function useDecrypt() {
  const keyStr = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/='
  function encode64(input) {
    let output = ''
    let chr1,
      chr2,
      chr3 = ''
    let enc1,
      enc2,
      enc3,
      enc4 = ''
    let i = 0
    do {
      chr1 = input.charCodeAt(i++)
      chr2 = input.charCodeAt(i++)
      chr3 = input.charCodeAt(i++)
      enc1 = chr1 >> 2
      enc2 = ((chr1 & 3) << 4) | (chr2 >> 4)
      enc3 = ((chr2 & 15) << 2) | (chr3 >> 6)
      enc4 = chr3 & 63
      if (isNaN(chr2)) {
        enc3 = enc4 = 64
      } else if (isNaN(chr3)) {
        enc4 = 64
      }
      output =
        output +
        keyStr.charAt(enc1) +
        keyStr.charAt(enc2) +
        keyStr.charAt(enc3) +
        keyStr.charAt(enc4)
      chr1 = chr2 = chr3 = ''
      enc1 = enc2 = enc3 = enc4 = ''
    } while (i < input.length)
    return output
  }

  function utf16to8(str) {
    let out,
      i,
      len = 0,
      c

    out = ''
    len = str.length
    for (i = 0; i < len; i++) {
      c = str.charCodeAt(i)
      if (c >= 0x0001 && c <= 0x007f) {
        out += str.charAt(i)
      } else if (c > 0x07ff) {
        out += String.fromCharCode(0xe0 | ((c >> 12) & 0x0f))
        out += String.fromCharCode(0x80 | ((c >> 6) & 0x3f))
        out += String.fromCharCode(0x80 | ((c >> 0) & 0x3f))
      } else {
        out += String.fromCharCode(0xc0 | ((c >> 6) & 0x1f))
        out += String.fromCharCode(0x80 | ((c >> 0) & 0x3f))
      }
    }
    return out
  }

  function utf8to16(str) {
    let out,
      i,
      len = 0,
      c
    let char2, char3

    out = ''
    len = str.length
    i = 0
    while (i < len) {
      c = str.charCodeAt(i++)
      switch (c >> 4) {
        case 0:
        case 1:
        case 2:
        case 3:
        case 4:
        case 5:
        case 6:
        case 7:
          // 0xxxxxxx
          out += str.charAt(i - 1)
          break
        case 12:
        case 13:
          // 110x xxxx   10xx xxxx
          char2 = str.charCodeAt(i++)
          out += String.fromCharCode(((c & 0x1f) << 6) | (char2 & 0x3f))
          break
        case 14:
          // 1110 xxxx  10xx xxxx  10xx xxxx
          char2 = str.charCodeAt(i++)
          char3 = str.charCodeAt(i++)
          out += String.fromCharCode(
            ((c & 0x0f) << 12) | ((char2 & 0x3f) << 6) | ((char3 & 0x3f) << 0)
          )
          break
      }
    }
    return out
  }
  function hex_md5(s) {
    return binl2hex(core_md5(str2binl(s), s.length * chrsz))
  }
  const hexcase = 0 /* hex output format. 0 - lowercase; 1 - uppercase        */
  const b64pad = '' /* base-64 pad character. "=" for strict RFC compliance   */
  const chrsz = 8 /* bits per input character. 8 - ASCII; 16 - Unicode      */
  /*
   * Convert a string to an array of little-endian words
   * If chrsz is ASCII, characters >255 have their hi-byte silently ignored.
   */
  function str2binl(str) {
    const bin = []
    const mask = (1 << chrsz) - 1
    for (let i = 0; i < str.length * chrsz; i += chrsz)
      bin[i >> 5] |= (str.charCodeAt(i / chrsz) & mask) << i % 32
    return bin
  }
  /*
   * Add integers, wrapping at 2^32. This uses 16-bit operations internally
   * to work around bugs in some JS interpreters.
   */
  function safe_add(x, y) {
    const lsw = (x & 0xffff) + (y & 0xffff)
    const msw = (x >> 16) + (y >> 16) + (lsw >> 16)
    return (msw << 16) | (lsw & 0xffff)
  }

  /*
   * Bitwise rotate a 32-bit number to the left.
   */
  function bit_rol(num, cnt) {
    return (num << cnt) | (num >>> (32 - cnt))
  }
  /*
   * These functions implement the four basic operations the algorithm uses.
   */
  function md5_cmn(q, a, b, x, s, t) {
    return safe_add(bit_rol(safe_add(safe_add(a, q), safe_add(x, t)), s), b)
  }
  function md5_ff(a, b, c, d, x, s, t) {
    return md5_cmn((b & c) | (~b & d), a, b, x, s, t)
  }
  function md5_gg(a, b, c, d, x, s, t) {
    return md5_cmn((b & d) | (c & ~d), a, b, x, s, t)
  }
  function md5_hh(a, b, c, d, x, s, t) {
    return md5_cmn(b ^ c ^ d, a, b, x, s, t)
  }
  function md5_ii(a, b, c, d, x, s, t) {
    return md5_cmn(c ^ (b | ~d), a, b, x, s, t)
  }

  function core_md5(x, len) {
    /* append padding */
    x[len >> 5] |= 0x80 << len % 32
    x[(((len + 64) >>> 9) << 4) + 14] = len

    let a = 1732584193
    let b = -271733879
    let c = -1732584194
    let d = 271733878

    for (let i = 0; i < x.length; i += 16) {
      const olda = a
      const oldb = b
      const oldc = c
      const oldd = d

      a = md5_ff(a, b, c, d, x[i + 0], 7, -680876936)
      d = md5_ff(d, a, b, c, x[i + 1], 12, -389564586)
      c = md5_ff(c, d, a, b, x[i + 2], 17, 606105819)
      b = md5_ff(b, c, d, a, x[i + 3], 22, -1044525330)
      a = md5_ff(a, b, c, d, x[i + 4], 7, -176418897)
      d = md5_ff(d, a, b, c, x[i + 5], 12, 1200080426)
      c = md5_ff(c, d, a, b, x[i + 6], 17, -1473231341)
      b = md5_ff(b, c, d, a, x[i + 7], 22, -45705983)
      a = md5_ff(a, b, c, d, x[i + 8], 7, 1770035416)
      d = md5_ff(d, a, b, c, x[i + 9], 12, -1958414417)
      c = md5_ff(c, d, a, b, x[i + 10], 17, -42063)
      b = md5_ff(b, c, d, a, x[i + 11], 22, -1990404162)
      a = md5_ff(a, b, c, d, x[i + 12], 7, 1804603682)
      d = md5_ff(d, a, b, c, x[i + 13], 12, -40341101)
      c = md5_ff(c, d, a, b, x[i + 14], 17, -1502002290)
      b = md5_ff(b, c, d, a, x[i + 15], 22, 1236535329)

      a = md5_gg(a, b, c, d, x[i + 1], 5, -165796510)
      d = md5_gg(d, a, b, c, x[i + 6], 9, -1069501632)
      c = md5_gg(c, d, a, b, x[i + 11], 14, 643717713)
      b = md5_gg(b, c, d, a, x[i + 0], 20, -373897302)
      a = md5_gg(a, b, c, d, x[i + 5], 5, -701558691)
      d = md5_gg(d, a, b, c, x[i + 10], 9, 38016083)
      c = md5_gg(c, d, a, b, x[i + 15], 14, -660478335)
      b = md5_gg(b, c, d, a, x[i + 4], 20, -405537848)
      a = md5_gg(a, b, c, d, x[i + 9], 5, 568446438)
      d = md5_gg(d, a, b, c, x[i + 14], 9, -1019803690)
      c = md5_gg(c, d, a, b, x[i + 3], 14, -187363961)
      b = md5_gg(b, c, d, a, x[i + 8], 20, 1163531501)
      a = md5_gg(a, b, c, d, x[i + 13], 5, -1444681467)
      d = md5_gg(d, a, b, c, x[i + 2], 9, -51403784)
      c = md5_gg(c, d, a, b, x[i + 7], 14, 1735328473)
      b = md5_gg(b, c, d, a, x[i + 12], 20, -1926607734)

      a = md5_hh(a, b, c, d, x[i + 5], 4, -378558)
      d = md5_hh(d, a, b, c, x[i + 8], 11, -2022574463)
      c = md5_hh(c, d, a, b, x[i + 11], 16, 1839030562)
      b = md5_hh(b, c, d, a, x[i + 14], 23, -35309556)
      a = md5_hh(a, b, c, d, x[i + 1], 4, -1530992060)
      d = md5_hh(d, a, b, c, x[i + 4], 11, 1272893353)
      c = md5_hh(c, d, a, b, x[i + 7], 16, -155497632)
      b = md5_hh(b, c, d, a, x[i + 10], 23, -1094730640)
      a = md5_hh(a, b, c, d, x[i + 13], 4, 681279174)
      d = md5_hh(d, a, b, c, x[i + 0], 11, -358537222)
      c = md5_hh(c, d, a, b, x[i + 3], 16, -722521979)
      b = md5_hh(b, c, d, a, x[i + 6], 23, 76029189)
      a = md5_hh(a, b, c, d, x[i + 9], 4, -640364487)
      d = md5_hh(d, a, b, c, x[i + 12], 11, -421815835)
      c = md5_hh(c, d, a, b, x[i + 15], 16, 530742520)
      b = md5_hh(b, c, d, a, x[i + 2], 23, -995338651)

      a = md5_ii(a, b, c, d, x[i + 0], 6, -198630844)
      d = md5_ii(d, a, b, c, x[i + 7], 10, 1126891415)
      c = md5_ii(c, d, a, b, x[i + 14], 15, -1416354905)
      b = md5_ii(b, c, d, a, x[i + 5], 21, -57434055)
      a = md5_ii(a, b, c, d, x[i + 12], 6, 1700485571)
      d = md5_ii(d, a, b, c, x[i + 3], 10, -1894986606)
      c = md5_ii(c, d, a, b, x[i + 10], 15, -1051523)
      b = md5_ii(b, c, d, a, x[i + 1], 21, -2054922799)
      a = md5_ii(a, b, c, d, x[i + 8], 6, 1873313359)
      d = md5_ii(d, a, b, c, x[i + 15], 10, -30611744)
      c = md5_ii(c, d, a, b, x[i + 6], 15, -1560198380)
      b = md5_ii(b, c, d, a, x[i + 13], 21, 1309151649)
      a = md5_ii(a, b, c, d, x[i + 4], 6, -145523070)
      d = md5_ii(d, a, b, c, x[i + 11], 10, -1120210379)
      c = md5_ii(c, d, a, b, x[i + 2], 15, 718787259)
      b = md5_ii(b, c, d, a, x[i + 9], 21, -343485551)

      a = safe_add(a, olda)
      b = safe_add(b, oldb)
      c = safe_add(c, oldc)
      d = safe_add(d, oldd)
    }
    return [a, b, c, d]
  }
  function binl2hex(binarray) {
    const hex_tab = hexcase ? '0123456789ABCDEF' : '0123456789abcdef'
    let str = ''
    for (let i = 0; i < binarray.length * 4; i++) {
      str +=
        hex_tab.charAt((binarray[i >> 2] >> ((i % 4) * 8 + 4)) & 0xf) +
        hex_tab.charAt((binarray[i >> 2] >> ((i % 4) * 8)) & 0xf)
    }
    return str
  }
  function decode64(input) {
    let output = ''
    let chr1,
      chr2,
      chr3 = ''
    let enc1,
      enc2,
      enc3,
      enc4 = ''
    let i = 0

    if (input.length % 4 != 0) {
      return ''
    }
    const base64test = /[^A-Za-z0-9\\+\\/\\=]/g
    if (base64test.exec(input)) {
      return ''
    }
    do {
      enc1 = keyStr.indexOf(input.charAt(i++))
      enc2 = keyStr.indexOf(input.charAt(i++))
      enc3 = keyStr.indexOf(input.charAt(i++))
      enc4 = keyStr.indexOf(input.charAt(i++))
      chr1 = (enc1 << 2) | (enc2 >> 4)
      chr2 = ((enc2 & 15) << 4) | (enc3 >> 2)
      chr3 = ((enc3 & 3) << 6) | enc4

      output = output + String.fromCharCode(chr1)
      if (enc3 != 64) {
        output += String.fromCharCode(chr2)
      }
      if (enc4 != 64) {
        output += String.fromCharCode(chr3)
      }
      chr1 = chr2 = chr3 = ''
      enc1 = enc2 = enc3 = enc4 = ''
    } while (i < input.length)
    return output
  }
  function encrypt(data, key) {
    //key = "123456789";
    data = native2ascii(data)
    key = hex_md5(key)
    let str = ''
    let char = ''
    key = key.toUpperCase()
    let x = 0
    const len = data.length
    const l = key.length
    for (let i = 0; i < len; i++) {
      if (x == l) {
        x = 0
      }
      char += key.substr(x, 1)
      x++
    }
    for (let i = 0; i < len; i++) {
      str += String.fromCharCode(data[i].charCodeAt() + (char[i].charCodeAt() % 256))
    }
    let k = utf16to8(str)
    k = encode64(k)
    return k
  }
  function decrypt(data, key) {
    key = hex_md5(key)
    key = key.toUpperCase()
    let x = 0
    data = decode64(data)
    data = utf8to16(data)
    let char = ''
    let str = ''
    const len = data.length
    const l = key.length
    for (let i = 0; i < len; i++) {
      if (x == l) {
        x = 0
      }
      char += key.substr(x, 1)
      x++
    }
    for (let i = 0; i < len; i++) {
      if (data.substr(i, 1).charCodeAt() < char.substr(i, 1).charCodeAt()) {
        str += String.fromCharCode(
          data.substr(i, 1).charCodeAt() + 256 - char.substr(i, 1).charCodeAt()
        )
      } else {
        str += String.fromCharCode(data.substr(i, 1).charCodeAt() - char.substr(i, 1).charCodeAt())
      }
    }
    return ascii2native(str)
  }
  function ascii2native(strAscii) {
    let output = ''
    let posFrom = 0
    let posTo = strAscii.indexOf('\\u', posFrom)
    while (posTo >= 0) {
      output += strAscii.substring(posFrom, posTo)
      output += toChar(strAscii.substr(posTo, 6))
      posFrom = posTo + 6
      posTo = strAscii.indexOf('\\u', posFrom)
    }
    output += strAscii.substr(posFrom)
    return output
  }
  function native2ascii(strNative) {
    let output = ''
    for (let i = 0; i < strNative.length; i++) {
      const c = strNative.charAt(i)
      const cc = strNative.charCodeAt(i)
      if (cc > 0xff) output += '\\u' + toHex(cc >> 8) + toHex(cc & 0xff)
      else output += c
    }
    return output
  }
  function toHex(n) {
    const nH = (n >> 4) & 0x0f
    const nL = n & 0x0f
    return hexChars.charAt(nH) + hexChars.charAt(nL)
  }
  const hexChars = '0123456789ABCDEF'
  function toChar(str) {
    if (str.substr(0, 2) != '\\u') return str

    let code = 0
    for (let i = 2; i < str.length; i++) {
      let cc = str.charCodeAt(i)
      if (cc >= 0x30 && cc <= 0x39) cc = cc - 0x30
      else if (cc >= 0x41 && cc <= 0x5a) cc = cc - 0x41 + 10
      else if (cc >= 0x61 && cc <= 0x7a) cc = cc - 0x61 + 10

      code <<= 4
      code += cc
    }

    if (code < 0xff) return str

    return String.fromCharCode(code)
  }
  return {
    encrypt,
    decrypt
  }
}