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bitcoin/scrpt: add vanilla p2pkh support.

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We are about to use it for our funding tx change output.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell
2017-02-07 12:14:21 +10:30
parent 75c6dd1981
commit 1bb66cde2a
2 changed files with 47 additions and 0 deletions
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40
bitcoin/script.c
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@@ -1,3 +1,4 @@
#include "address.h"
#include "locktime.h"
#include "pubkey.h"
#include "script.h"
@@ -109,6 +110,16 @@ static void add_push_key(u8 **scriptp, const struct pubkey *key)
add_push_bytes(scriptp, der, sizeof(der));
}
static void add_push_sig(u8 **scriptp, const secp256k1_ecdsa_signature *sig)
{
u8 der[73];
size_t len = signature_to_der(der, sig);
/* Append sighash type */
der[len++] = SIGHASH_ALL;
add_push_bytes(scriptp, der, len);
}
static u8 *stack_key(const tal_t *ctx, const struct pubkey *key)
{
u8 der[PUBKEY_DER_LEN];
@@ -197,6 +208,35 @@ u8 *scriptpubkey_p2sh(const tal_t *ctx, const u8 *redeemscript)
return script;
}
/* Create an output script using p2pkh */
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));
add_op(&script, OP_DUP);
add_op(&script, OP_HASH160);
add_push_bytes(&script, &addr.addr, sizeof(addr.addr));
add_op(&script, OP_EQUALVERIFY);
add_op(&script, OP_CHECKSIG);
return script;
}
/* Create an input script which spends p2pkh */
u8 *bitcoin_redeem_p2pkh(const tal_t *ctx, const struct pubkey *pubkey,
const secp256k1_ecdsa_signature *sig)
{
u8 *script = tal_arr(ctx, u8, 0);
add_push_sig(&script, sig);
add_push_key(&script, pubkey);
return script;
}
/* Create the redeemscript for a P2SH + P2WPKH (for signing tx) */
u8 *bitcoin_redeem_p2wpkh(const tal_t *ctx, const struct pubkey *key)
{