VUE内使用RSA加解密

说明：为防止私钥泄漏，由服务端生成两对密钥，分别是（前端公钥+私钥，后端公钥加私钥），采用加解密模式为：前端使用后台公钥加密，使用前端私钥解密；后端使用前端公钥加密，使用后端私钥解密。前后端统一使用公钥加密，私钥解密

一、现在vue项目中安装依赖包jsencrypt

npm install jsencrypt --save-dev

二、在项目中新建jsencryptKey.js，用来存放公共加解密方法

 三、jsencryptKey.js内引入依赖jsencrypt.js

四、加解密方法

//加密
//str 未加密字符串
export function getEncryCode(str){
    //实例化JSEncrypt
    let jse = new JSEncrypt();
    //加密公钥（由服务端生成）
    let pubKey = `-----BEGIN PUBLIC KEY-----
MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCmBjTNoNbIjrZVoEt5OBNM6zZ/
yDZ7wgv53A6ekTuAsqfJ3jXmLC7PqqrJxgqqDf2l72CnRC8ZxIAkiUBmIK/FIDrl
qCBPl1h0Ym8qPLmUuv5l3xmhlb6+a/v22444PW/U6Ur0l1BvbCorrsWV3leFFfLZ
5oT4mq9jXzkQLv8F6wIDAQAB
-----END PUBLIC KEY-----`

    jse.setPublicKey(pubKey);
    let  data = jse.encrypt(str.toString());  // 进行加密
    return data;
}

//解密
//params 待解密字符串
export function sendEncryCode(params){
    //实例化JSEncrypt
    let jse = new JSEncrypt();
    //使用前端私钥解密（私钥由服务端生成）
    let privKey = `-----BEGIN PRIVATE KEY-----
    MIICdQIBADANBgkqhkiG9w0BAQEFAASCAl8wggJbAgEAAoGBAKYGNM2g1siOtlWg
    S3k4E0zrNn/INnvCC/ncDp6RO4Cyp8neNeYsLs+qqsnGCqoN/aXvYKdELxnEgCSJ
    QGYgr8UgOuWoIE+XWHRibyo8uZS6/mXfGaGVvr5r+/bbjjg9b9TpSvSXUG9sKiuu
    xZXeV4UV8tnmhPiar2NfORAu/wXrAgMBAAECf0qUfyPgHJv7f+z3FPBfQExNXS4J
    wm/Vu4uCTw7sLs6hcr48E/pR3rVq9U2uqRu7LTZdUg3Rk1b/7pB7F3LJPCuX5n/t
    nqcEWfWoyAc6wnVLffxkvx7toD7nMl7+2/LsUgSiY/QFdG43dKs+5rXuEOOwcZV/
    tLdivN9SEN44mEECQQDXls/rpMPYnd0IHHqh6YZEA3dH1CZAWeW/4XF/BINW/02m
    jtoNr+sTcZN9ekaLFTQnF/jJRi35dNwGhroG+k/hAkEAxST9oYDugGPTbu81JU1p
    nO8tLQPHvpVu3lGQEFahWZi6j70FlhNEhX74lDLrhvTOI4ohzHX28pU5TbQkiyl/
    SwJBALxQseHmFGR80HurVLtlnrB+TozhlWAUpolLRbZrnMY7T/qzQWk/Rxm+1dR/
    IGuQ4/NaDyjRMot6Nk9FE+3QbEECQQCXib+MDVdHSXSUqTro2YB9KTxIhcdcL/Fw
    4rEiXfTYshV1t447tcPN+bOJ9zokGrj5iIxCZcrU3O+XUwlkDxnRAkArwYiJZFlS
    Lu9zj+e03+kGWu6c/x8RRoLqfZcWFffBZlkxOHa06aN6jYCdJtRON43JUbynMvDY
    l5glkcwnZlbi
    -----END PRIVATE KEY-----`

    jse.setPrivateKey(privKey);
    let data = jse.decrypt(params); //解密
    
    return data;
}　

 五、使用rsa加解密过程中会出现待加密和待解密字符串过长情况，需要用到分段加解密

需要进入依赖包中修改jsencrypt.js 文件中方法，具体方法如下：　

//分段加密
    JSEncrypt.prototype.encryptLong = function (string){
        var k = this.getKey();
        // var maxLength = (((k.n.bitLength() + 7) >> 3) - 11);//117
        try {
            var lt = "";
            var ct = "";
            //RSA每次加密117bytes，需要辅助方法判断字符串截取位置
            //1.获取字符串截取点
            var bytes = new Array();
            bytes.push(0);
            var byteNo = 0;
            var len, c;
            len = string.length;
            var temp = 0;
            for (var i = 0; i < len; i++) {
                c = string.charCodeAt(i);
                if (c >= 0x010000 && c <= 0x10FFFF) {
                    byteNo += 4;
                } else if (c >= 0x000800 && c <= 0x00FFFF) {
                    byteNo += 3;
                } else if (c >= 0x000080 && c <= 0x0007FF) {
                    byteNo += 2;
                } else {
                    byteNo += 1;
                }
                if ((byteNo % 117) >= 114 || (byteNo % 117) == 0) {
                    if (byteNo - temp >= 114) {
                        bytes.push(i);
                        temp = byteNo;
                    }
                }
            }
            //2.截取字符串并分段加密
            if (bytes.length > 1) {
                for (var i = 0; i < bytes.length - 1; i++) {
                    var str;
                    if (i == 0) {
                        str = string.substring(0, bytes[i + 1] + 1);
                    } else {
                        str = string.substring(bytes[i] + 1, bytes[i + 1] + 1);
                    }
                    var t1 = k.encrypt(str);
                    ct += t1;
                };
                if (bytes[bytes.length - 1] != string.length - 1) {
                    var lastStr = string.substring(bytes[bytes.length - 1] + 1);
                    ct += k.encrypt(lastStr);
                    // debugger;
                }
                return hex2b64(ct);
            }
            var t = k.encrypt(string);
            var y = hex2b64(t);
            return y;
    
        } catch (ex) {
          return false;
        }
      }

//分段解密长字符串
    JSEncrypt.prototype.decryptLong = function (text) {
        // Return the decrypted string.
        // console.log(this);
        var k = this.getKey();
        var maxLength = ((k.n.bitLength() + 7) >> 3);
        try {
            var str = b64tohex(text);
            //var b=hex2Bytes(str);

            var inputLen = str.length;

            var ct = "";
           
            if (inputLen > maxLength) {

                var lt = str.match(/.{1,256}/g);
                lt.forEach(function (entry) {
                    var t1 = k.decrypt(entry);
                    ct += t1;
                });
                return ct;
            }
            var y = k.decrypt(b64tohex(string));
            return y;
            }
        catch (ex) {
            return false;
        }
    };

　如果使用分段加密，别忘记修改jsencryptKey.js中引用的加解密方法

六、在公共请求js中引入方法并调用

备注：使用rsa对大段接口参数进行加解密会大大降低接口请求及回调速度，不建议使用，推荐使用AES非对称加解密，稍后会整理发出来