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script: add standard routines for secret-or-timedelay outputs.

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Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2015-07-24 16:00:10 +09:30
parent bde07aa6a7
commit d053181b0b
3 changed files with 59 additions and 11 deletions
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49
bitcoin/script.c
View File

@ -236,7 +236,44 @@ bool is_p2sh(const u8 *script, size_t script_len)
return false;
return true;
}
/* A common script pattern: A can have it with secret, or B can have
* it after delay. */
u8 *bitcoin_redeem_secret_or_delay(const tal_t *ctx,
const struct pubkey *delayed_key,
u32 locktime,
const struct pubkey *key_if_secret_known,
const struct sha256 *hash_of_secret)
{
struct ripemd160 ripemd;
le32 locktime_le = cpu_to_le32(locktime);
u8 *script = tal_arr(ctx, u8, 0);
ripemd160(&ripemd, hash_of_secret->u.u8, sizeof(hash_of_secret->u));
/* If the secret is supplied.... */
add_op(&script, OP_HASH160);
add_push_bytes(&script, ripemd.u.u8, sizeof(ripemd.u.u8));
add_op(&script, OP_EQUAL);
add_op(&script, OP_IF);
/* They can collect the funds. */
add_push_key(&script, key_if_secret_known);
add_op(&script, OP_ELSE);
/* Other can collect after a delay. */
add_push_bytes(&script, &locktime_le, sizeof(locktime_le));
add_op(&script, OP_CHECKSEQUENCEVERIFY);
add_op(&script, OP_DROP);
add_push_key(&script, delayed_key);
add_op(&script, OP_ENDIF);
add_op(&script, OP_CHECKSIG);
return script;
}
/* One of:
* mysig and relative locktime passed, OR
* theirsig and hash preimage. */
@ -277,17 +314,17 @@ u8 *bitcoin_redeem_revocable(const tal_t *ctx,
return script;
}
u8 *scriptsig_p2sh_revoke(const tal_t *ctx,
const struct sha256 *preimage,
u8 *scriptsig_p2sh_secret(const tal_t *ctx,
const void *secret, size_t secret_len,
const struct bitcoin_signature *sig,
const u8 *revocable_redeem,
const u8 *redeemscript,
size_t redeem_len)
{
u8 *script = tal_arr(ctx, u8, 0);
add_push_sig(&script, sig);
add_push_bytes(&script, preimage, sizeof(*preimage));
add_push_bytes(&script, revocable_redeem, redeem_len);
add_push_bytes(&script, secret, secret_len);
add_push_bytes(&script, redeemscript, redeem_len);
return script;
}

16
bitcoin/script.h
View File

@ -32,6 +32,14 @@ u8 *bitcoin_redeem_revocable(const tal_t *ctx,
const struct pubkey *theirkey,
const struct sha256 *revocation_hash);
/* A common script pattern: A can have it with secret, or B can have
* it after delay. */
u8 *bitcoin_redeem_secret_or_delay(const tal_t *ctx,
const struct pubkey *delayed_key,
u32 locktime,
const struct pubkey *key_if_secret_known,
const struct sha256 *hash_of_secret);
/* Create an output script using p2sh for this redeem script. */
u8 *scriptpubkey_p2sh(const tal_t *ctx, const u8 *redeemscript);
@ -47,11 +55,11 @@ u8 *scriptsig_p2sh_2of2(const tal_t *ctx,
const struct pubkey *key1,
const struct pubkey *key2);
/* Create an input script to solve by revokehash */
u8 *scriptsig_p2sh_revoke(const tal_t *ctx,
const struct sha256 *preimage,
/* Create an input script to solve by secret */
u8 *scriptsig_p2sh_secret(const tal_t *ctx,
const void *secret, size_t secret_len,
const struct bitcoin_signature *sig,
const u8 *revocable_redeem,
const u8 *redeemscript,
size_t redeem_len);
/* Create an input script which pushes sigs then redeem script. */

5
test-cli/create-steal-tx.c
View File

@ -115,7 +115,10 @@ int main(int argc, char *argv[])
&privkey, &pubkey1, &sig.sig))
errx(1, "Could not sign tx");
sig.stype = SIGHASH_ALL;
tx->input[0].script = scriptsig_p2sh_revoke(tx, &revoke_preimage, &sig,
tx->input[0].script = scriptsig_p2sh_secret(tx,
&revoke_preimage,
sizeof(revoke_preimage),
&sig,
redeemscript,
tal_count(redeemscript));
tx->input[0].script_length = tal_count(tx->input[0].script);