| 1 | var xor = require('buffer-xor')
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| 2 |
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| 3 | exports.encrypt = function (self, data, decrypt) {
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| 4 | var out = new Buffer('')
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| 5 | var len
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| 6 |
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| 7 | while (data.length) {
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| 8 | if (self._cache.length === 0) {
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| 9 | self._cache = self._cipher.encryptBlock(self._prev)
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| 10 | self._prev = new Buffer('')
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| 11 | }
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| 12 |
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| 13 | if (self._cache.length <= data.length) {
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| 14 | len = self._cache.length
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| 15 | out = Buffer.concat([out, encryptStart(self, data.slice(0, len), decrypt)])
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| 16 | data = data.slice(len)
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| 17 | } else {
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| 18 | out = Buffer.concat([out, encryptStart(self, data, decrypt)])
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| 19 | break
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| 20 | }
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| 21 | }
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| 22 |
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| 23 | return out
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| 24 | }
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| 25 | function encryptStart (self, data, decrypt) {
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| 26 | var len = data.length
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| 27 | var out = xor(data, self._cache)
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| 28 | self._cache = self._cache.slice(len)
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| 29 | self._prev = Buffer.concat([self._prev, decrypt ? data : out])
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| 30 | return out
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| 31 | }
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