annotate pkcs_5_2.c @ 144:7ed585a2c53b libtomcrypt

propagate of 3f8f752126017cbe7d93c4086c27a91550df745f and 747ebf284d40a15b338e5a5c7730ecec6eade3d7 from branch 'au.asn.ucc.matt.ltc-orig' to 'au.asn.ucc.matt.ltc-db'
author Matt Johnston <matt@ucc.asn.au>
date Sun, 19 Dec 2004 11:47:33 +0000
parents 5d99163f7e32
children
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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];
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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 buf[0] = XMALLOC(MAXBLOCKSIZE * 2);
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37 hmac = XMALLOC(sizeof(hmac_state));
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38 if (hmac == NULL || buf[0] == NULL) {
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39 if (hmac != NULL) {
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40 XFREE(hmac);
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41 }
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42 if (buf[0] != NULL) {
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43 XFREE(buf[0]);
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44 }
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45 return CRYPT_MEM;
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46 }
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47 /* buf[1] points to the second block of MAXBLOCKSIZE bytes */
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48 buf[1] = buf[0] + MAXBLOCKSIZE;
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49
3
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50 left = *outlen;
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51 blkno = 1;
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52 stored = 0;
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53 while (left != 0) {
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54 /* process block number blkno */
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55 zeromem(buf[0], MAXBLOCKSIZE*2);
3
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56
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57 /* store current block number and increment for next pass */
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58 STORE32H(blkno, buf[1]);
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59 ++blkno;
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60
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61 /* get PRF(P, S||int(blkno)) */
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62 if ((err = hmac_init(hmac, hash_idx, password, password_len)) != CRYPT_OK) {
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63 goto __ERR;
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64 }
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65 if ((err = hmac_process(hmac, salt, salt_len)) != CRYPT_OK) {
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66 goto __ERR;
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67 }
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68 if ((err = hmac_process(hmac, buf[1], 4)) != CRYPT_OK) {
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69 goto __ERR;
3
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70 }
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71 x = MAXBLOCKSIZE;
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72 if ((err = hmac_done(hmac, buf[0], &x)) != CRYPT_OK) {
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73 goto __ERR;
3
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74 }
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75
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76 /* now compute repeated and XOR it in buf[1] */
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77 XMEMCPY(buf[1], buf[0], x);
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78 for (itts = 1; itts < iteration_count; ++itts) {
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79 if ((err = hmac_memory(hash_idx, password, password_len, buf[0], x, buf[0], &x)) != CRYPT_OK) {
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80 goto __ERR;
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81 }
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82 for (y = 0; y < x; y++) {
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83 buf[1][y] ^= buf[0][y];
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84 }
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85 }
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86
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87 /* now emit upto x bytes of buf[1] to output */
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88 for (y = 0; y < x && left != 0; ++y) {
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89 out[stored++] = buf[1][y];
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90 --left;
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91 }
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92 }
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93 *outlen = stored;
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94
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95 err = CRYPT_OK;
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96 __ERR:
3
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97 #ifdef CLEAN_STACK
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98 zeromem(buf[0], MAXBLOCKSIZE*2);
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99 zeromem(hmac, sizeof(hmac_state));
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100 #endif
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101
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102 XFREE(hmac);
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103 XFREE(buf[0]);
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104
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105 return err;
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106 }
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107
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108 #endif
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109