var CipherBase = require('cipher-base')
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var des = require('des.js')
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var inherits = require('inherits')
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var Buffer = require('safe-buffer').Buffer
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var modes = {
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'des-ede3-cbc': des.CBC.instantiate(des.EDE),
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'des-ede3': des.EDE,
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'des-ede-cbc': des.CBC.instantiate(des.EDE),
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'des-ede': des.EDE,
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'des-cbc': des.CBC.instantiate(des.DES),
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'des-ecb': des.DES
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}
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modes.des = modes['des-cbc']
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modes.des3 = modes['des-ede3-cbc']
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module.exports = DES
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inherits(DES, CipherBase)
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function DES (opts) {
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CipherBase.call(this)
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var modeName = opts.mode.toLowerCase()
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var mode = modes[modeName]
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var type
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if (opts.decrypt) {
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type = 'decrypt'
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} else {
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type = 'encrypt'
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}
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var key = opts.key
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if (!Buffer.isBuffer(key)) {
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key = Buffer.from(key)
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}
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if (modeName === 'des-ede' || modeName === 'des-ede-cbc') {
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key = Buffer.concat([key, key.slice(0, 8)])
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}
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var iv = opts.iv
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if (!Buffer.isBuffer(iv)) {
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iv = Buffer.from(iv)
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}
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this._des = mode.create({
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key: key,
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iv: iv,
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type: type
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})
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}
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DES.prototype._update = function (data) {
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return Buffer.from(this._des.update(data))
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}
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DES.prototype._final = function () {
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return Buffer.from(this._des.final())
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}
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