/*!
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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.HMAC = function (hasher, message, key, options) {
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// Allow arbitrary length keys
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key = key.length > hasher._blocksize * 4 ?
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hasher(key, { asBytes: true }) :
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util.stringToBytes(key);
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// XOR keys with pad constants
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var okey = key,
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ikey = key.slice(0);
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for (var i = 0; i < hasher._blocksize * 4; i++) {
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okey[i] ^= 0x5C;
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ikey[i] ^= 0x36;
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}
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var hmacbytes = hasher(util.bytesToString(okey) +
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hasher(util.bytesToString(ikey) + message, { asString: true }),
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{ asBytes: true });
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return options && options.asBytes ? hmacbytes :
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options && options.asString ? util.bytesToString(hmacbytes) :
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util.bytesToHex(hmacbytes);
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};
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})();
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