26 lines
713 B
JavaScript
26 lines
713 B
JavaScript
var aes = require('./aes')
|
|
var Transform = require('cipher-base')
|
|
var inherits = require('inherits')
|
|
|
|
inherits(StreamCipher, Transform)
|
|
module.exports = StreamCipher
|
|
function StreamCipher (mode, key, iv, decrypt) {
|
|
if (!(this instanceof StreamCipher)) {
|
|
return new StreamCipher(mode, key, iv)
|
|
}
|
|
Transform.call(this)
|
|
this._cipher = new aes.AES(key)
|
|
this._prev = new Buffer(iv.length)
|
|
this._cache = new Buffer('')
|
|
this._secCache = new Buffer('')
|
|
this._decrypt = decrypt
|
|
iv.copy(this._prev)
|
|
this._mode = mode
|
|
}
|
|
StreamCipher.prototype._update = function (chunk) {
|
|
return this._mode.encrypt(this, chunk, this._decrypt)
|
|
}
|
|
StreamCipher.prototype._final = function () {
|
|
this._cipher.scrub()
|
|
}
|