int ECDSA_sign_ex(int type, const uint8_t *digest, size_t digest_len,
uint8_t *sig, unsigned int *sig_len, const BIGNUM *kinv,
const BIGNUM *r, EC_KEY *eckey) {
int ret = 0;
ECDSA_SIG *s = NULL;
s = ECDSA_do_sign_ex(digest, digest_len, kinv, r, eckey);
if (s == NULL) {
*sig_len = 0;
goto err;
}
CBB cbb;
CBB_zero(&cbb);
size_t len;
if (!CBB_init_fixed(&cbb, sig, ECDSA_size(eckey)) ||
!ECDSA_SIG_marshal(&cbb, s) ||
!CBB_finish(&cbb, NULL, &len)) {
OPENSSL_PUT_ERROR(ECDSA, ECDSA_R_ENCODE_ERROR);
CBB_cleanup(&cbb);
*sig_len = 0;
goto err;
}
*sig_len = (unsigned)len;
ret = 1;
err:
ECDSA_SIG_free(s);
return ret;
}
int i2d_ECDSA_SIG(const ECDSA_SIG *sig, uint8_t **outp) {
CBB cbb;
if (!CBB_init(&cbb, 0) ||
!ECDSA_SIG_marshal(&cbb, sig)) {
CBB_cleanup(&cbb);
return -1;
}
return CBB_finish_i2d(&cbb, outp);
}
int ECDSA_SIG_to_bytes(uint8_t **out_bytes, size_t *out_len,
const ECDSA_SIG *sig) {
CBB cbb;
CBB_zero(&cbb);
if (!CBB_init(&cbb, 0) ||
!ECDSA_SIG_marshal(&cbb, sig) ||
!CBB_finish(&cbb, out_bytes, out_len)) {
OPENSSL_PUT_ERROR(ECDSA, ECDSA_R_ENCODE_ERROR);
CBB_cleanup(&cbb);
return 0;
}
return 1;
}
