diff --git a/lib/PayPro.js b/lib/PayPro.js
index be76503de..4812f1483 100644
--- a/lib/PayPro.js
+++ b/lib/PayPro.js
@@ -58,41 +58,4 @@ PayPro.prototype.x509Verify = function() {
   });
 };
 
-// Helpers
-
-PayPro.prototype._PEMtoDER = function(pem) {
-  return this._PEMtoDERParam(pem);
-};
-
-PayPro.prototype._PEMtoDERParam = function(pem, param) {
-  if (Buffer.isBuffer(pem)) {
-    pem = pem.toString();
-  }
-  var start = new RegExp('(?=-----BEGIN ' + (param || '[^-]+') + '-----)', 'i');
-  var end = new RegExp('^-----END ' + (param || '[^-]+') + '-----$', 'gmi');
-  pem = pem.replace(end, '');
-  var parts = pem.split(start);
-  return parts.map(function(part) {
-    var type = /-----BEGIN ([^-]+)-----/.exec(part)[1];
-    part = part.replace(/-----BEGIN ([^-]+)-----/g, '');
-    part = part.replace(/\s+/g, '');
-    if (!param || type !== param) return;
-    return new Buffer(part, 'base64');
-  }).filter(Boolean);
-};
-
-PayPro.prototype._DERtoPEM = function(der, type) {
-  if (typeof der === 'string') {
-    der = new Buffer(der, 'hex');
-  }
-  var type = type || 'UNKNOWN';
-  der = der.toString('base64');
-  der = der.replace(/(.{64})/g, '$1\r\n');
-  der = der.replace(/\r\n$/, '');
-  return ''
-    + '-----BEGIN ' + type + '-----\r\n'
-    + der
-    + '\r\n-----END ' + type + '-----\r\n';
-};
-
 module.exports = PayPro;
diff --git a/lib/browser/PayPro.js b/lib/browser/PayPro.js
index 3d00e14d9..253d6ba68 100644
--- a/lib/browser/PayPro.js
+++ b/lib/browser/PayPro.js
@@ -6,8 +6,11 @@ var assert = require('assert');
 var PayPro = require('../common/PayPro');
 var RootCerts = require('../common/RootCerts');
 
+// Documentation:
+// http://kjur.github.io/jsrsasign/api/symbols/KJUR.crypto.Signature.html#.sign
+// http://kjur.github.io/jsrsasign/api/symbols/RSAKey.html
+
 PayPro.prototype.x509Sign = function(key) {
-  var crypto = require('crypto');
   var pki_type = this.get('pki_type');
   var pki_data = this.get('pki_data'); // contains one or more x509 certs
   var type = pki_type.split('+')[1].toUpperCase();
@@ -24,17 +27,23 @@ PayPro.prototype.x509Sign = function(key) {
     // throw new Error('Unstrusted certificate.');
   }
 
+  var rsa = new KJUR.RSAKey();
+  rsa.readPrivateKeyFromPEMString(key.toString());
+  key = rsa;
+
   var jsrsaSig = new KJUR.crypto.Signature({
-    alg: type + 'withRSA',
+    alg: type.toUpperCase() + 'withRSA',
     prov: 'cryptojs/jsrsa'
   });
 
-  jsrsaSig.initSign(key);
+  // XXX Could use this?
+  //jsrsaSig.initSign(key);
+
+  jsrsaSig.init(key);
 
   jsrsaSig.updateHex(buf.toString('hex'));
 
-  var sig = new Buffer(jsrsasig.sign(), 'hex');
-  //var sig = new Buffer(new Uint8Array(jsrsasig.sign()), 'hex');
+  var sig = new Buffer(jsrsaSig.sign(), 'hex');
   return sig;
 };
 
@@ -46,7 +55,7 @@ PayPro.prototype.x509Verify = function(key) {
   var type = pki_type.split('+')[1].toUpperCase();
 
   var jsrsaSig = new KJUR.crypto.Signature({
-    alg: type + 'withRSA',
+    alg: type.toUpperCase() + 'withRSA',
     prov: 'cryptojs/jsrsa'
   });
 
diff --git a/lib/common/PayPro.js b/lib/common/PayPro.js
index 7ac145769..58d4bbf99 100644
--- a/lib/common/PayPro.js
+++ b/lib/common/PayPro.js
@@ -256,4 +256,41 @@ PayPro.prototype.sinVerify = function() {
   return Message.verifyWithPubKey(pubkey, buf, sig);
 };
 
+// Helpers
+
+PayPro.prototype._PEMtoDER = function(pem) {
+  return this._PEMtoDERParam(pem);
+};
+
+PayPro.prototype._PEMtoDERParam = function(pem, param) {
+  if (Buffer.isBuffer(pem)) {
+    pem = pem.toString();
+  }
+  var start = new RegExp('(?=-----BEGIN ' + (param || '[^-]+') + '-----)', 'i');
+  var end = new RegExp('^-----END ' + (param || '[^-]+') + '-----$', 'gmi');
+  pem = pem.replace(end, '');
+  var parts = pem.split(start);
+  return parts.map(function(part) {
+    var type = /-----BEGIN ([^-]+)-----/.exec(part)[1];
+    part = part.replace(/-----BEGIN ([^-]+)-----/g, '');
+    part = part.replace(/\s+/g, '');
+    if (!param || type !== param) return;
+    return new Buffer(part, 'base64');
+  }).filter(Boolean);
+};
+
+PayPro.prototype._DERtoPEM = function(der, type) {
+  if (typeof der === 'string') {
+    der = new Buffer(der, 'hex');
+  }
+  var type = type || 'UNKNOWN';
+  der = der.toString('base64');
+  der = der.replace(/(.{64})/g, '$1\r\n');
+  der = der.replace(/\r\n$/, '');
+  return ''
+    + '-----BEGIN ' + type + '-----\r\n'
+    + der
+    + '\r\n-----END ' + type + '-----\r\n';
+};
+
 module.exports = PayPro;
diff --git a/test/test.PayPro.js b/test/test.PayPro.js
index 8491ff210..dd943ed57 100644
--- a/test/test.PayPro.js
+++ b/test/test.PayPro.js
@@ -5,8 +5,6 @@ var should = chai.should();
 var expect = chai.expect;
 var bitcore = bitcore || require('../bitcore');
 
-var KJUR = require('jsrsasign');
-
 var PayPro = bitcore.PayPro;
 var Key = bitcore.Key;
 
@@ -538,7 +536,11 @@ describe('PayPro', function() {
     it('convert a DER cert to PEM', function() {
       var paypro = new PayPro();
       var pem1 = paypro._DERtoPEM(x509.der, 'CERTIFICATE');
-      var pem2 = KJUR.asn1.ASN1Util.getPEMStringFromHex(x509.der.toString('hex'), 'CERTIFICATE');
+      //var KJUR = require('jsrsasign');
+      //var pem2 = KJUR.asn1.ASN1Util.getPEMStringFromHex(x509.der.toString('hex'), 'CERTIFICATE');
+      var pem2 = x509.pem.toString();
+      pem1 = pem1.replace(/\s+/g, '');
+      pem2 = pem2.replace(/\s+/g, '');
       pem1.should.equal(pem2);
     });
   });