diff --git a/README.md b/README.md
index 2fc511fe..23a45c79 100644
--- a/README.md
+++ b/README.md
@@ -164,7 +164,7 @@ Where
 
 Use `getModulus` to get the modulus for a certificate, a CSR or a private key. Modulus can be useful to check that a Private Key Matches a Certificate
 
-    pem.getModulus(certificate, callback)
+    pem.getModulus(certificate, [password,] callback)
 
 Where
 
diff --git a/lib/pem.js b/lib/pem.js
index 43143807..8a02aade 100644
--- a/lib/pem.js
+++ b/lib/pem.js
@@ -18,7 +18,6 @@ module.exports.readCertificateInfo = readCertificateInfo;
 module.exports.getPublicKey = getPublicKey;
 module.exports.getFingerprint = getFingerprint;
 module.exports.getModulus = getModulus;
-module.exports.getModulusFromProtected = getModulusFromProtected;
 module.exports.getDhparamInfo = getDhparamInfo;
 module.exports.createPkcs12 = createPkcs12;
 module.exports.readPkcs12 = readPkcs12;
@@ -436,9 +435,15 @@ function readCertificateInfo(certificate, callback) {
  * get the modulus from a certificate, a CSR or a private key
  *
  * @param {String} certificate PEM encoded, CSR PEM encoded, or private key
+ * @param {String} password password for the certificate
  * @param {Function} callback Callback function with an error object and {modulus}
  */
-function getModulus(certificate, callback) {
+function getModulus(certificate, password, callback) {
+    if (!callback && typeof password === 'function') {
+        callback = password;
+        password = undefined;
+    }
+
     certificate = Buffer.isBuffer(certificate) && certificate.toString() || certificate;
 
     var type = '';
@@ -455,45 +460,13 @@ function getModulus(certificate, callback) {
         '-in',
         '--TMPFILE--'
     ];
-    spawnWrapper(params, certificate, function(err, code, stdout) {
-        if (err) {
-            return callback(err);
-        }
-        var match = stdout.match(/Modulus=([0-9a-fA-F]+)$/m);
-        if (match) {
-            return callback(null, {
-                modulus: match[1]
-            });
-        } else {
-            return callback(new Error('No modulus'));
-        }
-    });
-}
-
-function getModulusFromProtected(key, password, callback){
-    key = Buffer.isBuffer(key) && key.toString() || key;
-
-    var type = '';
-    if (key.match(/BEGIN(\sNEW)? CERTIFICATE REQUEST/)) {
-        type = 'req';
-    } else if (key.match(/BEGIN RSA PRIVATE KEY/) || key.match(/BEGIN PRIVATE KEY/)) {
-        type = 'rsa';
-    } else {
-        type = 'x509';
-    }
-    var params = [type,
-        '-noout',
-        '-modulus',
-        '-in',
-        '--TMPFILE--'
-    ];
 
     if (password) {
         params.push( '-passin');
         params.push( 'pass:' + password);
     }
 
-    spawnWrapper(params, key, function(err, code, stdout) {
+    spawnWrapper(params, certificate, function(err, code, stdout) {
         if (err) {
             return callback(err);
         }
diff --git a/test/pem.js b/test/pem.js
index e5f4c97c..c5bf8690 100644
--- a/test/pem.js
+++ b/test/pem.js
@@ -453,7 +453,7 @@ exports['General Tests'] = {
             test.ok(certmodulus);
             test.ok(certmodulus.match(/^[0-9A-F]*$/));
             test.ok(fs.readdirSync('./tmp').length === 0);
-            pem.getModulusFromProtected(key, 'password' ,function(error, data) {
+            pem.getModulus(key, 'password' ,function(error, data) {
                 var keymodulus = (data && data.modulus || '').toString();
                 test.ifError(error);
                 test.ok(keymodulus);