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1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2011 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 "crypto/encryptor.h" | 5 #include "crypto/encryptor.h" |
6 | 6 |
7 #include "base/logging.h" | 7 #include "base/logging.h" |
8 #include "build/build_config.h" | 8 #include "base/sys_byteorder.h" |
9 | |
10 // Include headers to provide bswap for all platforms. | |
11 #if defined(COMPILER_MSVC) | |
12 #include <stdlib.h> | |
13 #define bswap_16(x) _byteswap_ushort(x) | |
14 #define bswap_32(x) _byteswap_ulong(x) | |
15 #define bswap_64(x) _byteswap_uint64(x) | |
16 #elif defined(OS_MACOSX) | |
17 #include <libkern/OSByteOrder.h> | |
18 #define bswap_16(x) OSSwapInt16(x) | |
19 #define bswap_32(x) OSSwapInt32(x) | |
20 #define bswap_64(x) OSSwapInt64(x) | |
21 #elif defined(OS_OPENBSD) | |
22 #include <sys/endian.h> | |
23 #define bswap_16(x) swap16(x) | |
24 #define bswap_32(x) swap32(x) | |
25 #define bswap_64(x) swap64(x) | |
26 #else | |
27 #include <byteswap.h> | |
28 #endif | |
29 | |
30 #if defined(ARCH_CPU_LITTLE_ENDIAN) | |
31 #define ntoh_64(x) bswap_64(x) | |
32 #define hton_64(x) bswap_64(x) | |
33 #else | |
34 #define ntoh_64(x) (x) | |
35 #define hton_64(x) (x) | |
36 #endif | |
37 | 9 |
38 namespace crypto { | 10 namespace crypto { |
39 | 11 |
40 ///////////////////////////////////////////////////////////////////////////// | 12 ///////////////////////////////////////////////////////////////////////////// |
41 // Encyptor::Counter Implementation. | 13 // Encyptor::Counter Implementation. |
42 Encryptor::Counter::Counter(const base::StringPiece& counter) { | 14 Encryptor::Counter::Counter(const base::StringPiece& counter) { |
43 CHECK(sizeof(counter_) == counter.length()); | 15 CHECK(sizeof(counter_) == counter.length()); |
44 | 16 |
45 memcpy(&counter_, counter.data(), sizeof(counter_)); | 17 memcpy(&counter_, counter.data(), sizeof(counter_)); |
46 } | 18 } |
47 | 19 |
48 Encryptor::Counter::~Counter() { | 20 Encryptor::Counter::~Counter() { |
49 } | 21 } |
50 | 22 |
51 bool Encryptor::Counter::Increment() { | 23 bool Encryptor::Counter::Increment() { |
52 uint64 low_num = ntoh_64(counter_.components64[1]); | 24 uint64 low_num = base::ntohll(counter_.components64[1]); |
53 uint64 new_low_num = low_num + 1; | 25 uint64 new_low_num = low_num + 1; |
54 counter_.components64[1] = hton_64(new_low_num); | 26 counter_.components64[1] = base::htonll(new_low_num); |
55 | 27 |
56 // If overflow occured then increment the most significant component. | 28 // If overflow occured then increment the most significant component. |
57 if (new_low_num < low_num) { | 29 if (new_low_num < low_num) { |
58 counter_.components64[0] = | 30 counter_.components64[0] = |
59 hton_64(ntoh_64(counter_.components64[0]) + 1); | 31 base::htonll(base::ntohll(counter_.components64[0]) + 1); |
60 } | 32 } |
61 | 33 |
62 // TODO(hclam): Return false if counter value overflows. | 34 // TODO(hclam): Return false if counter value overflows. |
63 return true; | 35 return true; |
64 } | 36 } |
65 | 37 |
66 void Encryptor::Counter::Write(void* buf) { | 38 void Encryptor::Counter::Write(void* buf) { |
67 uint8* buf_ptr = reinterpret_cast<uint8*>(buf); | 39 uint8* buf_ptr = reinterpret_cast<uint8*>(buf); |
68 memcpy(buf_ptr, &counter_, sizeof(counter_)); | 40 memcpy(buf_ptr, &counter_, sizeof(counter_)); |
69 } | 41 } |
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116 DCHECK_EQ(CTR, mode_); | 88 DCHECK_EQ(CTR, mode_); |
117 const uint8* plaintext_ptr = reinterpret_cast<const uint8*>(plaintext); | 89 const uint8* plaintext_ptr = reinterpret_cast<const uint8*>(plaintext); |
118 const uint8* mask_ptr = reinterpret_cast<const uint8*>(mask); | 90 const uint8* mask_ptr = reinterpret_cast<const uint8*>(mask); |
119 uint8* ciphertext_ptr = reinterpret_cast<uint8*>(ciphertext); | 91 uint8* ciphertext_ptr = reinterpret_cast<uint8*>(ciphertext); |
120 | 92 |
121 for (size_t i = 0; i < plaintext_len; ++i) | 93 for (size_t i = 0; i < plaintext_len; ++i) |
122 ciphertext_ptr[i] = plaintext_ptr[i] ^ mask_ptr[i]; | 94 ciphertext_ptr[i] = plaintext_ptr[i] ^ mask_ptr[i]; |
123 } | 95 } |
124 | 96 |
125 } // namespace crypto | 97 } // namespace crypto |
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