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51 lines
1.2 KiB
51 lines
1.2 KiB
11 months ago
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/*!
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* Crypto-JS v1.1.0
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* http://code.google.com/p/crypto-js/
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* Copyright (c) 2009, Jeff Mott. All rights reserved.
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* http://code.google.com/p/crypto-js/wiki/License
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*/
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(function(){
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// Shortcut
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var util = Crypto.util;
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Crypto.PBKDF2 = function (password, salt, keylen, options) {
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// Defaults
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var hasher = options && options.hasher || Crypto.SHA1,
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iterations = options && options.iterations || 1;
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// Pseudo-random function
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function PRF(password, salt) {
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return Crypto.HMAC(hasher, salt, password, { asBytes: true });
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}
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// Generate key
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var derivedKeyBytes = [],
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blockindex = 1;
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while (derivedKeyBytes.length < keylen) {
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var block = PRF(password, salt + util.bytesToString(
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util.wordsToBytes([blockindex])));
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for (var u = block, i = 1; i < iterations; i++) {
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u = PRF(password, util.bytesToString(u));
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for (var j = 0; j < block.length; j++) block[j] ^= u[j];
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}
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derivedKeyBytes = derivedKeyBytes.concat(block);
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blockindex++;
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}
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// Truncate excess bytes
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derivedKeyBytes.length = keylen;
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return options && options.asBytes ? derivedKeyBytes :
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options && options.asString ? util.bytesToString(derivedKeyBytes) :
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util.bytesToHex(derivedKeyBytes);
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};
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})();
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