Mercurial > dropbear
annotate libtomcrypt/src/mac/pmac/pmac_done.c @ 372:fbcc3b5b34f3
comment about putenv() leaking malloced variables
author | Matt Johnston <matt@ucc.asn.au> |
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date | Thu, 02 Nov 2006 16:52:59 +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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34 |
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35 |
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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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66 |
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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 $ */ |