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Side by Side Diff: net/quic/crypto/null_encrypter.cc

Issue 2193073003: Move shared files in net/quic/ into net/quic/core/ (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: io_thread_unittest.cc Created 4 years, 4 months ago
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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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