txb: add fixes for P2SH(P2WSH(...)) and P2WSH(...) in BIP143 compliance

Author: dcousens

src/transaction_builder.js

@@ -708,8 +708,12 @@ TransactionBuilder.prototype.sign = function (vin, keyPair, redeemScript, hashTy
   var signed = input.pubKeys.some(function (pubKey, i) {
     if (!kpPubKey.equals(pubKey)) return false
     if (input.signatures[i]) throw new Error('Signature already exists')
-    if (kpPubKey.length !== 33 &&
-      input.signType === scriptTypes.P2WPKH) throw new Error('BIP143 rejects uncompressed public keys in P2WPKH or P2WSH')
+
+    if (kpPubKey.length !== 33 && (
+      input.signType === scriptTypes.P2WPKH ||
+      input.redeemScriptType === scriptTypes.P2WSH ||
+      input.prevOutType === scriptTypes.P2WSH
+    )) throw new Error('BIP143 rejects uncompressed public keys in P2WPKH or P2WSH')
 
     var signature = keyPair.sign(signatureHash)
     if (Buffer.isBuffer(signature)) signature = ECSignature.fromRSBuffer(signature)