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bitcoin/script: add internal hash160_key helper.

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Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2017-03-07 16:12:18 +10:30
parent 9035d281c6
commit de39752d05
1 changed files with 11 additions and 14 deletions
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25
bitcoin/script.c
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@ -47,6 +47,13 @@ static void hash160(struct ripemd160 *redeemhash, const void *mem, size_t len)
ripemd160(redeemhash, h.u.u8, sizeof(h));
}
static void hash160_key(struct ripemd160 *khash, const struct pubkey *key)
{
u8 der[PUBKEY_DER_LEN];
pubkey_to_der(der, key);
hash160(khash, der, sizeof(der));
}
static void add(u8 **scriptp, const void *mem, size_t len)
{
size_t oldlen = tal_count(*scriptp);
@ -218,11 +225,9 @@ u8 *scriptpubkey_p2sh(const tal_t *ctx, const u8 *redeemscript)
u8 *scriptpubkey_p2pkh(const tal_t *ctx, const struct pubkey *pubkey)
{
struct bitcoin_address addr;
u8 der[PUBKEY_DER_LEN];
u8 *script = tal_arr(ctx, u8, 0);
pubkey_to_der(der, pubkey);
hash160(&addr.addr, der, sizeof(der));
hash160_key(&addr.addr, pubkey);
add_op(&script, OP_DUP);
add_op(&script, OP_HASH160);
add_push_bytes(&script, &addr.addr, sizeof(addr.addr));
@ -247,14 +252,12 @@ u8 *bitcoin_redeem_p2pkh(const tal_t *ctx, const struct pubkey *pubkey,
u8 *bitcoin_redeem_p2sh_p2wpkh(const tal_t *ctx, const struct pubkey *key)
{
struct ripemd160 keyhash;
u8 der[PUBKEY_DER_LEN];
u8 *script = tal_arr(ctx, u8, 0);
/* BIP141: BIP16 redeemScript pushed in the scriptSig is exactly a
* push of a version byte plus a push of a witness program. */
add_number(&script, 0);
pubkey_to_der(der, key);
hash160(&keyhash, der, sizeof(der));
hash160_key(&keyhash, key);
add_push_bytes(&script, &keyhash, sizeof(keyhash));
return script;
}
@ -319,12 +322,10 @@ u8 *scriptpubkey_p2wsh(const tal_t *ctx, const u8 *witnessscript)
u8 *scriptpubkey_p2wpkh(const tal_t *ctx, const struct pubkey *key)
{
struct ripemd160 h;
u8 der[PUBKEY_DER_LEN];
u8 *script = tal_arr(ctx, u8, 0);
add_op(&script, OP_0);
pubkey_to_der(der, key);
hash160(&h, der, sizeof(der));
hash160_key(&h, key);
add_push_bytes(&script, &h, sizeof(h));
return script;
}
@ -479,14 +480,10 @@ u8 *bitcoin_redeem_htlc_recv(const tal_t *ctx,
/* 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 der[PUBKEY_DER_LEN];
u8 *script = tal_arr(ctx, u8, 0);
pubkey_to_der(der, key);
sha256(&h, der, sizeof(der));
ripemd160(&pkhash, h.u.u8, sizeof(h));
hash160_key(&pkhash, key);
/* BIP143:
*
* For P2WPKH witness program, the scriptCode is