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