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#ifndef LIGHTNING_BITCOIN_SIGNATURE_H
#define LIGHTNING_BITCOIN_SIGNATURE_H
#include "config.h"
#include <ccan/short_types/short_types.h>
#include <secp256k1.h>
#include <stdbool.h>
enum sighash_type {
SIGHASH_ALL = 1,
SIGHASH_NONE = 2,
SIGHASH_SINGLE = 3,
SIGHASH_ANYONECANPAY = 0x80
};
/* ECDSA of double SHA256. */
struct signature {
secp256k1_ecdsa_signature sig;
};
struct sha256_double;
struct bitcoin_tx;
struct pubkey;
struct privkey;
struct bitcoin_tx_output;
struct bitcoin_signature;
void sign_hash(secp256k1_context *secpctx,
const struct privkey *p,
const struct sha256_double *h,
struct signature *s);
bool check_signed_hash(secp256k1_context *secpctx,
const struct sha256_double *hash,
const struct signature *signature,
const struct pubkey *key);
/* All tx input scripts must be set to 0 len. */
void sign_tx_input(secp256k1_context *secpctx,
struct bitcoin_tx *tx,
unsigned int in,
const u8 *subscript, size_t subscript_len,
const u8 *witness,
const struct privkey *privkey, const struct pubkey *pubkey,
struct signature *sig);
/* Does this sig sign the tx with this input for this pubkey. */
bool check_tx_sig(secp256k1_context *secpctx,
struct bitcoin_tx *tx, size_t input_num,
const u8 *redeemscript, size_t redeemscript_len,
const u8 *witness,
const struct pubkey *key,
const struct bitcoin_signature *sig);
/* Signature must have low S value. */
bool sig_valid(secp256k1_context *secpctx, const struct signature *sig);
/* Give DER encoding of signature: returns length used (<= 72). */
size_t signature_to_der(secp256k1_context *secpctx,
u8 der[72], const struct signature *s);
#endif /* LIGHTNING_BITCOIN_SIGNATURE_H */