diff --git a/lib/browser/PayPro.js b/lib/browser/PayPro.js
index 6bf0b0fb3..b00f463b8 100644
--- a/lib/browser/PayPro.js
+++ b/lib/browser/PayPro.js
@@ -2,9 +2,32 @@
 
 var Key = require('./Key');
 var x509 = require('./x509');
+var RSAKey = x509.RSAKey;
 var assert = require('assert');
 var PayPro = require('../PayPro');
 
+/*
+rsasign-1.2.js:RSAKey.prototype.verifyPSS = _rsasign_verifyStringPSS;
+rsasign-1.2.js:RSAKey.prototype.signWithMessageHash = _rsasign_signWithMessageHash;
+rsasign-1.2.js:RSAKey.prototype.signString = _rsasign_signString;
+rsasign-1.2.js:RSAKey.prototype.signStringWithSHA1 = _rsasign_signStringWithSHA1;
+rsasign-1.2.js:RSAKey.prototype.signStringWithSHA256 = _rsasign_signStringWithSHA256;
+rsasign-1.2.js:RSAKey.prototype.sign = _rsasign_signString;
+rsasign-1.2.js:RSAKey.prototype.signWithSHA1 = _rsasign_signStringWithSHA1;
+rsasign-1.2.js:RSAKey.prototype.signWithSHA256 = _rsasign_signStringWithSHA256;
+rsasign-1.2.js:RSAKey.prototype.signWithMessageHashPSS = _rsasign_signWithMessageHashPSS;
+rsasign-1.2.js:RSAKey.prototype.signStringPSS = _rsasign_signStringPSS;
+rsasign-1.2.js:RSAKey.prototype.signPSS = _rsasign_signStringPSS;
+rsasign-1.2.js:RSAKey.prototype.verifyWithMessageHash = _rsasign_verifyWithMessageHash;
+rsasign-1.2.js:RSAKey.prototype.verifyString = _rsasign_verifyString;
+rsasign-1.2.js:RSAKey.prototype.verifyHexSignatureForMessage = _rsasign_verifyHexSignatureForMessage;
+rsasign-1.2.js:RSAKey.prototype.verify = _rsasign_verifyString;
+rsasign-1.2.js:RSAKey.prototype.verifyHexSignatureForByteArrayMessage = _rsasign_verifyHexSignatureForMessage;
+rsasign-1.2.js:RSAKey.prototype.verifyWithMessageHashPSS = _rsasign_verifyWithMessageHashPSS;
+rsasign-1.2.js:RSAKey.prototype.verifyStringPSS = _rsasign_verifyStringPSS;
+rsasign-1.2.js:RSAKey.prototype.verifyPSS = _rsasign_verifyStringPSS;
+*/
+
 PayPro.sign = function(key) {
   if (this.messageType !== 'PaymentRequest')
     throw new Error('Signing can only be performed on a PaymentRequest');
@@ -21,10 +44,10 @@ PayPro.sign = function(key) {
     var type = pki_type.split('+').toUpperCase();
     var buf = this.serializeForSig();
     var hexSig = _rsasign_getHexPaddedDigestInfoForString(buf.toString(16), 2048, type);
+    var hexSig = RSAKey.signWith(buf.toString(16), 2048, type);
     var size = hexSig.length / 2;
     if (size % 2) size++
-    var bbuf = new Uint8Array(size);
-    var sig = new Buffer(bbuf);
+    var sig = new Buffer(hexSign, 'hex');
   } else if (pki_type === 'none') {
     return this;
   } else {