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dsa_verify_hash: fix wycheproof - appending unused 0's

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This commit is contained in:
Karel Miko 2017-08-29 23:25:05 +02:00
parent 7e4bd971de
commit c927e4315a
1 changed files with 12 additions and 5 deletions
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17
src/pk/dsa/dsa_verify_hash.c
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@ -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;
}