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25 lines
518 B
25 lines
518 B
var Buffer = require('safe-buffer').Buffer |
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function encryptByte (self, byteParam, decrypt) { |
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var pad = self._cipher.encryptBlock(self._prev) |
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var out = pad[0] ^ byteParam |
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self._prev = Buffer.concat([ |
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self._prev.slice(1), |
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Buffer.from([decrypt ? byteParam : out]) |
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]) |
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return out |
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} |
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exports.encrypt = function (self, chunk, decrypt) { |
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var len = chunk.length |
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var out = Buffer.allocUnsafe(len) |
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var i = -1 |
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while (++i < len) { |
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out[i] = encryptByte(self, chunk[i], decrypt) |
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} |
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return out |
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}
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