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36 lines
617 B
36 lines
617 B
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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// Public API
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Crypto.mode.OFB = {
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encrypt: OFB,
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decrypt: OFB
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};
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// The mode function
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function OFB(cipher, m, iv) {
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var blockSizeInBytes = cipher._blocksize * 4,
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keystream = iv.slice(0);
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// Encrypt each byte
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for (var i = 0; i < m.length; i++) {
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// Generate keystream
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if (i % blockSizeInBytes == 0)
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cipher._encryptblock(keystream, 0);
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// Encrypt byte
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m[i] ^= keystream[i % blockSizeInBytes];
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}
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}
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})();
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