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-rw-r--r--library/cryptojs/components/evpkdf.js118
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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 WordArray = C_lib.WordArray;
- var C_algo = C.algo;
- var MD5 = C_algo.MD5;
-
- /**
- * This key derivation function is meant to conform with EVP_BytesToKey.
- * www.openssl.org/docs/crypto/EVP_BytesToKey.html
- */
- var EvpKDF = C_algo.EvpKDF = Base.extend({
- /**
- * Configuration options.
- *
- * @property {number} keySize The key size in words to generate. Default: 4 (128 bits)
- * @property {Hasher} hasher The hash algorithm to use. Default: MD5
- * @property {number} iterations The number of iterations to perform. Default: 1
- */
- cfg: Base.extend({
- keySize: 128/32,
- hasher: MD5,
- iterations: 1
- }),
-
- /**
- * Initializes a newly created key derivation function.
- *
- * @param {Object} cfg (Optional) The configuration options to use for the derivation.
- *
- * @example
- *
- * var kdf = CryptoJS.algo.EvpKDF.create();
- * var kdf = CryptoJS.algo.EvpKDF.create({ keySize: 8 });
- * var kdf = CryptoJS.algo.EvpKDF.create({ keySize: 8, iterations: 1000 });
- */
- init: function (cfg) {
- this.cfg = this.cfg.extend(cfg);
- },
-
- /**
- * Derives a key from a password.
- *
- * @param {WordArray|string} password The password.
- * @param {WordArray|string} salt A salt.
- *
- * @return {WordArray} The derived key.
- *
- * @example
- *
- * var key = kdf.compute(password, salt);
- */
- compute: function (password, salt) {
- // Shortcut
- var cfg = this.cfg;
-
- // Init hasher
- var hasher = cfg.hasher.create();
-
- // Initial values
- var derivedKey = WordArray.create();
-
- // Shortcuts
- var derivedKeyWords = derivedKey.words;
- var keySize = cfg.keySize;
- var iterations = cfg.iterations;
-
- // Generate key
- while (derivedKeyWords.length < keySize) {
- if (block) {
- hasher.update(block);
- }
- var block = hasher.update(password).finalize(salt);
- hasher.reset();
-
- // Iterations
- for (var i = 1; i < iterations; i++) {
- block = hasher.finalize(block);
- hasher.reset();
- }
-
- derivedKey.concat(block);
- }
- derivedKey.sigBytes = keySize * 4;
-
- return derivedKey;
- }
- });
-
- /**
- * Derives a key from a password.
- *
- * @param {WordArray|string} password The password.
- * @param {WordArray|string} salt A salt.
- * @param {Object} cfg (Optional) The configuration options to use for this computation.
- *
- * @return {WordArray} The derived key.
- *
- * @static
- *
- * @example
- *
- * var key = CryptoJS.EvpKDF(password, salt);
- * var key = CryptoJS.EvpKDF(password, salt, { keySize: 8 });
- * var key = CryptoJS.EvpKDF(password, salt, { keySize: 8, iterations: 1000 });
- */
- C.EvpKDF = function (password, salt, cfg) {
- return EvpKDF.create(cfg).compute(password, salt);
- };
-}());