paypro: fix rsa+sha256 vs rsa+sha1.

lib/PayPro.js

@@ -213,7 +213,8 @@ PayPro.prototype.sign = function(key) {
     var crypto = require('crypto');
     var pki_data = this.get('pki_data'); // contains one or more x509 certs
     //var details = this.get('serialized_payment_details');
-    var signature = crypto.createSign('RSA-SHA256');
+    var type = pki_type.split('+').toUpperCase();
+    var verifier = crypto.createSign('RSA-' + type);
     var buf = this.serializeForSig();
     signature.update(buf);
     //var pki_data = require('fs').readFileSync(__dirname + '/../test/data/x509.pem');
@@ -244,7 +245,8 @@ PayPro.prototype.verify = function() {
     var pki_data = this.get('pki_data');
     // var details = this.get('serialized_payment_details');
     var buf = this.serializeForSig();
-    var verifier = crypto.createVerify('RSA-SHA256');
+    var type = pki_type.split('+').toUpperCase();
+    var verifier = crypto.createVerify('RSA-' + type);
     verifier.update(buf);
     return verifier.verify(pki_data, sig);
   } else if (pki_type === 'none') {