Mercurial > dropbear

annotate src/pk/dsa/dsa_verify_hash.c @ 381:999a5eb4ed10 libtomcrypt-dropbear

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
propagate from branch 'au.asn.ucc.matt.ltc.orig' (head 52840647ac7f5c707c3bd158d119a15734a7ef28) to branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
author Matt Johnston <matt@ucc.asn.au>
date Thu, 11 Jan 2007 02:39:21 +0000
parents d5faf4814ddb
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.
Matt Johnston <matt@ucc.asn.au>
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2 *
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
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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.
Matt Johnston <matt@ucc.asn.au>
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6 * The library is free for all purposes without any express
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
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7 * guarantee it works.
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
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8 *
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9 * Tom St Denis, [email protected], http://libtomcrypt.com
280
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
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10 */
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Matt Johnston <matt@ucc.asn.au>
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11 #include "tomcrypt.h"
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12
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Matt Johnston <matt@ucc.asn.au>
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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
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
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16 */
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
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17
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
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18
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
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19 #ifdef MDSA
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
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20
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
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21 /**
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
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22 Verify a DSA signature
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
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23 @param r DSA "r" parameter
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Matt Johnston <matt@ucc.asn.au>
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24 @param s DSA "s" parameter
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Matt Johnston <matt@ucc.asn.au>
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25 @param hash The hash that was signed
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
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26 @param hashlen The length of the hash that was signed
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
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27 @param stat [out] The result of the signature verification, 1==valid, 0==invalid
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
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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)
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
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30 */
380
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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)
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
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34 {
380
d5faf4814ddb Update to LibTomCrypt 1.16
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35 void *w, *v, *u1, *u2;
280
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
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36 int err;
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
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37
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
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38 LTC_ARGCHK(r != NULL);
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
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39 LTC_ARGCHK(s != NULL);
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
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40 LTC_ARGCHK(stat != NULL);
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
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41 LTC_ARGCHK(key != NULL);
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42
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
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43 /* default to invalid signature */
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
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44 *stat = 0;
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
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45
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
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46 /* init our variables */
380
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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
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
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49 }
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
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50
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
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51 /* neither r or s can be null or >q*/
380
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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) {
280
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
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53 err = CRYPT_INVALID_PACKET;
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54 goto error;
280
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55 }
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56
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
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57 /* w = 1/s mod q */
380
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58 if ((err = mp_invmod(s, key->q, w)) != CRYPT_OK) { goto error; }
280
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59
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
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60 /* u1 = m * w mod q */
380
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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; }
280
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63
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64 /* u2 = r*w mod q */
380
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65 if ((err = mp_mulmod(r, w, key->q, u2)) != CRYPT_OK) { goto error; }
280
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66
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67 /* v = g^u1 * y^u2 mod p mod q */
380
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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; }
280
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72
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
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73 /* if r = v then we're set */
380
d5faf4814ddb Update to LibTomCrypt 1.16
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74 if (mp_cmp(r, v) == LTC_MP_EQ) {
280
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75 *stat = 1;
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
76 }
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
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diff changeset
77
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
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78 err = CRYPT_OK;
380
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diff changeset
79 error:
d5faf4814ddb Update to LibTomCrypt 1.16
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80 mp_clear_multi(w, v, u1, u2, NULL);
280
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
81 return err;
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
parents:
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82 }
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
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83
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
parents:
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84 /**
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Matt Johnston <matt@ucc.asn.au>
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85 Verify a DSA signature
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Matt Johnston <matt@ucc.asn.au>
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86 @param sig The signature
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Matt Johnston <matt@ucc.asn.au>
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87 @param siglen The length of the signature (octets)
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Matt Johnston <matt@ucc.asn.au>
parents:
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88 @param hash The hash that was signed
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parents:
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89 @param hashlen The length of the hash that was signed
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
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parents:
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90 @param stat [out] The result of the signature verification, 1==valid, 0==invalid
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
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parents:
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91 @param key The corresponding public DH key
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
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parents:
diff changeset
92 @return CRYPT_OK if successful (even if the signature is invalid)
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
93 */
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
94 int dsa_verify_hash(const unsigned char *sig, unsigned long siglen,
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
95 const unsigned char *hash, unsigned long hashlen,
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
96 int *stat, dsa_key *key)
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
97 {
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
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parents:
diff changeset
98 int err;
380
d5faf4814ddb Update to LibTomCrypt 1.16
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parents: 280
diff changeset
99 void *r, *s;
280
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
100
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
101 if ((err = mp_init_multi(&r, &s, NULL)) != CRYPT_OK) {
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
102 return CRYPT_MEM;
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
103 }
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
104
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
105 /* decode the sequence */
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
106 if ((err = der_decode_sequence_multi(sig, siglen,
380
d5faf4814ddb Update to LibTomCrypt 1.16
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parents: 280
diff changeset
107 LTC_ASN1_INTEGER, 1UL, r,
d5faf4814ddb Update to LibTomCrypt 1.16
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diff changeset
108 LTC_ASN1_INTEGER, 1UL, s,
280
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
109 LTC_ASN1_EOL, 0UL, NULL)) != CRYPT_OK) {
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
110 goto LBL_ERR;
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
111 }
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
112
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
113 /* do the op */
380
d5faf4814ddb Update to LibTomCrypt 1.16
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diff changeset
114 err = dsa_verify_hash_raw(r, s, hash, hashlen, stat, key);
280
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
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parents:
diff changeset
115
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
116 LBL_ERR:
380
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117 mp_clear_multi(r, s, NULL);
280
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Matt Johnston <matt@ucc.asn.au>
parents:
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118 return err;
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
119 }
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
120
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
121 #endif
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122
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
123
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
124 /* $Source: /cvs/libtom/libtomcrypt/src/pk/dsa/dsa_verify_hash.c,v $ */
380
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parents: 280
diff changeset
125 /* $Revision: 1.13 $ */
d5faf4814ddb Update to LibTomCrypt 1.16
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diff changeset
126 /* $Date: 2006/12/04 03:18:43 $ */