Mercurial > dropbear

annotate src/pk/pkcs1/pkcs_1_pss_decode.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
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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
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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_decode.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 PSS decode
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22 @param msghash The hash to verify
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23 @param msghashlen The length of the hash (octets)
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24 @param sig The signature data (encoded data)
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25 @param siglen The length of the signature data (octets)
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26 @param saltlen The length of the salt used (octets)
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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 res [out] The result of the comparison, 1==valid, 0==invalid
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30 @return CRYPT_OK if successful (even if the comparison failed)
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31 */
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32 int pkcs_1_pss_decode(const unsigned char *msghash, unsigned long msghashlen,
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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33 const unsigned char *sig, unsigned long siglen,
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34 unsigned long saltlen, int hash_idx,
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35 unsigned long modulus_bitlen, int *res)
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36 {
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37 unsigned char *DB, *mask, *salt, *hash;
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38 unsigned long x, y, hLen, modulus_len;
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39 int err;
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40 hash_state md;
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41
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42 LTC_ARGCHK(msghash != NULL);
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43 LTC_ARGCHK(res != NULL);
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44
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45 /* default to invalid */
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46 *res = 0;
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47
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48 /* ensure hash is 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
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53 hLen = hash_descriptor[hash_idx].hashsize;
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54 modulus_len = (modulus_bitlen>>3) + (modulus_bitlen & 7 ? 1 : 0);
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55
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56 /* check sizes */
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57 if ((saltlen > modulus_len) ||
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58 (modulus_len < hLen + saltlen + 2) || (siglen != modulus_len)) {
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59 return CRYPT_PK_INVALID_SIZE;
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60 }
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61
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62 /* allocate ram for DB/mask/salt/hash of size modulus_len */
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63 DB = XMALLOC(modulus_len);
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64 mask = XMALLOC(modulus_len);
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65 salt = XMALLOC(modulus_len);
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66 hash = XMALLOC(modulus_len);
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67 if (DB == NULL || mask == NULL || salt == NULL || hash == NULL) {
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68 if (DB != NULL) {
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69 XFREE(DB);
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70 }
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71 if (mask != NULL) {
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72 XFREE(mask);
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73 }
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74 if (salt != NULL) {
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75 XFREE(salt);
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76 }
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77 if (hash != NULL) {
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78 XFREE(hash);
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79 }
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80 return CRYPT_MEM;
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81 }
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82
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83 /* ensure the 0xBC byte */
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84 if (sig[siglen-1] != 0xBC) {
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85 err = CRYPT_OK;
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86 goto LBL_ERR;
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87 }
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88
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89 /* copy out the DB */
209
39d5d58461d6 Import of libtomcrypt 1.05
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90 x = 0;
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91 XMEMCPY(DB, sig + x, modulus_len - hLen - 1);
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92 x += modulus_len - hLen - 1;
191
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93
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94 /* copy out the hash */
209
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95 XMEMCPY(hash, sig + x, hLen);
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96 x += hLen;
191
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97
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98 /* check the MSB */
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99 if ((sig[0] & ~(0xFF >> ((modulus_len<<3) - (modulus_bitlen-1)))) != 0) {
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100 err = CRYPT_OK;
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101 goto LBL_ERR;
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102 }
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103
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104 /* generate mask of length modulus_len - hLen - 1 from hash */
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105 if ((err = pkcs_1_mgf1(hash, hLen, hash_idx, mask, modulus_len - hLen - 1)) != CRYPT_OK) {
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106 goto LBL_ERR;
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107 }
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108
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109 /* xor against DB */
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110 for (y = 0; y < (modulus_len - hLen - 1); y++) {
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111 DB[y] ^= mask[y];
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112 }
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113
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114 /* now clear the first byte [make sure smaller than modulus] */
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115 DB[0] &= 0xFF >> ((modulus_len<<3) - (modulus_bitlen-1));
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116
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117 /* DB = PS || 0x01 || salt, PS == modulus_len - saltlen - hLen - 2 zero bytes */
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118
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119 /* check for zeroes and 0x01 */
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120 for (x = 0; x < modulus_len - saltlen - hLen - 2; x++) {
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121 if (DB[x] != 0x00) {
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122 err = CRYPT_OK;
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123 goto LBL_ERR;
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124 }
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125 }
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126
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127 /* check for the 0x01 */
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128 if (DB[x++] != 0x01) {
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129 err = CRYPT_OK;
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130 goto LBL_ERR;
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131 }
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132
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133 /* M = (eight) 0x00 || msghash || salt, mask = H(M) */
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134 if ((err = hash_descriptor[hash_idx].init(&md)) != CRYPT_OK) {
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135 goto LBL_ERR;
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136 }
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137 zeromem(mask, 8);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
138 if ((err = hash_descriptor[hash_idx].process(&md, mask, 8)) != CRYPT_OK) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
139 goto LBL_ERR;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
140 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
141 if ((err = hash_descriptor[hash_idx].process(&md, msghash, msghashlen)) != CRYPT_OK) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
142 goto LBL_ERR;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
143 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
144 if ((err = hash_descriptor[hash_idx].process(&md, DB+x, saltlen)) != CRYPT_OK) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
145 goto LBL_ERR;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
146 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
147 if ((err = hash_descriptor[hash_idx].done(&md, mask)) != CRYPT_OK) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
148 goto LBL_ERR;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
149 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
150
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
151 /* mask == hash means valid signature */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
152 if (memcmp(mask, hash, hLen) == 0) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
153 *res = 1;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
154 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
155
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
156 err = CRYPT_OK;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
157 LBL_ERR:
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
158 #ifdef LTC_CLEAN_STACK
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
159 zeromem(DB, modulus_len);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
160 zeromem(mask, modulus_len);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
161 zeromem(salt, modulus_len);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
162 zeromem(hash, modulus_len);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
163 #endif
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
164
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
165 XFREE(hash);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
166 XFREE(salt);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
167 XFREE(mask);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
168 XFREE(DB);
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
169
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
170 return err;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
171 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
172
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
173 #endif /* PKCS_1 */
209
39d5d58461d6 Import of libtomcrypt 1.05
Matt Johnston <matt@ucc.asn.au>
parents: 191
diff changeset
174
39d5d58461d6 Import of libtomcrypt 1.05
Matt Johnston <matt@ucc.asn.au>
parents: 191
diff changeset
175 /* $Source: /cvs/libtom/libtomcrypt/src/pk/pkcs1/pkcs_1_pss_decode.c,v $ */
39d5d58461d6 Import of libtomcrypt 1.05
Matt Johnston <matt@ucc.asn.au>
parents: 191
diff changeset
176 /* $Revision: 1.4 $ */
39d5d58461d6 Import of libtomcrypt 1.05
Matt Johnston <matt@ucc.asn.au>
parents: 191
diff changeset
177 /* $Date: 2005/05/05 14:35:59 $ */