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script: encode numbers minimally.

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This happens for CSV, for example (3-byte encoding), and bitcoind treats
too-long encodings as non-standard.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell
2016-01-22 06:38:08 +10:30
parent 0ef2b9a32e
commit 4e23f9916d
1 changed files with 15 additions and 17 deletions
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32
bitcoin/script.c
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@@ -85,10 +85,16 @@ static void add_number(u8 **script, u32 num)
else if (num <= 16)
add_op(script, 0x50 + num);
else {
u8 n = num;
/* We could handle others, but currently unnecessary. */
assert(num < 256);
add_push_bytes(script, &n, sizeof(n));
le32 n = cpu_to_le32(num);
if (num <= 0x000000FF)
add_push_bytes(script, &n, 1);
else if (num <= 0x0000FFFF)
add_push_bytes(script, &n, 2);
else if (num <= 0x00FFFFFF)
add_push_bytes(script, &n, 3);
else
add_push_bytes(script, &n, 4);
}
}
@@ -115,14 +121,6 @@ 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);
add_push_bytes(scriptp, &val_le, sizeof(val_le));
}
/* FIXME: permute? */
/* Is a < b? (If equal we don't care) */
static bool key_less(const struct pubkey *a, const struct pubkey *b)
@@ -212,9 +210,9 @@ u8 *scriptpubkey_htlc_send(const tal_t *ctx,
add_op(&script, OP_ELSE);
/* If HTLC times out, they can collect after a delay. */
add_push_le32(&script, htlc_abstimeout);
add_number(&script, htlc_abstimeout);
add_op(&script, OP_CHECKLOCKTIMEVERIFY);
add_push_le32(&script, locktime);
add_number(&script, locktime);
add_op(&script, OP_CHECKSEQUENCEVERIFY);
add_op(&script, OP_2DROP);
add_push_key(&script, ourkey);
@@ -249,7 +247,7 @@ u8 *scriptpubkey_htlc_recv(const tal_t *ctx,
add_op(&script, OP_EQUAL);
add_op(&script, OP_IF);
add_push_le32(&script, locktime);
add_number(&script, locktime);
add_op(&script, OP_CHECKSEQUENCEVERIFY);
/* Drop extra hash as well as locktime. */
add_op(&script, OP_2DROP);
@@ -266,7 +264,7 @@ u8 *scriptpubkey_htlc_recv(const tal_t *ctx,
add_op(&script, OP_NOTIF);
/* Otherwise, they must wait for HTLC timeout. */
add_push_le32(&script, htlc_abstimeout);
add_number(&script, htlc_abstimeout);
add_op(&script, OP_CHECKLOCKTIMEVERIFY);
add_op(&script, OP_DROP);
add_op(&script, OP_ENDIF);
@@ -384,7 +382,7 @@ u8 *bitcoin_redeem_secret_or_delay(const tal_t *ctx,
add_op(&script, OP_ELSE);
/* Other can collect after a delay. */
add_push_le32(&script, locktime);
add_number(&script, locktime);
add_op(&script, OP_CHECKSEQUENCEVERIFY);
add_op(&script, OP_DROP);
add_push_key(&script, delayed_key);