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script: HTLC support.

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Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2015-08-07 12:45:30 +09:30
parent 9a0163ec85
commit 08ae4a687d
2 changed files with 128 additions and 0 deletions
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109
bitcoin/script.c
View File

@ -14,15 +14,19 @@
#define OP_PUSHDATA4 0x4E
#define OP_NOP 0x61
#define OP_IF 0x63
#define OP_NOTIF 0x64
#define OP_ELSE 0x67
#define OP_ENDIF 0x68
#define OP_2DROP 0x6d
#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
#define OP_1SUB 0x8C
#define OP_ADD 0x93
#define OP_CHECKSIG 0xAC
#define OP_CHECKMULTISIG 0xAE
#define OP_HASH160 0xA9
@ -111,6 +115,7 @@ static void add_push_sig(u8 **scriptp, const struct bitcoin_signature *sig)
#endif
}
/* FIXME: Is this really required, not a simple add_number? */
static void add_push_le32(u8 **scriptp, u32 val)
{
le32 val_le = cpu_to_le32(val);
@ -172,6 +177,110 @@ u8 *scriptpubkey_p2sh(const tal_t *ctx, const u8 *redeemscript)
return script;
}
/* Create a script for our HTLC output: sending. */
u8 *scriptpubkey_htlc_send(const tal_t *ctx,
const struct pubkey *ourkey,
const struct pubkey *theirkey,
uint64_t value,
uint32_t htlc_abstimeout,
uint32_t locktime,
const struct sha256 *commit_revoke,
const struct sha256 *rhash)
{
/* R value presented: -> them.
* Commit revocation value presented: -> them.
* HTLC times out -> us. */
u8 *script = tal_arr(ctx, u8, 0);
struct ripemd160 ripemd;
add_op(&script, OP_HASH160);
add_op(&script, OP_DUP);
/* Did they supply HTLC R value? */
ripemd160(&ripemd, rhash->u.u8, sizeof(rhash->u));
add_push_bytes(&script, &ripemd, sizeof(ripemd));
add_op(&script, OP_EQUAL);
add_op(&script, OP_SWAP);
/* How about commit revocation value? */
ripemd160(&ripemd, commit_revoke->u.u8, sizeof(commit_revoke->u));
add_push_bytes(&script, &ripemd, sizeof(ripemd));
add_op(&script, OP_EQUAL);
add_op(&script, OP_ADD);
/* If either matched... */
add_op(&script, OP_IF);
add_push_key(&script, theirkey);
add_op(&script, OP_ELSE);
/* If HTLC times out, they can collect after a delay. */
add_push_le32(&script, htlc_abstimeout);
add_op(&script, OP_CHECKLOCKTIMEVERIFY);
add_push_le32(&script, locktime);
add_op(&script, OP_CHECKSEQUENCEVERIFY);
add_op(&script, OP_2DROP);
add_push_key(&script, ourkey);
add_op(&script, OP_ENDIF);
add_op(&script, OP_CHECKSIG);
return script;
}
/* Create a script for our HTLC output: receiving. */
u8 *scriptpubkey_htlc_recv(const tal_t *ctx,
const struct pubkey *ourkey,
const struct pubkey *theirkey,
uint64_t value,
uint32_t htlc_abstimeout,
uint32_t locktime,
const struct sha256 *commit_revoke,
const struct sha256 *rhash)
{
/* R value presented: -> us.
* Commit revocation value presented: -> them.
* HTLC times out -> them. */
u8 *script = tal_arr(ctx, u8, 0);
struct ripemd160 ripemd;
add_op(&script, OP_HASH160);
add_op(&script, OP_DUP);
/* Did we supply HTLC R value? */
ripemd160(&ripemd, rhash->u.u8, sizeof(rhash->u));
add_push_bytes(&script, &ripemd, sizeof(ripemd));
add_op(&script, OP_EQUAL);
add_op(&script, OP_IF);
add_push_le32(&script, locktime);
add_op(&script, OP_CHECKSEQUENCEVERIFY);
/* Drop extra hash as well as locktime. */
add_op(&script, OP_2DROP);
add_push_key(&script, ourkey);
add_op(&script, OP_ELSE);
/* If they provided commit revocation, available immediately. */
ripemd160(&ripemd, commit_revoke->u.u8, sizeof(commit_revoke->u));
add_push_bytes(&script, &ripemd, sizeof(ripemd));
add_op(&script, OP_EQUAL);
add_op(&script, OP_NOTIF);
/* Otherwise, they must wait for HTLC timeout. */
add_push_le32(&script, htlc_abstimeout);
add_op(&script, OP_CHECKLOCKTIMEVERIFY);
add_op(&script, OP_DROP);
add_op(&script, OP_ENDIF);
add_push_key(&script, theirkey);
add_op(&script, OP_ENDIF);
add_op(&script, OP_CHECKSIG);
return script;
}
u8 *scriptsig_pay_to_pubkeyhash(const tal_t *ctx,
const struct pubkey *key,
const struct bitcoin_signature *sig)

19
bitcoin/script.h
View File

@ -38,6 +38,25 @@ u8 *scriptsig_pay_to_pubkeyhash(const tal_t *ctx,
const struct pubkey *key,
const struct bitcoin_signature *sig);
u8 *scriptpubkey_htlc_send(const tal_t *ctx,
const struct pubkey *ourkey,
const struct pubkey *theirkey,
uint64_t value,
uint32_t htlc_abstimeout,
uint32_t locktime,
const struct sha256 *commit_revoke,
const struct sha256 *rhash);
/* Create a script for our HTLC output: receiving. */
u8 *scriptpubkey_htlc_recv(const tal_t *ctx,
const struct pubkey *ourkey,
const struct pubkey *theirkey,
uint64_t value,
uint32_t htlc_abstimeout,
uint32_t locktime,
const struct sha256 *commit_revoke,
const struct sha256 *rhash);
/* Create an input script to accept pay to pubkey */
u8 *scriptsig_p2sh_2of2(const tal_t *ctx,
const struct bitcoin_signature *sig1,