Mercurial > dropbear

annotate src/misc/pkcs5/pkcs_5_2.c @ 191:1c15b283127b libtomcrypt-orig

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Import of libtomcrypt 1.02 with manual path rename rearrangement etc
author Matt Johnston <matt@ucc.asn.au>
date Fri, 06 May 2005 13:23:02 +0000
parents
children 39d5d58461d6
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191
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
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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 *
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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6 * The library is free for all purposes without any express
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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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
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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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 pkcs_5_2.c
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15 PKCS #5, Algorithm #2, Tom St Denis
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16 */
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17 #ifdef PKCS_5
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18
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19 /**
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20 Execute PKCS #5 v2
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21 @param password The input password (or key)
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22 @param password_len The length of the password (octets)
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23 @param salt The salt (or nonce)
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24 @param salt_len The length of the salt (octets)
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25 @param iteration_count # of iterations desired for PKCS #5 v2 [read specs for more]
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26 @param hash_idx The index of the hash desired
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27 @param out [out] The destination for this algorithm
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28 @param outlen [in/out] The max size and resulting size of the algorithm output
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29 @return CRYPT_OK if successful
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30 */
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31 int pkcs_5_alg2(const unsigned char *password, unsigned long password_len,
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32 const unsigned char *salt, unsigned long salt_len,
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33 int iteration_count, int hash_idx,
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34 unsigned char *out, unsigned long *outlen)
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35 {
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36 int err, itts;
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37 ulong32 blkno;
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38 unsigned long stored, left, x, y;
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39 unsigned char *buf[2];
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40 hmac_state *hmac;
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41
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42 LTC_ARGCHK(password != NULL);
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43 LTC_ARGCHK(salt != NULL);
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44 LTC_ARGCHK(out != NULL);
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45 LTC_ARGCHK(outlen != NULL);
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46
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47 /* test hash IDX */
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48 if ((err = hash_is_valid(hash_idx)) != CRYPT_OK) {
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49 return err;
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50 }
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51
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52 buf[0] = XMALLOC(MAXBLOCKSIZE * 2);
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53 hmac = XMALLOC(sizeof(hmac_state));
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54 if (hmac == NULL || buf[0] == NULL) {
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55 if (hmac != NULL) {
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56 XFREE(hmac);
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57 }
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58 if (buf[0] != NULL) {
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59 XFREE(buf[0]);
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60 }
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61 return CRYPT_MEM;
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62 }
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63 /* buf[1] points to the second block of MAXBLOCKSIZE bytes */
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64 buf[1] = buf[0] + MAXBLOCKSIZE;
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65
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66 left = *outlen;
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67 blkno = 1;
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68 stored = 0;
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69 while (left != 0) {
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70 /* process block number blkno */
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71 zeromem(buf[0], MAXBLOCKSIZE*2);
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72
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73 /* store current block number and increment for next pass */
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74 STORE32H(blkno, buf[1]);
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75 ++blkno;
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76
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77 /* get PRF(P, S||int(blkno)) */
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78 if ((err = hmac_init(hmac, hash_idx, password, password_len)) != CRYPT_OK) {
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79 goto LBL_ERR;
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80 }
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81 if ((err = hmac_process(hmac, salt, salt_len)) != CRYPT_OK) {
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82 goto LBL_ERR;
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83 }
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84 if ((err = hmac_process(hmac, buf[1], 4)) != CRYPT_OK) {
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85 goto LBL_ERR;
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86 }
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87 x = MAXBLOCKSIZE;
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88 if ((err = hmac_done(hmac, buf[0], &x)) != CRYPT_OK) {
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89 goto LBL_ERR;
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90 }
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91
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92 /* now compute repeated and XOR it in buf[1] */
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93 XMEMCPY(buf[1], buf[0], x);
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94 for (itts = 1; itts < iteration_count; ++itts) {
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95 if ((err = hmac_memory(hash_idx, password, password_len, buf[0], x, buf[0], &x)) != CRYPT_OK) {
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96 goto LBL_ERR;
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97 }
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98 for (y = 0; y < x; y++) {
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99 buf[1][y] ^= buf[0][y];
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100 }
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101 }
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102
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103 /* now emit upto x bytes of buf[1] to output */
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104 for (y = 0; y < x && left != 0; ++y) {
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105 out[stored++] = buf[1][y];
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106 --left;
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107 }
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108 }
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109 *outlen = stored;
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110
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111 err = CRYPT_OK;
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112 LBL_ERR:
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113 #ifdef LTC_CLEAN_STACK
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114 zeromem(buf[0], MAXBLOCKSIZE*2);
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115 zeromem(hmac, sizeof(hmac_state));
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116 #endif
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117
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118 XFREE(hmac);
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119 XFREE(buf[0]);
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120
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121 return err;
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122 }
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123
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124 #endif
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125