int DSA_check_signature(int *out_valid, const uint8_t *digest,
size_t digest_len, const uint8_t *sig, size_t sig_len,
const DSA *dsa) {
DSA_SIG *s = NULL;
int ret = 0;
uint8_t *der = NULL;
s = DSA_SIG_new();
if (s == NULL) {
goto err;
}
const uint8_t *sigp = sig;
if (d2i_DSA_SIG(&s, &sigp, sig_len) == NULL || sigp != sig + sig_len) {
goto err;
}
/* Ensure that the signature uses DER and doesn't have trailing garbage. */
int der_len = i2d_DSA_SIG(s, &der);
if (der_len < 0 || (size_t)der_len != sig_len || memcmp(sig, der, sig_len)) {
goto err;
}
ret = DSA_do_check_signature(out_valid, digest, digest_len, s, dsa);
err:
OPENSSL_free(der);
DSA_SIG_free(s);
return ret;
}
int DSA_verify(int type, const uint8_t *digest, size_t digest_len,
const uint8_t *sig, size_t sig_len, const DSA *dsa) {
DSA_SIG *s = NULL;
int ret = -1, valid;
s = DSA_SIG_new();
if (s == NULL) {
goto err;
}
if (d2i_DSA_SIG(&s, &sig, sig_len) == NULL) {
goto err;
}
if (!DSA_do_check_signature(&valid, digest, digest_len, s, dsa)) {
goto err;
}
ret = valid;
err:
if (s) {
DSA_SIG_free(s);
}
return ret;
}
int DSA_do_verify(const uint8_t *digest, size_t digest_len, DSA_SIG *sig,
const DSA *dsa) {
int valid;
if (!DSA_do_check_signature(&valid, digest, digest_len, sig, dsa)) {
return -1;
}
return valid;
}
int DSA_check_signature(int *out_valid, const uint8_t *digest,
size_t digest_len, const uint8_t *sig, size_t sig_len,
const DSA *dsa) {
DSA_SIG *s = NULL;
int ret = 0;
s = DSA_SIG_new();
if (s == NULL) {
goto err;
}
if (d2i_DSA_SIG(&s, &sig, sig_len) == NULL) {
goto err;
}
ret = DSA_do_check_signature(out_valid, digest, digest_len, s, dsa);
err:
if (s) {
DSA_SIG_free(s);
}
return ret;
}
