Function check_signed_hash

bitcoin/signature.c:182–200

}

bool check_signed_hash(const struct sha256_double *hash,
		       const secp256k1_ecdsa_signature *signature,
		       const struct pubkey *key)
{
	int ret;

	/* BOLT #2:
	 *
	 * - if `signature` is incorrect OR non-compliant with
	 *   LOW-S-standard rule
	 */
	/* From the secp256k1_ecdsa_verify documentation: "To avoid
	 * accepting malleable signatures, only ECDSA signatures in
	 * lower-S form are accepted." */
	ret = secp256k1_ecdsa_verify(secp256k1_ctx,
				     signature,
				     hash->sha.u.u8, &key->pubkey);
	return ret == 1;
}

bool check_tx_sig(const struct bitcoin_tx *tx, size_t input_num,
		  const u8 *redeemscript,