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annotate pkcs_5_1.c @ 211:f01f0400314d libtomcrypt

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disapproval of revision 6a39eb8b36778460fca83b8149df2a8b6d3327fd
author Matt Johnston <matt@ucc.asn.au>
date Wed, 06 Jul 2005 13:23:45 +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 #include <mycrypt.h>
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12
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13 /* PKCS #5, Algorithm #1 */
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14 #ifdef PKCS_5
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15
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16 int pkcs_5_alg1(const unsigned char *password, unsigned long password_len,
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17 const unsigned char *salt,
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18 int iteration_count, int hash_idx,
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19 unsigned char *out, unsigned long *outlen)
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20 {
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21 int err;
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22 unsigned long x;
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23 hash_state md;
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24 unsigned char buf[MAXBLOCKSIZE];
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25
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26 _ARGCHK(password != NULL);
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27 _ARGCHK(salt != NULL);
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28 _ARGCHK(out != NULL);
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29 _ARGCHK(outlen != NULL);
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30
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31 /* test hash IDX */
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32 if ((err = hash_is_valid(hash_idx)) != CRYPT_OK) {
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33 return err;
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34 }
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35
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36 /* hash initial password + salt */
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37 hash_descriptor[hash_idx].init(&md);
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38 hash_descriptor[hash_idx].process(&md, password, password_len);
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39 hash_descriptor[hash_idx].process(&md, salt, 8);
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40 hash_descriptor[hash_idx].done(&md, buf);
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41
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42 while (--iteration_count) {
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43 // code goes here.
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44 x = sizeof(buf);
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45 if ((err = hash_memory(hash_idx, buf, hash_descriptor[hash_idx].hashsize, buf, &x)) != CRYPT_OK) {
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46 return err;
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47 }
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48 }
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49
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50 /* copy upto outlen bytes */
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51 for (x = 0; x < hash_descriptor[hash_idx].hashsize && x < *outlen; x++) {
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52 out[x] = buf[x];
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53 }
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54 *outlen = x;
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55
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56 #ifdef CLEAN_STACK
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57 zeromem(buf, sizeof(buf));
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58 #endif
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59
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60 return CRYPT_OK;
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61 }
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62
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63 #endif