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annotate src/pk/dsa/dsa_sign_hash.c @ 380:d5faf4814ddb libtomcrypt-orig libtomcrypt-1.16

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Update to LibTomCrypt 1.16
author Matt Johnston <matt@ucc.asn.au>
date Thu, 11 Jan 2007 02:22:00 +0000
parents 59400faa4b44
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
280
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
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2 *
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
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3 * LibTomCrypt is a library that provides various cryptographic
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
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4 * algorithms in a highly modular and flexible manner.
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5 *
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
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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.com
280
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10 */
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11 #include "tomcrypt.h"
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12
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
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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
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
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18 #ifdef MDSA
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19
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
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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)
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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 */
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31 int dsa_sign_hash_raw(const unsigned char *in, unsigned long inlen,
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32 void *r, void *s,
280
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33 prng_state *prng, int wprng, dsa_key *key)
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
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34 {
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35 void *k, *kinv, *tmp;
280
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36 unsigned char *buf;
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37 int err;
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38
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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);
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43
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44 if ((err = prng_is_valid(wprng)) != CRYPT_OK) {
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
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45 return err;
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46 }
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
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47 if (key->type != PK_PRIVATE) {
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
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48 return CRYPT_PK_NOT_PRIVATE;
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
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49 }
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
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50
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
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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;
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
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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;
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
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59 }
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60
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
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61 /* Init our temps */
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62 if ((err = mp_init_multi(&k, &kinv, &tmp, NULL)) != CRYPT_OK) { goto ERRBUF; }
280
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63
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
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64 retry:
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
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65
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
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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 error;
280
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71 }
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72
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73 /* read k */
380
d5faf4814ddb Update to LibTomCrypt 1.16
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74 if ((err = mp_read_unsigned_bin(k, buf, key->qord)) != CRYPT_OK) { goto error; }
280
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75
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
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76 /* k > 1 ? */
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d5faf4814ddb Update to LibTomCrypt 1.16
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77 if (mp_cmp_d(k, 1) != LTC_MP_GT) { goto retry; }
280
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78
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79 /* test gcd */
380
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80 if ((err = mp_gcd(k, key->q, tmp)) != CRYPT_OK) { goto error; }
d5faf4814ddb Update to LibTomCrypt 1.16
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81 } while (mp_cmp_d(tmp, 1) != LTC_MP_EQ);
280
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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)) != CRYPT_OK) { goto error; }
280
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85
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
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86 /* now find r = g^k mod p mod q */
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d5faf4814ddb Update to LibTomCrypt 1.16
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87 if ((err = mp_exptmod(key->g, k, key->p, r)) != CRYPT_OK) { goto error; }
d5faf4814ddb Update to LibTomCrypt 1.16
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88 if ((err = mp_mod(r, key->q, r)) != CRYPT_OK) { goto error; }
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89
380
d5faf4814ddb Update to LibTomCrypt 1.16
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90 if (mp_iszero(r) == LTC_MP_YES) { goto retry; }
280
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91
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
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diff changeset
92 /* now find s = (in + xr)/k mod q */
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d5faf4814ddb Update to LibTomCrypt 1.16
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parents: 280
diff changeset
93 if ((err = mp_read_unsigned_bin(tmp, (unsigned char *)in, inlen)) != CRYPT_OK) { goto error; }
d5faf4814ddb Update to LibTomCrypt 1.16
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parents: 280
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94 if ((err = mp_mul(key->x, r, s)) != CRYPT_OK) { goto error; }
d5faf4814ddb Update to LibTomCrypt 1.16
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parents: 280
diff changeset
95 if ((err = mp_add(s, tmp, s)) != CRYPT_OK) { goto error; }
d5faf4814ddb Update to LibTomCrypt 1.16
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parents: 280
diff changeset
96 if ((err = mp_mulmod(s, kinv, key->q, s)) != CRYPT_OK) { goto error; }
280
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parents:
diff changeset
97
380
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parents: 280
diff changeset
98 if (mp_iszero(s) == LTC_MP_YES) { goto retry; }
280
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
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diff changeset
99
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
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diff changeset
100 err = CRYPT_OK;
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
101 error:
380
d5faf4814ddb Update to LibTomCrypt 1.16
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102 mp_clear_multi(k, kinv, tmp, NULL);
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diff changeset
103 ERRBUF:
280
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104 #ifdef LTC_CLEAN_STACK
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105 zeromem(buf, MDSA_MAX_GROUP);
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106 #endif
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107 XFREE(buf);
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Matt Johnston <matt@ucc.asn.au>
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108 return err;
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
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diff changeset
109 }
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
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diff changeset
110
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
111 /**
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
112 Sign a hash with DSA
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113 @param in The hash to sign
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diff changeset
114 @param inlen The length of the hash to sign
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115 @param out [out] Where to store the signature
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116 @param outlen [in/out] The max size and resulting size of the signature
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diff changeset
117 @param prng An active PRNG state
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parents:
diff changeset
118 @param wprng The index of the PRNG desired
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
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diff changeset
119 @param key A private DSA key
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120 @return CRYPT_OK if successful
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Matt Johnston <matt@ucc.asn.au>
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121 */
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122 int dsa_sign_hash(const unsigned char *in, unsigned long inlen,
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123 unsigned char *out, unsigned long *outlen,
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124 prng_state *prng, int wprng, dsa_key *key)
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
125 {
380
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diff changeset
126 void *r, *s;
280
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127 int err;
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
parents:
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128
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129 LTC_ARGCHK(in != NULL);
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130 LTC_ARGCHK(out != NULL);
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
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diff changeset
131 LTC_ARGCHK(outlen != NULL);
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
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132 LTC_ARGCHK(key != NULL);
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
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diff changeset
133
380
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diff changeset
134 if (mp_init_multi(&r, &s, NULL) != CRYPT_OK) {
280
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parents:
diff changeset
135 return CRYPT_MEM;
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
136 }
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
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diff changeset
137
380
d5faf4814ddb Update to LibTomCrypt 1.16
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diff changeset
138 if ((err = dsa_sign_hash_raw(in, inlen, r, s, prng, wprng, key)) != CRYPT_OK) {
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139 goto error;
280
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140 }
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141
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142 err = der_encode_sequence_multi(out, outlen,
380
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143 LTC_ASN1_INTEGER, 1UL, r,
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144 LTC_ASN1_INTEGER, 1UL, s,
280
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145 LTC_ASN1_EOL, 0UL, NULL);
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146
380
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147 error:
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148 mp_clear_multi(r, s, NULL);
280
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149 return err;
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150 }
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151
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152 #endif
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153
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154 /* $Source: /cvs/libtom/libtomcrypt/src/pk/dsa/dsa_sign_hash.c,v $ */
380
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155 /* $Revision: 1.12 $ */
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156 /* $Date: 2006/12/04 22:27:56 $ */