本文介绍了一种基于SM4加密算法的前后端加密方案，并提供了完整的JavaScript和Java代码实现，包括ECB和CBC两种模式。
1.前言
近期做国密改造，需要前后端采用混合加密，其中SM4算法网上资源很少，即使有也是前台JS和后台JAVA加解密不一致。
最后找到可靠的代码如下：
参考大神链接【资源整合贴，不过后台使用的是.net后台】
参考大神链接【后端代码不全】：国密SM4，javaScript / vue加密解密 java加密解密
参考大神链接【前端代码不全】：SM4 js,java加解密
整合几位大神资源后实现SM4的前后端ECB模式/CBC模式加密解密。
2.前端JavaScript
2.1.代码输出截图：
2.2.完整代码：
<!DOCTYPE html<html>
<head>
<meta charset="UTF-8">
<title>SM4的加密解密</title>
</head>
<body>
<script type="text/javascript">
/**
* base64js
*/
(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
*/
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, 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,
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);
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
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