diff --git a/lib/PayPro.js b/lib/PayPro.js
index eb0cd7a..ff1027a 100644
--- a/lib/PayPro.js
+++ b/lib/PayPro.js
@@ -1,5 +1,7 @@
 'use strict';
 
+var crypto = require('crypto');
+
 var Message = Message || require('./Message');
 
 var RootCerts = require('./common/RootCerts');
@@ -11,18 +13,24 @@ var rfc3280 = require('asn1.js/rfc/3280');
 
 PayPro.prototype.x509Sign = function(key, returnTrust) {
   var self = this;
-  var crypto = require('crypto');
   var pki_type = this.get('pki_type');
   var pki_data = this.get('pki_data');
   pki_data = PayPro.X509Certificates.decode(pki_data);
   pki_data = pki_data.certificate;
   var details = this.get('serialized_payment_details');
-  var type = pki_type.split('+')[1].toUpperCase();
+  var type = pki_type !== 'none'
+    ? pki_type.split('+')[1].toUpperCase()
+    : pki_type;
 
-  var signature = crypto.createSign('RSA-' + type);
-  var buf = this.serializeForSig();
-  signature.update(buf);
-  var sig = signature.sign(key);
+  if (type !== 'none') {
+    var signature = crypto.createSign('RSA-' + type);
+    var buf = this.serializeForSig();
+    signature.update(buf);
+    var sig = signature.sign(key);
+  } else {
+    var buf = this.serializeForSig();
+    var sig = '';
+  }
 
   if (returnTrust) {
     var cert = pki_data[pki_data.length - 1];
@@ -49,7 +57,6 @@ PayPro.prototype.x509Sign = function(key, returnTrust) {
 
 PayPro.prototype.x509Verify = function(returnTrust) {
   var self = this;
-  var crypto = require('crypto');
   var pki_type = this.get('pki_type');
   var sig = this.get('signature');
   var pki_data = this.get('pki_data');
@@ -57,15 +64,20 @@ PayPro.prototype.x509Verify = function(returnTrust) {
   pki_data = pki_data.certificate;
   var details = this.get('serialized_payment_details');
   var buf = this.serializeForSig();
-  var type = pki_type.split('+')[1].toUpperCase();
+  var type = pki_type !== 'none'
+    ? pki_type.split('+')[1].toUpperCase()
+    : pki_type;
 
-  var verifier = crypto.createVerify('RSA-' + type);
-  verifier.update(buf);
-
-  var signedCert = pki_data[0];
-  var der = signedCert.toString('hex');
-  var pem = PayPro.DERtoPEM(der, 'CERTIFICATE');
-  var verified = verifier.verify(pem, sig);
+  if (type !== 'none') {
+    var verifier = crypto.createVerify('RSA-' + type);
+    verifier.update(buf);
+    var signedCert = pki_data[0];
+    var der = signedCert.toString('hex');
+    var pem = PayPro.DERtoPEM(der, 'CERTIFICATE');
+    var verified = verifier.verify(pem, sig);
+  } else {
+    var verified = true;
+  }
 
   var chain = pki_data;
 
@@ -107,7 +119,27 @@ PayPro.prototype.x509Verify = function(returnTrust) {
     return verified;
   }
 
-  var chainVerified = chain.every(function(cert, i) {
+  var chainVerified = PayPro.verifyCertChain(chain, type);
+
+  if (returnTrust) {
+    return {
+      selfSigned: 0, // no
+      isChain: true,
+      verified: verified,
+      caTrusted: !!caName,
+      caName: caName || null,
+      chainVerified: chainVerified
+    };
+  }
+
+  return verified && chainVerified;
+};
+
+PayPro.verifyCertChain = function(chain, sigHashAlg) {
+  if (sigHashAlg === 'none') {
+    return true;
+  }
+  return chain.every(function(cert, i) {
     var der = cert.toString('hex');
     var pem = PayPro.DERtoPEM(der, 'CERTIFICATE');
     var name = RootCerts.getTrusted(pem);
@@ -160,7 +192,7 @@ PayPro.prototype.x509Verify = function(returnTrust) {
     // from the DER Certificate:
     var tbs = PayPro.getTBSCertificate(data);
 
-    var verifier = crypto.createVerify('RSA-' + sigAlg);
+    var verifier = crypto.createVerify('RSA-' + sigHashAlg);
     verifier.update(tbs);
     var sigVerified = verifier.verify(npubKey, sig);
 
@@ -168,19 +200,6 @@ PayPro.prototype.x509Verify = function(returnTrust) {
       && issuerVerified
       && sigVerified;
   });
-
-  if (returnTrust) {
-    return {
-      selfSigned: 0, // no
-      isChain: true,
-      verified: verified,
-      caTrusted: !!caName,
-      caName: caName || null,
-      chainVerified: chainVerified
-    };
-  }
-
-  return verified && chainVerified;
 };
 
 module.exports = PayPro;
diff --git a/lib/browser/PayPro.js b/lib/browser/PayPro.js
index 3058284..011950d 100644
--- a/lib/browser/PayPro.js
+++ b/lib/browser/PayPro.js
@@ -18,23 +18,29 @@ PayPro.prototype.x509Sign = function(key, returnTrust) {
   var pki_data = this.get('pki_data'); // contains one or more x509 certs
   pki_data = PayPro.X509Certificates.decode(pki_data);
   pki_data = pki_data.certificate;
-  var type = pki_type.split('+')[1].toUpperCase();
+  var type = pki_type !== 'none'
+    ? pki_type.split('+')[1].toUpperCase()
+    : pki_type;
   var buf = this.serializeForSig();
 
   var rsa = new KJUR.RSAKey();
   rsa.readPrivateKeyFromPEMString(key.toString());
   key = rsa;
 
-  var jsrsaSig = new KJUR.crypto.Signature({
-    alg: type + 'withRSA',
-    prov: 'cryptojs/jsrsa'
-  });
+  if (type !== 'none') {
+    var jsrsaSig = new KJUR.crypto.Signature({
+      alg: type + 'withRSA',
+      prov: 'cryptojs/jsrsa'
+    });
 
-  jsrsaSig.init(key);
+    jsrsaSig.init(key);
 
-  jsrsaSig.updateHex(buf.toString('hex'));
+    jsrsaSig.updateHex(buf.toString('hex'));
 
-  var sig = new Buffer(jsrsaSig.sign(), 'hex');
+    var sig = new Buffer(jsrsaSig.sign(), 'hex');
+  } else {
+    var sig = '';
+  }
 
   if (returnTrust) {
     var cert = pki_data[pki_data.length - 1];
@@ -66,20 +72,25 @@ PayPro.prototype.x509Verify = function(returnTrust) {
   pki_data = PayPro.X509Certificates.decode(pki_data);
   pki_data = pki_data.certificate;
   var buf = this.serializeForSig();
-  var type = pki_type.split('+')[1].toUpperCase();
+  var type = pki_type !== 'none'
+    ? pki_type.split('+')[1].toUpperCase()
+    : pki_type;
 
-  var jsrsaSig = new KJUR.crypto.Signature({
-    alg: type + 'withRSA',
-    prov: 'cryptojs/jsrsa'
-  });
-
-  var signedCert = pki_data[0];
-  var der = signedCert.toString('hex');
-  // var pem = self._DERtoPEM(der, 'CERTIFICATE');
-  var pem = KJUR.asn1.ASN1Util.getPEMStringFromHex(der, 'CERTIFICATE');
-  jsrsaSig.initVerifyByCertificatePEM(pem);
-  jsrsaSig.updateHex(buf.toString('hex'));
-  var verified = jsrsaSig.verify(sig.toString('hex'));
+  if (type !== 'none') {
+    var jsrsaSig = new KJUR.crypto.Signature({
+      alg: type + 'withRSA',
+      prov: 'cryptojs/jsrsa'
+    });
+    var signedCert = pki_data[0];
+    var der = signedCert.toString('hex');
+    // var pem = self._DERtoPEM(der, 'CERTIFICATE');
+    var pem = KJUR.asn1.ASN1Util.getPEMStringFromHex(der, 'CERTIFICATE');
+    jsrsaSig.initVerifyByCertificatePEM(pem);
+    jsrsaSig.updateHex(buf.toString('hex'));
+    var verified = jsrsaSig.verify(sig.toString('hex'));
+  } else {
+    var verified = true;
+  }
 
   var chain = pki_data;
 
@@ -122,7 +133,27 @@ PayPro.prototype.x509Verify = function(returnTrust) {
     return verified;
   }
 
-  var chainVerified = chain.every(function(cert, i) {
+  var chainVerified = PayPro.verifyCertChain(chain, type);
+
+  if (returnTrust) {
+    return {
+      selfSigned: 0, // no
+      isChain: true,
+      verified: verified,
+      caTrusted: !!caName,
+      caName: caName || null,
+      chainVerified: chainVerified
+    };
+  }
+
+  return verified && chainVerified;
+};
+
+PayPro.verifyCertChain = function(chain, sigHashAlg) {
+  if (sigHashAlg === 'none') {
+    return true;
+  }
+  return chain.every(function(cert, i) {
     var der = cert.toString('hex');
     // var pem = self._DERtoPEM(der, 'CERTIFICATE');
     var pem = KJUR.asn1.ASN1Util.getPEMStringFromHex(der, 'CERTIFICATE');
@@ -146,16 +177,21 @@ PayPro.prototype.x509Verify = function(returnTrust) {
     //
     var ndata = new Buffer(nder, 'hex');
     var nc = rfc3280.Certificate.decode(ndata, 'der');
+    var npubKeyAlg = PayPro.getAlgorithm(
+      nc.tbsCertificate.subjectPublicKeyInfo.algorithm.algorithm);
 
     //
     // Get Public Key from next certificate (via KJUR because it's a mess):
     //
-    var js = new KJUR.crypto.Signature({
-      alg: type + 'withRSA',
-      prov: 'cryptojs/jsrsa'
-    });
-    js.initVerifyByCertificatePEM(npem);
-    var npubKey = js.pubKey;
+    if (sigHashAlg !== 'none') {
+      var js = new KJUR.crypto.Signature({
+        alg: sigHashAlg + 'withRSA',
+        prov: 'cryptojs/jsrsa'
+      });
+      js.initVerifyByCertificatePEM(npem);
+      var npubKey = js.pubKey;
+    }
+    // XXX Somehow change the pubKey format to npubKeyAlg.
 
     //
     // Get Signature Value from current certificate:
@@ -179,37 +215,28 @@ PayPro.prototype.x509Verify = function(returnTrust) {
     // Verify current Certificate signature
     //
 
-    var jsrsaSig = new KJUR.crypto.Signature({
-      alg: type + 'withRSA',
-      prov: 'cryptojs/jsrsa'
-    });
-    jsrsaSig.initVerifyByPublicKey(npubKey);
+    if (sigHashAlg !== 'none') {
+      var jsrsaSig = new KJUR.crypto.Signature({
+        alg: sigHashAlg + 'withRSA',
+        prov: 'cryptojs/jsrsa'
+      });
+      jsrsaSig.initVerifyByPublicKey(npubKey);
 
-    // Get the raw DER TBSCertificate
-    // from the DER Certificate:
-    var tbs = PayPro.getTBSCertificate(data);
+      // Get the raw DER TBSCertificate
+      // from the DER Certificate:
+      var tbs = PayPro.getTBSCertificate(data);
 
-    jsrsaSig.updateHex(tbs.toString('hex'));
+      jsrsaSig.updateHex(tbs.toString('hex'));
 
-    var sigVerified = jsrsaSig.verify(sig.toString('hex'));
+      var sigVerified = jsrsaSig.verify(sig.toString('hex'));
+    } else {
+      var sigVerified = true;
+    }
 
     return validityVerified
       && issuerVerified
       && sigVerified;
   });
-
-  if (returnTrust) {
-    return {
-      selfSigned: 0, // no
-      isChain: true,
-      verified: verified,
-      caTrusted: !!caName,
-      caName: caName || null,
-      chainVerified: chainVerified
-    };
-  }
-
-  return verified && chainVerified;
 };
 
 module.exports = PayPro;