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annotate src/pk/dsa/dsa_verify_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.
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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.com
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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_verify_hash.c
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15 DSA implementation, verify a signature, Tom St Denis
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16 */
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17
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18
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19 #ifdef MDSA
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20
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21 /**
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22 Verify a DSA signature
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23 @param r DSA "r" parameter
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24 @param s DSA "s" parameter
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25 @param hash The hash that was signed
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26 @param hashlen The length of the hash that was signed
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27 @param stat [out] The result of the signature verification, 1==valid, 0==invalid
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28 @param key The corresponding public DH key
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29 @return CRYPT_OK if successful (even if the signature is invalid)
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30 */
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31 int dsa_verify_hash_raw( void *r, void *s,
280
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32 const unsigned char *hash, unsigned long hashlen,
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33 int *stat, dsa_key *key)
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34 {
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35 void *w, *v, *u1, *u2;
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36 int err;
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37
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38 LTC_ARGCHK(r != NULL);
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39 LTC_ARGCHK(s != NULL);
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40 LTC_ARGCHK(stat != NULL);
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41 LTC_ARGCHK(key != NULL);
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42
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43 /* default to invalid signature */
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44 *stat = 0;
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45
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46 /* init our variables */
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47 if ((err = mp_init_multi(&w, &v, &u1, &u2, NULL)) != CRYPT_OK) {
d5faf4814ddb Update to LibTomCrypt 1.16
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48 return err;
280
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49 }
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50
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51 /* neither r or s can be null or >q*/
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52 if (mp_iszero(r) == LTC_MP_YES || mp_iszero(s) == LTC_MP_YES || mp_cmp(r, key->q) != LTC_MP_LT || mp_cmp(s, key->q) != LTC_MP_LT) {
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53 err = CRYPT_INVALID_PACKET;
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54 goto error;
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55 }
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56
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57 /* w = 1/s mod q */
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58 if ((err = mp_invmod(s, key->q, w)) != CRYPT_OK) { goto error; }
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59
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60 /* u1 = m * w mod q */
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61 if ((err = mp_read_unsigned_bin(u1, (unsigned char *)hash, hashlen)) != CRYPT_OK) { goto error; }
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62 if ((err = mp_mulmod(u1, w, key->q, u1)) != CRYPT_OK) { goto error; }
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63
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64 /* u2 = r*w mod q */
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65 if ((err = mp_mulmod(r, w, key->q, u2)) != CRYPT_OK) { goto error; }
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66
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67 /* v = g^u1 * y^u2 mod p mod q */
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68 if ((err = mp_exptmod(key->g, u1, key->p, u1)) != CRYPT_OK) { goto error; }
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69 if ((err = mp_exptmod(key->y, u2, key->p, u2)) != CRYPT_OK) { goto error; }
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70 if ((err = mp_mulmod(u1, u2, key->p, v)) != CRYPT_OK) { goto error; }
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71 if ((err = mp_mod(v, key->q, v)) != CRYPT_OK) { goto error; }
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72
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73 /* if r = v then we're set */
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74 if (mp_cmp(r, v) == LTC_MP_EQ) {
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75 *stat = 1;
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76 }
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77
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78 err = CRYPT_OK;
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79 error:
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80 mp_clear_multi(w, v, u1, u2, NULL);
280
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81 return err;
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82 }
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83
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84 /**
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85 Verify a DSA signature
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86 @param sig The signature
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87 @param siglen The length of the signature (octets)
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88 @param hash The hash that was signed
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89 @param hashlen The length of the hash that was signed
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90 @param stat [out] The result of the signature verification, 1==valid, 0==invalid
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91 @param key The corresponding public DH key
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92 @return CRYPT_OK if successful (even if the signature is invalid)
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93 */
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94 int dsa_verify_hash(const unsigned char *sig, unsigned long siglen,
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95 const unsigned char *hash, unsigned long hashlen,
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96 int *stat, dsa_key *key)
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97 {
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98 int err;
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99 void *r, *s;
280
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100
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101 if ((err = mp_init_multi(&r, &s, NULL)) != CRYPT_OK) {
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102 return CRYPT_MEM;
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103 }
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104
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105 /* decode the sequence */
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106 if ((err = der_decode_sequence_multi(sig, siglen,
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107 LTC_ASN1_INTEGER, 1UL, r,
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108 LTC_ASN1_INTEGER, 1UL, s,
280
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109 LTC_ASN1_EOL, 0UL, NULL)) != CRYPT_OK) {
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110 goto LBL_ERR;
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111 }
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112
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113 /* do the op */
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114 err = dsa_verify_hash_raw(r, s, hash, hashlen, stat, key);
280
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115
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116 LBL_ERR:
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117 mp_clear_multi(r, s, NULL);
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118 return err;
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119 }
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120
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121 #endif
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122
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123
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124 /* $Source: /cvs/libtom/libtomcrypt/src/pk/dsa/dsa_verify_hash.c,v $ */
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125 /* $Revision: 1.13 $ */
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126 /* $Date: 2006/12/04 03:18:43 $ */