Ajax前端加密.Net后台解密

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引用以下两个js文件

<script type="text/javascript" src="https://www.idaobin.com/test/jquery-3.2.1.js"></script>
<script type="text/javascript" src="https://www.idaobin.com/test/jsencrypt.min.js"></script>

加密ajax传输的密码字段

$(document).ready(function () {
    $("#submit").click(function () {
    //公钥
     var pubKey = "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCAnNXR7lHTpPH/97QOxIp+UusK9/RH5elvEPv6ssL37xGo8vQHh7CCsOonUWWVdi1iVegi7fRCkWeUVlta61EuX141+eKnZcdJe81NeUZ1h3N77JbzElbhhi8Wln6U27xpfkskKASLhQ4dS9DqoJQN/YUhBaBpER287Wjf3X6WmQIDAQAB";
        var encrypt = new JSEncrypt();
        encrypt.setPublicKey(pubKey);

        var userName = $("#userName").val();
        var pwd = $("#userPwd").val();
        if (userName == "") {
            alert("用户名不能为空");
        }
        else if (pwd == "") {
            alert("密码不能为空");
        }
        else {
            $.ajax({
                type: 'Post',
                url: 'login.aspx',
                data: {
                    userName: userName,
                    pwd: encrypt.encrypt(pwd), //加密密码
                    op: "login"
                },
                dataType: 'text',
                success: function (succ) {
                    if (succ === "登录成功") {
                        window.location.href = "/main.aspx";
                    }
                    else {
                        alert("登录失败");
                    }
                }
            });
        }
    });
});

.Net后台加解密类

public class RSACryptoService
    {
        /// <summary>
        /// 私钥
        /// </summary>
        private const string defaultprivateKey = @"MIICXAIBAAKBgQCAnNXR7lHTpPH/97QOxIp+UusK9/RH5elvEPv6ssL37xGo8vQH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";

        /// <summary>
        /// 公钥
        /// </summary>
        private const string defaultpublicKey = @"MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCAnNXR7lHTpPH/97QOxIp+UusK
9/RH5elvEPv6ssL37xGo8vQHh7CCsOonUWWVdi1iVegi7fRCkWeUVlta61EuX141
+eKnZcdJe81NeUZ1h3N77JbzElbhhi8Wln6U27xpfkskKASLhQ4dS9DqoJQN/YUh
BaBpER287Wjf3X6WmQIDAQAB";

        private RSACryptoServiceProvider _privateKeyRsaProvider;
        private RSACryptoServiceProvider _publicKeyRsaProvider;

        public RSACryptoService(string privateKey = "", string publicKey = "")
        {

            if (string.IsNullOrEmpty(privateKey))
            {
                privateKey = defaultprivateKey;
            }
            if (string.IsNullOrEmpty(publicKey))
            {
                publicKey = defaultpublicKey;
            }

            if (!string.IsNullOrEmpty(privateKey))
            {
                _privateKeyRsaProvider = CreateRsaProviderFromPrivateKey(privateKey);
            }

            if (!string.IsNullOrEmpty(publicKey))
            {
                _publicKeyRsaProvider = CreateRsaProviderFromPublicKey(publicKey);
            }
        }
        /// <summary>
        /// 解密
        /// </summary>
        /// <param name="cipherText"></param>
        /// <returns></returns>
        public string Decrypt(string cipherText)
        {
            if (_privateKeyRsaProvider == null)
            {
                throw new Exception("_privateKeyRsaProvider is null");
            }

            if (string.IsNullOrEmpty(cipherText))
            {
                return "";
            }

            return Encoding.UTF8.GetString(_privateKeyRsaProvider.Decrypt(System.Convert.FromBase64String(cipherText), false));
        }
        /// <summary>
        /// 加密
        /// </summary>
        /// <param name="text"></param>
        /// <returns></returns>
        public string Encrypt(string text)
        {
            if (_publicKeyRsaProvider == null)
            {
                throw new Exception("_publicKeyRsaProvider is null");
            }
            return Convert.ToBase64String(_publicKeyRsaProvider.Encrypt(Encoding.UTF8.GetBytes(text), false));
        }

        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;
        }

        private RSACryptoServiceProvider CreateRsaProviderFromPublicKey(string publicKeyString)
        {
            // encoded OID sequence for  PKCS #1 rsaEncryption szOID_RSA_RSA = "1.2.840.113549.1.1.1"
            byte[] SeqOID = { 0x30, 0x0D, 0x06, 0x09, 0x2A, 0x86, 0x48, 0x86, 0xF7, 0x0D, 0x01, 0x01, 0x01, 0x05, 0x00 };
            byte[] x509key;
            byte[] seq = new byte[15];
            int x509size;

            x509key = Convert.FromBase64String(publicKeyString);
            x509size = x509key.Length;

            // ---------  Set up stream to read the asn.1 encoded SubjectPublicKeyInfo blob  ------
            using (MemoryStream mem = new MemoryStream(x509key))
            {
                using (BinaryReader binr = new BinaryReader(mem))  //wrap Memory Stream with BinaryReader for easy reading
                {
                    byte bt = 0;
                    ushort twobytes = 0;

                    twobytes = binr.ReadUInt16();
                    if (twobytes == 0x8130) //data read as little endian order (actual data order for Sequence is 30 81)
                        binr.ReadByte();    //advance 1 byte
                    else if (twobytes == 0x8230)
                        binr.ReadInt16();   //advance 2 bytes
                    else
                        return null;

                    seq = binr.ReadBytes(15);       //read the Sequence OID
                    if (!CompareBytearrays(seq, SeqOID))    //make sure Sequence for OID is correct
                        return null;

                    twobytes = binr.ReadUInt16();
                    if (twobytes == 0x8103) //data read as little endian order (actual data order for Bit String is 03 81)
                        binr.ReadByte();    //advance 1 byte
                    else if (twobytes == 0x8203)
                        binr.ReadInt16();   //advance 2 bytes
                    else
                        return null;

                    bt = binr.ReadByte();
                    if (bt != 0x00)     //expect null byte next
                        return null;

                    twobytes = binr.ReadUInt16();
                    if (twobytes == 0x8130) //data read as little endian order (actual data order for Sequence is 30 81)
                        binr.ReadByte();    //advance 1 byte
                    else if (twobytes == 0x8230)
                        binr.ReadInt16();   //advance 2 bytes
                    else
                        return null;

                    twobytes = binr.ReadUInt16();
                    byte lowbyte = 0x00;
                    byte highbyte = 0x00;

                    if (twobytes == 0x8102) //data read as little endian order (actual data order for Integer is 02 81)
                        lowbyte = binr.ReadByte();  // read next bytes which is bytes in modulus
                    else if (twobytes == 0x8202)
                    {
                        highbyte = binr.ReadByte(); //advance 2 bytes
                        lowbyte = binr.ReadByte();
                    }
                    else
                        return null;
                    byte[] modint = { lowbyte, highbyte, 0x00, 0x00 };   //reverse byte order since asn.1 key uses big endian order
                    int modsize = BitConverter.ToInt32(modint, 0);

                    int firstbyte = binr.PeekChar();
                    if (firstbyte == 0x00)
                    {   //if first byte (highest order) of modulus is zero, don't include it
                        binr.ReadByte();    //skip this null byte
                        modsize -= 1;   //reduce modulus buffer size by 1
                    }

                    byte[] modulus = binr.ReadBytes(modsize);   //read the modulus bytes

                    if (binr.ReadByte() != 0x02)            //expect an Integer for the exponent data
                        return null;
                    int expbytes = (int)binr.ReadByte();        // should only need one byte for actual exponent data (for all useful values)
                    byte[] exponent = binr.ReadBytes(expbytes);

                    // ------- create RSACryptoServiceProvider instance and initialize with public key -----
                    RSACryptoServiceProvider RSA = new RSACryptoServiceProvider();
                    RSAParameters RSAKeyInfo = new RSAParameters();
                    RSAKeyInfo.Modulus = modulus;
                    RSAKeyInfo.Exponent = exponent;
                    RSA.ImportParameters(RSAKeyInfo);

                    return RSA;
                }

            }
        }

        private bool CompareBytearrays(byte[] a, byte[] b)
        {
            if (a.Length != b.Length)
                return false;
            int i = 0;
            foreach (byte c in a)
            {
                if (c != b[i])
                    return false;
                i++;
            }
            return true;
        }
    }

调用加解密类

RSACryptoService rsa = new RSACryptoService();
string pwd = rsa.Decrypt(Request["pwd"]); //解密
//string pwd = rsa.Encrypt(Request["pwd"]); //加密

注意:在线生成非对称加密公钥私钥对网址

密钥格式:必须为PKCS#1,证书密码:必须为空,否则无法解密

原文链接:https://www.idaobin.com/archives/1948.html

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