/*
 * @Author: zcxb chen13157379235@outlook.com
 * @Date: 2022-09-21 09:41:45
 * @LastEditors: huyang huyang@myun.info
 * @LastEditTime: 2022-10-13 00:32:11
 * @FilePath: \jd-openapi-serviced:\work\Myun\repos\github\LuLuCodes\easy-front-core-sdk\packages\jos\src\security\common\KeyEncryption.ts
 * @Description:
 *
 * Copyright (c) 2022 by zcxb chen13157379235@outlook.com, All Rights Reserved.
 */
import { Mkey } from '../Mkey'
import * as crypto from 'crypto'

export class KeyEncryption {
  static IV_SIZE = 16

  static aes_decrypt(m_key: Mkey, ct: Buffer) {
    const iv = ct.subarray(0, KeyEncryption.IV_SIZE)

    const crypted = ct.subarray(this.IV_SIZE).toString('binary')
    let decipher = crypto.createDecipheriv('aes-128-cbc', m_key.s_key, iv)
    // 设置自动 padding 为 true，删除填充补位
    decipher.setAutoPadding(true)
    let decoded = decipher.update(crypted, 'binary', 'utf8')
    decoded += decipher.final('utf8')
    return decoded
    // const result = decoded.substring(0, -decoded.charCodeAt(decoded.length - 1))
    // return result
  }
}