| 123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118 | /*CryptoJS v3.1.2code.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);    };}());
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