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-rw-r--r--library/cryptojs/components/hmac.js131
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diff --git a/library/cryptojs/components/hmac.js b/library/cryptojs/components/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;
- }
- });
-}());