paypro: start handling certificate extensions.

lib/PayPro.js

@@ -128,6 +128,46 @@ PayPro.prototype.x509Verify = function() {
       });
     });
 
+    //
+    // Handle Cert Extensions
+    // http://tools.ietf.org/html/rfc5280#section-4.2
+    //
+
+    // Basic Constraints
+    var basicConstraints = nc.tbsCertificate.extensions.filter(function(ext) {
+      return ext.extnID[3] === 19;
+    })[0];
+
+    // Key Usage
+    var keyUsage = nc.tbsCertificate.extensions.filter(function(ext) {
+      return ext.extnID[3] === 15;
+    })[0];
+
+    // Subject Key Identifier
+    var authKeyIdentifier = nc.tbsCertificate.extensions.filter(function(ext) {
+      return ext.extnID[3] === 14;
+    })[0];
+
+    // Authority Key Identifier
+    var authKeyIdentifier = nc.tbsCertificate.extensions.filter(function(ext) {
+      return ext.extnID[3] === 35;
+    })[0];
+
+    // Unknown Extension (not documented anywhere, probably non-standard)
+    var unknown = nc.tbsCertificate.extensions.filter(function(ext) {
+      return ext.extnID[3] === 1;
+    })[0];
+
+    // CRL Distribution Points
+    var CRLDistributionPoints = nc.tbsCertificate.extensions.filter(function(ext) {
+      return ext.extnID[3] === 31;
+    })[0];
+
+    // Certificate Policies
+    var certPolicies = nc.tbsCertificate.extensions.filter(function(ext) {
+      return ext.extnID[3] === 32;
+    })[0];
+
     //
     // Create a To-Be-Signed Certificate to verify using asn1.js:
     //