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script: dual anchor input support.

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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 ee3af28980
commit 11099d738f
2 changed files with 110 additions and 0 deletions
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85
bitcoin/script.c
View File

@ -19,6 +19,7 @@
#define OP_DEPTH 0x74
#define OP_DROP 0x75
#define OP_DUP 0x76
#define OP_SWAP 0x7C
#define OP_EQUAL 0x87
#define OP_EQUALVERIFY 0x88
#define OP_SIZE 0x82
@ -274,6 +275,45 @@ u8 *bitcoin_redeem_secret_or_delay(const tal_t *ctx,
return script;
}
/* One of:
* their_commit_keysig and keysig, OR
* their_escape_keysig and keysig and escape_secret. */
u8 *bitcoin_redeem_anchor(const tal_t *ctx,
const struct pubkey *key,
const struct pubkey *their_commit_key,
const struct pubkey *their_escape_key,
const struct sha256 *escape_hash)
{
struct ripemd160 ehash_ripemd;
u8 *script = tal_arr(ctx, u8, 0);
/* If the secret is supplied... */
ripemd160(&ehash_ripemd, escape_hash->u.u8, sizeof(escape_hash->u));
add_op(&script, OP_HASH160);
add_push_bytes(&script, ehash_ripemd.u.u8, sizeof(ehash_ripemd.u.u8));
add_op(&script, OP_EQUAL);
add_op(&script, OP_IF);
/* Should be signed by B's escape key. */
add_push_key(&script, their_escape_key);
/* Otherwise, should be signed by B's commitment key. */
add_op(&script, OP_ELSE);
add_push_key(&script, their_commit_key);
add_op(&script, OP_ENDIF);
/* Put "2" (2 signatures) underneath that signature on stack. */
add_number(&script, 2);
add_op(&script, OP_SWAP);
/* Must be signed by A's key too. */
add_push_key(&script, key);
add_number(&script, 2);
add_op(&script, OP_CHECKMULTISIG);
return script;
}
u8 *scriptsig_p2sh_secret(const tal_t *ctx,
const void *secret, size_t secret_len,
const struct bitcoin_signature *sig,
@ -288,3 +328,48 @@ u8 *scriptsig_p2sh_secret(const tal_t *ctx,
return script;
}
/* Create an input script to spend anchor output (commit version). */
u8 *scriptsig_p2sh_anchor_commit(const tal_t *ctx,
const struct bitcoin_signature *their_sig,
const struct bitcoin_signature *our_sig,
const u8 *anchor_redeem,
size_t redeem_len)
{
u8 *script = tal_arr(ctx, u8, 0);
/* OP_CHECKMULTISIG has an out-by-one bug, which MBZ */
add_number(&script, 0);
/* Redeemscript wants their sig first. */
add_push_sig(&script, their_sig);
add_push_sig(&script, our_sig);
/* This is 0, as we don't have the secret. */
add_number(&script, 0);
add_push_bytes(&script, anchor_redeem, redeem_len);
return script;
}
/* Create an input script to spend anchor output (escape version) */
u8 *scriptsig_p2sh_anchor_escape(const tal_t *ctx,
const struct bitcoin_signature *their_sig,
const struct bitcoin_signature *our_sig,
const struct sha256 *escape_secret,
const u8 *anchor_redeem,
size_t redeem_len)
{
u8 *script = tal_arr(ctx, u8, 0);
/* OP_CHECKMULTISIG has an out-by-one bug, which MBZ */
add_number(&script, 0);
/* Redeemscript wants their sig first. */
add_push_sig(&script, their_sig);
add_push_sig(&script, our_sig);
add_push_bytes(&script, escape_secret, sizeof(*escape_secret));
add_push_bytes(&script, anchor_redeem, redeem_len);
return script;
}

25
bitcoin/script.h
View File

@ -7,6 +7,7 @@
struct bitcoin_address;
struct pubkey;
struct sha256;
struct ripemd160;
/* A bitcoin signature includes one byte for the type. */
struct bitcoin_signature {
@ -30,6 +31,15 @@ u8 *bitcoin_redeem_secret_or_delay(const tal_t *ctx,
const struct pubkey *key_if_secret_known,
const struct sha256 *hash_of_secret);
/* One of:
* keysig and their_commit_keysig, OR
* keysig and their_escape_keysig and escape_secret. */
u8 *bitcoin_redeem_anchor(const tal_t *ctx,
const struct pubkey *key,
const struct pubkey *their_commit_key,
const struct pubkey *their_escape_key,
const struct sha256 *escape_hash);
/* Create an output script using p2sh for this redeem script. */
u8 *scriptpubkey_p2sh(const tal_t *ctx, const u8 *redeemscript);
@ -45,6 +55,21 @@ u8 *scriptsig_p2sh_2of2(const tal_t *ctx,
const struct pubkey *key1,
const struct pubkey *key2);
/* Create an input script to spend anchor output (commit version). */
u8 *scriptsig_p2sh_anchor_commit(const tal_t *ctx,
const struct bitcoin_signature *their_sig,
const struct bitcoin_signature *our_sig,
const u8 *anchor_redeem,
size_t redeem_len);
/* Create an input script to spend anchor output (escape version) */
u8 *scriptsig_p2sh_anchor_escape(const tal_t *ctx,
const struct bitcoin_signature *their_sig,
const struct bitcoin_signature *our_sig,
const struct sha256 *escape_secret,
const u8 *anchor_redeem,
size_t redeem_len);
/* Create an input script to solve by secret */
u8 *scriptsig_p2sh_secret(const tal_t *ctx,
const void *secret, size_t secret_len,