var aes = require('./aes')
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var Buffer = require('safe-buffer').Buffer
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var Transform = require('cipher-base')
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var inherits = require('inherits')
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function StreamCipher (mode, key, iv, decrypt) {
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Transform.call(this)
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this._cipher = new aes.AES(key)
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this._prev = Buffer.from(iv)
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this._cache = Buffer.allocUnsafe(0)
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this._secCache = Buffer.allocUnsafe(0)
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this._decrypt = decrypt
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this._mode = mode
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}
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inherits(StreamCipher, Transform)
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StreamCipher.prototype._update = function (chunk) {
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return this._mode.encrypt(this, chunk, this._decrypt)
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}
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StreamCipher.prototype._final = function () {
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this._cipher.scrub()
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}
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module.exports = StreamCipher
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