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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 |
