import CryptoJS from 'crypto-js'

export default class crypto {
  // 使用AesUtil.genAesKey()生成,需和后端配置保持一致
  static aesKey = 'O2BEeIv399qHQNhD6aGW8R8DEj4bqHXm';

  // 使用DesUtil.genDesKey()生成,需和后端配置保持一致
  static desKey = 'jMVCBsFGDQr1USHo';

  /**
   * aes 加密方法
   * @param data
   * @returns {*}
   */
  static encrypt (data) {
    return this.encryptAES(data, this.aesKey)
  }

  /**
   * aes 解密方法
   * @param data
   * @returns {*}
   */
  static decrypt (data) {
    return this.decryptAES(data, this.aesKey)
  }

  /**
   * aes 加密方法，同java：AesUtil.encryptToBase64(text, aesKey);
   */
  static encryptAES (data, key) {
    const dataBytes = CryptoJS.enc.Utf8.parse(data)
    const keyBytes = CryptoJS.enc.Utf8.parse(key)
    const encrypted = CryptoJS.AES.encrypt(dataBytes, keyBytes, {
      iv: keyBytes,
      mode: CryptoJS.mode.CBC,
      padding: CryptoJS.pad.Pkcs7
    })
    return CryptoJS.enc.Base64.stringify(encrypted.ciphertext)
  }

  /**
   * aes 解密方法，同java：AesUtil.decryptFormBase64ToString(encrypt, aesKey);
   */
  static decryptAES (data, key) {
    const keyBytes = CryptoJS.enc.Utf8.parse(key)
    const decrypted = CryptoJS.AES.decrypt(data, keyBytes, {
      iv: keyBytes,
      mode: CryptoJS.mode.CBC,
      padding: CryptoJS.pad.Pkcs7
    })
    return CryptoJS.enc.Utf8.stringify(decrypted)
  }

  /**
   * des 加密方法，同java：DesUtil.encryptToBase64(text, desKey)
   */
  static encryptDES (data, key) {
    const keyHex = CryptoJS.enc.Utf8.parse(key)
    const encrypted = CryptoJS.DES.encrypt(data, keyHex, {
      mode: CryptoJS.mode.ECB,
      padding: CryptoJS.pad.Pkcs7
    })
    return encrypted.toString()
  }

  /**
   * des 解密方法，同java：DesUtil.decryptFormBase64(encryptBase64, desKey);
   */
  static decryptDES (data, key) {
    const keyHex = CryptoJS.enc.Utf8.parse(key)
    const decrypted = CryptoJS.DES.decrypt({
      ciphertext: CryptoJS.enc.Base64.parse(data)
    }, keyHex, {
      mode: CryptoJS.mode.ECB,
      padding: CryptoJS.pad.Pkcs7
    })
    return decrypted.toString(CryptoJS.enc.Utf8)
  }
}
