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common: support opt_shutdown_anysegwit checks (EXPERIMENTAL_FEATURES).

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Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell
2021-02-24 13:23:12 +10:30
parent db2198e7b9
commit d0946b75bc
10 changed files with 164 additions and 6 deletions
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57
common/shutdown_scriptpubkey.c
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@@ -1,10 +1,63 @@
#include <bitcoin/script.h>
#include <common/shutdown_scriptpubkey.h>
bool valid_shutdown_scriptpubkey(const u8 *scriptpubkey)
#include <stdio.h>
/* BOLT-4e329271a358ee52bf43ddbd96776943c5d74508 #2:
* 5. if (and only if) `option_shutdown_anysegwit` is negotiated:
* * `OP_1` through `OP_16` inclusive, followed by a single
* push of 2 to 40 bytes
* (witness program versions 1 through 16)
*/
static bool is_valid_witnessprog(const u8 *scriptpubkey)
{
size_t pushlen;
if (tal_bytelen(scriptpubkey) < 2)
return false;
switch (scriptpubkey[0]) {
case OP_1:
case OP_2:
case OP_3:
case OP_4:
case OP_5:
case OP_6:
case OP_7:
case OP_8:
case OP_9:
case OP_10:
case OP_11:
case OP_12:
case OP_13:
case OP_14:
case OP_15:
case OP_16:
break;
default:
fprintf(stderr, "op = %u (invalid)\n", scriptpubkey[0]);
return false;
}
pushlen = scriptpubkey[1];
/* Must be all of the rest of scriptpubkey */
if (2 + pushlen != tal_bytelen(scriptpubkey)) {
fprintf(stderr, "2 + %zu != %zu\n", pushlen, tal_bytelen(scriptpubkey));
return false;
}
if (!(pushlen >= 2 && pushlen <= 40))
fprintf(stderr, "pushlen == %zu\n", pushlen);
return pushlen >= 2 && pushlen <= 40;
}
bool valid_shutdown_scriptpubkey(const u8 *scriptpubkey,
bool anysegwit)
{
return is_p2pkh(scriptpubkey, NULL)
|| is_p2sh(scriptpubkey, NULL)
|| is_p2wpkh(scriptpubkey, NULL)
|| is_p2wsh(scriptpubkey, NULL);
|| is_p2wsh(scriptpubkey, NULL)
|| (anysegwit && is_valid_witnessprog(scriptpubkey));
}