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annotate pkcs_5_2.c @ 17:1a066933c5e1 libtomcrypt

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Removed PDFs, if people want them there's the .tex
author Matt Johnston <matt@ucc.asn.au>
date Tue, 15 Jun 2004 14:32:29 +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 #2 */
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14 #ifdef PKCS_5
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15
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16 int pkcs_5_alg2(const unsigned char *password, unsigned long password_len,
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17 const unsigned char *salt, unsigned long salt_len,
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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, itts;
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22 unsigned long stored, left, x, y, blkno;
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23 unsigned char buf[2][MAXBLOCKSIZE];
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24 hmac_state hmac;
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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 left = *outlen;
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37 blkno = 1;
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38 stored = 0;
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39 while (left != 0) {
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40 /* process block number blkno */
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41 zeromem(buf, sizeof(buf));
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42
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43 /* store current block number and increment for next pass */
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44 STORE32H(blkno, buf[1]);
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45 ++blkno;
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46
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47 /* get PRF(P, S||int(blkno)) */
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48 if ((err = hmac_init(&hmac, hash_idx, password, password_len)) != CRYPT_OK) {
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49 return err;
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50 }
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51 if ((err = hmac_process(&hmac, salt, salt_len)) != CRYPT_OK) {
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52 return err;
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53 }
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54 if ((err = hmac_process(&hmac, buf[1], 4)) != CRYPT_OK) {
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55 return err;
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56 }
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57 x = sizeof(buf[0]);
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58 if ((err = hmac_done(&hmac, buf[0], &x)) != CRYPT_OK) {
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59 return err;
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60 }
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61
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62 /* now compute repeated and XOR it in buf[1] */
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63 memcpy(buf[1], buf[0], x);
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64 for (itts = 2; itts < iteration_count; ++itts) {
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65 if ((err = hmac_memory(hash_idx, password, password_len, buf[0], x, buf[0], &x)) != CRYPT_OK) {
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66 return err;
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67 }
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68 for (y = 0; y < x; y++) {
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69 buf[1][y] ^= buf[0][y];
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70 }
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71 }
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72
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73 /* now emit upto x bytes of buf[1] to output */
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74 for (y = 0; y < x && left != 0; ++y) {
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75 out[stored++] = buf[1][y];
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76 --left;
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77 }
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78 }
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79 *outlen = stored;
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80
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81 #ifdef CLEAN_STACK
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82 zeromem(buf, sizeof(buf));
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83 #endif
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84 return CRYPT_OK;
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85 }
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86
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87 #endif
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88