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73 lines
2.2 KiB
C
73 lines
2.2 KiB
C
/* 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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