| // Copyright 2010-2015, Google Inc. |
| // All rights reserved. |
| // |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are |
| // met: |
| // |
| // * Redistributions of source code must retain the above copyright |
| // notice, this list of conditions and the following disclaimer. |
| // * Redistributions in binary form must reproduce the above |
| // copyright notice, this list of conditions and the following disclaimer |
| // in the documentation and/or other materials provided with the |
| // distribution. |
| // * Neither the name of Google Inc. nor the names of its |
| // contributors may be used to endorse or promote products derived from |
| // this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| #include "base/unverified_aes256.h" |
| |
| #include <algorithm> |
| #include <cstring> |
| |
| #include "base/logging.h" |
| |
| namespace mozc { |
| namespace internal { |
| namespace { |
| |
| const uint8_t kSBox[256] = { |
| 0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5, |
| 0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76, |
| 0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0, |
| 0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0, |
| 0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc, |
| 0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15, |
| 0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a, |
| 0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75, |
| 0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0, |
| 0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84, |
| 0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b, |
| 0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf, |
| 0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85, |
| 0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8, |
| 0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5, |
| 0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2, |
| 0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17, |
| 0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73, |
| 0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88, |
| 0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb, |
| 0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c, |
| 0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79, |
| 0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9, |
| 0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08, |
| 0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6, |
| 0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a, |
| 0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e, |
| 0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e, |
| 0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94, |
| 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf, |
| 0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68, |
| 0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16 |
| }; |
| |
| const uint8_t kInvSBox[256] = { |
| 0x52, 0x09, 0x6a, 0xd5, 0x30, 0x36, 0xa5, 0x38, |
| 0xbf, 0x40, 0xa3, 0x9e, 0x81, 0xf3, 0xd7, 0xfb, |
| 0x7c, 0xe3, 0x39, 0x82, 0x9b, 0x2f, 0xff, 0x87, |
| 0x34, 0x8e, 0x43, 0x44, 0xc4, 0xde, 0xe9, 0xcb, |
| 0x54, 0x7b, 0x94, 0x32, 0xa6, 0xc2, 0x23, 0x3d, |
| 0xee, 0x4c, 0x95, 0x0b, 0x42, 0xfa, 0xc3, 0x4e, |
| 0x08, 0x2e, 0xa1, 0x66, 0x28, 0xd9, 0x24, 0xb2, |
| 0x76, 0x5b, 0xa2, 0x49, 0x6d, 0x8b, 0xd1, 0x25, |
| 0x72, 0xf8, 0xf6, 0x64, 0x86, 0x68, 0x98, 0x16, |
| 0xd4, 0xa4, 0x5c, 0xcc, 0x5d, 0x65, 0xb6, 0x92, |
| 0x6c, 0x70, 0x48, 0x50, 0xfd, 0xed, 0xb9, 0xda, |
| 0x5e, 0x15, 0x46, 0x57, 0xa7, 0x8d, 0x9d, 0x84, |
| 0x90, 0xd8, 0xab, 0x00, 0x8c, 0xbc, 0xd3, 0x0a, |
| 0xf7, 0xe4, 0x58, 0x05, 0xb8, 0xb3, 0x45, 0x06, |
| 0xd0, 0x2c, 0x1e, 0x8f, 0xca, 0x3f, 0x0f, 0x02, |
| 0xc1, 0xaf, 0xbd, 0x03, 0x01, 0x13, 0x8a, 0x6b, |
| 0x3a, 0x91, 0x11, 0x41, 0x4f, 0x67, 0xdc, 0xea, |
| 0x97, 0xf2, 0xcf, 0xce, 0xf0, 0xb4, 0xe6, 0x73, |
| 0x96, 0xac, 0x74, 0x22, 0xe7, 0xad, 0x35, 0x85, |
| 0xe2, 0xf9, 0x37, 0xe8, 0x1c, 0x75, 0xdf, 0x6e, |
| 0x47, 0xf1, 0x1a, 0x71, 0x1d, 0x29, 0xc5, 0x89, |
| 0x6f, 0xb7, 0x62, 0x0e, 0xaa, 0x18, 0xbe, 0x1b, |
| 0xfc, 0x56, 0x3e, 0x4b, 0xc6, 0xd2, 0x79, 0x20, |
| 0x9a, 0xdb, 0xc0, 0xfe, 0x78, 0xcd, 0x5a, 0xf4, |
| 0x1f, 0xdd, 0xa8, 0x33, 0x88, 0x07, 0xc7, 0x31, |
| 0xb1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xec, 0x5f, |
| 0x60, 0x51, 0x7f, 0xa9, 0x19, 0xb5, 0x4a, 0x0d, |
| 0x2d, 0xe5, 0x7a, 0x9f, 0x93, 0xc9, 0x9c, 0xef, |
| 0xa0, 0xe0, 0x3b, 0x4d, 0xae, 0x2a, 0xf5, 0xb0, |
| 0xc8, 0xeb, 0xbb, 0x3c, 0x83, 0x53, 0x99, 0x61, |
| 0x17, 0x2b, 0x04, 0x7e, 0xba, 0x77, 0xd6, 0x26, |
| 0xe1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0c, 0x7d |
| }; |
| |
| const size_t kNr = 14; |
| |
| void AddRoundKey(uint8_t block[UnverifiedAES256::kBlockBytes], |
| const uint8 round_key[UnverifiedAES256::kBlockBytes]) { |
| for (size_t i = 0; i < UnverifiedAES256::kBlockBytes; ++i) { |
| block[i] ^= round_key[i]; |
| } |
| } |
| |
| uint8 GF_p8_mul3(uint8 val) { |
| const uint8 x = val * 2; |
| return (val >= 0x80) ? (x ^ 0x1b) : x; |
| } |
| |
| void MixColumnsImpl(uint8 column[4]) { |
| uint8 a1[4]; |
| uint8 a2[4]; |
| uint8 a3[4]; |
| for (size_t i = 0; i < 4; ++i) { |
| a1[i] = column[i]; |
| a2[i] = GF_p8_mul3(a1[i]); |
| a3[i] = a2[i] ^ a1[i]; |
| } |
| column[0] = a2[0] ^ a3[1] ^ a1[2] ^ a1[3]; |
| column[1] = a1[0] ^ a2[1] ^ a3[2] ^ a1[3]; |
| column[2] = a1[0] ^ a1[1] ^ a2[2] ^ a3[3]; |
| column[3] = a3[0] ^ a1[1] ^ a1[2] ^ a2[3]; |
| } |
| |
| void InvMixColumnsImpl(uint8 column[4]) { |
| uint8 a9[4]; |
| uint8 a11[4]; |
| uint8 a13[4]; |
| uint8 a14[4]; |
| for (size_t i = 0; i < 4; ++i) { |
| const uint8 a1 = column[i]; |
| const uint8 a2 = GF_p8_mul3(a1); |
| const uint8 a2_2 = GF_p8_mul3(a2); |
| a9[i] = GF_p8_mul3(a2_2) ^ a1; |
| a11[i] = GF_p8_mul3(a2_2 ^ a1) ^ a1; |
| const uint8 a2a1_2 = GF_p8_mul3(a2 ^ a1); |
| a13[i] = GF_p8_mul3(a2a1_2) ^ a1; |
| a14[i] = GF_p8_mul3(a2a1_2 ^ a1); |
| } |
| column[0] = a14[0] ^ a11[1] ^ a13[2] ^ a9[3]; |
| column[1] = a9[0] ^ a14[1] ^ a11[2] ^ a13[3]; |
| column[2] = a13[0] ^ a9[1] ^ a14[2] ^ a11[3]; |
| column[3] = a11[0] ^ a13[1] ^ a9[2] ^ a14[3]; |
| } |
| |
| } // namespace |
| |
| void UnverifiedAES256::TransformCBC(const uint8 (&key)[kKeyBytes], |
| const uint8 (&iv)[kBlockBytes], |
| uint8 *block, |
| size_t block_count) { |
| uint8 w[kKeyScheduleBytes]; |
| MakeKeySchedule(key, w); |
| |
| uint8 vec[kBlockBytes]; |
| memcpy(vec, iv, kBlockBytes); |
| for (size_t i = 0; i < block_count; ++i) { |
| uint8_t *src = block + (i * kBlockBytes); |
| for (size_t j = 0; j < kBlockBytes; ++j) { |
| src[j] ^= vec[j]; |
| } |
| TransformECB(w, src); |
| memcpy(vec, src, kBlockBytes); |
| } |
| } |
| |
| void UnverifiedAES256::InverseTransformCBC(const uint8 (&key)[kKeyBytes], |
| const uint8 (&iv)[kBlockBytes], |
| uint8 *block, |
| size_t block_count) { |
| uint8 w[kKeyScheduleBytes]; |
| MakeKeySchedule(key, w); |
| |
| uint8 prev_block[kBlockBytes]; |
| memcpy(prev_block, iv, kBlockBytes); |
| for (size_t i = 0; i < block_count; ++i) { |
| uint8 original_current_block[kBlockBytes]; |
| uint8_t *currnt_block = block + (i * kBlockBytes); |
| memcpy(original_current_block, currnt_block, kBlockBytes); |
| InverseTransformECB(w, currnt_block); |
| for (size_t j = 0; j < kBlockBytes; ++j) { |
| currnt_block[j] ^= prev_block[j]; |
| } |
| memcpy(prev_block, original_current_block, kBlockBytes); |
| } |
| } |
| |
| void UnverifiedAES256::MakeKeySchedule(const uint8 (&key)[kKeyBytes], |
| uint8 w[kKeyScheduleBytes]) { |
| memcpy(w, key, kKeyBytes); |
| for (size_t base = 1; ; ++base) { |
| uint8 *k = &w[base * kKeyBytes]; |
| uint8 *prev = k - kKeyBytes; |
| // Note: Although the following equation is not always satisfied, |
| // it is valid at least when 1 <= |base| <= 7. |
| DCHECK_LE(1, base); |
| DCHECK_GE(7, base); |
| const uint8 rcon = 1 << (base - 1); |
| k[0] = prev[0] ^ kSBox[prev[29]] ^ rcon; |
| k[1] = prev[1] ^ kSBox[prev[30]]; |
| k[2] = prev[2] ^ kSBox[prev[31]]; |
| k[3] = prev[3] ^ kSBox[prev[28]]; |
| for (size_t i = 4; i < 16; ++i) { |
| k[i] = prev[i] ^ k[i-4]; |
| } |
| if (base == 7) { |
| break; |
| } |
| for (size_t i = 16; i < 20; ++i) { |
| k[i] = prev[i] ^ kSBox[k[i-4]]; |
| } |
| for (size_t i = 20; i < 32; ++i) { |
| k[i] = prev[i] ^ k[i-4]; |
| } |
| } |
| } |
| |
| void UnverifiedAES256::SubBytes(uint8 block[kBlockBytes]) { |
| for (size_t i = 0; i < kBlockBytes; ++i) { |
| block[i] = kSBox[block[i]]; |
| } |
| } |
| |
| void UnverifiedAES256::InvSubBytes(uint8 block[kBlockBytes]) { |
| for (size_t i = 0; i < kBlockBytes; ++i) { |
| block[i] = kInvSBox[block[i]]; |
| } |
| } |
| |
| void UnverifiedAES256::MixColumns(uint8 block[kBlockBytes]) { |
| for (size_t i = 0; i < kBlockBytes; i+=4) { |
| MixColumnsImpl(block + i); |
| } |
| } |
| |
| void UnverifiedAES256::InvMixColumns(uint8 block[kBlockBytes]) { |
| for (size_t i = 0; i < kBlockBytes; i+=4) { |
| InvMixColumnsImpl(block + i); |
| } |
| } |
| |
| void UnverifiedAES256::ShiftRows(uint8 block[kBlockBytes]) { |
| // Row 0 does not change. |
| |
| // Row 1 |
| { |
| const uint8 x = block[1]; |
| block[1] = block[5]; |
| block[5] = block[9]; |
| block[9] = block[13]; |
| block[13] = x; |
| } |
| |
| // Row 2 |
| { |
| std::swap(block[2], block[10]); |
| std::swap(block[6], block[14]); |
| } |
| |
| // Row 3 |
| { |
| const uint8 x = block[3]; |
| block[3] = block[15]; |
| block[15] = block[11]; |
| block[11] = block[7]; |
| block[7] = x; |
| } |
| } |
| |
| void UnverifiedAES256::InvShiftRows(uint8 block[kBlockBytes]) { |
| // Row 0 does not change. |
| |
| // Row 1 |
| { |
| const uint8 x = block[1]; |
| block[1] = block[13]; |
| block[13] = block[9]; |
| block[9] = block[5]; |
| block[5] = x; |
| } |
| |
| // Row 2 |
| { |
| std::swap(block[2], block[10]); |
| std::swap(block[6], block[14]); |
| } |
| |
| // Row 3 |
| { |
| const uint8 x = block[3]; |
| block[3] = block[7]; |
| block[7] = block[11]; |
| block[11] = block[15]; |
| block[15] = x; |
| } |
| } |
| |
| void UnverifiedAES256::TransformECB(const uint8 (&w)[kKeyScheduleBytes], |
| uint8 block[kBlockBytes]) { |
| AddRoundKey(block, &w[0]); |
| for (size_t round = 1; round < kNr; ++round) { |
| SubBytes(block); |
| ShiftRows(block); |
| MixColumns(block); |
| AddRoundKey(block, &w[kBlockBytes * round]); |
| } |
| SubBytes(block); |
| ShiftRows(block); |
| AddRoundKey(block, &w[kBlockBytes * kNr]); |
| } |
| |
| void UnverifiedAES256::InverseTransformECB(const uint8 (&w)[kKeyScheduleBytes], |
| uint8 block[kBlockBytes]) { |
| AddRoundKey(block, &w[kBlockBytes * kNr]); |
| InvShiftRows(block); |
| InvSubBytes(block); |
| for (size_t round = (kNr - 1); round > 0; --round) { |
| AddRoundKey(block, &w[kBlockBytes * round]); |
| InvMixColumns(block); |
| InvShiftRows(block); |
| InvSubBytes(block); |
| } |
| AddRoundKey(block, &w[0]); |
| } |
| |
| } // namespace internal |
| } // namespace mozc |