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src/js/lib/cryptojs/hmac.js

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+/*
+CryptoJS v3.1.2
+code.google.com/p/crypto-js
+(c) 2009-2013 by Jeff Mott. All rights reserved.
+code.google.com/p/crypto-js/wiki/License
+*/
+(function () {
+    // Shortcuts
+    var C = CryptoJS;
+    var C_lib = C.lib;
+    var Base = C_lib.Base;
+    var C_enc = C.enc;
+    var Utf8 = C_enc.Utf8;
+    var C_algo = C.algo;
+
+    /**
+     * HMAC algorithm.
+     */
+    var HMAC = C_algo.HMAC = Base.extend({
+        /**
+         * Initializes a newly created HMAC.
+         *
+         * @param {Hasher} hasher The hash algorithm to use.
+         * @param {WordArray|string} key The secret key.
+         *
+         * @example
+         *
+         *     var hmacHasher = CryptoJS.algo.HMAC.create(CryptoJS.algo.SHA256, key);
+         */
+        init: function (hasher, key) {
+            // Init hasher
+            hasher = this._hasher = new hasher.init();
+
+            // Convert string to WordArray, else assume WordArray already
+            if (typeof key == 'string') {
+                key = Utf8.parse(key);
+            }
+
+            // Shortcuts
+            var hasherBlockSize = hasher.blockSize;
+            var hasherBlockSizeBytes = hasherBlockSize * 4;
+
+            // Allow arbitrary length keys
+            if (key.sigBytes > hasherBlockSizeBytes) {
+                key = hasher.finalize(key);
+            }
+
+            // Clamp excess bits
+            key.clamp();
+
+            // Clone key for inner and outer pads
+            var oKey = this._oKey = key.clone();
+            var iKey = this._iKey = key.clone();
+
+            // Shortcuts
+            var oKeyWords = oKey.words;
+            var iKeyWords = iKey.words;
+
+            // XOR keys with pad constants
+            for (var i = 0; i < hasherBlockSize; i++) {
+                oKeyWords[i] ^= 0x5c5c5c5c;
+                iKeyWords[i] ^= 0x36363636;
+            }
+            oKey.sigBytes = iKey.sigBytes = hasherBlockSizeBytes;
+
+            // Set initial values
+            this.reset();
+        },
+
+        /**
+         * Resets this HMAC to its initial state.
+         *
+         * @example
+         *
+         *     hmacHasher.reset();
+         */
+        reset: function () {
+            // Shortcut
+            var hasher = this._hasher;
+
+            // Reset
+            hasher.reset();
+            hasher.update(this._iKey);
+        },
+
+        /**
+         * Updates this HMAC with a message.
+         *
+         * @param {WordArray|string} messageUpdate The message to append.
+         *
+         * @return {HMAC} This HMAC instance.
+         *
+         * @example
+         *
+         *     hmacHasher.update('message');
+         *     hmacHasher.update(wordArray);
+         */
+        update: function (messageUpdate) {
+            this._hasher.update(messageUpdate);
+
+            // Chainable
+            return this;
+        },
+
+        /**
+         * Finalizes the HMAC computation.
+         * Note that the finalize operation is effectively a destructive, read-once operation.
+         *
+         * @param {WordArray|string} messageUpdate (Optional) A final message update.
+         *
+         * @return {WordArray} The HMAC.
+         *
+         * @example
+         *
+         *     var hmac = hmacHasher.finalize();
+         *     var hmac = hmacHasher.finalize('message');
+         *     var hmac = hmacHasher.finalize(wordArray);
+         */
+        finalize: function (messageUpdate) {
+            // Shortcut
+            var hasher = this._hasher;
+
+            // Compute HMAC
+            var innerHash = hasher.finalize(messageUpdate);
+            hasher.reset();
+            var hmac = hasher.finalize(this._oKey.clone().concat(innerHash));
+
+            return hmac;
+        }
+    });
+}());