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script: expose script_push_bytes().

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We'll need it for creating redeemscripts for PSBTs.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2020-08-07 10:51:33 +09:30
parent 5e0b03fba9
commit 09f065fc45
2 changed files with 26 additions and 23 deletions
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46
bitcoin/script.c
View file

@ -59,7 +59,7 @@ static void add_op(u8 **scriptp, u8 op)
add(scriptp, &op, 1);
}
static void add_push_bytes(u8 **scriptp, const void *mem, size_t len)
void script_push_bytes(u8 **scriptp, const void *mem, size_t len)
{
if (len < 76)
add_op(scriptp, OP_PUSHBYTES(len));
@ -91,15 +91,15 @@ static void add_number(u8 **script, u32 num)
/* Beware: encoding is signed! */
if (num <= 0x0000007F)
add_push_bytes(script, &n, 1);
script_push_bytes(script, &n, 1);
else if (num <= 0x00007FFF)
add_push_bytes(script, &n, 2);
script_push_bytes(script, &n, 2);
else if (num <= 0x007FFFFF)
add_push_bytes(script, &n, 3);
script_push_bytes(script, &n, 3);
else if (num <= 0x7FFFFFFF)
add_push_bytes(script, &n, 4);
script_push_bytes(script, &n, 4);
else
add_push_bytes(script, &n, 5);
script_push_bytes(script, &n, 5);
}
}
@ -108,7 +108,7 @@ static void add_push_key(u8 **scriptp, const struct pubkey *key)
u8 der[PUBKEY_CMPR_LEN];
pubkey_to_der(der, key);
add_push_bytes(scriptp, der, sizeof(der));
script_push_bytes(scriptp, der, sizeof(der));
}
static void add_push_sig(u8 **scriptp, const struct bitcoin_signature *sig)
@ -116,7 +116,7 @@ static void add_push_sig(u8 **scriptp, const struct bitcoin_signature *sig)
u8 der[73];
size_t len = signature_to_der(der, sig);
add_push_bytes(scriptp, der, len);
script_push_bytes(scriptp, der, len);
}
static u8 *stack_key(const tal_t *ctx, const struct pubkey *key)
@ -183,7 +183,7 @@ u8 *scriptpubkey_p2sh_hash(const tal_t *ctx, const struct ripemd160 *redeemhash)
u8 *script = tal_arr(ctx, u8, 0);
add_op(&script, OP_HASH160);
add_push_bytes(&script, redeemhash->u.u8, sizeof(redeemhash->u.u8));
script_push_bytes(&script, redeemhash->u.u8, sizeof(redeemhash->u.u8));
add_op(&script, OP_EQUAL);
assert(tal_count(script) == BITCOIN_SCRIPTPUBKEY_P2SH_LEN);
return script;
@ -205,7 +205,7 @@ u8 *scriptpubkey_p2pkh(const tal_t *ctx, const struct bitcoin_address *addr)
add_op(&script, OP_DUP);
add_op(&script, OP_HASH160);
add_push_bytes(&script, &addr->addr, sizeof(addr->addr));
script_push_bytes(&script, &addr->addr, sizeof(addr->addr));
add_op(&script, OP_EQUALVERIFY);
add_op(&script, OP_CHECKSIG);
assert(tal_count(script) == BITCOIN_SCRIPTPUBKEY_P2PKH_LEN);
@ -242,7 +242,7 @@ u8 *bitcoin_redeem_p2sh_p2wpkh(const tal_t *ctx, const struct pubkey *key)
* push of a version byte plus a push of a witness program. */
add_number(&script, 0);
pubkey_to_hash160(key, &keyhash);
add_push_bytes(&script, &keyhash, sizeof(keyhash));
script_push_bytes(&script, &keyhash, sizeof(keyhash));
assert(tal_count(script) == BITCOIN_SCRIPTPUBKEY_P2WPKH_LEN);
return script;
@ -255,7 +255,7 @@ u8 *bitcoin_scriptsig_p2sh_p2wpkh(const tal_t *ctx, const struct pubkey *key)
/* BIP141: The scriptSig must be exactly a push of the BIP16
* redeemScript or validation fails. */
script = tal_arr(ctx, u8, 0);
add_push_bytes(&script, redeemscript, tal_count(redeemscript));
script_push_bytes(&script, redeemscript, tal_count(redeemscript));
tal_free(redeemscript);
return script;
}
@ -283,7 +283,7 @@ u8 *scriptpubkey_p2wsh(const tal_t *ctx, const u8 *witnessscript)
add_op(&script, OP_0);
sha256(&h, witnessscript, tal_count(witnessscript));
add_push_bytes(&script, h.u.u8, sizeof(h.u.u8));
script_push_bytes(&script, h.u.u8, sizeof(h.u.u8));
assert(tal_count(script) == BITCOIN_SCRIPTPUBKEY_P2WSH_LEN);
return script;
}
@ -296,7 +296,7 @@ u8 *scriptpubkey_p2wpkh(const tal_t *ctx, const struct pubkey *key)
add_op(&script, OP_0);
pubkey_to_hash160(key, &h);
add_push_bytes(&script, &h, sizeof(h));
script_push_bytes(&script, &h, sizeof(h));
return script;
}
@ -307,7 +307,7 @@ u8 *scriptpubkey_p2wpkh_derkey(const tal_t *ctx, const u8 der[33])
add_op(&script, OP_0);
hash160(&h, der, PUBKEY_CMPR_LEN);
add_push_bytes(&script, &h, sizeof(h));
script_push_bytes(&script, &h, sizeof(h));
return script;
}
@ -316,7 +316,7 @@ u8 *scriptpubkey_witness_raw(const tal_t *ctx, u8 version,
{
u8 *script = tal_arr(ctx, u8, 0);
add_number(&script, version);
add_push_bytes(&script, wprog, wprog_size);
script_push_bytes(&script, wprog, wprog_size);
return script;
}
@ -362,7 +362,7 @@ u8 *p2wpkh_scriptcode(const tal_t *ctx, const struct pubkey *key)
* OP_EQUALVERIFY OP_CHECKSIG */
add_op(&script, OP_DUP);
add_op(&script, OP_HASH160);
add_push_bytes(&script, &pkhash, sizeof(pkhash));
script_push_bytes(&script, &pkhash, sizeof(pkhash));
add_op(&script, OP_EQUALVERIFY);
add_op(&script, OP_CHECKSIG);
@ -528,7 +528,7 @@ u8 *bitcoin_wscript_htlc_offer_ripemd160(const tal_t *ctx,
add_op(&script, OP_DUP);
add_op(&script, OP_HASH160);
pubkey_to_hash160(revocationkey, &ripemd);
add_push_bytes(&script, &ripemd, sizeof(ripemd));
script_push_bytes(&script, &ripemd, sizeof(ripemd));
add_op(&script, OP_EQUAL);
add_op(&script, OP_IF);
add_op(&script, OP_CHECKSIG);
@ -547,8 +547,8 @@ u8 *bitcoin_wscript_htlc_offer_ripemd160(const tal_t *ctx,
add_op(&script, OP_CHECKMULTISIG);
add_op(&script, OP_ELSE);
add_op(&script, OP_HASH160);
add_push_bytes(&script,
payment_ripemd->u.u8, sizeof(payment_ripemd->u.u8));
script_push_bytes(&script,
payment_ripemd->u.u8, sizeof(payment_ripemd->u.u8));
add_op(&script, OP_EQUALVERIFY);
add_op(&script, OP_CHECKSIG);
add_op(&script, OP_ENDIF);
@ -610,7 +610,7 @@ u8 *bitcoin_wscript_htlc_receive_ripemd(const tal_t *ctx,
add_op(&script, OP_DUP);
add_op(&script, OP_HASH160);
pubkey_to_hash160(revocationkey, &ripemd);
add_push_bytes(&script, &ripemd, sizeof(ripemd));
script_push_bytes(&script, &ripemd, sizeof(ripemd));
add_op(&script, OP_EQUAL);
add_op(&script, OP_IF);
add_op(&script, OP_CHECKSIG);
@ -622,8 +622,8 @@ u8 *bitcoin_wscript_htlc_receive_ripemd(const tal_t *ctx,
add_op(&script, OP_EQUAL);
add_op(&script, OP_IF);
add_op(&script, OP_HASH160);
add_push_bytes(&script,
payment_ripemd->u.u8, sizeof(payment_ripemd->u.u8));
script_push_bytes(&script,
payment_ripemd->u.u8, sizeof(payment_ripemd->u.u8));
add_op(&script, OP_EQUALVERIFY);
add_number(&script, 2);
add_op(&script, OP_SWAP);

3
bitcoin/script.h
View file

@ -140,6 +140,9 @@ bool is_known_scripttype(const u8 *script);
/* Are these two scripts equal? */
bool scripteq(const u8 *s1, const u8 *s2);
/* Raw "push these bytes" accessor. */
void script_push_bytes(u8 **scriptp, const void *mem, size_t len);
/* OP_DUP + OP_HASH160 + PUSH(20-byte-hash) + OP_EQUALVERIFY + OP_CHECKSIG */
#define BITCOIN_SCRIPTPUBKEY_P2PKH_LEN (1 + 1 + 1 + 20 + 1 + 1)