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a83e45fec2
We currently make sure that all the bitcoin_tx input scripts are NULL and set the input script of the input we're signing, so we can easily reuse the tx hashing code for signature checks. This means that we sometimes jump through hoops to make sure input scripts are NULL, and also means that the tx can't be const. Put more logic inside bitcoin/tx so it can simply ignore things we don't want to hash. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
50 lines
1.4 KiB
C
50 lines
1.4 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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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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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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void sign_hash(const struct privkey *p,
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const struct sha256_double *h,
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secp256k1_ecdsa_signature *s);
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bool check_signed_hash(const struct sha256_double *hash,
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const secp256k1_ecdsa_signature *signature,
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const struct pubkey *key);
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void sign_tx_input(const struct bitcoin_tx *tx,
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unsigned int in,
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const u8 *subscript,
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const u8 *witness,
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const struct privkey *privkey, const struct pubkey *pubkey,
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secp256k1_ecdsa_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(const struct bitcoin_tx *tx, size_t input_num,
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const u8 *redeemscript,
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const u8 *witness,
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const struct pubkey *key,
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const secp256k1_ecdsa_signature *sig);
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/* Give DER encoding of signature: returns length used (<= 72). */
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size_t signature_to_der(u8 der[72], const secp256k1_ecdsa_signature *s);
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/* Parse DER encoding into signature sig */
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bool signature_from_der(const u8 *der, size_t len, secp256k1_ecdsa_signature *sig);
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#endif /* LIGHTNING_BITCOIN_SIGNATURE_H */
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