Mercurial > dropbear

annotate src/pk/pkcs1/pkcs_1_pss_encode.c @ 222:36160290a1b2 libtomcrypt LTC_DB_0.46

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* change include path of options.h * don't use the constant ROL/ROR operations, since compilers seem to have problems
author Matt Johnston <matt@ucc.asn.au>
date Fri, 08 Jul 2005 19:13:24 +0000
parents 39d5d58461d6
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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2 *
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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3 * LibTomCrypt is a library that provides various cryptographic
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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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
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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_1_pss_encode.c
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15 PKCS #1 PSS Signature Padding, Tom St Denis
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16 */
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17
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18 #ifdef PKCS_1
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19
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20 /**
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21 PKCS #1 v2.00 Signature Encoding
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22 @param msghash The hash to encode
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23 @param msghashlen The length of the hash (octets)
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24 @param saltlen The length of the salt desired (octets)
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25 @param prng An active PRNG context
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26 @param prng_idx The index of the PRNG desired
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27 @param hash_idx The index of the hash desired
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28 @param modulus_bitlen The bit length of the RSA modulus
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29 @param out [out] The destination of the encoding
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30 @param outlen [in/out] The max size and resulting size of the encoded data
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31 @return CRYPT_OK if successful
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32 */
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33 int pkcs_1_pss_encode(const unsigned char *msghash, unsigned long msghashlen,
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34 unsigned long saltlen, prng_state *prng,
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35 int prng_idx, int hash_idx,
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36 unsigned long modulus_bitlen,
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37 unsigned char *out, unsigned long *outlen)
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38 {
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39 unsigned char *DB, *mask, *salt, *hash;
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40 unsigned long x, y, hLen, modulus_len;
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41 int err;
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42 hash_state md;
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43
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44 LTC_ARGCHK(msghash != NULL);
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45 LTC_ARGCHK(out != NULL);
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46 LTC_ARGCHK(outlen != NULL);
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47
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48 /* ensure hash and PRNG are valid */
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49 if ((err = hash_is_valid(hash_idx)) != CRYPT_OK) {
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50 return err;
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51 }
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52 if ((err = prng_is_valid(prng_idx)) != CRYPT_OK) {
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53 return err;
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54 }
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55
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56 hLen = hash_descriptor[hash_idx].hashsize;
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57 modulus_len = (modulus_bitlen>>3) + (modulus_bitlen & 7 ? 1 : 0);
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58
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59 /* check sizes */
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60 if ((saltlen > modulus_len) || (modulus_len < hLen + saltlen + 2)) {
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61 return CRYPT_PK_INVALID_SIZE;
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62 }
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63
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64 /* allocate ram for DB/mask/salt/hash of size modulus_len */
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65 DB = XMALLOC(modulus_len);
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66 mask = XMALLOC(modulus_len);
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67 salt = XMALLOC(modulus_len);
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68 hash = XMALLOC(modulus_len);
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69 if (DB == NULL || mask == NULL || salt == NULL || hash == NULL) {
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70 if (DB != NULL) {
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71 XFREE(DB);
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72 }
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73 if (mask != NULL) {
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74 XFREE(mask);
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75 }
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76 if (salt != NULL) {
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77 XFREE(salt);
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78 }
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79 if (hash != NULL) {
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80 XFREE(hash);
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81 }
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82 return CRYPT_MEM;
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83 }
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84
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85
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86 /* generate random salt */
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87 if (saltlen > 0) {
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88 if (prng_descriptor[prng_idx].read(salt, saltlen, prng) != saltlen) {
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89 err = CRYPT_ERROR_READPRNG;
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90 goto LBL_ERR;
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91 }
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92 }
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93
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94 /* M = (eight) 0x00 || msghash || salt, hash = H(M) */
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95 if ((err = hash_descriptor[hash_idx].init(&md)) != CRYPT_OK) {
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96 goto LBL_ERR;
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97 }
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98 zeromem(DB, 8);
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99 if ((err = hash_descriptor[hash_idx].process(&md, DB, 8)) != CRYPT_OK) {
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100 goto LBL_ERR;
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101 }
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102 if ((err = hash_descriptor[hash_idx].process(&md, msghash, msghashlen)) != CRYPT_OK) {
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103 goto LBL_ERR;
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104 }
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105 if ((err = hash_descriptor[hash_idx].process(&md, salt, saltlen)) != CRYPT_OK) {
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106 goto LBL_ERR;
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107 }
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108 if ((err = hash_descriptor[hash_idx].done(&md, hash)) != CRYPT_OK) {
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109 goto LBL_ERR;
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110 }
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111
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112 /* generate DB = PS || 0x01 || salt, PS == modulus_len - saltlen - hLen - 2 zero bytes */
209
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113 x = 0;
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114 XMEMSET(DB + x, 0, modulus_len - saltlen - hLen - 2);
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115 x += modulus_len - saltlen - hLen - 2;
191
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116 DB[x++] = 0x01;
209
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117 XMEMCPY(DB + x, salt, saltlen);
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118 x += saltlen;
191
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119
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120 /* generate mask of length modulus_len - hLen - 1 from hash */
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121 if ((err = pkcs_1_mgf1(hash, hLen, hash_idx, mask, modulus_len - hLen - 1)) != CRYPT_OK) {
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122 goto LBL_ERR;
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123 }
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124
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125 /* xor against DB */
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126 for (y = 0; y < (modulus_len - hLen - 1); y++) {
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127 DB[y] ^= mask[y];
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128 }
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129
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130 /* output is DB || hash || 0xBC */
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131 if (*outlen < modulus_len) {
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132 err = CRYPT_BUFFER_OVERFLOW;
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133 goto LBL_ERR;
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134 }
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135
209
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136 /* DB len = modulus_len - hLen - 1 */
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137 y = 0;
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138 XMEMCPY(out + y, DB, modulus_len - hLen - 1);
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139 y += modulus_len - hLen - 1;
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140
191
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141 /* hash */
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142 XMEMCPY(out + y, hash, hLen);
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143 y += hLen;
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144
191
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145 /* 0xBC */
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146 out[y] = 0xBC;
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147
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148 /* now clear the 8*modulus_len - modulus_bitlen most significant bits */
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149 out[0] &= 0xFF >> ((modulus_len<<3) - (modulus_bitlen-1));
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150
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151 /* store output size */
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152 *outlen = modulus_len;
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153 err = CRYPT_OK;
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154 LBL_ERR:
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155 #ifdef LTC_CLEAN_STACK
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156 zeromem(DB, modulus_len);
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157 zeromem(mask, modulus_len);
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158 zeromem(salt, modulus_len);
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159 zeromem(hash, modulus_len);
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160 #endif
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161
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162 XFREE(hash);
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163 XFREE(salt);
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164 XFREE(mask);
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165 XFREE(DB);
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166
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167 return err;
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168 }
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169
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170 #endif /* PKCS_1 */
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171
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172 /* $Source: /cvs/libtom/libtomcrypt/src/pk/pkcs1/pkcs_1_pss_encode.c,v $ */
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173 /* $Revision: 1.4 $ */
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174 /* $Date: 2005/05/05 14:35:59 $ */