zhywpt-h5/static/js/util/sm4.js

/**
 * base64js
 * base64js.toByteArray(d.input)
 * base64js.fromByteArray(c);
 * 国密SM4加密算法
 * @email 1216113487@qq.com
 * 原作者：中科软wzk
 * 修改：徐一杰
 * 2021/12/24
 *
 * 调用方法：
 * import {SM4Util} from '@/utils/sm4';
 * var sm4 = new SM4Util();
 sm4.encryptData_CBC('');
 */

(function (r) {
  if (typeof exports === "object" && typeof module !== "undefined") { module.exports = r() } else {
    let define
    if (typeof define ===
      "function" && define.amd) { define([], r) } else {
        var e; if (typeof window !== "undefined") { e = window } else {
          if (typeof global
            !== "undefined") { e = global } else { if (typeof self !== "undefined") { e = self } else { e = this } }
        } e.base64js = r()
    }
  }
})(function () {
  return function r (e, t, n) {
    const f = typeof require == "function" && require

    function o (i, a) {
      if (!t[i]) {
        if (!e[i]) {
          const u = typeof require == "function" && require; if (!a && u) {
            return u(i, !0)
          } if (f) { return f(i, !0) }
          const d = new Error("Cannot find module '" + i + "'"); throw d.code = "MODULE_NOT_FOUND", d
        }
        const c = t[i] = { exports: {} }; e[i][0].call(c.exports, function (r) {
          const t = e[i][1][r]; return o(t ? t : r)
        }, c, c.exports, r, e, t, n)
      } return t[i].exports
    }
    for (let i = 0; i < n.length; i++) { o(n[i]) } return o
  }({
    "/": [function (r, e, t) {
      t.byteLength = c
      t.toByteArray = v; t.fromByteArray = s; var n = []; var o = []; var f = typeof Uint8Array !== "undefined" ? Uint8Array : Array
      const i = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
      let a = 0, u = i.length
      for (; a < u; ++a) {
        n[a] = i[a]
        o[i.charCodeAt(a)] = a
      } o["-".charCodeAt(0)] = 62; o["_".charCodeAt(0)] = 63; function d (r) {
        const e = r.length; if (e % 4 > 0) {
          throw new Error("Invalid string. Length must be a multiple of 4")
        } return r[e - 2] === "=" ? 2 : r[e - 1] === "=" ? 1 : 0
      }
      function c (r) { return r.length * 3 / 4 - d(r) } function v (r) {
        let e, t, n, i, a
        const u = r.length; i = d(r); a = new f(u * 3 / 4 - i); t = i > 0 ? u - 4 : u
        let c = 0; for (e = 0; e < t; e += 4) {
          n = o[r.charCodeAt(e)] << 18 | o[r.charCodeAt(e + 1)] << 12 | o[r.charCodeAt(e + 2)] << 6 | o[r.charCodeAt(e + 3)]
          a[c++] = n >> 16 & 255; a[c++] = n >> 8 & 255; a[c++] = n & 255
        } if (i === 2) { n = o[r.charCodeAt(e)] << 2 | o[r.charCodeAt(e + 1)] >> 4; a[c++] = n & 255 }
        else { if (i === 1) { n = o[r.charCodeAt(e)] << 10 | o[r.charCodeAt(e + 1)] << 4 | o[r.charCodeAt(e + 2)] >> 2; a[c++] = n >> 8 & 255; a[c++] = n & 255 } } return a
      }
      function l (r) { return n[r >> 18 & 63] + n[r >> 12 & 63] + n[r >> 6 & 63] + n[r & 63] } function h (r, e, t) {
        let n
        const o = []; for (let f = e; f < t; f += 3) {
          n = (r[f] << 16) + (r[f + 1] << 8) + r[f + 2]; o.push(l(n))
        } return o.join("")
      } function s (r) {
        let e
        const t = r.length
        const o = t % 3
        let f = ""
        const i = []
        const a = 16383
        let u = 0, d = t - o
        for (; u < d; u += a) { i.push(h(r, u, u + a > d ? d : u + a)) } if (o === 1) { e = r[t - 1]; f += n[e >> 2]; f += n[e << 4 & 63]; f += "==" } else {
          if (o === 2) {
            e = (r[t - 2] << 8) + r[t - 1]; f += n[e >> 10]; f += n[e >> 4 & 63]; f += n[e << 2 & 63]; f += "="
          }
        } i.push(f); return i.join("")
      }
    }, {}]
  }, {}, [])("/")
})

/**
 * 国密SM4加密算法
 * @author wzk
 * @email 1216113487@qq.com
 * @company 中科软
 */
function SM4_Context () {
  this.mode = 1
  this.isPadding = true
  this.sk = new Array(32)
}

function SM4 () {
  this.SM4_ENCRYPT = 1
  this.SM4_DECRYPT = 0

  const SboxTable = [0xd6, 0x90, 0xe9, 0xfe, 0xcc, 0xe1, 0x3d, 0xb7, 0x16, 0xb6, 0x14, 0xc2, 0x28, 0xfb, 0x2c, 0x05,
    0x2b, 0x67, 0x9a, 0x76, 0x2a, 0xbe, 0x04, 0xc3, 0xaa, 0x44, 0x13, 0x26, 0x49, 0x86, 0x06, 0x99,
    0x9c, 0x42, 0x50, 0xf4, 0x91, 0xef, 0x98, 0x7a, 0x33, 0x54, 0x0b, 0x43, 0xed, 0xcf, 0xac, 0x62,
    0xe4, 0xb3, 0x1c, 0xa9, 0xc9, 0x08, 0xe8, 0x95, 0x80, 0xdf, 0x94, 0xfa, 0x75, 0x8f, 0x3f, 0xa6,
    0x47, 0x07, 0xa7, 0xfc, 0xf3, 0x73, 0x17, 0xba, 0x83, 0x59, 0x3c, 0x19, 0xe6, 0x85, 0x4f, 0xa8,
    0x68, 0x6b, 0x81, 0xb2, 0x71, 0x64, 0xda, 0x8b, 0xf8, 0xeb, 0x0f, 0x4b, 0x70, 0x56, 0x9d, 0x35,
    0x1e, 0x24, 0x0e, 0x5e, 0x63, 0x58, 0xd1, 0xa2, 0x25, 0x22, 0x7c, 0x3b, 0x01, 0x21, 0x78, 0x87,
    0xd4, 0x00, 0x46, 0x57, 0x9f, 0xd3, 0x27, 0x52, 0x4c, 0x36, 0x02, 0xe7, 0xa0, 0xc4, 0xc8, 0x9e,
    0xea, 0xbf, 0x8a, 0xd2, 0x40, 0xc7, 0x38, 0xb5, 0xa3, 0xf7, 0xf2, 0xce, 0xf9, 0x61, 0x15, 0xa1,
    0xe0, 0xae, 0x5d, 0xa4, 0x9b, 0x34, 0x1a, 0x55, 0xad, 0x93, 0x32, 0x30, 0xf5, 0x8c, 0xb1, 0xe3,
    0x1d, 0xf6, 0xe2, 0x2e, 0x82, 0x66, 0xca, 0x60, 0xc0, 0x29, 0x23, 0xab, 0x0d, 0x53, 0x4e, 0x6f,
    0xd5, 0xdb, 0x37, 0x45, 0xde, 0xfd, 0x8e, 0x2f, 0x03, 0xff, 0x6a, 0x72, 0x6d, 0x6c, 0x5b, 0x51,
    0x8d, 0x1b, 0xaf, 0x92, 0xbb, 0xdd, 0xbc, 0x7f, 0x11, 0xd9, 0x5c, 0x41, 0x1f, 0x10, 0x5a, 0xd8,
    0x0a, 0xc1, 0x31, 0x88, 0xa5, 0xcd, 0x7b, 0xbd, 0x2d, 0x74, 0xd0, 0x12, 0xb8, 0xe5, 0xb4, 0xb0,
    0x89, 0x69, 0x97, 0x4a, 0x0c, 0x96, 0x77, 0x7e, 0x65, 0xb9, 0xf1, 0x09, 0xc5, 0x6e, 0xc6, 0x84,
    0x18, 0xf0, 0x7d, 0xec, 0x3a, 0xdc, 0x4d, 0x20, 0x79, 0xee, 0x5f, 0x3e, 0xd7, 0xcb, 0x39, 0x48]

  const FK = [0xa3b1bac6, 0x56aa3350, 0x677d9197, 0xb27022dc]

  const CK = [0x00070e15, 0x1c232a31, 0x383f464d, 0x545b6269,
    0x70777e85, 0x8c939aa1, 0xa8afb6bd, 0xc4cbd2d9,
    0xe0e7eef5, 0xfc030a11, 0x181f262d, 0x343b4249,
    0x50575e65, 0x6c737a81, 0x888f969d, 0xa4abb2b9,
    0xc0c7ced5, 0xdce3eaf1, 0xf8ff060d, 0x141b2229,
    0x30373e45, 0x4c535a61, 0x686f767d, 0x848b9299,
    0xa0a7aeb5, 0xbcc3cad1, 0xd8dfe6ed, 0xf4fb0209,
    0x10171e25, 0x2c333a41, 0x484f565d, 0x646b7279]

  this.GET_ULONG_BE = function (b, i) {
    return (b[i] & 0xff) << 24 | ((b[i + 1] & 0xff) << 16) | ((b[i + 2] & 0xff) << 8) | (b[i + 3] & 0xff) & 0xffffffff
  }

  this.PUT_ULONG_BE = function (n, b, i) {
    var t1 = (0xFF & (n >> 24))
    var t2 = (0xFF & (n >> 16))
    var t3 = (0xFF & (n >> 8))
    var t4 = (0xFF & (n))
    b[i] = t1 > 128 ? t1 - 256 : t1
    b[i + 1] = t2 > 128 ? t2 - 256 : t2
    b[i + 2] = t3 > 128 ? t3 - 256 : t3
    b[i + 3] = t4 > 128 ? t4 - 256 : t4
  }

  this.SHL = function (x, n) {
    return (x & 0xFFFFFFFF) << n
  }

  this.ROTL = function (x, n) {
    // const s = this.SHL(x, n);
    // const ss = x >> (32 - n);
    return this.SHL(x, n) | x >> (32 - n)
  }


  this.sm4Lt = function (ka) {
    let bb = 0
    let c = 0
    const a = new Array(4)
    const b = new Array(4)
    this.PUT_ULONG_BE(ka, a, 0)
    b[0] = this.sm4Sbox(a[0])
    b[1] = this.sm4Sbox(a[1])
    b[2] = this.sm4Sbox(a[2])
    b[3] = this.sm4Sbox(a[3])
    bb = this.GET_ULONG_BE(b, 0)
    c = bb ^ this.ROTL(bb, 2) ^ this.ROTL(bb, 10) ^ this.ROTL(bb, 18) ^ this.ROTL(bb, 24)
    return c
  }

  this.sm4F = function (x0, x1, x2, x3, rk) {
    return x0 ^ this.sm4Lt(x1 ^ x2 ^ x3 ^ rk)
  }

  this.sm4CalciRK = function (ka) {
    let bb = 0
    let rk = 0
    const a = new Array(4)
    const b = new Array(4)
    this.PUT_ULONG_BE(ka, a, 0)
    b[0] = this.sm4Sbox(a[0])
    b[1] = this.sm4Sbox(a[1])
    b[2] = this.sm4Sbox(a[2])
    b[3] = this.sm4Sbox(a[3])
    bb = this.GET_ULONG_BE(b, 0)
    rk = bb ^ this.ROTL(bb, 13) ^ this.ROTL(bb, 23)
    return rk
  }



  this.sm4Sbox = function (inch) {
    const i = inch & 0xFF
    const retVal = SboxTable[i]
    return retVal > 128 ? retVal - 256 : retVal
  }

  this.sm4_setkey_enc = function (ctx, key) {
    if (ctx == null) {
      alert("ctx is null!")
      return false
    }
    if (key == null || key.length !== 16) {
      alert("key error!")
      return false
    }
    ctx.mode = this.SM4_ENCRYPT
    this.sm4_setkey(ctx.sk, key)

  }

  //生成解密密钥
  this.sm4_setkey_dec = function (ctx, key) {
    if (ctx == null) {
      Error("ctx is null!")
    }

    if (key == null || key.length !== 16) {
      Error("2key error!")
    }

    // var i = 0;
    ctx.mode = 0
    this.sm4_setkey(ctx.sk, key)
    ctx.sk = ctx.sk.reverse()
  }

  this.sm4_setkey = function (SK, key) {
    const MK = new Array(4)
    const k = new Array(36)
    // var i = 0;
    MK[0] = this.GET_ULONG_BE(key, 0)
    MK[1] = this.GET_ULONG_BE(key, 4)
    MK[2] = this.GET_ULONG_BE(key, 8)
    MK[3] = this.GET_ULONG_BE(key, 12)
    k[0] = MK[0] ^ FK[0]
    k[1] = MK[1] ^ FK[1]
    k[2] = MK[2] ^ FK[2]
    k[3] = MK[3] ^ FK[3]
    for (let i = 0; i < 32; i++) {
      k[(i + 4)] = (k[i] ^ this.sm4CalciRK(k[(i + 1)] ^ k[(i + 2)] ^ k[(i + 3)] ^ CK[i]))
      SK[i] = k[(i + 4)]
    }

  }
  this.padding = function (input, mode) {
    let p
    if (input == null) {
      return null
    }
    let ret = null
    if (mode === this.SM4_ENCRYPT) {
      p = parseInt(16 - input.length % 16)
      ret = input.slice(0)
      for (let i = 0; i < p; i++) {
        ret[input.length + i] = p
      }
    } else {
      p = input[input.length - 1]
      ret = input.slice(0, input.length - p)
    }
    return ret
  }
  this.sm4_one_round = function (sk, input, output) {
    let i = 0
    const ulbuf = new Array(36)
    ulbuf[0] = this.GET_ULONG_BE(input, 0)
    ulbuf[1] = this.GET_ULONG_BE(input, 4)
    ulbuf[2] = this.GET_ULONG_BE(input, 8)
    ulbuf[3] = this.GET_ULONG_BE(input, 12)
    while (i < 32) {
      ulbuf[(i + 4)] = this.sm4F(ulbuf[i], ulbuf[(i + 1)], ulbuf[(i + 2)], ulbuf[(i + 3)], sk[i])
      i++
    }
    this.PUT_ULONG_BE(ulbuf[35], output, 0)
    this.PUT_ULONG_BE(ulbuf[34], output, 4)
    this.PUT_ULONG_BE(ulbuf[33], output, 8)
    this.PUT_ULONG_BE(ulbuf[32], output, 12)

  }



  this.sm4_crypt_ecb = function (ctx, input) {
    if (input == null) {
      alert("input is null!")
    }
    if ((ctx.isPadding) && (ctx.mode == this.SM4_ENCRYPT)) {
      input = this.padding(input, this.SM4_ENCRYPT)
    }

    let i = 0
    let length = input.length
    let bous = []
    for (; length > 0; length -= 16) {
      var out = new Array(16)
      var ins = input.slice(i * 16, (16 * (i + 1)))
      this.sm4_one_round(ctx.sk, ins, out)
      bous = bous.concat(out)
      i++
    }

    let output = bous
    if (ctx.isPadding && ctx.mode === this.SM4_DECRYPT) {
      output = this.padding(output, this.SM4_DECRYPT)
    }
    for (i = 0; i < output.length; i++) {
      if (output[i] < 0) {
        output[i] = output[i] + 256
      }
    }
    return output
  }

  this.sm4_crypt_cbc = function (ctx, iv, input) {
    let out
    let ins
    let out1
    let k
    if (iv == null || iv.length !== 16) {
      alert("iv error!")
    }

    if (input == null) {
      alert("input is null!")
    }

    if (ctx.isPadding && ctx.mode === this.SM4_ENCRYPT) {
      input = this.padding(input, this.SM4_ENCRYPT)
    }

    let i = 0
    let length = input.length
    let bous = []
    if (ctx.mode === this.SM4_ENCRYPT) {
      k = 0
      for (; length > 0; length -= 16) {
        out = new Array(16)
        out1 = new Array(16)
        ins = input.slice(k * 16, (16 * (k + 1)))

        for (i = 0; i < 16; i++) {
          out[i] = (ins[i] ^ iv[i])
        }
        this.sm4_one_round(ctx.sk, out, out1)
        iv = out1.slice(0, 16)
        bous = bous.concat(out1)
        k++
      }
    }
    else {
      let temp = []
      k = 0
      for (; length > 0; length -= 16) {
        out = new Array(16)
        out1 = new Array(16)
        ins = input.slice(k * 16, (16 * (k + 1)))
        temp = ins.slice(0, 16)
        this.sm4_one_round(ctx.sk, ins, out)
        for (i = 0; i < 16; i++) {
          out1[i] = (out[i] ^ iv[i])
        }
        iv = temp.slice(0, 16)
        bous = bous.concat(out1)
        k++
      }
    }

    let output = bous
    if (ctx.isPadding && ctx.mode === this.SM4_DECRYPT) {
      output = this.padding(output, this.SM4_DECRYPT)
    }

    for (i = 0; i < output.length; i++) {
      if (output[i] < 0) {
        output[i] = output[i] + 256
      }
    }
    return output
  }
}


export function SM4Util () {
  // 和后端key一致
  // 当时用CBC模式的时候
  this.iv = "ZkR_SiNoSOFT=568"
  this.hexString = false

  // ECB模式加密
  this.encryptData_ECB = function (plainText) {
    try {
      const sm4 = new SM4()
      const ctx = new SM4_Context()
      ctx.isPadding = true
      ctx.mode = sm4.SM4_ENCRYPT
      const keyBytes = this.stringToByte(this.secretKey)
      sm4.sm4_setkey_enc(ctx, keyBytes)
      const encrypted = sm4.sm4_crypt_ecb(ctx, this.stringToByte(plainText))
      const cipherText = base64js.fromByteArray(encrypted)
      if (cipherText != null && cipherText.trim().length > 0) {
        cipherText.replace(/(\s*|\t|\r|\n)/g, "")
      }
      return cipherText
    } catch (e) {
      console.error(e)
      return null
    }
  }
  //解密_ECB
  this.decryptData_ECB = function (cipherText) {
    try {
      let sm4 = new SM4()
      let ctx = new SM4_Context()
      ctx.isPadding = true
      ctx.mode = sm4.SM4_ENCRYPT
      let keyBytes = this.stringToByte(this.secretKey)
      sm4.sm4_setkey_dec(ctx, keyBytes)
      let decrypted = sm4.sm4_crypt_ecb(ctx, base64js.toByteArray(cipherText))
      return utf8ByteToUnicodeStr(decrypted)
    } catch (e) {
      console.error(e)
      return null
    }
  }

  // CBC模式加密
  this.encryptData_CBC = function (plainText,secretKey) {
    try {
      plainText = JSON.stringify(plainText)
      const sm4 = new SM4()
      const ctx = new SM4_Context()
      ctx.isPadding = true
      ctx.mode = sm4.SM4_ENCRYPT

      const keyBytes = this.stringToByte(secretKey.substring(0,16))
      const ivBytes = this.stringToByte(this.iv)

      sm4.sm4_setkey_enc(ctx, keyBytes)
      const encrypted = sm4.sm4_crypt_cbc(ctx, ivBytes, this.stringToByte(plainText))
      const cipherText = base64js.fromByteArray(encrypted)
      if (cipherText != null && cipherText.trim().length > 0) {
        cipherText.replace(/(\s*|\t|\r|\n)/g, "")
      }
      return cipherText
    }
    catch (e) {
      console.error(e)
      return null
    }
  }
  //解密_CBC
  this.decryptData_CBC = function (cipherText,secretKey) {
    try {
      let sm4 = new SM4()
      let ctx = new SM4_Context()
      ctx.isPadding = true
      ctx.mode = sm4.SM4_ENCRYPT
      let keyBytes = this.stringToByte(secretKey.substring(0,16))
      let ivBytes = this.stringToByte(this.iv)
      sm4.sm4_setkey_dec(ctx, keyBytes)
      let decrypted = sm4.sm4_crypt_cbc(ctx, ivBytes, base64js.toByteArray(cipherText.data.bizContent))
      let bizContent = utf8ByteToUnicodeStr(decrypted)
      // let begin = bizContent.indexOf('{');
      // let end = bizContent.lastIndexOf('}');
      // cipherText.data.bizContent = bizContent.substring(begin,end+1)
	  cipherText.data.bizContent = bizContent;
      return cipherText
    } catch (e) {
      console.error(e)
      return null
    }
  }

  this.stringToByte = function (str) {
    const bytes = []
    let len, c
    len = str.length
    for (let i = 0; i < len; i++) {
      c = str.charCodeAt(i)
      if (c >= 0x010000 && c <= 0x10FFFF) {
        bytes.push(((c >> 18) & 0x07) | 0xF0)
        bytes.push(((c >> 12) & 0x3F) | 0x80)
        bytes.push(((c >> 6) & 0x3F) | 0x80)
        bytes.push((c & 0x3F) | 0x80)
      } else if (c >= 0x000800 && c <= 0x00FFFF) {
        bytes.push(((c >> 12) & 0x0F) | 0xE0)
        bytes.push(((c >> 6) & 0x3F) | 0x80)
        bytes.push((c & 0x3F) | 0x80)
      } else if (c >= 0x000080 && c <= 0x0007FF) {
        bytes.push(((c >> 6) & 0x1F) | 0xC0)
        bytes.push((c & 0x3F) | 0x80)
      } else {
        bytes.push(c & 0xFF)
      }
    }
    return bytes
  }


  this.byteToString = function (arr) {
    if (typeof arr === 'string') {
      return arr
    }
    let str = '',
      _arr = arr
    for (let i = 0; i < _arr.length; i++) {
      const one = _arr[i].toString(2),
        v = one.match(/^1+?(?=0)/)
      if (v && one.length === 8) {
        const bytesLength = v[0].length
        let store = _arr[i].toString(2).slice(7 - bytesLength)
        for (let st = 1; st < bytesLength; st++) {
          store += _arr[st + i].toString(2).slice(2)
        }
        str += String.fromCharCode(parseInt(store, 2))
        i += bytesLength - 1
      } else {
        str += String.fromCharCode(_arr[i])
      }
    }
    return str
  }

  function utf8ByteToUnicodeStr (utf8Bytes) {
    var unicodeStr = ""
    for (var pos = 0; pos < utf8Bytes.length;) {
      var flag = utf8Bytes[pos]
      var unicode = 0
      if ((flag >>> 7) === 0) {
        unicodeStr += String.fromCharCode(utf8Bytes[pos])
        pos += 1

      } else if ((flag & 0xFC) === 0xFC) {
        unicode = (utf8Bytes[pos] & 0x3) << 30
        unicode |= (utf8Bytes[pos + 1] & 0x3F) << 24
        unicode |= (utf8Bytes[pos + 2] & 0x3F) << 18
        unicode |= (utf8Bytes[pos + 3] & 0x3F) << 12
        unicode |= (utf8Bytes[pos + 4] & 0x3F) << 6
        unicode |= (utf8Bytes[pos + 5] & 0x3F)
        unicodeStr += String.fromCharCode(unicode)
        pos += 6

      } else if ((flag & 0xF8) === 0xF8) {
        unicode = (utf8Bytes[pos] & 0x7) << 24
        unicode |= (utf8Bytes[pos + 1] & 0x3F) << 18
        unicode |= (utf8Bytes[pos + 2] & 0x3F) << 12
        unicode |= (utf8Bytes[pos + 3] & 0x3F) << 6
        unicode |= (utf8Bytes[pos + 4] & 0x3F)
        unicodeStr += String.fromCharCode(unicode)
        pos += 5

      } else if ((flag & 0xF0) === 0xF0) {
        unicode = (utf8Bytes[pos] & 0xF) << 18
        unicode |= (utf8Bytes[pos + 1] & 0x3F) << 12
        unicode |= (utf8Bytes[pos + 2] & 0x3F) << 6
        unicode |= (utf8Bytes[pos + 3] & 0x3F)
        unicodeStr += String.fromCharCode(unicode)
        pos += 4

      } else if ((flag & 0xE0) === 0xE0) {
        unicode = (utf8Bytes[pos] & 0x1F) << 12;;
        unicode |= (utf8Bytes[pos + 1] & 0x3F) << 6
        unicode |= (utf8Bytes[pos + 2] & 0x3F)
        unicodeStr += String.fromCharCode(unicode)
        pos += 3

      } else if ((flag & 0xC0) === 0xC0) { //110
        unicode = (utf8Bytes[pos] & 0x3F) << 6
        unicode |= (utf8Bytes[pos + 1] & 0x3F)
        unicodeStr += String.fromCharCode(unicode)
        pos += 2

      } else {
        unicodeStr += String.fromCharCode(utf8Bytes[pos])
        pos += 1
      }
    }
    return unicodeStr
  }
}