData(plaintext.data(), plaintext.length()); | 68 return new QuicData(plaintext.data(), plaintext.length()); |
69 } | 69 } |
70 | 70 |
71 StringPiece NullDecrypter::GetKey() const { return StringPiece(); } | 71 StringPiece NullDecrypter::GetKey() const { return StringPiece(); } |
72 | 72 |
73 StringPiece NullDecrypter::GetNoncePrefix() const { return StringPiece(); } | 73 StringPiece NullDecrypter::GetNoncePrefix() const { return StringPiece(); } |
74 | 74 |
75 bool NullDecrypter::ReadHash(QuicDataReader* reader, uint128* hash) { | 75 bool NullDecrypter::ReadHash(QuicDataReader* reader, uint128* hash) { |
76 uint64 lo; | 76 uint64 lo; |
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87 | 87 |
88 uint128 NullDecrypter::ComputeHash(const string& data) const { | 88 uint128 NullDecrypter::ComputeHash(const string& data) const { |
89 uint128 correct_hash = QuicUtils::FNV1a_128_Hash(data.data(), data.length()); | 89 uint128 correct_hash = QuicUtils::FNV1a_128_Hash(data.data(), data.length()); |
90 uint128 mask(GG_UINT64_C(0x0), GG_UINT64_C(0xffffffff)); | 90 uint128 mask(GG_UINT64_C(0x0), GG_UINT64_C(0xffffffff)); |
91 mask <<= 96; | 91 mask <<= 96; |
92 correct_hash &= ~mask; | 92 correct_hash &= ~mask; |
93 return correct_hash; | 93 return correct_hash; |
94 } | 94 } |
95 | 95 |
96 } // namespace net | 96 } // namespace net |
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