国密SM4，javaScriptvue加密解密java加密解密
⽂章⽬录
1. SM算法简介
SM算法：国密即国家密码局认定的国产密码算法。主要有SM1，SM2，SM3，SM4。密钥长度和分组长度均为128位。
SM1 为对称加密。其加密强度与AES相当。该算法不公开，调⽤该算法时，需要通过加密芯⽚的接⼝进⾏调⽤。
SM2为⾮对称加密，基于ECC。该算法已公开。由于该算法基于ECC，故其签名速度与秘钥⽣成速度都快于RSA。ECC 256位（SM2采⽤的就是ECC 256位的⼀种）安全强度⽐RSA 2048位⾼，但运算速度快于RSA。
SM3 消息摘要。可以⽤MD5作为对⽐理解。该算法已公开。校验结果为256位。
SM4 ⽆线局域⽹标准的分组数据算法。对称加密，密钥长度和分组长度均为128位。
2. 百度SM4算法实现的⼼酸历程
我⼤量尝试了⽹上其他博主的SM算法相关的博客，但是均是前端可以实现加解密，但是后端返回数据就解密失败。不匹配问题。所以我们需要匹配前端和后端保持⼀致
相关博客：
SM4⽹上有许多java代码，但javaScript代码实现缺很少。以下代码是根据Java代码⾃⼰写的JavaScript版本：
本着前端的思维，因为这段时间的⼯作需要，接触到了SM算法，本篇采⽤的是SM4 分前端javascript及后端的java两部分。
3. SM4 前端javascript代码实现加密解密
<!DOCTYPE html<html>
<head>
<meta charset="UTF-8">
<title>javaScript加密解密</title>
</head>
<body>
<script type="text/javascript">
/**
* @email 70255403@qq
* @date 2020-07-14
*/
(function(r){if(typeof exports ==="object"&&typeof module !=="undefined"){ ports =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 +"'");de = "MODULE_N
OT_FOUND", d }var c = t[i]={ exports:{}}; e[i][0].ports,function(r){var t = e[i][1][r];return o(t ? t : r)}, c, c.exports, r, e, t, n)}retur n 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.to ByteArray = v; t.fromByteArray = s;var n =[];var o =[];var f =typeof Uint8Array !=="undefined"? Uint8Array : Array;var i ="ABCDEFGHIJKLMNOPQRST UVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";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.charCo deAt(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 +="=="}el se{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
* @email 70255403@qq
* @date 2020-07-14
*/
function SM4_Context(){
this.isPadding =true;
this.sk =new Array(32);
}
function SM4(){
this.SM4_ENCRYPT=1;
this.SM4_DECRYPT=0;
var 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];
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,typeof array
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){
var s =this.SHL(x, n);
var ss = x >>(32- 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;
}
if(key ==null|| key.length !=16){
alert("key error!");
return false;
}
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("key error!");
}
var i =0;
this.sm4_setkey(ctx.sk, key);
ctx.sk = verse();
}
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){
this.sm4_crypt_ecb=function(ctx, input){
if(input ==null){
alert("input is null!");
}
if((ctx.isPadding)&&(de ==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 = at(out);
i++;
}
var output = bous;
if(ctx.isPadding && de ==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 && de ==this.SM4_ENCRYPT){
input =this.padding(input,this.SM4_ENCRYPT);
}
var i =0;
var length = input.length;
var bous =new Array();
de ==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 = at(out1);
k++;
}
}
else{
var temp =[];
var k =0;

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