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72 lines
2.2 KiB
72 lines
2.2 KiB
/* libanode: the Anode C reference implementation |
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* Copyright (C) 2009-2010 Adam Ierymenko <adam.ierymenko@gmail.com> |
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* |
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* This program is free software: you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation, either version 3 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
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#include "aes.h" |
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void Anode_cmac_aes256( |
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const AnodeAesExpandedKey *expkey, |
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const unsigned char *restrict data, |
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unsigned long data_len, |
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unsigned char *restrict mac) |
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{ |
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unsigned char cbc[16]; |
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unsigned char pad[16]; |
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const unsigned char *restrict pos = data; |
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unsigned long i; |
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unsigned long remaining = data_len; |
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unsigned char c; |
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((uint64_t *)((void *)cbc))[0] = 0ULL; |
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((uint64_t *)((void *)cbc))[1] = 0ULL; |
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while (remaining >= 16) { |
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((uint64_t *)((void *)cbc))[0] ^= ((uint64_t *)((void *)pos))[0]; |
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((uint64_t *)((void *)cbc))[1] ^= ((uint64_t *)((void *)pos))[1]; |
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pos += 16; |
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if (remaining > 16) |
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Anode_aes256_encrypt(expkey,cbc,cbc); |
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remaining -= 16; |
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} |
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((uint64_t *)((void *)pad))[0] = 0ULL; |
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((uint64_t *)((void *)pad))[1] = 0ULL; |
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Anode_aes256_encrypt(expkey,pad,pad); |
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c = pad[0] & 0x80; |
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for(i=0;i<15;++i) |
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pad[i] = (pad[i] << 1) | (pad[i + 1] >> 7); |
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pad[15] <<= 1; |
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if (c) |
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pad[15] ^= 0x87; |
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if (remaining||(!data_len)) { |
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for(i=0;i<remaining;++i) |
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cbc[i] ^= *(pos++); |
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cbc[remaining] ^= 0x80; |
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c = pad[0] & 0x80; |
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for(i=0;i<15;++i) |
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pad[i] = (pad[i] << 1) | (pad[i + 1] >> 7); |
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pad[15] <<= 1; |
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if (c) |
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pad[15] ^= 0x87; |
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} |
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((uint64_t *)((void *)mac))[0] = ((uint64_t *)((void *)pad))[0] ^ ((uint64_t *)((void *)cbc))[0]; |
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((uint64_t *)((void *)mac))[1] = ((uint64_t *)((void *)pad))[1] ^ ((uint64_t *)((void *)cbc))[1]; |
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Anode_aes256_encrypt(expkey,mac,mac); |
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}
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