| 1 | var aes = require('./aes')
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| 2 | var Transform = require('cipher-base')
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| 3 | var inherits = require('inherits')
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| 4 |
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| 5 | inherits(StreamCipher, Transform)
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| 6 | module.exports = StreamCipher
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| 7 | function StreamCipher (mode, key, iv, decrypt) {
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| 8 | if (!(this instanceof StreamCipher)) {
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| 9 | return new StreamCipher(mode, key, iv)
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| 10 | }
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| 11 | Transform.call(this)
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| 12 | this._cipher = new aes.AES(key)
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| 13 | this._prev = new Buffer(iv.length)
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| 14 | this._cache = new Buffer('')
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| 15 | this._secCache = new Buffer('')
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| 16 | this._decrypt = decrypt
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| 17 | iv.copy(this._prev)
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| 18 | this._mode = mode
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| 19 | }
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| 20 | StreamCipher.prototype._update = function (chunk) {
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| 21 | return this._mode.encrypt(this, chunk, this._decrypt)
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| 22 | }
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| 23 | StreamCipher.prototype._final = function () {
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| 24 | this._cipher.scrub()
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| 25 | }
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