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annotate omac_done.c @ 18:712dd6dfb0eb libtomcrypt

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makefile
author Matt Johnston <matt@ucc.asn.au>
date Tue, 15 Jun 2004 14:34:07 +0000
parents d7da3b1e1540
children 5d99163f7e32
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1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
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2 *
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3 * LibTomCrypt is a library that provides various cryptographic
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4 * algorithms in a highly modular and flexible manner.
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5 *
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6 * The library is free for all purposes without any express
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7 * guarantee it works.
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8 *
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9 * Tom St Denis, [email protected], http://libtomcrypt.org
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10 */
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11 /* OMAC1 Support by Tom St Denis (for 64 and 128 bit block ciphers only) */
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12 #include "mycrypt.h"
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13
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14 #ifdef OMAC
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15
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16 int omac_done(omac_state *state, unsigned char *out, unsigned long *outlen)
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17 {
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18 int err, mode, x;
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19
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20 _ARGCHK(state != NULL);
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21 _ARGCHK(out != NULL);
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22 if ((err = cipher_is_valid(state->cipher_idx)) != CRYPT_OK) {
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23 return err;
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24 }
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25
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26 if ((state->buflen > (int)sizeof(state->block)) || (state->buflen < 0) ||
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27 (state->blklen > (int)sizeof(state->block)) || (state->buflen > state->blklen)) {
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28 return CRYPT_INVALID_ARG;
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29 }
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30
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31 /* figure out mode */
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32 if (state->buflen != state->blklen) {
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33 /* add the 0x80 byte */
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34 state->block[state->buflen++] = 0x80;
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35
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36 /* pad with 0x00 */
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37 while (state->buflen < state->blklen) {
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38 state->block[state->buflen++] = 0x00;
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39 }
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40 mode = 1;
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41 } else {
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42 mode = 0;
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43 }
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44
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45 /* now xor prev + Lu[mode] */
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46 for (x = 0; x < state->blklen; x++) {
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47 state->block[x] ^= state->prev[x] ^ state->Lu[mode][x];
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48 }
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49
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50 /* encrypt it */
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51 cipher_descriptor[state->cipher_idx].ecb_encrypt(state->block, state->block, &state->key);
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52
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53 /* output it */
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54 for (x = 0; x < state->blklen && (unsigned long)x < *outlen; x++) {
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55 out[x] = state->block[x];
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56 }
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57 *outlen = x;
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58
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59 #ifdef CLEAN_STACK
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60 zeromem(state, sizeof(*state));
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61 #endif
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62 return CRYPT_OK;
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63 }
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64
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65 #endif
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66