summaryrefslogtreecommitdiffstats
path: root/middleware/node_modules/cookie-signature/index.js
diff options
context:
space:
mode:
Diffstat (limited to 'middleware/node_modules/cookie-signature/index.js')
-rw-r--r--middleware/node_modules/cookie-signature/index.js51
1 files changed, 51 insertions, 0 deletions
diff --git a/middleware/node_modules/cookie-signature/index.js b/middleware/node_modules/cookie-signature/index.js
new file mode 100644
index 0000000..b8c9463
--- /dev/null
+++ b/middleware/node_modules/cookie-signature/index.js
@@ -0,0 +1,51 @@
+/**
+ * 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');
+}