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| 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_encrypter.h" | |
| 6 | |
| 7 #include "net/quic/quic_data_writer.h" | |
| 8 #include "net/quic/quic_utils.h" | |
| 9 | |
| 10 using base::StringPiece; | |
| 11 using std::string; | |
| 12 | |
| 13 namespace net { | |
| 14 | |
| 15 const size_t kHashSizeShort = 12; // size of uint128 serialized short | |
| 16 | |
| 17 NullEncrypter::NullEncrypter() {} | |
| 18 | |
| 19 bool NullEncrypter::SetKey(StringPiece key) { | |
| 20 return key.empty(); | |
| 21 } | |
| 22 | |
| 23 bool NullEncrypter::SetNoncePrefix(StringPiece nonce_prefix) { | |
| 24 return nonce_prefix.empty(); | |
| 25 } | |
| 26 | |
| 27 bool NullEncrypter::EncryptPacket(QuicPathId /*path_id*/, | |
| 28 QuicPacketNumber /*packet_number*/, | |
| 29 StringPiece associated_data, | |
| 30 StringPiece plaintext, | |
| 31 char* output, | |
| 32 size_t* output_length, | |
| 33 size_t max_output_length) { | |
| 34 const size_t len = plaintext.size() + GetHashLength(); | |
| 35 if (max_output_length < len) { | |
| 36 return false; | |
| 37 } | |
| 38 uint128 hash = QuicUtils::FNV1a_128_Hash_Two( | |
| 39 associated_data.data(), associated_data.size(), plaintext.data(), | |
| 40 plaintext.size()); | |
| 41 // TODO(ianswett): memmove required for in place encryption. Placing the | |
| 42 // hash at the end would allow use of memcpy, doing nothing for in place. | |
| 43 memmove(output + GetHashLength(), plaintext.data(), plaintext.length()); | |
| 44 QuicUtils::SerializeUint128Short(hash, | |
| 45 reinterpret_cast<unsigned char*>(output)); | |
| 46 *output_length = len; | |
| 47 return true; | |
| 48 } | |
| 49 | |
| 50 size_t NullEncrypter::GetKeySize() const { | |
| 51 return 0; | |
| 52 } | |
| 53 | |
| 54 size_t NullEncrypter::GetNoncePrefixSize() const { | |
| 55 return 0; | |
| 56 } | |
| 57 | |
| 58 size_t NullEncrypter::GetMaxPlaintextSize(size_t ciphertext_size) const { | |
| 59 return ciphertext_size - GetHashLength(); | |
| 60 } | |
| 61 | |
| 62 size_t NullEncrypter::GetCiphertextSize(size_t plaintext_size) const { | |
| 63 return plaintext_size + GetHashLength(); | |
| 64 } | |
| 65 | |
| 66 StringPiece NullEncrypter::GetKey() const { | |
| 67 return StringPiece(); | |
| 68 } | |
| 69 | |
| 70 StringPiece NullEncrypter::GetNoncePrefix() const { | |
| 71 return StringPiece(); | |
| 72 } | |
| 73 | |
| 74 size_t NullEncrypter::GetHashLength() const { | |
| 75 return kHashSizeShort; | |
| 76 } | |
| 77 | |
| 78 } // namespace net | |
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