diff --git a/lib/passport-http/strategies/digest.js b/lib/passport-http/strategies/digest.js
index f0433e8..e86e466 100644
--- a/lib/passport-http/strategies/digest.js
+++ b/lib/passport-http/strategies/digest.js
@@ -66,7 +66,7 @@ function DigestStrategy(options, secret, validate) {
     options = {};
   }
   if (!secret) throw new Error('HTTP Digest authentication strategy requires a secret function');
-  
+
   passport.Strategy.call(this);
   this.name = 'digest';
   this._secret = secret;
@@ -80,6 +80,7 @@ function DigestStrategy(options, secret, validate) {
   if (options.qop) {
     this._qop = (Array.isArray(options.qop)) ? options.qop : [ options.qop ];
   }
+  this._passReqToCallback = options.passReqToCallback;
 }
 
 /**
@@ -97,28 +98,28 @@ util.inherits(DigestStrategy, passport.Strategy);
 DigestStrategy.prototype.authenticate = function(req) {
   var authorization = req.headers['authorization'];
   if (!authorization) { return this.fail(this._challenge()); }
-  
+
   var parts = authorization.split(' ')
   if (parts.length < 2) { return this.fail(400); }
-  
+
   var scheme = parts[0]
     , params = parts.slice(1).join(' ');
-  
+
   if (!/Digest/i.test(scheme)) { return this.fail(this._challenge()); }
-  
+
   var creds = parse(params);
   if (Object.keys(creds).length === 0) { return this.fail(400); }
-  
+
   if (!creds.username) {
     return this.fail(this._challenge());
   }
   if (req.url !== creds.uri) {
     return this.fail(400);
   }
-  
-  
+
+
   var self = this;
-  
+
   // Use of digest authentication requires a password (aka shared secret) known
   // to both the client and server, but not transported over the wire.  This
   // secret is needed in order to compute the hashes required to authenticate
@@ -128,10 +129,11 @@ DigestStrategy.prototype.authenticate = function(req) {
   // However, the user will only be successfully authenticated if the password
   // is correct, as indicated by the challenge response matching the computed
   // value.
-  this._secret(creds.username, function(err, user, password) {
+
+  function secretCallback (err, user, password) {
     if (err) { return self.error(err); }
     if (!user) { return self.fail(self._challenge()); }
-    
+
     var ha1;
     if (!creds.algorithm || creds.algorithm === 'MD5') {
       if (typeof password === 'object' && password.ha1) {
@@ -151,7 +153,7 @@ DigestStrategy.prototype.authenticate = function(req) {
     } else {
       return self.fail(400);
     }
-    
+
     var ha2;
     if (!creds.qop || creds.qop === 'auth') {
       ha2 = md5(req.method + ":" + creds.uri);
@@ -166,7 +168,7 @@ DigestStrategy.prototype.authenticate = function(req) {
     } else {
       return self.fail(400);
     }
-    
+
     var digest;
     if (!creds.qop) {
       digest = md5(ha1 + ":" + creds.nonce + ":" + ha2);
@@ -175,7 +177,7 @@ DigestStrategy.prototype.authenticate = function(req) {
     } else {
       return self.fail(400);
     }
-    
+
     if (creds.response != digest) {
       return self.fail(self._challenge());
     } else {
@@ -195,7 +197,13 @@ DigestStrategy.prototype.authenticate = function(req) {
         self.success(user);
       }
     }
-  });
+  }
+
+  if (this._passReqToCallback) {
+    this._secret(req, creds.username, secretCallback);
+  } else {
+    this._secret(creds.username, secretCallback);
+  }
 }
 
 /**
@@ -206,7 +214,7 @@ DigestStrategy.prototype.authenticate = function(req) {
 DigestStrategy.prototype._challenge = function() {
   // TODO: For maximum flexibility, a mechanism for delegating the generation
   //       of the nonce and opaque data to the application would be useful.
-  
+
   var challenge = 'Digest realm="' + this._realm + '"';
   if (this._domain) {
     challenge += ', domain="' + this._domain.join(' ') + '"';
@@ -221,7 +229,7 @@ DigestStrategy.prototype._challenge = function() {
   if (this._qop) {
     challenge += ', qop="' + this._qop.join(',') + '"';
   }
-  
+
   return challenge;
 }
 
@@ -294,5 +302,5 @@ function md5(str, encoding){
 
 /**
  * Expose `DigestStrategy`.
- */ 
+ */
 module.exports = DigestStrategy;