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annotate pkcs_1_pss_encode.c @ 0:d7da3b1e1540 libtomcrypt

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put back the 0.95 makefile which was inadvertently merged over
author Matt Johnston <matt@ucc.asn.au>
date Mon, 31 May 2004 18:21:40 +0000
parents
children 6362d3854bb4
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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 #1 PSS Signature Padding -- Tom St Denis */
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14
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15 #ifdef PKCS_1
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16
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17 int pkcs_1_pss_encode(const unsigned char *msghash, unsigned long msghashlen,
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18 unsigned long saltlen, int hash_idx,
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19 int prng_idx, prng_state *prng,
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20 unsigned long modulus_bitlen,
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21 unsigned char *out, unsigned long *outlen)
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22 {
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23 unsigned char DB[1024], mask[sizeof(DB)], salt[sizeof(DB)], hash[sizeof(DB)];
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24 unsigned long x, y, hLen, modulus_len;
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25 int err;
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26 hash_state md;
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27
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28 _ARGCHK(msghash != NULL);
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29 _ARGCHK(out != NULL);
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30 _ARGCHK(outlen != NULL);
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31
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32 /* ensure hash and PRNG are valid */
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33 if ((err = hash_is_valid(hash_idx)) != CRYPT_OK) {
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34 return err;
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35 }
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36 if ((err = prng_is_valid(prng_idx)) != CRYPT_OK) {
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37 return err;
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38 }
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39
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40 hLen = hash_descriptor[hash_idx].hashsize;
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41 modulus_len = (modulus_bitlen>>3) + (modulus_bitlen & 7 ? 1 : 0);
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42
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43 /* check sizes */
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44 if ((saltlen > sizeof(salt)) || (modulus_len > sizeof(DB)) || (modulus_len < hLen + saltlen + 2)) {
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45 return CRYPT_INVALID_ARG;
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46 }
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47
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48 /* generate random salt */
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49 if (saltlen > 0) {
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50 if (prng_descriptor[prng_idx].read(salt, saltlen, prng) != saltlen) {
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51 return CRYPT_ERROR_READPRNG;
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52 }
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53 }
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54
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55 /* M = (eight) 0x00 || msghash || salt, hash = H(M) */
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56 hash_descriptor[hash_idx].init(&md);
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57 zeromem(DB, 8);
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58 if ((err = hash_descriptor[hash_idx].process(&md, DB, 8)) != CRYPT_OK) {
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59 return err;
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60 }
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61 if ((err = hash_descriptor[hash_idx].process(&md, msghash, msghashlen)) != CRYPT_OK) {
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62 return err;
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63 }
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64 if ((err = hash_descriptor[hash_idx].process(&md, salt, saltlen)) != CRYPT_OK) {
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65 return err;
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66 }
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67 if ((err = hash_descriptor[hash_idx].done(&md, hash)) != CRYPT_OK) {
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68 return err;
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69 }
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70
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71 /* generate DB = PS || 0x01 || salt, PS == modulus_len - saltlen - hLen - 2 zero bytes */
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72 for (x = 0; x < (modulus_len - saltlen - hLen - 2); x++) {
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73 DB[x] = 0x00;
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74 }
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75 DB[x++] = 0x01;
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76 for (y = 0; y < saltlen; y++) {
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77 DB[x++] = salt[y];
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78 }
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79
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80 /* generate mask of length modulus_len - hLen - 1 from hash */
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81 if ((err = pkcs_1_mgf1(hash, hLen, hash_idx, mask, modulus_len - hLen - 1)) != CRYPT_OK) {
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82 return err;
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83 }
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84
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85 /* xor against DB */
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86 for (y = 0; y < (modulus_len - hLen - 1); y++) {
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87 DB[y] ^= mask[y];
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88 }
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89
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90 /* output is DB || hash || 0xBC */
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91 if (*outlen < modulus_len) {
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92 return CRYPT_BUFFER_OVERFLOW;
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93 }
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94
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95 /* DB */
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96 for (y = x = 0; x < modulus_len - hLen - 1; x++) {
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97 out[y++] = DB[x];
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98 }
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99 /* hash */
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100 for (x = 0; x < hLen; x++) {
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101 out[y++] = hash[x];
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102 }
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103 /* 0xBC */
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104 out[y] = 0xBC;
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105
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106 /* now clear the 8*modulus_len - modulus_bitlen most significant bits */
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107 out[0] &= 0xFF >> ((modulus_len<<3) - modulus_bitlen);
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108
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109 /* store output size */
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110 *outlen = modulus_len;
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111
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112 #ifdef CLEAN_STACK
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113 zeromem(DB, sizeof(DB));
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114 zeromem(mask, sizeof(mask));
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115 zeromem(salt, sizeof(salt));
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116 zeromem(hash, sizeof(hash));
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117 #endif
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118
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119 return CRYPT_OK;
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120 }
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121
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122 #endif /* PKCS_1 */