国密sm4 CBC加密模式的使用方法(兼容IE11)

国密sm4 CBC加密模式的使用方法(兼容IE11),第1张

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 *** 作。

SM4文件

function setTextEncoder(){ //解决IE不兼容TextEncoder,TextDecoder
    if (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.TextEncoder
        var encoder = new TextEncoder();
        return encoder.encode(str);
    },
    utf8ArrayBufferToString: function (strBuffer) {
        var TextDecoder = (typeof window === 'undefined') ? require('util').TextDecoder : window.TextDecoder
        var 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 = keyBuffer
        var 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 = ivBuffer
        mode = '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_BLOCK
        var 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_BLOCK
                var 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 = cipherBlock
                for (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_BLOCK
                var 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 cipherByteArray
        if (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_BLOCK
        var 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_BLOCK
                var 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 = block
                for (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_BLOCK
                var 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_BLOCK
    var 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utf8
    const 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iv
          key: strToHexCharCode(strToUtf8Bytes(key)),
          iv: strToHexCharCode(strToUtf8Bytes(iv)),
        };

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原文地址: http://outofmemory.cn/web/940667.html

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