前端使用国密SM4进行加密、解密

需求

前端/后端使用 国密SM4 进行加密/解密，
【注意】前后端配合加解密时，需要我们自定义密钥 ，一般由后端提供

【方法1】 - 使用 sm4util 依赖

1. 下载 sm4util 依赖

   npm install sm4util
   

2. sm4util 依赖使用说明
   

3. 使用 - ECB 模式加解密

   /**** 【1】导入依赖 ****/ 
   import { SM4Util } from 'sm4util'
   
   /**** 【2】使用（在改依赖中有使用说明） ****/
   // 1.使用默认密钥进行加密/解密
   var sm4 = new SM4Util()
   const miStr1 = sm4.encryptDefault_ECB('123') // sm4.encryptDefault_ECB(需要加密的字符串)
   console.log('miStr1----', miStr1)
   const jieStr1 = sm4.decryptDefault_ECB(miStr1) // sm4.decryptDefault_ECB(将字符串进行加密后生成的字符串)
   console.log('jieStr1----', jieStr1) // 123
   
   // 2.使用自定义密钥进行加密/解密（【注意】使用自定义密钥进行加密时，后端解密需要用相同的密钥进行解密 - 此处密钥可能不对）
   // var sm4 = new SM4Util()
   const miStr2 = sm4.encryptCustom_ECB('123', '93F3044B07393417A737E2***389D01AF') // 加密  sm4.encryptCustom_ECB(需要加密的字符串, 密钥)
   console.log('miStr2----', miStr2)
   const jieStr2 = sm4.decryptCustom_ECB(miStr2, '93F3044B07393417A737E2***389D01AF') // 解密  sm4.decryptCustom_ECB(将字符串进行加密后生成的字符串, 密钥)
   console.log('jieStr2----', jieStr2) // 123
   

后端代码参考：https://blog.csdn.***/qq_48922459/article/details/122130283

【方法2】sm4.js引入

这种办法好像只能使用默认密钥 key，不能自定义 key 我使用的自定义 key 会报错 "key error" （也有可能是我的 密钥不对）
我使用自定义密钥 - 得改sm4.js 代码，详见 SM4Util 函数 定义处被注释的代码

1. /public/sm4.js

/**
 * base64js
 * base64js.toByteArray(d.input)
 * base64js.fromByteArray(c);
 * 国密SM4加密算法
 */
;(function (r) {
  if (typeof exports === 'object' && typeof module !== 'undefined') {
    module.exports = r()
  } else {
    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 () {
  var r, e, t
  return (function r(e, t, n) {
    function o(i, a) {
      if (!t[i]) {
        if (!e[i]) {
          var u = typeof require == 'function' && require
          if (!a && u) {
            return u(i, !0)
          }
          if (f) {
            return f(i, !0)
          }
          var d = new Error("Cannot find module '" + i + "'")
          throw ((d.code = 'MODULE_NOT_FOUND'), d)
        }
        var c = (t[i] = { exports: {} })
        e[i][0].call(
          c.exports,
          function (r) {
            var t = e[i][1][r]
            return o(t ? t : r)
          },
          c,
          c.exports,
          r,
          e,
          t,
          n
        )
      }
      return t[i].exports
    }
    var f = typeof require == 'function' && require
    for (var 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
          var i = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'
          for (var a = 0, u = i.length; a < u; ++a) {
            n[a] = i[a]
            o[i.charCodeAt(a)] = a
          }
          o['-'.charCodeAt(0)] = 62
          o['_'.charCodeAt(0)] = 63
          function d(r) {
            var 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) {
            var e, t, n, i, a
            var u = r.length
            i = d(r)
            a = new f((u * 3) / 4 - i)
            t = i > 0 ? u - 4 : u
            var 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) {
            var n
            var o = []
            for (var 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) {
            var e
            var t = r.length
            var o = t % 3
            var f = ''
            var i = []
            var a = 16383
            for (var u = 0, d = t - o; 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.***
 * @***pany 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

  var SboxTable = [
    0xd6, 0x90, 0xe9, 0xfe, 0x***, 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
  ]

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

  var 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, 0xb***3cad1, 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) {
    var s = this.SHL(x, n)
    var ss = x >> (32 - n)
    return this.SHL(x, n) | (x >> (32 - n))
  }

  this.sm4Lt = function (ka) {
    var bb = 0
    var c = 0
    var a = new Array(4)
    var 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) {
    var bb = 0
    var rk = 0
    var a = new Array(4)
    var 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) {
    var i = inch & 0xff
    var 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
    }
    console.log('key----', key)
    if (key == null || key.length != 16) {
      alert('key error!')
      return false
    }
    ctx.mode = this.SM4_ENCRYPT
    this.sm4_setkey(ctx.sk, key)
  }

  this.sm4_setkey = function (SK, key) {
    var MK = new Array(4)
    var 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 (var 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) {
    if (input == null) {
      return null
    }
    var ret = null
    if (mode == this.SM4_ENCRYPT) {
      var p = parseInt(16 - (input.length % 16))
      ret = input.slice(0)
      for (var i = 0; i < p; i++) {
        ret[input.length + i] = p
      }
    } else {
      var p = input[input.length - 1]
      ret = input.slice(0, input.length - p)
    }
    return ret
  }
  this.sm4_one_round = function (sk, input, output) {
    var i = 0
    var 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)
    }

    var i = 0
    var length = input.length
    var bous = new Array()
    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++
    }

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

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

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

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

// function SM4Util(key = '1111111111111111') {
function SM4Util() {
  console.log('SM4Util key----', key)
  // 和后端key一致（key为密钥）
  // this.secretKey = key
  this.secretKey = '1111111111111111'
  // 当时用CBC模式的时候
  this.iv = '1111111111111111'
  this.hexString = false

  // ECB模式加密
  this.encryptData_ECB = function (plainText) {
    try {
      var sm4 = new SM4()
      var ctx = new SM4_Context()
      ctx.isPadding = true
      ctx.mode = sm4.SM4_ENCRYPT
      var keyBytes = stringToByte(this.secretKey)
      sm4.sm4_setkey_enc(ctx, keyBytes)
      var encrypted = sm4.sm4_crypt_ecb(ctx, stringToByte(plainText))
      var 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
    }
  }
  // CBC模式加密
  this.encryptData_CBC = function (plainText) {
    try {
      var sm4 = new SM4()
      var ctx = new SM4_Context()
      ctx.isPadding = true
      ctx.mode = sm4.SM4_ENCRYPT

      var keyBytes = stringToByte(this.secretKey)
      var ivBytes = stringToByte(this.iv)

      sm4.sm4_setkey_enc(ctx, keyBytes)
      var encrypted = sm4.sm4_crypt_cbc(ctx, ivBytes, stringToByte(plainText))
      var 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
    }
  }

  stringToByte = function (str) {
    var bytes = new Array()
    var len, c
    len = str.length
    for (var 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)
      }
    }
    console.log('bytes----', bytes)
    return bytes
  }

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

2. body 标签上引入该文件

<script src="/sm4.js"></script>
<body></body>

3. 使用 - ECB 模式加密

// 加密 - 使用默认秘钥 1111111111111111
var sm4 = new SM4Util();
sm4.encryptData_ECB('123');  
// 加密 - 使用自定义秘钥 93F3044B07393417A737E2***389D01AF （需将 sm4.js 文件中SM4Util 函数处注释的代码打开）
var sm4 = new SM4Util('93F3044B07393417A737E2***389D01AF');
sm4.encryptData_ECB('123');  // 后端解密的好像对不上，

该加密办法参考博客 https://blog.csdn.***/wzk_blog/article/details/122668114

【方法3】

1. 本地写 js 文件

@/utils/SM4Util/index.js

let base64js = require('./base64js')
let Hex = require('./hex')
let SM4 = require('./sm4')

function SM4Util() {}

/**
 * sm4 ecb 加密
 * @param utf8Str
 * @param utf8Key
 */
SM4Util.sm4ECBEncrypt = function (utf8Str, utf8Key) {
  if (!utf8Key) {
    utf8Key = 'zzfh!@#$QazxWsxc'
  }
  let sm4 = new SM4()
  let keyBytes = Hex.utf8StrToBytes(utf8Key)
  let contentBytes = Hex.utf8StrToBytes(utf8Str)
  let cipher = sm4.encrypt_ecb(keyBytes, contentBytes)
  return base64js.fromByteArray(cipher)
}

/**
 * sm4 ecb 解密
 * @param utf8Str
 * @param utf8Key
 */
SM4Util.sm4ECBDecrypt = function (base64Str, utf8Key) {
  if (!utf8Key) {
    utf8Key = 'zzfh!@#$QazxWsxc'
  }
  let sm4 = new SM4()
  let keyBytes = Hex.utf8StrToBytes(utf8Key)
  let contentBytes = base64js.toByteArray(base64Str)
  let plain = sm4.decrypt_ecb(keyBytes, contentBytes)
  return Hex.bytesToUtf8Str(plain)
}

/**
 * sm4 cbc 加密
 * @param utf8Str
 * @param utf8Key
 * @param utf8Iv
 */
SM4Util.sm4CBCEncrypt = function (utf8Str, utf8Key, utf8Iv) {
  if (!utf8Key) {
    utf8Key = 'cmbtest1cmbtest1'
  }
  if (!utf8Iv) {
    utf8Iv = 'cmbtest1cmbtest1'
  }
  let sm4 = new SM4()
  let keyBytes = Hex.utf8StrToBytes(utf8Key)
  let ivBytes = Hex.utf8StrToBytes(utf8Iv)
  let contentBytes = Hex.utf8StrToBytes(utf8Str)
  let cipher = sm4.encrypt_cbc(keyBytes, ivBytes, contentBytes)
  return base64js.fromByteArray(cipher)
}

/**
 * sm4 cbc 解密
 * @param utf8Str
 * @param utf8Key
 * @param utf8Iv
 */
SM4Util.sm4CBCDecrypt = function (base64Str, utf8Key, utf8Iv) {
  if (!utf8Key) {
    utf8Key = 'cmbtest1cmbtest1'
  }
  if (!utf8Iv) {
    utf8Iv = 'cmbtest1cmbtest1'
  }
  let sm4 = new SM4()
  let keyBytes = Hex.utf8StrToBytes(utf8Key)
  let ivBytes = Hex.utf8StrToBytes(utf8Iv)
  let contentBytes = base64js.toByteArray(base64Str)
  let plain = sm4.decrypt_cbc(keyBytes, ivBytes, contentBytes)
  return Hex.bytesToUtf8Str(plain)
}

module.exports = SM4Util

@/utils/SM4Util/base64js.js

/**
 * base64js
 * base64js.toByteArray(utf8Str)
 * base64js.fromByteArray(bytes);
 */
;(function (r) {
  if (typeof exports === 'object' && typeof module !== 'undefined') {
    module.exports = r()
  } else {
    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 () {
  var r, e, t
  return (function r(e, t, n) {
    function o(i, a) {
      if (!t[i]) {
        if (!e[i]) {
          var u = typeof require == 'function' && require
          if (!a && u) {
            return u(i, !0)
          }
          if (f) {
            return f(i, !0)
          }
          var d = new Error("Cannot find module '" + i + "'")
          throw ((d.code = 'MODULE_NOT_FOUND'), d)
        }
        var c = (t[i] = {
          exports: {}
        })
        e[i][0].call(
          c.exports,
          function (r) {
            var t = e[i][1][r]
            return o(t ? t : r)
          },
          c,
          c.exports,
          r,
          e,
          t,
          n
        )
      }
      return t[i].exports
    }
    var f = typeof require == 'function' && require
    for (var 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
          var i = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'
          for (var a = 0, u = i.length; a < u; ++a) {
            n[a] = i[a]
            o[i.charCodeAt(a)] = a
          }
          o['-'.charCodeAt(0)] = 62
          o['_'.charCodeAt(0)] = 63

          function d(r) {
            var 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) {
            var e, t, n, i, a
            var u = r.length
            i = d(r)
            a = new f((u * 3) / 4 - i)
            t = i > 0 ? u - 4 : u
            var 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) {
            var n
            var o = []
            for (var 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) {
            var e
            var t = r.length
            var o = t % 3
            var f = ''
            var i = []
            var a = 16383
            for (var u = 0, d = t - o; 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('')
          }
        },
        {}
      ]
    },
    {},
    []
  )('/')
})

@/utils/SM4Util/hex.js

function Hex() {}

/**
 * 数组转为16进制字符串
 * @param b  数组
 * @param pos  指定位置
 * @param len  长度
 * @returns {string}
 */
Hex.encode = function (b, pos, len) {
  var hexCh = new Array(len * 2)
  var hexCode = new Array('0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F')

  for (var i = pos, j = 0; i < len + pos; i++, j++) {
    hexCh[j] = hexCode[(b[i] & 0xff) >> 4]
    hexCh[++j] = hexCode[b[i] & 0x0f]
  }

  return hexCh.join('')
}
/**
 * 16进制字符串转为字节数组
 * @param hex
 * @returns {any[]|null}
 */
Hex.decode = function (hex) {
  if (hex == null || hex == '') {
    return null
  }
  if (hex.length % 2 != 0) {
    return null
  }

  var ascLen = hex.length / 2
  var hexCh = this.toCharCodeArray(hex)
  var asc = new Array(ascLen)

  for (var i = 0; i < ascLen; i++) {
    if (hexCh[2 * i] >= 0x30 && hexCh[2 * i] <= 0x39) {
      asc[i] = (hexCh[2 * i] - 0x30) << 4
    } else if (hexCh[2 * i] >= 0x41 && hexCh[2 * i] <= 0x46) {
      //A-F : 0x41-0x46
      asc[i] = (hexCh[2 * i] - 0x41 + 10) << 4
    } else if (hexCh[2 * i] >= 0x61 && hexCh[2 * i] <= 0x66) {
      //a-f  : 0x61-0x66
      asc[i] = (hexCh[2 * i] - 0x61 + 10) << 4
    } else {
      return null
    }

    if (hexCh[2 * i + 1] >= 0x30 && hexCh[2 * i + 1] <= 0x39) {
      asc[i] = asc[i] | (hexCh[2 * i + 1] - 0x30)
    } else if (hexCh[2 * i + 1] >= 0x41 && hexCh[2 * i + 1] <= 0x46) {
      asc[i] = asc[i] | (hexCh[2 * i + 1] - 0x41 + 10)
    } else if (hexCh[2 * i + 1] >= 0x61 && hexCh[2 * i + 1] <= 0x66) {
      asc[i] = asc[i] | (hexCh[2 * i + 1] - 0x61 + 10)
    } else {
      return null
    }
  }
  return asc
}

/**
 * utf8字符串转为字节数组
 * @param utf8Str
 * @returns {[]}
 */
Hex.utf8StrToBytes = function (utf8Str) {
  var ens = encodeURI***ponent(utf8Str)
  var es = unescape(ens)
  var esLen = es.length
  // Convert
  var words = []
  for (var i = 0; i < esLen; i++) {
    words[i] = es.charCodeAt(i)
  }
  return words
}
/**
 * 字节数组转为utf8字符串
 * @param bytesArray
 * @returns {string}
 */
Hex.bytesToUtf8Str = function (bytesArray) {
  var utf8Byte = bytesArray
  var latin1Chars = []
  for (var i = 0; i < utf8Byte.length; i++) {
    latin1Chars.push(String.fromCharCode(utf8Byte[i]))
  }
  return decodeURI***ponent(escape(latin1Chars.join('')))
}

/**
 * 16进制字符串转为utf8字符串
 * @param utf8Str
 * @returns {string}
 */
Hex.hexToUtf8Str = function (utf8Str) {
  var utf8Byte = Hex.decode(utf8Str)
  var latin1Chars = []
  for (var i = 0; i < utf8Byte.length; i++) {
    latin1Chars.push(String.fromCharCode(utf8Byte[i]))
  }
  return decodeURI***ponent(escape(latin1Chars.join('')))
}

/**
 * utf8字符串转为16进制字符串
 * @param utf8Str
 * @returns {string}
 */
Hex.utf8StrToHex = function (utf8Str) {
  var ens = encodeURI***ponent(utf8Str)
  var es = unescape(ens)
  var esLen = es.length

  // Convert
  var words = []
  for (var i = 0; i < esLen; i++) {
    words[i] = es.charCodeAt(i).toString(16)
  }
  return words.join('')
}

/**
 * 字符串中每个字符转为数组中每个元素，数字，字母同Hex.utf8StrToBytes()方法
 * @param chs
 * @returns {any[]}
 */
Hex.toCharCodeArray = function (chs) {
  var chArr = new Array(chs.length)
  for (var i = 0; i < chs.length; i++) {
    chArr[i] = chs.charCodeAt(i)
  }
  return chArr
}

module.exports = Hex

@/utils/SM4Util/sm4.js

/*
 * sm4-1.0.js
 *
 * Copyright (c) 2019 RuXing Liang
 */
/**
 * @name sm4-1.0.js
 * @author RuXing Liang
 * @version 1.0.0 (2019-04-19)
 */
function SM4() {
  this.sbox = new Array(
    0xd6,
    0x90,
    0xe9,
    0xfe,
    0x***,
    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
  )

  this.fk = new Array(0xa3b1bac6, 0x56aa3350, 0x677d9197, 0xb27022dc)
  this.ck = new Array(
    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,
    0xb***3cad1,
    0xd8dfe6ed,
    0xf4fb0209,
    0x10171e25,
    0x2c333a41,
    0x484f565d,
    0x646b7279
  )
}

SM4.prototype = {
  expandKey: function (key) {
    var k = new Array(36)
    var mk = byteArrayToIntArray(key)
    k[0] = mk[0] ^ this.fk[0]
    k[1] = mk[1] ^ this.fk[1]
    k[2] = mk[2] ^ this.fk[2]
    k[3] = mk[3] ^ this.fk[3]
    var rk = new Array(32)
    for (var i = 0; i < 32; i++) {
      k[i + 4] = k[i] ^ this.T1(k[i + 1] ^ k[i + 2] ^ k[i + 3] ^ this.ck[i])
      rk[i] = k[i + 4]
    }
    return rk
  },
  T1: function (ta) {
    var rk = 0
    var b = new Array(4)
    var a = intToByte(ta)
    b[0] = this.sbox[a[0] & 0xff]
    b[1] = this.sbox[a[1] & 0xff]
    b[2] = this.sbox[a[2] & 0xff]
    b[3] = this.sbox[a[3] & 0xff]
    var bint = byteToInt(b, 0)
    var rk = bint ^ ((bint << 13) | (bint >>> (32 - 13))) ^ ((bint << 23) | (bint >>> (32 - 23)))
    return rk
  },
  one_encrypt: function (rk, data) {
    var x = new Array(36)
    x[0] = byteToInt(data, 0)
    x[1] = byteToInt(data, 4)
    x[2] = byteToInt(data, 8)
    x[3] = byteToInt(data, 12)
    for (var i = 0; i < 32; i++) {
      x[i + 4] = x[i] ^ this.T0(x[i + 1] ^ x[i + 2] ^ x[i + 3] ^ rk[i])
    }
    var tmpx = new Array(4)
    for (var i = 35; i >= 32; i--) {
      tmpx[35 - i] = x[i]
    }
    var xbyte = intArrayToByteArray(tmpx)

    return xbyte
  },
  T0: function (ta) {
    var a = intToByte(ta)
    var b = new Array(4)
    b[0] = this.sbox[a[0] & 0xff]
    b[1] = this.sbox[a[1] & 0xff]
    b[2] = this.sbox[a[2] & 0xff]
    b[3] = this.sbox[a[3] & 0xff]
    var bint = byteToInt(b, 0)
    var c =
      bint ^
      ((bint << 2) | (bint >>> (32 - 2))) ^
      ((bint << 10) | (bint >>> (32 - 10))) ^
      ((bint << 18) | (bint >>> (32 - 18))) ^
      ((bint << 24) | (bint >>> (32 - 24)))
    return c
  },
  pkcs7padding: function (input, mode) {
    if (input == null) {
      return null
    }

    var ret = null
    if (mode == 1) {
      //填充
      var p = 16 - (input.length % 16)
      ret = new Array(input.length + p)
      arrayCopy(input, 0, ret, 0, input.length)
      for (var i = 0; i < p; i++) {
        ret[input.length + i] = p
      }
    } //去除填充
    else {
      var p = input[input.length - 1]
      ret = new Array(input.length - p)
      arrayCopy(input, 0, ret, 0, input.length - p)
    }
    return ret
  },
  /**
   *
   * @param key 字节数组
   * @param data 字节数组
   * @returns {any[]|null}
   */
  encrypt_ecb: function (key, data) {
    if (key == undefined || key == null || key.length % 16 != 0) {
      console.log('sm4 key is error!')
      return null
    }
    if (data == undefined || data == null || data.length <= 0) {
      console.log('data is error!')
      return null
    }
    var rk = this.expandKey(key)
    /*if(debug){
          var rkb = intArrayToByteArray(rk);
          console.log(Hex.encode(rkb,0,rkb.length));
      }*/

    var blockLen = 16
    var loop = parseInt(data.length / blockLen) //注意不能整除会有小数，要取整
    var cipher = new Array((loop + 1) * blockLen)
    var tmp = new Array(blockLen)
    var oneCipher = null

    for (var i = 0; i < loop; i++) {
      arrayCopy(data, i * blockLen, tmp, 0, blockLen)
      oneCipher = this.one_encrypt(rk, tmp)
      arrayCopy(oneCipher, 0, cipher, i * blockLen, blockLen)
    }

    var lessData = new Array(data.length % blockLen)
    if (lessData.length > 0) {
      arrayCopy(data, loop * blockLen, lessData, 0, data.length % blockLen)
    }
    var padding = this.pkcs7padding(lessData, 1)
    oneCipher = this.one_encrypt(rk, padding)
    arrayCopy(oneCipher, 0, cipher, loop * blockLen, blockLen)

    return cipher
  },
  /**
   *
   * @param key  字节数组
   * @param data  字节数组
   * @returns {any[]|null}
   */
  decrypt_ecb: function (key, data) {
    if (key == undefined || key == null || key.length % 16 != 0) {
      console.log('sm4 key is error!')
      return null
    }
    if (data == undefined || data == null || data.length % 16 != 0) {
      console.log('data is error!')
      return null
    }
    var rk = this.expandKey(key)
    var nrk = new Array(32)
    for (var i = 0; i < rk.length; i++) {
      nrk[i] = rk[32 - i - 1]
    }
    var blockLen = 16
    var loop = data.length / blockLen - 1
    var tmp = new Array(blockLen)
    var onePlain = null
    var plain = null
    //先解密最后一部分，确定数据长度
    arrayCopy(data, loop * blockLen, tmp, 0, blockLen)
    onePlain = this.one_encrypt(nrk, tmp)
    var lastPart = this.pkcs7padding(onePlain, 0)

    plain = new Array(loop * blockLen + lastPart.length)
    arrayCopy(lastPart, 0, plain, loop * blockLen, lastPart.length)

    //解密剩下部分数据
    for (var i = 0; i < loop; i++) {
      arrayCopy(data, i * blockLen, tmp, 0, blockLen)
      onePlain = this.one_encrypt(nrk, tmp)
      arrayCopy(onePlain, 0, plain, i * blockLen, blockLen)
    }

    return plain
  },
  encrypt_cbc: function (key, iv, data) {
    if (key == undefined || key == null || key.length % 16 != 0) {
      console.log('sm4 key is error!')
      return null
    }
    if (data == undefined || data == null || data.length <= 0) {
      console.log('data is error!')
      return null
    }
    if (iv == undefined || iv == null || iv.length % 16 != 0) {
      console.log('iv is error!')
      return null
    }
    var rk = this.expandKey(key)

    var blockLen = 16
    var loop = parseInt(data.length / blockLen) //注意不能整除会有小数，要取整
    var cipher = new Array((loop + 1) * blockLen)
    var tmp = new Array(blockLen)
    var oneCipher = null

    for (var i = 0; i < loop; i++) {
      arrayCopy(data, i * blockLen, tmp, 0, blockLen)
      for (var j = 0; j < blockLen; j++) {
        tmp[j] = tmp[j] ^ iv[j]
      }
      iv = this.one_encrypt(rk, tmp)
      arrayCopy(iv, 0, cipher, i * blockLen, blockLen)
    }

    var lessData = new Array(data.length % blockLen)
    if (lessData.length > 0) {
      arrayCopy(data, loop * blockLen, lessData, 0, data.length % blockLen)
    }
    var padding = this.pkcs7padding(lessData, 1)
    for (var i = 0; i < blockLen; i++) {
      padding[i] = padding[i] ^ iv[i]
    }
    iv = this.one_encrypt(rk, padding)
    arrayCopy(iv, 0, cipher, loop * blockLen, blockLen)

    return cipher
  },
  decrypt_cbc: function (key, iv, data) {
    if (key == undefined || key == null || key.length % 16 != 0) {
      console.log('sm4 key is error!')
      return null
    }
    if (data == undefined || data == null || data.length % 16 != 0) {
      console.log('data is error!')
      return null
    }
    if (iv == undefined || iv == null || iv.length % 16 != 0) {
      console.log('iv is error!')
      return null
    }
    var rk = this.expandKey(key)
    var nrk = new Array(32)
    for (var i = 0; i < rk.length; i++) {
      nrk[i] = rk[32 - i - 1]
    }
    var blockLen = 16
    var loop = data.length / blockLen
    var tmp = new Array(blockLen)
    var onePlain = null
    var plain = null

    //解密
    plain = new Array(data.length)
    for (var i = 0; i < loop; i++) {
      arrayCopy(data, i * blockLen, tmp, 0, blockLen)
      onePlain = this.one_encrypt(nrk, tmp)
      for (var j = 0; j < blockLen; j++) {
        onePlain[j] = onePlain[j] ^ iv[j]
      }
      arrayCopy(tmp, 0, iv, 0, blockLen)
      arrayCopy(onePlain, 0, plain, i * blockLen, blockLen)
    }

    //去填充，确定数据长度
    //arrayCopy(data,data.length-blockLen,tmp,0,blockLen);
    var lastPart = this.pkcs7padding(onePlain, 0)

    var realPlain = new Array(plain.length - blockLen + lastPart.length)
    arrayCopy(plain, 0, realPlain, 0, plain.length - blockLen)
    arrayCopy(lastPart, 0, realPlain, plain.length - blockLen, lastPart.length)
    return realPlain
  }
}

///工具类/
/*
 * 数组复制
 */
function arrayCopy(src, pos1, dest, pos2, len) {
  var realLen = len
  if (pos1 + len > src.length && pos2 + len <= dest.length) {
    realLen = src.length - pos1
  } else if (pos2 + len > dest.length && pos1 + len <= src.length) {
    realLen = dest.length - pos2
  } else if (pos1 + len <= src.length && pos2 + len <= dest.length) {
    realLen = len
  } else if (dest.length < src.length) {
    realLen = dest.length - pos2
  } else {
    realLen = src.length - pos2
  }

  for (var i = 0; i < realLen; i++) {
    dest[i + pos2] = src[i + pos1]
  }
}

/*
 * 长整型转成字节，一个长整型为8字节
 * 返回：字节数组
 */
function longToByte(num) {
  //TODO 这里目前只转换了低四字节，因为js没有长整型，得要封装
  return new Array(
    0,
    0,
    0,
    0,
    (num >> 24) & 0x000000ff,
    (num >> 16) & 0x000000ff,
    (num >> 8) & 0x000000ff,
    num & 0x000000ff
  )
}

/*
 * int数转成byte数组
 * 事实上只不过转成byte大小的数，实际占用空间还是4字节
 * 返回：字节数组
 */
function intToByte(num) {
  return new Array((num >> 24) & 0x000000ff, (num >> 16) & 0x000000ff, (num >> 8) & 0x000000ff, num & 0x000000ff)
}

/*
 * int数组转成byte数组，一个int数值转成四个byte
 * 返回:byte数组
 */
function intArrayToByteArray(nums) {
  var b = new Array(nums.length * 4)

  for (var i = 0; i < nums.length; i++) {
    arrayCopy(intToByte(nums[i]), 0, b, i * 4, 4)
  }

  return b
}

/*
 * byte数组转成int数值
 * 返回：int数值
 */
function byteToInt(b, pos) {
  if (pos + 3 < b.length) {
    return (b[pos] << 24) | (b[pos + 1] << 16) | (b[pos + 2] << 8) | b[pos + 3]
  } else if (pos + 2 < b.length) {
    return (b[pos + 1] << 16) | (b[pos + 2] << 8) | b[pos + 3]
  } else if (pos + 1 < b.length) {
    return (b[pos] << 8) | b[pos + 1]
  } else {
    return b[pos]
  }
}

/*
 * byte数组转成int数组,每四个字节转成一个int数值
 *
 */
function byteArrayToIntArray(b) {
  // var arrLen = b.length%4==0 ? b.length/4:b.length/4+1;
  var arrLen = Math.ceil(b.length / 4) //向上取整
  var out = new Array(arrLen)
  for (var i = 0; i < b.length; i++) {
    b[i] = b[i] & 0xff //避免负数造成影响
  }
  for (var i = 0; i < out.length; i++) {
    out[i] = byteToInt(b, i * 4)
  }
  return out
}

module.exports = SM4