Added to convert.js and some more multisig methods

src/convert.js

@@ -2,20 +2,20 @@
 
 var base64map = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
 
+String.prototype.lpad = function(padString, length) {
+    var str = this;
+    while (str.length < length) str = padString + str;
+    return str;
+}
+
 // Convert a byte array to a hex string
 module.exports.bytesToHex = function(bytes) {
-		for (var hex = [], i = 0; i < bytes.length; i++) {
-			hex.push((bytes[i] >>> 4).toString(16));
-			hex.push((bytes[i] & 0xF).toString(16));
-		}
-		return hex.join("");
+    return bytes.map(function(x) { return x.toString(16).lpad('0',2) }).join('');
 };
 
 // Convert a hex string to a byte array
 module.exports.hexToBytes = function(hex) {
-		for (var bytes = [], c = 0; c < hex.length; c += 2)
-			bytes.push(parseInt(hex.substr(c, 2), 16));
-		return bytes;
+    return hex.match(/../g).map(function(x) { return parseInt(x,16) });
 }
 
 	// Convert a byte array to a base-64 string
@@ -53,7 +53,26 @@ module.exports.base64ToBytes = function(base64) {
 		return bytes;
 }
 
-// utf8 and binary?
-//stringToBytes
-//bytesToString
+// Hex only (allowing bin would be potentially risky, as 01010101 = \x01 * 4 or 85)
+module.exports.coerceToBytes = function(input) {
+    if (typeof input == "string") return Crypto.util.hexToBytes(input);
+    return input;
+}
+
+module.exports.binToBytes = function(bin) {
+    return bin.match(/......../g).map(function(x) { return parseInt(x,2) });
+}
+
+module.exports.bytesToBin = function(bytes) {
+    return bytes.map(function(x) { return x.toString(2).lpad('0',8) }).join('');
+}
+
+module.exports.bytesToString = function(bytes) {
+    return bytes.map(String.fromCharCode).join('');
+}
+
+module.exports.stringToBytes = function(string) {
+    return string.split('').map(function(x) { return x.charCodeAt(0) });
+}
 
+// utf8

src/script.js

@@ -155,6 +155,8 @@ Script.prototype.simpleOutHash = function ()
     return this.chunks[2];
   case 'Pubkey':
     return Bitcoin.Util.sha256ripe160(this.chunks[0]);
+  case 'Multisig':
+    return Bitcoin.Util.sha256ripe160(this.buffer);
   default:
     throw new Error("Encountered non-standard scriptPubKey: " + this.getOutType());
   }
@@ -185,6 +187,9 @@ Script.prototype.simpleOutPubKeyHash = Script.prototype.simpleOutHash;
  * Pubkey:
  *   Paying to a public key directly.
  *   [sig]
+ *
+ * Multisig:
+ *   Paying to M-of-N public keys.
  * 
  * Strange:
  *   Any other script (no template matched).
@@ -200,6 +205,12 @@ Script.prototype.getInType = function ()
              util.isArray(this.chunks[0]) &&
              util.isArray(this.chunks[1])) {
     return 'Address';
+  } else if (this.chunks[0] == Opcode.map.OP_0 && 
+             this.chunks.slice(1).reduce(function(t,chunk,i) {
+                return t && util.isArray(chunk) 
+                         && (chunk[0] == 48 || i == this.chunks.length - 1);
+             },true)) {
+    return 'Multisig';
   } else {
     return 'Strange';
   }
@@ -336,6 +347,8 @@ Script.prototype.extractAddresses = function (addresses)
 Script.createMultiSigOutputScript = function (m, pubkeys)
 {
   var script = new Script();
+
+  pubkeys = pubkeys.sort();
   
   script.writeOp(Opcode.map.OP_1 + m - 1);
   
@@ -361,6 +374,21 @@ Script.createInputScript = function (signature, pubKey)
   return script;
 };
 
+/**
+ * Create a multisig input
+ */
+Script.createMultiSigInputScript = function(signatures, script)
+{
+    script = new Script(script);
+    var k = script.chunks[0][0];
+    if (signatures.length < k) return false; //Not enough sigs
+    var inScript = new Script();
+    inScript.writeOp(Opcode.map.OP_0);
+    signatures.map(inScript.writeBytes.bind(inScript));
+    inScript.writeBytes(script.buffer);
+    return inScript;
+}
+
 Script.prototype.clone = function ()
 {
   return new Script(this.buffer);

src/transaction.js

@@ -496,16 +496,12 @@ Transaction.prototype.p2shsign = function(index, script, key, type) {
 
 Transaction.prototype.multisign = Transaction.prototype.p2shsign;
 
-// In progress
-/*Transaction.prototype.validateInput = function(index,script,sig,pub) {
+Transaction.prototype.validateSig = function(index,script,sig,pub) {
     script = new Bitcoin.Script(script);
-    
-        scriptBytes = bw.h2b(script),
-        scriptObj = new Bitcoin.Script(scriptBytes),
-        hash = txObj.hashTransactionForSignature(scriptObj,i,1);
-    return Bitcoin.ECDSA.verify(hash, bw.h2b(sig),
-                                      bw.h2b(pub));
-}*/
+    var hash = this.hashTransactionForSignature(script,i,1);
+    return Bitcoin.ECDSA.verify(hash, conv.coerceToBytes(sig),
+                                      conv.coerceToBytes(pub));
+}
 
 
 var TransactionIn = function (data)