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annotate src/pk/dsa/dsa_sign_hash.c @ 209:39d5d58461d6 libtomcrypt-orig LTC_1.05

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Import of libtomcrypt 1.05
author Matt Johnston <matt@ucc.asn.au>
date Wed, 06 Jul 2005 03:53:40 +0000
parents 1c15b283127b
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
191
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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
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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 dsa_sign_hash.c
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15 DSA implementation, sign a hash, Tom St Denis
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16 */
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17
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18 #ifdef MDSA
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19
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20 /**
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21 Sign a hash with DSA
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22 @param in The hash to sign
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23 @param inlen The length of the hash to sign
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24 @param r The "r" integer of the signature (caller must initialize with mp_init() first)
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25 @param s The "s" integer of the signature (caller must initialize with mp_init() first)
191
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26 @param prng An active PRNG state
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27 @param wprng The index of the PRNG desired
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28 @param key A private DSA key
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29 @return CRYPT_OK if successful
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30 */
209
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31 int dsa_sign_hash_raw(const unsigned char *in, unsigned long inlen,
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32 mp_int *r, mp_int *s,
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33 prng_state *prng, int wprng, dsa_key *key)
191
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34 {
209
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35 mp_int k, kinv, tmp;
191
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36 unsigned char *buf;
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37 int err;
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38
209
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39 LTC_ARGCHK(in != NULL);
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40 LTC_ARGCHK(r != NULL);
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41 LTC_ARGCHK(s != NULL);
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42 LTC_ARGCHK(key != NULL);
191
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43
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44 if ((err = prng_is_valid(wprng)) != CRYPT_OK) {
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45 return err;
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46 }
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47 if (key->type != PK_PRIVATE) {
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48 return CRYPT_PK_NOT_PRIVATE;
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49 }
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50
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51 /* check group order size */
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52 if (key->qord >= MDSA_MAX_GROUP) {
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53 return CRYPT_INVALID_ARG;
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54 }
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55
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56 buf = XMALLOC(MDSA_MAX_GROUP);
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57 if (buf == NULL) {
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58 return CRYPT_MEM;
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59 }
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60
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61 /* Init our temps */
209
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62 if ((err = mp_init_multi(&k, &kinv, &tmp, NULL)) != MP_OKAY) { goto error; }
191
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63
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64 retry:
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65
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66 do {
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67 /* gen random k */
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68 if (prng_descriptor[wprng].read(buf, key->qord, prng) != (unsigned long)key->qord) {
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69 err = CRYPT_ERROR_READPRNG;
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70 goto LBL_ERR;
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71 }
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72
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73 /* read k */
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74 if ((err = mp_read_unsigned_bin(&k, buf, key->qord)) != MP_OKAY) { goto error; }
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75
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76 /* k > 1 ? */
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77 if (mp_cmp_d(&k, 1) != MP_GT) { goto retry; }
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78
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79 /* test gcd */
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80 if ((err = mp_gcd(&k, &key->q, &tmp)) != MP_OKAY) { goto error; }
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81 } while (mp_cmp_d(&tmp, 1) != MP_EQ);
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82
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83 /* now find 1/k mod q */
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84 if ((err = mp_invmod(&k, &key->q, &kinv)) != MP_OKAY) { goto error; }
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85
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86 /* now find r = g^k mod p mod q */
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87 if ((err = mp_exptmod(&key->g, &k, &key->p, r)) != MP_OKAY) { goto error; }
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88 if ((err = mp_mod(r, &key->q, r)) != MP_OKAY) { goto error; }
191
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89
209
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90 if (mp_iszero(r) == MP_YES) { goto retry; }
191
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91
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92 /* now find s = (in + xr)/k mod q */
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93 if ((err = mp_read_unsigned_bin(&tmp, (unsigned char *)in, inlen)) != MP_OKAY) { goto error; }
209
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94 if ((err = mp_mul(&key->x, r, s)) != MP_OKAY) { goto error; }
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95 if ((err = mp_add(s, &tmp, s)) != MP_OKAY) { goto error; }
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96 if ((err = mp_mulmod(s, &kinv, &key->q, s)) != MP_OKAY) { goto error; }
191
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97
209
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98 if (mp_iszero(s) == MP_YES) { goto retry; }
191
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99
209
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100 err = CRYPT_OK;
191
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101 goto LBL_ERR;
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102
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103 error:
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104 err = mpi_to_ltc_error(err);
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105 LBL_ERR:
209
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106 mp_clear_multi(&k, &kinv, &tmp, NULL);
191
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107 #ifdef LTC_CLEAN_STACK
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108 zeromem(buf, MDSA_MAX_GROUP);
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109 #endif
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110 XFREE(buf);
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111 return err;
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112 }
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113
209
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114 /**
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115 Sign a hash with DSA
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116 @param in The hash to sign
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117 @param inlen The length of the hash to sign
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118 @param out [out] Where to store the signature
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119 @param outlen [in/out] The max size and resulting size of the signature
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120 @param prng An active PRNG state
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121 @param wprng The index of the PRNG desired
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122 @param key A private DSA key
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123 @return CRYPT_OK if successful
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124 */
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125 int dsa_sign_hash(const unsigned char *in, unsigned long inlen,
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126 unsigned char *out, unsigned long *outlen,
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127 prng_state *prng, int wprng, dsa_key *key)
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128 {
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129 mp_int r, s;
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130 int err;
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131
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132 LTC_ARGCHK(in != NULL);
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133 LTC_ARGCHK(out != NULL);
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134 LTC_ARGCHK(outlen != NULL);
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135 LTC_ARGCHK(key != NULL);
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136
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137 if (mp_init_multi(&r, &s, NULL) != MP_OKAY) {
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138 return CRYPT_MEM;
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139 }
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140
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141 if ((err = dsa_sign_hash_raw(in, inlen, &r, &s, prng, wprng, key)) != CRYPT_OK) {
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142 goto LBL_ERR;
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143 }
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144
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145 err = der_encode_sequence_multi(out, outlen,
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146 LTC_ASN1_INTEGER, 1UL, &r,
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147 LTC_ASN1_INTEGER, 1UL, &s,
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148 LTC_ASN1_EOL, 0UL, NULL);
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149
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150 LBL_ERR:
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151 mp_clear_multi(&r, &s, NULL);
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152 return err;
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153 }
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154
191
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155 #endif
209
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156
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157 /* $Source: /cvs/libtom/libtomcrypt/src/pk/dsa/dsa_sign_hash.c,v $ */
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158 /* $Revision: 1.6 $ */
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159 /* $Date: 2005/05/15 21:48:59 $ */