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- /**
- * Module dependencies.
- */
-
- var crypto = require('crypto');
-
- /**
- * Sign the given `val` with `secret`.
- *
- * @param {String} val
- * @param {String} secret
- * @return {String}
- * @api private
- */
-
- exports.sign = function(val, secret){
- if ('string' != typeof val) throw new TypeError("Cookie value must be provided as a string.");
- if ('string' != typeof secret) throw new TypeError("Secret string must be provided.");
- return val + '.' + crypto
- .createHmac('sha256', secret)
- .update(val)
- .digest('base64')
- .replace(/\=+$/, '');
- };
-
- /**
- * Unsign and decode the given `val` with `secret`,
- * returning `false` if the signature is invalid.
- *
- * @param {String} val
- * @param {String} secret
- * @return {String|Boolean}
- * @api private
- */
-
- exports.unsign = function(val, secret){
- if ('string' != typeof val) throw new TypeError("Signed cookie string must be provided.");
- if ('string' != typeof secret) throw new TypeError("Secret string must be provided.");
- var str = val.slice(0, val.lastIndexOf('.'))
- , mac = exports.sign(str, secret);
-
- return sha1(mac) == sha1(val) ? str : false;
- };
-
- /**
- * Private
- */
-
- function sha1(str){
- return crypto.createHash('sha1').update(str).digest('hex');
- }
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