119 lines
3.6 KiB
JavaScript
119 lines
3.6 KiB
JavaScript
/*
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CryptoJS v3.1.2
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code.google.com/p/crypto-js
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(c) 2009-2013 by Jeff Mott. All rights reserved.
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code.google.com/p/crypto-js/wiki/License
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*/
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(function () {
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// Shortcuts
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var C = CryptoJS;
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var C_lib = C.lib;
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var Base = C_lib.Base;
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var WordArray = C_lib.WordArray;
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var C_algo = C.algo;
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var MD5 = C_algo.MD5;
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/**
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* This key derivation function is meant to conform with EVP_BytesToKey.
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* www.openssl.org/docs/crypto/EVP_BytesToKey.html
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*/
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var EvpKDF = C_algo.EvpKDF = Base.extend({
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/**
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* Configuration options.
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*
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* @property {number} keySize The key size in words to generate. Default: 4 (128 bits)
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* @property {Hasher} hasher The hash algorithm to use. Default: MD5
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* @property {number} iterations The number of iterations to perform. Default: 1
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*/
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cfg: Base.extend({
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keySize: 128/32,
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hasher: MD5,
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iterations: 1
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}),
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/**
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* Initializes a newly created key derivation function.
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*
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* @param {Object} cfg (Optional) The configuration options to use for the derivation.
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*
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* @example
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*
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* var kdf = CryptoJS.algo.EvpKDF.create();
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* var kdf = CryptoJS.algo.EvpKDF.create({ keySize: 8 });
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* var kdf = CryptoJS.algo.EvpKDF.create({ keySize: 8, iterations: 1000 });
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*/
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init: function (cfg) {
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this.cfg = this.cfg.extend(cfg);
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},
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/**
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* Derives a key from a password.
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*
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* @param {WordArray|string} password The password.
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* @param {WordArray|string} salt A salt.
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*
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* @return {WordArray} The derived key.
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*
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* @example
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*
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* var key = kdf.compute(password, salt);
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*/
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compute: function (password, salt) {
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// Shortcut
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var cfg = this.cfg;
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// Init hasher
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var hasher = cfg.hasher.create();
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// Initial values
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var derivedKey = WordArray.create();
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// Shortcuts
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var derivedKeyWords = derivedKey.words;
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var keySize = cfg.keySize;
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var iterations = cfg.iterations;
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// Generate key
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while (derivedKeyWords.length < keySize) {
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if (block) {
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hasher.update(block);
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}
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var block = hasher.update(password).finalize(salt);
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hasher.reset();
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// Iterations
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for (var i = 1; i < iterations; i++) {
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block = hasher.finalize(block);
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hasher.reset();
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}
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derivedKey.concat(block);
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}
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derivedKey.sigBytes = keySize * 4;
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return derivedKey;
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}
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});
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/**
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* Derives a key from a password.
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*
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* @param {WordArray|string} password The password.
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* @param {WordArray|string} salt A salt.
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* @param {Object} cfg (Optional) The configuration options to use for this computation.
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*
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* @return {WordArray} The derived key.
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*
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* @static
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*
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* @example
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*
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* var key = CryptoJS.EvpKDF(password, salt);
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* var key = CryptoJS.EvpKDF(password, salt, { keySize: 8 });
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* var key = CryptoJS.EvpKDF(password, salt, { keySize: 8, iterations: 1000 });
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*/
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C.EvpKDF = function (password, salt, cfg) {
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return EvpKDF.create(cfg).compute(password, salt);
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};
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}());
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