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33 lines
869 B
33 lines
869 B
var Buffer = require('safe-buffer').Buffer |
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var xor = require('buffer-xor') |
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function encryptStart (self, data, decrypt) { |
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var len = data.length |
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var out = xor(data, self._cache) |
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self._cache = self._cache.slice(len) |
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self._prev = Buffer.concat([self._prev, decrypt ? data : out]) |
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return out |
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} |
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exports.encrypt = function (self, data, decrypt) { |
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var out = Buffer.allocUnsafe(0) |
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var len |
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while (data.length) { |
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if (self._cache.length === 0) { |
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self._cache = self._cipher.encryptBlock(self._prev) |
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self._prev = Buffer.allocUnsafe(0) |
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} |
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if (self._cache.length <= data.length) { |
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len = self._cache.length |
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out = Buffer.concat([out, encryptStart(self, data.slice(0, len), decrypt)]) |
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data = data.slice(len) |
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} else { |
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out = Buffer.concat([out, encryptStart(self, data, decrypt)]) |
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break |
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} |
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} |
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return out |
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}
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