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annotate pmac_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
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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
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12 /* PMAC implementation by Tom St Denis */
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13 #include "mycrypt.h"
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14
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15 #ifdef PMAC
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16
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17 int pmac_done(pmac_state *state, unsigned char *out, unsigned long *outlen)
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18 {
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19 int err, x;
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20
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21 _ARGCHK(state != NULL);
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22 _ARGCHK(out != NULL);
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23 if ((err = cipher_is_valid(state->cipher_idx)) != CRYPT_OK) {
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24 return err;
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25 }
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26
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27 if ((state->buflen > (int)sizeof(state->block)) || (state->buflen < 0) ||
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28 (state->block_len > (int)sizeof(state->block)) || (state->buflen > state->block_len)) {
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29 return CRYPT_INVALID_ARG;
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30 }
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31
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32
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33 /* handle padding. If multiple xor in L/x */
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34
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35 if (state->buflen == state->block_len) {
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36 /* xor Lr against the checksum */
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37 for (x = 0; x < state->block_len; x++) {
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38 state->checksum[x] ^= state->block[x] ^ state->Lr[x];
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39 }
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40 } else {
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41 /* otherwise xor message bytes then the 0x80 byte */
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42 for (x = 0; x < state->buflen; x++) {
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43 state->checksum[x] ^= state->block[x];
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44 }
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45 state->checksum[x] ^= 0x80;
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46 }
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47
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48 /* encrypt it */
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49 cipher_descriptor[state->cipher_idx].ecb_encrypt(state->checksum, state->checksum, &state->key);
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50
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51 /* store it */
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52 for (x = 0; x < state->block_len && x <= (int)*outlen; x++) {
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53 out[x] = state->checksum[x];
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54 }
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55 *outlen = x;
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56
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57 #ifdef CLEAN_STACK
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58 zeromem(state, sizeof(*state));
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59 #endif
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60 return CRYPT_OK;
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61 }
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62
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63 #endif
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