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bitcoin/script: helper to create ScriptCode for signing P2WPKH.

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sign_tx_input() now takes a witness_script arg: P2WPKH doesn't really
have a witness_script, but for signing it behaves as if it does.

This helper constructs that "fake" witness_script.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2016-04-12 13:06:51 +09:30
parent df5d4e3c10
commit af080d5613
2 changed files with 29 additions and 0 deletions
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26
bitcoin/script.c
View file

@ -282,6 +282,32 @@ u8 *scriptsig_pay_to_pubkeyhash(const tal_t *ctx,
return script;
}
/* Create scriptcode (fake witness, basically) for P2WPKH */
u8 *p2wpkh_scriptcode(const tal_t *ctx, const struct pubkey *key)
{
struct sha256 h;
struct ripemd160 pkhash;
u8 *script = tal_arr(ctx, u8, 0);
sha256(&h, key->der, sizeof(key->der));
ripemd160(&pkhash, h.u.u8, sizeof(h));
/* BIP143:
*
* For P2WPKH witness program, the scriptCode is
* 0x1976a914{20-byte-pubkey-hash}88ac.
*/
/* PUSH(25): OP_DUP OP_HASH160 PUSH(20) 20-byte-pubkey-hash
* OP_EQUALVERIFY OP_CHECKSIG */
add_op(&script, OP_DUP);
add_op(&script, OP_HASH160);
add_push_bytes(&script, &pkhash, sizeof(pkhash));
add_op(&script, OP_EQUALVERIFY);
add_op(&script, OP_CHECKSIG);
return script;
}
/* Assumes redeemscript contains CHECKSIG, not CHECKMULTISIG */
u8 *scriptsig_p2sh_single_sig(const tal_t *ctx,
const u8 *redeem_script,

3
bitcoin/script.h
View file

@ -41,6 +41,9 @@ u8 *scriptsig_pay_to_pubkeyhash(const tal_t *ctx,
const struct pubkey *key,
const struct bitcoin_signature *sig);
/* Create scriptcode (fake witness, basically) for P2WPKH */
u8 *p2wpkh_scriptcode(const tal_t *ctx, const struct pubkey *key);
u8 *scriptpubkey_htlc_send(const tal_t *ctx,
const struct pubkey *ourkey,
const struct pubkey *theirkey,