Mercurial > dropbear

annotate libtomcrypt/src/mac/pmac/pmac_done.c @ 409:0e69e948caba

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Add comments about requiring keysize <= 2*SHA1_HASH_SIZE
author Matt Johnston <matt@ucc.asn.au>
date Sun, 04 Feb 2007 10:31:48 +0000
parents 1b9e69c058d2
children 0cbe8f6dbf9e
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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 #include "tomcrypt.h"
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12
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13 /**
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14 @file pmac_done.c
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15 PMAC implementation, terminate a session, by Tom St Denis
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16 */
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17
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18 #ifdef PMAC
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19
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20 int pmac_done(pmac_state *state, unsigned char *out, unsigned long *outlen)
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21 {
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22 int err, x;
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23
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24 LTC_ARGCHK(state != NULL);
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25 LTC_ARGCHK(out != NULL);
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26 if ((err = cipher_is_valid(state->cipher_idx)) != CRYPT_OK) {
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27 return err;
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28 }
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29
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30 if ((state->buflen > (int)sizeof(state->block)) || (state->buflen < 0) ||
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31 (state->block_len > (int)sizeof(state->block)) || (state->buflen > state->block_len)) {
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32 return CRYPT_INVALID_ARG;
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33 }
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36 /* handle padding. If multiple xor in L/x */
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37
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38 if (state->buflen == state->block_len) {
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39 /* xor Lr against the checksum */
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40 for (x = 0; x < state->block_len; x++) {
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41 state->checksum[x] ^= state->block[x] ^ state->Lr[x];
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42 }
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43 } else {
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44 /* otherwise xor message bytes then the 0x80 byte */
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45 for (x = 0; x < state->buflen; x++) {
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46 state->checksum[x] ^= state->block[x];
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47 }
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48 state->checksum[x] ^= 0x80;
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49 }
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50
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51 /* encrypt it */
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52 cipher_descriptor[state->cipher_idx].ecb_encrypt(state->checksum, state->checksum, &state->key);
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53 cipher_descriptor[state->cipher_idx].done(&state->key);
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54
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55 /* store it */
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56 for (x = 0; x < state->block_len && x <= (int)*outlen; x++) {
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57 out[x] = state->checksum[x];
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58 }
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59 *outlen = x;
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60
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61 #ifdef LTC_CLEAN_STACK
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62 zeromem(state, sizeof(*state));
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63 #endif
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64 return CRYPT_OK;
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65 }
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67 #endif
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68
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69
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70 /* $Source: /cvs/libtom/libtomcrypt/src/mac/pmac/pmac_done.c,v $ */
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71 /* $Revision: 1.4 $ */
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72 /* $Date: 2005/05/05 14:35:59 $ */