/base/000_base/bower_components/cryptojslib/components/evpkdf.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 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); |
}; |
}()); |