Js参数RSA加密传输，jsencrypt.js的使用

ゞ浴缸里的玫瑰 2022-06-11 07:17 135阅读 0赞

### https://github.com/travist/jsencrypt    ###

### 注意几点： ###

1、参数传递的+号处理，在传输时会把+变成空格，不处理后端就报错了。

1、前端代码

<!DOCTYPE html>
    
    <html>
    <head>
        <meta name="viewport" content="width=device-width" />
        <title>Login</title>
        <script src="~/Scripts/jquery-1.10.2.min.js"></script>
        <script src="http://passport.cnblogs.com/scripts/jsencrypt.min.js"></script>
        <script type="text/javascript">
            $(function () {
                var encrypt = new JSEncrypt();
                encrypt.setPublicKey($("#tra").val());
                var data = encrypt.encrypt("123456789");
                alert(data);
                $("#btn").click(function () {
                    $.ajax({
                        url: '@Url.Action("Login")',
                        data: "pwd=" + encodeURI(data).replace(/\+/g, '%2B'),  //+号的处理：因为数据在网络上传输时，非字母数字字符都将被替换成百分号（%）后跟两位十六进制数，而base64编码在传输到后端的时候，+会变成空格，因此先替换掉。后端再替换回来
                        type: 'post',
                        success: function (msg) {
                            alert(msg);
                        }
                    });
                });
    
            });
    
    
        </script>
    </head>
    <body>
        <div>
            <input type="button" id="btn" value="点我" />
            <textarea id="tra" rows="15" cols="65">
                MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCa4KHNwDX44gGmmIAtRu4gjVYt
    GWZzcm4t+1wjUD4dn7fMLPvuK7ai4UrfDeEJE1RPwudJw+lJ6crql8wSIg7/DbTl
                G3ihsCT6dT9H5B9OoeR7K9VWUesaW/iyVL6HXiYOANabW14pvJATDmdq91Tfgp6P
                SQyvdfiRdV4r07crpQIDAQAB
            </textarea>
            <hr/>
            注意+好的处理
        </div>
    </body>
    </html>

### 2、后端代码 ###

public class IndexController : Controller
        {
            public ActionResult Login()
            {
                return View();
            }
    
            [HttpPost]
            public ActionResult Login(string pwd)
            {
                //密钥格式要生成pkcs#1格式的   而不是pkcs#8格式的
                string privateKey = @"MIICWwIBAAKBgQCa4KHNwDX44gGmmIAtRu4gjVYtGWZzcm4t+1wjUD4dn7fMLPvuK7ai4UrfDeEJE1RPwudJw+lJ6crql8wSIg7/DbTlG3ihsCT6dT9H5B9OoeR7K9VW
    UesaW/iyVL6HXiYOANabW14pvJATDmdq91Tfgp6PSQyvdfiRdV4r07crpQIDAQAB
    AoGABb+3gdb+qeG0b1CogVsT/7//UOaTzPk/FGneKQQTf4SsN+H7lVhTYTG9ARFC
    JyoWg8IXqmn2ljhywHPTWWD2RCZIn2sYT1sVkGb70EgHGQLBraFHElmw+DsVJ+nD
    fBCfMrJ1TYXlwigjRkaueaoGgG8LdR8XD+Xs5LersPLjZgECQQCguSB7C4wF6oSw
    EDmwNF8ffT5cQc1U2OIq6NBG8rafrjb7LsjhOd03pmY7i4LbW3Vvq4AhQpJEdF1C
    vd+Sk/BBAkEA9rBhqnyumV09zFEomSX3zZu+bdhTzM4bJDfEa95swp1gANCVvF/t
    DCnlBf51EhCWdeGSpARPUkQnXrYfFUDiZQJAAZEshuaa6+fYeVr/JP+tucHf3Mhr
    dxtSQTbZ6QcuzqnFMXfIT6HfzU4bCxOWKAthPsB+VFSw1mgIDMGLL4OvwQJAJlVy
    V9PYLezXVZCnBmVoBINXLCqZmxHMFey0kS6XKAbcjEPdgNBHPcSk2jGYb540Q00y
    RFqHGPmORKF4Yw0aIQJAd5JRtD3z2MgP/vPoKHJNHqY8bboVcmwqVAm6xCZoTCZz
    jNV1Cnsdf4wBV3LCDzYBy+xR4qYNUy5CFXN+8WzzAA==";
    
                try
                {
                    RSACryptoServiceProvider rsaCryptoServiceProvider = CreateRsaProviderFromPrivateKey(privateKey);
                    //把+号，再替换回来
                    byte[] res = rsaCryptoServiceProvider.Decrypt(Convert.FromBase64String(pwd.Replace("%2B","+")), false);
    
    
                    return Content(Encoding.UTF8.GetString(res));
                }
                catch (Exception exception)
                {
    
    
                }
    
                return Content("");
            }
            private RSACryptoServiceProvider CreateRsaProviderFromPrivateKey(string privateKey)
            {
                var privateKeyBits = System.Convert.FromBase64String(privateKey);
    
                var RSA = new RSACryptoServiceProvider();
                var RSAparams = new RSAParameters();
    
                using (BinaryReader binr = new BinaryReader(new MemoryStream(privateKeyBits)))
                {
                    byte bt = 0;
                    ushort twobytes = 0;
                    twobytes = binr.ReadUInt16();
                    if (twobytes == 0x8130)
                        binr.ReadByte();
                    else if (twobytes == 0x8230)
                        binr.ReadInt16();
                    else
                        throw new Exception("Unexpected value read binr.ReadUInt16()");
    
                    twobytes = binr.ReadUInt16();
                    if (twobytes != 0x0102)
                        throw new Exception("Unexpected version");
    
                    bt = binr.ReadByte();
                    if (bt != 0x00)
                        throw new Exception("Unexpected value read binr.ReadByte()");
    
                    RSAparams.Modulus = binr.ReadBytes(GetIntegerSize(binr));
                    RSAparams.Exponent = binr.ReadBytes(GetIntegerSize(binr));
                    RSAparams.D = binr.ReadBytes(GetIntegerSize(binr));
                    RSAparams.P = binr.ReadBytes(GetIntegerSize(binr));
                    RSAparams.Q = binr.ReadBytes(GetIntegerSize(binr));
                    RSAparams.DP = binr.ReadBytes(GetIntegerSize(binr));
                    RSAparams.DQ = binr.ReadBytes(GetIntegerSize(binr));
                    RSAparams.InverseQ = binr.ReadBytes(GetIntegerSize(binr));
                }
    
                RSA.ImportParameters(RSAparams);
                return RSA;
            }
            private int GetIntegerSize(BinaryReader binr)
            {
                byte bt = 0;
                byte lowbyte = 0x00;
                byte highbyte = 0x00;
                int count = 0;
                bt = binr.ReadByte();
                if (bt != 0x02)
                    return 0;
                bt = binr.ReadByte();
    
                if (bt == 0x81)
                    count = binr.ReadByte();
                else
                    if (bt == 0x82)
                    {
                        highbyte = binr.ReadByte();
                        lowbyte = binr.ReadByte();
                        byte[] modint = { lowbyte, highbyte, 0x00, 0x00 };
                        count = BitConverter.ToInt32(modint, 0);
                    }
                    else
                    {
                        count = bt;
                    }
    
                while (binr.ReadByte() == 0x00)
                {
                    count -= 1;
                }
                binr.BaseStream.Seek(-1, SeekOrigin.Current);
                return count;
            }
        }