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Merge pull request #278 from libtom/pr/fix-dsa-wycheproof

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DSA wycheproof tests
This commit is contained in:
karel-m 2017-09-10 14:00:54 +02:00 committed by GitHub
commit 32d60ac134
1 changed files with 13 additions and 6 deletions
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19
src/pk/dsa/dsa_verify_hash.c
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@ -47,7 +47,7 @@ int dsa_verify_hash_raw( void *r, void *s,
}
/* neither r or s can be null or >q*/
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) {
if (mp_cmp_d(r, 0) != LTC_MP_GT || mp_cmp_d(s, 0) != LTC_MP_GT || mp_cmp(r, key->q) != LTC_MP_LT || mp_cmp(s, key->q) != LTC_MP_LT) {
err = CRYPT_INVALID_PACKET;
goto error;
}
@ -98,16 +98,23 @@ int dsa_verify_hash(const unsigned char *sig, unsigned long siglen,
{
int err;
void *r, *s;
ltc_asn1_list sig_seq[2];
unsigned long reallen = 0;
if ((err = mp_init_multi(&r, &s, NULL)) != CRYPT_OK) {
return err;
}
/* decode the sequence */
if ((err = der_decode_sequence_multi(sig, siglen,
LTC_ASN1_INTEGER, 1UL, r,
LTC_ASN1_INTEGER, 1UL, s,
LTC_ASN1_EOL, 0UL, NULL)) != CRYPT_OK) {
LTC_SET_ASN1(sig_seq, 0, LTC_ASN1_INTEGER, r, 1UL);
LTC_SET_ASN1(sig_seq, 1, LTC_ASN1_INTEGER, s, 1UL);
err = der_decode_sequence(sig, siglen, sig_seq, 2);
if (err != CRYPT_OK) {
goto LBL_ERR;
}
err = der_length_sequence(sig_seq, 2, &reallen);
if (err != CRYPT_OK || reallen != siglen) {
goto LBL_ERR;
}