From 0ff5bd569887f5ecfc7a8b184a3fa89e91b61ebc Mon Sep 17 00:00:00 2001
From: Daniel Cousens <github@dcousens.com>
Date: Sat, 22 Aug 2015 12:31:00 +1000
Subject: [PATCH] script: add isDefinedHashType to check hashType
---
src/script.js | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/src/script.js b/src/script.js
index 783c5da..f4f096c 100644
--- a/src/script.js
+++ b/src/script.js
@@ -134,10 +134,18 @@ function isCanonicalPubKey (buffer) {
function isCanonicalSignature (buffer) {
if (!Buffer.isBuffer(buffer)) return false
+ if (!isDefinedHashType(buffer[buffer.length - 1])) return false
return bip66.check(buffer.slice(0, -1))
}
+function isDefinedHashType (hashType) {
+ var hashTypeMod = hashType & ~0x80
+
+// return hashTypeMod > SIGHASH_ALL && hashTypeMod < SIGHASH_SINGLE
+ return hashTypeMod > 0x00 && hashTypeMod < 0x04
+}
+
function isPubKeyHashInput (script) {
var chunks = decompile(script)
@@ -369,6 +377,7 @@ module.exports = {
isCanonicalPubKey: isCanonicalPubKey,
isCanonicalSignature: isCanonicalSignature,
+ isDefinedHashType: isDefinedHashType,
isPubKeyHashInput: isPubKeyHashInput,
isPubKeyHashOutput: isPubKeyHashOutput,
isPubKeyInput: isPubKeyInput,