679 lines
23 KiB
JavaScript
679 lines
23 KiB
JavaScript
/**
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* 国密SM4加密算法
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* 徐一杰
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* 2022/10/18
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*
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* 调用方法：
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* import {SM4Util} from '@/utils/sm4';
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* var sm4 = new SM4Util();
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* 不使用自定义 secretKey，一般用于前端自行加解密,如果是前端加密后端解密，则需要自定义secretKey，前后端一致才能正确解密
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* sm4.encryptDefault_ECB('123456');
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* sm4.decryptDefault_ECB('123456');
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* sm4.encryptCustom_ECB('123456', 'asdfghjklmnbvcx,');
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* sm4.decryptCustom_ECB('123456', 'asdfghjklmnbvcx,');
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*
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* CBC 加密模式（更加安全），需要两个密钥
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* sm4.encryptDefault_CBC('123456');
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* sm4.decryptDefault_CBC('123456');
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* 同样可以自定义 secretKey 和 iv，需要两个密钥前后端都一致
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* sm4.encryptCustom_CBC('123456', 'asdfghjklmnbvcx,', 'mnbvcxzpoiuytre1');
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* sm4.decryptCustom_CBC('123456', 'asdfghjklmnbvcx,', 'mnbvcxzpoiuytre1');
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*/
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(function (r) {
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if (typeof exports === "object" && typeof module !== "undefined") {
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module.exports = r()
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} else {
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let define;
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if (typeof define ===
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"function" && define.amd) {
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define([], r)
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} else {
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let e;
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if (typeof window !== "undefined") {
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e = window
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} else {
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if (typeof global
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!== "undefined") {
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e = global
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} else {
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if (typeof self !== "undefined") {
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e = self
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} else {
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e = this
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}
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}
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}
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e.base64js = r()
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}
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}
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})(function () {
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return function r(e, t, n) {
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const f = typeof require == "function" && require;
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function o(i, a) {
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if (!t[i]) {
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if (!e[i]) {
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const u = typeof require == "function" && require;
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if (!a && u) {
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return u(i, !0)
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}
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if (f) {
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return f(i, !0)
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}
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const d = new Error("Cannot find module '" + i + "'");
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throw d.code = "MODULE_NOT_FOUND", d
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}
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const c = t[i] = {exports: {}};
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e[i][0].call(c.exports, function (r) {
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const t = e[i][1][r];
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return o(t ? t : r)
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}, c, c.exports, r, e, t, n)
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}
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return t[i].exports
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}
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for (let i = 0; i < n.length; i++) {
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o(n[i])
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}
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return o
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}({
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"/": [function (r, e, t) {
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t.byteLength = c;
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t.toByteArray = v;
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t.fromByteArray = s;
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const n = [];
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const o = [];
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const f = typeof Uint8Array !== "undefined" ? Uint8Array : Array;
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const i = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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let a = 0, u = i.length;
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for (; a < u; ++a) {
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n[a] = i[a];
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o[i.charCodeAt(a)] = a
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}
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o["-".charCodeAt(0)] = 62;
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o["_".charCodeAt(0)] = 63;
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function d(r) {
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const e = r.length;
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if (e % 4 > 0) {
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throw new Error("Invalid string. Length must be a multiple of 4")
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}
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return r[e - 2] === "=" ? 2 : r[e - 1] === "=" ? 1 : 0
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}
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function c(r) {
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return r.length * 3 / 4 - d(r)
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}
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function v(r) {
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let e, t, n, i, a;
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const u = r.length;
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i = d(r);
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a = new f(u * 3 / 4 - i);
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t = i > 0 ? u - 4 : u;
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let c = 0;
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for (e = 0; e < t; e += 4) {
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n = o[r.charCodeAt(e)] << 18 | o[r.charCodeAt(e + 1)] << 12 | o[r.charCodeAt(e + 2)] << 6 | o[r.charCodeAt(e + 3)];
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a[c++] = n >> 16 & 255;
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a[c++] = n >> 8 & 255;
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a[c++] = n & 255
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}
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if (i === 2) {
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n = o[r.charCodeAt(e)] << 2 | o[r.charCodeAt(e + 1)] >> 4;
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a[c++] = n & 255
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} else {
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if (i === 1) {
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n = o[r.charCodeAt(e)] << 10 | o[r.charCodeAt(e + 1)] << 4 | o[r.charCodeAt(e + 2)] >> 2;
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a[c++] = n >> 8 & 255;
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a[c++] = n & 255
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}
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}
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return a
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}
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function l(r) {
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return n[r >> 18 & 63] + n[r >> 12 & 63] + n[r >> 6 & 63] + n[r & 63]
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}
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function h(r, e, t) {
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let n;
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const o = [];
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for (let f = e; f < t; f += 3) {
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n = (r[f] << 16) + (r[f + 1] << 8) + r[f + 2];
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o.push(l(n))
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}
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return o.join("")
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}
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function s(r) {
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let e;
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const t = r.length;
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const o = t % 3;
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let f = "";
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const i = [];
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const a = 16383;
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let u = 0, d = t - o;
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for (; u < d; u += a) {
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i.push(h(r, u, u + a > d ? d : u + a))
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}
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if (o === 1) {
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e = r[t - 1];
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f += n[e >> 2];
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f += n[e << 4 & 63];
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f += "=="
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} else {
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if (o === 2) {
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e = (r[t - 2] << 8) + r[t - 1];
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f += n[e >> 10];
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f += n[e >> 4 & 63];
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f += n[e << 2 & 63];
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f += "="
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}
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}
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i.push(f);
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return i.join("")
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}
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}, {}]
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}, {}, [])("/")
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});
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function SM4_Context() {
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this.mode = 1;
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this.isPadding = true;
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this.sk = new Array(32);
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}
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function SM4() {
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this.SM4_ENCRYPT = 1;
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this.SM4_DECRYPT = 0;
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const SboxTable = [0xd6, 0x90, 0xe9, 0xfe, 0xcc, 0xe1, 0x3d, 0xb7, 0x16, 0xb6, 0x14, 0xc2, 0x28, 0xfb, 0x2c, 0x05,
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0x2b, 0x67, 0x9a, 0x76, 0x2a, 0xbe, 0x04, 0xc3, 0xaa, 0x44, 0x13, 0x26, 0x49, 0x86, 0x06, 0x99,
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0x9c, 0x42, 0x50, 0xf4, 0x91, 0xef, 0x98, 0x7a, 0x33, 0x54, 0x0b, 0x43, 0xed, 0xcf, 0xac, 0x62,
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0xe4, 0xb3, 0x1c, 0xa9, 0xc9, 0x08, 0xe8, 0x95, 0x80, 0xdf, 0x94, 0xfa, 0x75, 0x8f, 0x3f, 0xa6,
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0x47, 0x07, 0xa7, 0xfc, 0xf3, 0x73, 0x17, 0xba, 0x83, 0x59, 0x3c, 0x19, 0xe6, 0x85, 0x4f, 0xa8,
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0x68, 0x6b, 0x81, 0xb2, 0x71, 0x64, 0xda, 0x8b, 0xf8, 0xeb, 0x0f, 0x4b, 0x70, 0x56, 0x9d, 0x35,
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0x1e, 0x24, 0x0e, 0x5e, 0x63, 0x58, 0xd1, 0xa2, 0x25, 0x22, 0x7c, 0x3b, 0x01, 0x21, 0x78, 0x87,
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0xd4, 0x00, 0x46, 0x57, 0x9f, 0xd3, 0x27, 0x52, 0x4c, 0x36, 0x02, 0xe7, 0xa0, 0xc4, 0xc8, 0x9e,
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0xea, 0xbf, 0x8a, 0xd2, 0x40, 0xc7, 0x38, 0xb5, 0xa3, 0xf7, 0xf2, 0xce, 0xf9, 0x61, 0x15, 0xa1,
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0xe0, 0xae, 0x5d, 0xa4, 0x9b, 0x34, 0x1a, 0x55, 0xad, 0x93, 0x32, 0x30, 0xf5, 0x8c, 0xb1, 0xe3,
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0x1d, 0xf6, 0xe2, 0x2e, 0x82, 0x66, 0xca, 0x60, 0xc0, 0x29, 0x23, 0xab, 0x0d, 0x53, 0x4e, 0x6f,
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0xd5, 0xdb, 0x37, 0x45, 0xde, 0xfd, 0x8e, 0x2f, 0x03, 0xff, 0x6a, 0x72, 0x6d, 0x6c, 0x5b, 0x51,
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0x8d, 0x1b, 0xaf, 0x92, 0xbb, 0xdd, 0xbc, 0x7f, 0x11, 0xd9, 0x5c, 0x41, 0x1f, 0x10, 0x5a, 0xd8,
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0x0a, 0xc1, 0x31, 0x88, 0xa5, 0xcd, 0x7b, 0xbd, 0x2d, 0x74, 0xd0, 0x12, 0xb8, 0xe5, 0xb4, 0xb0,
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0x89, 0x69, 0x97, 0x4a, 0x0c, 0x96, 0x77, 0x7e, 0x65, 0xb9, 0xf1, 0x09, 0xc5, 0x6e, 0xc6, 0x84,
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0x18, 0xf0, 0x7d, 0xec, 0x3a, 0xdc, 0x4d, 0x20, 0x79, 0xee, 0x5f, 0x3e, 0xd7, 0xcb, 0x39, 0x48];
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const FK = [0xa3b1bac6, 0x56aa3350, 0x677d9197, 0xb27022dc];
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const CK = [0x00070e15, 0x1c232a31, 0x383f464d, 0x545b6269,
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0x70777e85, 0x8c939aa1, 0xa8afb6bd, 0xc4cbd2d9,
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0xe0e7eef5, 0xfc030a11, 0x181f262d, 0x343b4249,
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0x50575e65, 0x6c737a81, 0x888f969d, 0xa4abb2b9,
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0xc0c7ced5, 0xdce3eaf1, 0xf8ff060d, 0x141b2229,
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0x30373e45, 0x4c535a61, 0x686f767d, 0x848b9299,
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0xa0a7aeb5, 0xbcc3cad1, 0xd8dfe6ed, 0xf4fb0209,
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0x10171e25, 0x2c333a41, 0x484f565d, 0x646b7279];
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this.GET_ULONG_BE = function (b, i) {
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return (b[i] & 0xff) << 24 | ((b[i + 1] & 0xff) << 16) | ((b[i + 2] & 0xff) << 8) | (b[i + 3] & 0xff) & 0xffffffff;
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}
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this.PUT_ULONG_BE = function (n, b, i) {
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var t1 = (0xFF & (n >> 24));
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var t2 = (0xFF & (n >> 16));
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var t3 = (0xFF & (n >> 8));
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var t4 = (0xFF & (n));
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b[i] = t1 > 128 ? t1 - 256 : t1;
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b[i + 1] = t2 > 128 ? t2 - 256 : t2;
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b[i + 2] = t3 > 128 ? t3 - 256 : t3;
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b[i + 3] = t4 > 128 ? t4 - 256 : t4;
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}
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this.SHL = function (x, n) {
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return (x & 0xFFFFFFFF) << n;
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}
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this.ROTL = function (x, n) {
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// const s = this.SHL(x, n);
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// const ss = x >> (32 - n);
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return this.SHL(x, n) | x >> (32 - n);
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}
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this.sm4Lt = function (ka) {
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let bb;
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let c;
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const a = new Array(4);
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const b = new Array(4);
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this.PUT_ULONG_BE(ka, a, 0);
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b[0] = this.sm4Sbox(a[0]);
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b[1] = this.sm4Sbox(a[1]);
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b[2] = this.sm4Sbox(a[2]);
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b[3] = this.sm4Sbox(a[3]);
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bb = this.GET_ULONG_BE(b, 0);
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c = bb ^ this.ROTL(bb, 2) ^ this.ROTL(bb, 10) ^ this.ROTL(bb, 18) ^ this.ROTL(bb, 24);
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return c;
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}
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this.sm4F = function (x0, x1, x2, x3, rk) {
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return x0 ^ this.sm4Lt(x1 ^ x2 ^ x3 ^ rk);
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}
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this.sm4CalciRK = function (ka) {
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let bb;
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let rk;
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const a = new Array(4);
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const b = new Array(4);
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this.PUT_ULONG_BE(ka, a, 0);
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b[0] = this.sm4Sbox(a[0]);
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b[1] = this.sm4Sbox(a[1]);
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b[2] = this.sm4Sbox(a[2]);
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b[3] = this.sm4Sbox(a[3]);
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bb = this.GET_ULONG_BE(b, 0);
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rk = bb ^ this.ROTL(bb, 13) ^ this.ROTL(bb, 23);
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return rk;
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}
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this.sm4Sbox = function (inch) {
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const i = inch & 0xFF;
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const retVal = SboxTable[i];
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return retVal > 128 ? retVal - 256 : retVal;
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}
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this.sm4_setkey_enc = function (ctx, key) {
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if (ctx == null) {
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alert("ctx is null!");
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return false;
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}
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if (key == null || key.length !== 16) {
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alert("key error!");
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return false;
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}
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ctx.mode = this.SM4_ENCRYPT;
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this.sm4_setkey(ctx.sk, key);
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};
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//生成解密密钥
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this.sm4_setkey_dec = function (ctx, key) {
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if (ctx == null) {
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Error("ctx is null!");
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}
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if (key == null || key.length !== 16) {
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Error("2key error!");
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}
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// var i = 0;
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ctx.mode = 0;
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this.sm4_setkey(ctx.sk, key);
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ctx.sk = ctx.sk.reverse();
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}
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this.sm4_setkey = function (SK, key) {
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const MK = new Array(4);
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const k = new Array(36);
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// var i = 0;
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MK[0] = this.GET_ULONG_BE(key, 0);
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MK[1] = this.GET_ULONG_BE(key, 4);
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MK[2] = this.GET_ULONG_BE(key, 8);
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MK[3] = this.GET_ULONG_BE(key, 12);
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k[0] = MK[0] ^ FK[0];
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k[1] = MK[1] ^ FK[1];
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k[2] = MK[2] ^ FK[2];
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k[3] = MK[3] ^ FK[3];
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for (let i = 0; i < 32; i++) {
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k[(i + 4)] = (k[i] ^ this.sm4CalciRK(k[(i + 1)] ^ k[(i + 2)] ^ k[(i + 3)] ^ CK[i]));
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SK[i] = k[(i + 4)];
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}
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}
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this.padding = function (input, mode) {
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let p;
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if (input == null) {
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return null;
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}
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let ret = null;
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if (mode === this.SM4_ENCRYPT) {
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p = parseInt(16 - input.length % 16);
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ret = input.slice(0);
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for (let i = 0; i < p; i++) {
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ret[input.length + i] = p;
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}
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} else {
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p = input[input.length - 1];
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ret = input.slice(0, input.length - p);
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}
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return ret;
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}
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this.sm4_one_round = function (sk, input, output) {
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let i = 0;
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const ulbuf = new Array(36);
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ulbuf[0] = this.GET_ULONG_BE(input, 0);
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ulbuf[1] = this.GET_ULONG_BE(input, 4);
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ulbuf[2] = this.GET_ULONG_BE(input, 8);
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ulbuf[3] = this.GET_ULONG_BE(input, 12);
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while (i < 32) {
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ulbuf[(i + 4)] = this.sm4F(ulbuf[i], ulbuf[(i + 1)], ulbuf[(i + 2)], ulbuf[(i + 3)], sk[i]);
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i++;
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}
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this.PUT_ULONG_BE(ulbuf[35], output, 0);
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this.PUT_ULONG_BE(ulbuf[34], output, 4);
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this.PUT_ULONG_BE(ulbuf[33], output, 8);
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this.PUT_ULONG_BE(ulbuf[32], output, 12);
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}
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this.sm4_crypt_ecb = function (ctx, input) {
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if (input == null) {
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alert("input is null!");
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}
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if ((ctx.isPadding) && (ctx.mode === this.SM4_ENCRYPT)) {
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input = this.padding(input, this.SM4_ENCRYPT);
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}
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let i = 0;
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let length = input.length;
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let bous = [];
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for (; length > 0; length -= 16) {
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var out = new Array(16);
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var ins = input.slice(i * 16, (16 * (i + 1)));
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this.sm4_one_round(ctx.sk, ins, out)
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bous = bous.concat(out);
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i++;
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}
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let output = bous;
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if (ctx.isPadding && ctx.mode === this.SM4_DECRYPT) {
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output = this.padding(output, this.SM4_DECRYPT);
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}
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for (i = 0; i < output.length; i++) {
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if (output[i] < 0) {
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output[i] = output[i] + 256;
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}
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}
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return output;
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}
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this.sm4_crypt_cbc = function (ctx, iv, input) {
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let out;
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let ins;
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let out1;
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let k;
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if (iv == null || iv.length !== 16) {
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alert("iv error!");
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}
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if (input == null) {
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alert("input is null!");
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}
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if (ctx.isPadding && ctx.mode === this.SM4_ENCRYPT) {
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input = this.padding(input, this.SM4_ENCRYPT);
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}
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let i = 0;
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let length = input.length;
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let bous = [];
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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;
|
||
}
|
||
}
|
||
|
||
|
||
const SM4Util = function () {
|
||
// 和后端secretKey一致才能正确解密，可自定义传入，如果不传，则使用下面的默认secretKey
|
||
this.secretKey ="zhgd@bonus123456";
|
||
// 当时用CBC模式的时候，除了secretKey，还需要 iv，可自定义传入，如果不传，则使用下面的默认iv
|
||
this.iv ="1234567812345678";
|
||
this.hexString = false;
|
||
// ECB模式加密，默认secretKey
|
||
this.encryptDefault_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;
|
||
}
|
||
}
|
||
// ECB模式加密，自定义secretKey
|
||
this.encryptCustom_ECB = function (plainText, secretKey) {
|
||
try {
|
||
const sm4 = new SM4();
|
||
const ctx = new SM4_Context();
|
||
ctx.isPadding = true;
|
||
ctx.mode = sm4.SM4_ENCRYPT;
|
||
const keyBytes = this.stringToByte(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，默认secretKey
|
||
this.decryptDefault_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 this.byteToString(decrypted);
|
||
} catch (e) {
|
||
console.error(e);
|
||
return null;
|
||
}
|
||
}
|
||
//解密_ECB，自定义secretKey
|
||
this.decryptCustom_ECB = 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);
|
||
sm4.sm4_setkey_dec(ctx, keyBytes);
|
||
let decrypted = sm4.sm4_crypt_ecb(ctx, base64js.toByteArray(cipherText));
|
||
return this.byteToString(decrypted);
|
||
} catch (e) {
|
||
console.error(e);
|
||
return null;
|
||
}
|
||
}
|
||
|
||
// CBC模式加密，默认 iv 和 secretKey
|
||
this.encryptDefault_CBC = 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);
|
||
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;
|
||
}
|
||
}
|
||
// CBC模式加密，自定义 iv 和 secretKey
|
||
this.encryptCustom_CBC = function (plainText, iv, secretKey) {
|
||
try {
|
||
const sm4 = new SM4();
|
||
const ctx = new SM4_Context();
|
||
ctx.isPadding = true;
|
||
ctx.mode = sm4.SM4_ENCRYPT;
|
||
|
||
const keyBytes = this.stringToByte(secretKey);
|
||
const ivBytes = this.stringToByte(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，默认 iv 和 secretKey
|
||
this.decryptDefault_CBC = 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);
|
||
let ivBytes = this.stringToByte(this.iv);
|
||
sm4.sm4_setkey_dec(ctx, keyBytes);
|
||
let decrypted = sm4.sm4_crypt_cbc(ctx, ivBytes, base64js.toByteArray(cipherText));
|
||
return this.byteToString(decrypted);
|
||
} catch (e) {
|
||
console.error(e);
|
||
return null;
|
||
}
|
||
}
|
||
//解密_CBC，自定义 iv 和 secretKey
|
||
this.decryptCustom_CBC = function (cipherText, iv, secretKey) {
|
||
try {
|
||
let sm4 = new SM4();
|
||
let ctx = new SM4_Context();
|
||
ctx.isPadding = true;
|
||
ctx.mode = sm4.SM4_ENCRYPT;
|
||
let keyBytes = this.stringToByte(secretKey);
|
||
let ivBytes = this.stringToByte(iv);
|
||
sm4.sm4_setkey_dec(ctx, keyBytes);
|
||
let decrypted = sm4.sm4_crypt_cbc(ctx, ivBytes, base64js.toByteArray(cipherText));
|
||
return this.byteToString(decrypted);
|
||
} 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;
|
||
}
|
||
};
|