| 1 | function encryptByte (self, byteParam, decrypt) {
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| 2 | var pad = self._cipher.encryptBlock(self._prev)
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| 3 | var out = pad[0] ^ byteParam
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| 4 | self._prev = Buffer.concat([self._prev.slice(1), new Buffer([decrypt ? byteParam : out])])
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| 5 | return out
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| 6 | }
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| 7 | exports.encrypt = function (self, chunk, decrypt) {
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| 8 | var len = chunk.length
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| 9 | var out = new Buffer(len)
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| 10 | var i = -1
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| 11 | while (++i < len) {
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| 12 | out[i] = encryptByte(self, chunk[i], decrypt)
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| 13 | }
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| 14 | return out
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| 15 | }
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