国密sm4 CBC加密模式的使用方法（兼容IE11）

使用架构：vue，jquery

前端和后台加解密交互流程

前端随机生成16位随机数来用去前端的加解密

前端生成的16位随机数通过base16，utf-8转换生成32位的key，iv传递给后台来进行对称加密（后台加解密用的是32位的key，iv）

注意事项：因为sm4是对称加密所以前后端加解密需要用同一个key，iv来进行操作。

SM4文件

function setTextEncoder(){ //解决IE不兼容TextEncoder,TextDecoderif (typeof TextEncoder == "function") { return; }function _TextEncoder() {}_TextEncoder.prototype.encode = function (s) {var data = unescape(encodeURIComponent(s)).split('').map(function (val) { return val.charCodeAt(); });return typeof Uint8Array == "function" ? new Uint8Array(data) : data;//new TextEncoder().encode返回Uint8Array};function _TextDecoder() {}_TextDecoder.prototype.decode = function (code_arr) {return decodeURIComponent(escape(String.fromCharCode.apply(null, code_arr)));};window.TextEncoder = _TextEncoder;window.TextDecoder = _TextDecoder;
}
setTextEncoder();
//解决IEUint8Array不兼容slice
try {new Uint8Array().slice(0, 2);
} catch (e) {Uint8Array.prototype.slice = Array.prototype.slice;Uint8Array.prototype.fill = Array.prototype.fill;
}
if (!Float32Array.prototype.slice) {Float32Array.prototype.slice = function () {return new Float32Array(this).subarray(this.arguments);}
};
var Crypt = {stringToArrayBufferInUtf8: function (str) {var TextEncoder = (typeof window === 'undefined') ? require('util').TextEncoder : window.TextEncodervar encoder = new TextEncoder();return encoder.encode(str);},utf8ArrayBufferToString: function (strBuffer) {var TextDecoder = (typeof window === 'undefined') ? require('util').TextDecoder : window.TextDecodervar decoder = new TextDecoder('utf-8')return decoder.decode(strBuffer)},arrayBufferToBase64: function (strBuffer) {return base64js.fromByteArray(strBuffer)},base64ToArrayBuffer: function (base64) {return base64js.toByteArray(base64)},byteToHex: function (arrBytes) {var str = "";for (var i = 0; i < arrBytes.length; i++) {var tmp;var num = arrBytes[i];if (num < 0) {tmp = (255 + num + 1).toString(16);} else {tmp = num.toString(16);}if (tmp.length == 1) {tmp = "0" + tmp;}str += tmp;}return str.toUpperCase();},HexString2Bytes: function (str) {var pos = 0;var len = str.length;if (len % 2 != 0) {return null;}len /= 2;var arrBytes = new Array();for (var i = 0; i < len; i++) {var s = str.substr(pos, 2);var v = parseInt(s, 16);arrBytes.push(v);pos += 2;}return arrBytes;}
};var UINT8_BLOCK = 16
var Sbox = [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 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
]
var FK = [0xa3b1bac6, 0x56aa3350, 0x677d9197, 0xb27022dc
]var iv = ""; //iv
var key = "";//key
var mode = "cbc"//加密模式
var cipherType = "base64";//编码格式
var decryptRoundKeys = "";
var encryptRoundKeys = "";
var SM4 = {constructorInit: function (config) {var keyBuffer = Crypt.stringToArrayBufferInUtf8(config.key)if (keyBuffer.length !== 16) {throw new Error('key should be a 16 bytes string')}key = keyBuffervar ivBuffer = new Uint8Array(0)if (config.iv !== undefined && config.iv !== null) {ivBuffer = Crypt.stringToArrayBufferInUtf8(config.iv)if (ivBuffer.length !== 16) {throw new Error('iv should be a 16 bytes string')}}iv = ivBuffermode = 'cbc'cipherType = 'base64'if (['base64', 'text'].indexOf(config.outType) >= 0) {cipherType = config.outType}encryptRoundKeys = new Uint32Array(32)spawnEncryptRoundKeys()decryptRoundKeys = encryptRoundKeys// decryptRoundKeys.reverse();var arr = [];for (var i = decryptRoundKeys.length - 1; i >= 0; i--) {arr.push(decryptRoundKeys[i])}decryptRoundKeys = arr;},encrypt: function (plaintext) {//加密var plainByteArray = Crypt.stringToArrayBufferInUtf8(plaintext)var padded = padding(plainByteArray)var blockTimes = padded.length / UINT8_BLOCKvar outArray = new Uint8Array(padded.length)if (mode === 'cbc') {if (iv === null || iv.length !== 16) {throw new Error('iv error')}var chainBlock = uint8ToUint32Block(iv, 0)for (var i = 0; i < blockTimes; i++) {var roundIndex = i * UINT8_BLOCKvar block = uint8ToUint32Block(padded, roundIndex)chainBlock[0] = chainBlock[0] ^ block[0]chainBlock[1] = chainBlock[1] ^ block[1]chainBlock[2] = chainBlock[2] ^ block[2]chainBlock[3] = chainBlock[3] ^ block[3]var cipherBlock = doBlockCrypt(chainBlock, encryptRoundKeys)chainBlock = cipherBlockfor (var l = 0; l < UINT8_BLOCK; l++) {outArray[roundIndex + l] = cipherBlock[parseInt(l / 4)] >> ((3 - l) % 4 * 8) & 0xff}}return Crypt.byteToHex(outArray)} else {for (var i = 0; i < blockTimes; i++) {var roundIndex = i * UINT8_BLOCKvar block = uint8ToUint32Block(padded, roundIndex)var cipherBlock = doBlockCrypt(block, encryptRoundKeys)for (var l = 0; l < UINT8_BLOCK; l++) {outArray[roundIndex + l] = cipherBlock[parseInt(l / 4)] >> ((3 - l) % 4 * 8) & 0xff}}if (cipherType === 'base64') {return Crypt.arrayBufferToBase64(outArray)} else {return Crypt.utf8ArrayBufferToString(outArray)}}},decrypt: function (ciphertext) { //解密var cipherByteArrayif (mode === 'cbc') {cipherByteArray = Crypt.HexString2Bytes(ciphertext)} else {if (cipherType === 'base64') {cipherByteArray = Crypt.base64ToArrayBuffer(ciphertext)} else {cipherByteArray = Crypt.stringToArrayBufferInUtf8(ciphertext)}}if (!cipherByteArray)return ''var blockTimes = cipherByteArray.length / UINT8_BLOCKvar outArray = new Uint8Array(cipherByteArray.length)if (mode === 'cbc') {if (iv === null || iv.length !== 16) {throw new Error('iv error')}var chainBlock = uint8ToUint32Block(iv, 0)for (var i = 0; i < blockTimes; i++) {var roundIndex = i * UINT8_BLOCKvar block = uint8ToUint32Block(cipherByteArray, roundIndex)var plainBlockBeforeXor = doBlockCrypt(block, decryptRoundKeys)var plainBlock = new Uint32Array(4)plainBlock[0] = chainBlock[0] ^ plainBlockBeforeXor[0]plainBlock[1] = chainBlock[1] ^ plainBlockBeforeXor[1]plainBlock[2] = chainBlock[2] ^ plainBlockBeforeXor[2]plainBlock[3] = chainBlock[3] ^ plainBlockBeforeXor[3]chainBlock = blockfor (var l = 0; l < UINT8_BLOCK; l++) {outArray[roundIndex + l] = plainBlock[parseInt(l / 4)] >> ((3 - l) % 4 * 8) & 0xff}}} else {for (var i = 0; i < blockTimes; i++) {var roundIndex = i * UINT8_BLOCKvar block = uint8ToUint32Block(cipherByteArray, roundIndex)var plainBlock = doBlockCrypt(block, decryptRoundKeys)for (var l = 0; l < UINT8_BLOCK; l++) {outArray[roundIndex + l] = plainBlock[parseInt(l / 4)] >> ((3 - l) % 4 * 8) & 0xff}}}var depaddedPlaintext = dePadding(outArray)return Crypt.utf8ArrayBufferToString(depaddedPlaintext)}
}
function doBlockCrypt(blockData, roundKeys) {var xBlock = new Uint32Array(36)xBlock.set(blockData, 0)for (var i = 0; i < 32; i++) {xBlock[i + 4] = xBlock[i] ^ tTransform1(xBlock[i + 1] ^ xBlock[i + 2] ^ xBlock[i + 3] ^ roundKeys[i])}var yBlock = new Uint32Array(4)yBlock[0] = xBlock[35]yBlock[1] = xBlock[34]yBlock[2] = xBlock[33]yBlock[3] = xBlock[32]return yBlock
}
function spawnEncryptRoundKeys() {var mk = new Uint32Array(4)mk[0] = key[0] << 24 | key[1] << 16 | key[2] << 8 | key[3]mk[1] = key[4] << 24 | key[5] << 16 | key[6] << 8 | key[7]mk[2] = key[8] << 24 | key[9] << 16 | key[10] << 8 | key[11]mk[3] = key[12] << 24 | key[13] << 16 | key[14] << 8 | key[15]var k = new Uint32Array(36)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] ^ tTransform2(k[i + 1] ^ k[i + 2] ^ k[i + 3] ^ CK[i])encryptRoundKeys[i] = k[i + 4]}
}
function rotateLeft(x, y) {return x << y | x >>> (32 - y)
}function linearTransform1(b) {return b ^ rotateLeft(b, 2) ^ rotateLeft(b, 10) ^ rotateLeft(b, 18) ^ rotateLeft(b, 24)
}function linearTransform2(b) {return b ^ rotateLeft(b, 13) ^ rotateLeft(b, 23)
}function tauTransform(a) {return Sbox[a >>> 24 & 0xff] << 24 | Sbox[a >>> 16 & 0xff] << 16 | Sbox[a >>> 8 & 0xff] << 8 | Sbox[a &0xff]
}function tTransform1(z) {var b = tauTransform(z)var c = linearTransform1(b)return c
}function tTransform2(z) {var b = tauTransform(z)var c = linearTransform2(b)return c
}
function padding(originalBuffer) {if (originalBuffer === null) {return null}var paddingLength = UINT8_BLOCK - originalBuffer.length % UINT8_BLOCKvar paddedBuffer = new Uint8Array(originalBuffer.length + paddingLength)paddedBuffer.set(originalBuffer, 0)// paddedBuffer.fill(paddingLength, originalBuffer.length)for (var i = 0; i <= paddedBuffer.length; i++) {if (i >= originalBuffer.length) paddedBuffer[i] = paddingLength}return paddedBuffer
}function dePadding(paddedBuffer) {if (paddedBuffer === null) {return null}var paddingLength = paddedBuffer[paddedBuffer.length - 1]var originalBuffer = paddedBuffer.slice(0, paddedBuffer.length - paddingLength)return originalBuffer
}function uint8ToUint32Block(uint8Array, baseIndex) {var block = new Uint32Array(4)block[0] = uint8Array[baseIndex] << 24 | uint8Array[baseIndex + 1] << 16 | uint8Array[baseIndex + 2] << 8 |uint8Array[baseIndex + 3]block[1] = uint8Array[baseIndex + 4] << 24 | uint8Array[baseIndex + 5] << 16 | uint8Array[baseIndex + 6] <<8 |uint8Array[baseIndex + 7]block[2] = uint8Array[baseIndex + 8] << 24 | uint8Array[baseIndex + 9] << 16 | uint8Array[baseIndex + 10] <<8 |uint8Array[baseIndex + 11]block[3] = uint8Array[baseIndex + 12] << 24 | uint8Array[baseIndex + 13] << 16 | uint8Array[baseIndex +14] << 8 |uint8Array[baseIndex + 15]return block
}
export default SM4;//vue的导出
window.SM4 = SM4;//jquery的导出

使用方法(vue，jquery)举例vue的用法，jquery用法是一致的只是换了一下引用方式

import SM4 from "@/utils/sm4/sm4.js";  //导入sm4.js文件sm4Encrypt(msg) {//加密let msgString = msg;if (typeof (msgString) !== 'string') {msgString = JSON.stringify(msg);}console.log("接口入参未加密*****************", msg);SM4.constructorInit(store.getters.sm4Config);return SM4.encrypt(msgString)},sm4Decrypt(msg) { //解密SM4.constructorInit(store.getters.sm4Config);console.log(JSON.parse(SM4.decrypt(msg)), "解密结果");return JSON.parse(SM4.decrypt(msg))},

store.getters.sm4Config传入的是前端生成的16位的key和iv。

注意：前端加解密用的key和iv是16位的但是传递给后台的key和iv是32位的这里需要前端base16,utf8转换

export const strToHexCharCode = (str) => { //转换base16编码var hexCharCode = [];var chars = ["0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "A", "B", "C", "D", "E", "F"];for (var i = 0; i < str.length; i++) {var bit = (str[i] & 0x0f0) >> 4;hexCharCode.push(chars[bit]);var bit = str[i] & 0x0f;hexCharCode.push(chars[bit]);}return hexCharCode.join("");
}export const strToUtf8Bytes = (str) => { //转换utf8const utf8 = [];for (let ii = 0; ii < str.length; ii++) {let charCode = str.charCodeAt(ii);if (charCode < 0x80) utf8.push(charCode);else if (charCode < 0x800) {utf8.push(0xc0 | (charCode >> 6), 0x80 | (charCode & 0x3f));} else if (charCode < 0xd800 || charCode >= 0xe000) {utf8.push(0xe0 | (charCode >> 12), 0x80 | ((charCode >> 6) & 0x3f), 0x80 | (charCode & 0x3f));} else {ii++;charCode = 0x10000 + (((charCode & 0x3ff) << 10) | (str.charCodeAt(ii) & 0x3ff));utf8.push(0xf0 | (charCode >> 18),0x80 | ((charCode >> 12) & 0x3f),0x80 | ((charCode >> 6) & 0x3f),0x80 | (charCode & 0x3f))}}for (let jj = 0; jj < utf8.length; jj++) {var code = utf8[jj];if (code > 127) {utf8[jj] = code - 256;}}return utf8;
}

转换base16使用方法

        let params = { //使用base16编码转换key和ivkey: strToHexCharCode(strToUtf8Bytes(key)),iv: strToHexCharCode(strToUtf8Bytes(iv)),};

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