C#实现RSA加密和解密详解

项目要求，生成一个private key 和 public key ,用 Public Key 加密，用Private key 解密，我是这样实现的，

希望对有这方面需求朋友的一个帮助．

　　

　　源代码如下:

1.生成一对keys:

          /// <summary>
        /// generate private key and public key arr[0] for private key arr[1] for public key
        /// </summary>
        /// <returns></returns>
        public static string[] GenerateKeys()
        {
            string[] sKeys = new String[2];
            RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
            sKeys[0] = rsa.ToXmlString(true);
            sKeys[1] = rsa.ToXmlString(false);
            return sKeys;
        }　

2.加密:

      /// <summary>
        /// RSA Encrypt
        /// </summary>
       /// <param name="sSource" >Source string</param>
        /// <param name="sPublicKey" >public key</param>
        /// <returns></returns>
        public static  string EncryptString(string sSource,string sPublicKey)
        {
            RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
            string plaintext = sSource;
            rsa.FromXmlString(sPublicKey);
            byte[] cipherbytes;
            byte[] byteEn = rsa.Encrypt(Encoding.UTF8.GetBytes("a"), false);
            cipherbytes = rsa.Encrypt(Encoding.UTF8.GetBytes(plaintext), false);

            StringBuilder sbString = new StringBuilder();
            for (int i = 0; i < cipherbytes.Length; i++)
            {
                sbString.Append(cipherbytes[i] + ",");
            }

3. 解密：

　　　  /// <summary>
        /// RSA Decrypt
        /// </summary>
        /// <param name="sSource">Source string</param>
        /// <param name="sPrivateKey">Private Key</param>
        /// <returns></returns>
        public static string DecryptString(String sSource, string sPrivateKey)
        {
            RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
            rsa.FromXmlString(sPrivateKey);
            byte[] byteEn = rsa.Encrypt(Encoding.UTF8.GetBytes("a"), false);
            string[] sBytes = sSource.Split(',');

            for (int j = 0; j < sBytes.Length; j++)
            {
                if (sBytes[j] != "")
                {
                    byteEn[j] = Byte.Parse(sBytes[j]);
                }
            }
            byte[] plaintbytes = rsa.Decrypt(byteEn, false);
            return  Encoding.UTF8.GetString(plaintbytes);
        }
            return  sbString.ToString();
        }

--------------------------------------------------------------------

RSA加密解密源码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Security.Cryptography;

namespace MyRSA
{
publicclass MyRSA
...{

privatestaticstring publicKey =
"<RSAKeyValue><Modulus>6CdsXgYOyya/yQH"+
"TO96dB3gEurM2UQDDVGrZoe6RcAVTxAqDDf5L"+
"wPycZwtNOx3Cfy44/D5Mj86koPew5soFIz9sx"+
"PAHRF5hcqJoG+q+UfUYTHYCsMH2cnqGVtnQiE"+
"/PMRMmY0RwEfMIo+TDpq3QyO03MaEsDGf13sP"+
"w9YRXiac=</Modulus><Exponent>AQAB</Exponent></RSAKeyValue>";
privatestaticstring privateKey =
"<RSAKeyValue><Modulus>6CdsXgYOyya/yQH"+
"TO96dB3gEurM2UQDDVGrZoe6RcAVTxAqDDf5L"+
"wPycZwtNOx3Cfy44/D5Mj86koPew5soFIz9sx"+
"PAHRF5hcqJoG+q+UfUYTHYCsMH2cnqGVtnQiE"+
"/PMRMmY0RwEfMIo+TDpq3QyO03MaEsDGf13sP"+
"w9YRXiac=</Modulus><Exponent>AQAB</Exponent>"+
"<P>/aoce2r6tonjzt1IQI6FM4ysR40j/gKvt4d"+
"L411pUop1Zg61KvCm990M4uN6K8R/DUvAQdrRd"+
"VgzvvAxXD7ESw==</P><Q>6kqclrEunX/fmOle"+
"VTxG4oEpXY4IJumXkLpylNR3vhlXf6ZF9obEpG"+
"lq0N7sX2HBxa7T2a0WznOAb0si8FuelQ==</Q>"+
"<DP>3XEvxB40GD5v/Rr4BENmzQW1MBFqpki6FU"+
"GrYiUd2My+iAW26nGDkUYMBdYHxUWYlIbYo6Te"+
"zc3d/oW40YqJ2Q==</DP><DQ>LK0XmQCmY/ArY"+
"gw2Kci5t51rluRrl4f5l+aFzO2K+9v3PGcndjA"+
"StUtIzBWGO1X3zktdKGgCLlIGDrLkMbM21Q==</DQ><InverseQ>"+
"GqC4Wwsk2fdvJ9dmgYlej8mTDBWg0Wm6aqb5kjn"+
"cWK6WUa6CfD+XxfewIIq26+4Etm2A8IAtRdwPl4"+
"aPjSfWdA==</InverseQ><D>a1qfsDMY8DSxB2D"+
"Cr7LX5rZHaZaqDXdO3GC01z8dHjI4dDVwOS5ZFZ"+
"s7MCN3yViPsoRLccnVWcLzOkSQF4lgKfTq3IH40"+
"H5N4gg41as9GbD0g9FC3n5IT4VlVxn9ZdW+WQry"+
"oHdbiIAiNpFKxL/DIEERur4sE1Jt9VdZsH24CJE=</D></RSAKeyValue>";

staticpublicstring Decrypt(string base64code)
...{
try
...{

//Create a UnicodeEncoder to convert between byte array and string.
UnicodeEncoding ByteConverter =new UnicodeEncoding();

//Create a new instance of RSACryptoServiceProvider to generate
//public and private key data.
RSACryptoServiceProvider RSA =new RSACryptoServiceProvider();
RSA.FromXmlString(privateKey);

byte[] encryptedData;
byte[] decryptedData;
encryptedData = Convert.FromBase64String(base64code);

//Pass the data to DECRYPT, the private key information
//(using RSACryptoServiceProvider.ExportParameters(true),
//and a boolean flag specifying no OAEP padding.
decryptedData = RSADecrypt(
encryptedData, RSA.ExportParameters(true), false);

//Display the decrypted plaintext to the console.
return ByteConverter.GetString(decryptedData);
}
catch (Exception exc)
...{
//Exceptions.LogException(exc);
Console.WriteLine(exc.Message);
return"";
}
}

staticpublicstring Encrypt(string toEncryptString)
...{
try
...{
//Create a UnicodeEncoder to convert between byte array and string.
UnicodeEncoding ByteConverter =new UnicodeEncoding();

//Create byte arrays to hold original, encrypted, and decrypted data.
byte[] dataToEncrypt =
ByteConverter.GetBytes(toEncryptString);
byte[] encryptedData;
byte[] decryptedData;

//Create a new instance of RSACryptoServiceProvider to generate
//public and private key data.
RSACryptoServiceProvider RSA =new RSACryptoServiceProvider();

RSA.FromXmlString(privateKey);

//Pass the data to ENCRYPT, the public key information
//(using RSACryptoServiceProvider.ExportParameters(false),
//and a boolean flag specifying no OAEP padding.
encryptedData = RSAEncrypt(
dataToEncrypt, RSA.ExportParameters(false), false);

string base64code = Convert.ToBase64String(encryptedData);
return base64code;
}
catch (Exception exc)
...{
//Catch this exception in case the encryption did
//not succeed.
//Exceptions.LogException(exc);
Console.WriteLine(exc.Message);
return"";
}



}

staticprivatebyte[] RSAEncrypt(
byte[] DataToEncrypt,
RSAParameters RSAKeyInfo,
bool DoOAEPPadding)
...{
try
...{
//Create a new instance of RSACryptoServiceProvider.
RSACryptoServiceProvider RSA =new RSACryptoServiceProvider();

//Import the RSA Key information. This only needs
//toinclude the public key information.
RSA.ImportParameters(RSAKeyInfo);

//Encrypt the passed byte array and specify OAEP padding.
//OAEP padding is only available on Microsoft Windows XP or
//later.
return RSA.Encrypt(DataToEncrypt, DoOAEPPadding);
}
//Catch and display a CryptographicException
//to the console.
catch (CryptographicException e)
...{
//Exceptions.LogException(e);
Console.WriteLine(e.Message);

returnnull;
}

}

staticprivatebyte[] RSADecrypt(
byte[] DataToDecrypt,
RSAParameters RSAKeyInfo,
bool DoOAEPPadding)
...{
try
...{
//Create a new instance of RSACryptoServiceProvider.
RSACryptoServiceProvider RSA =new RSACryptoServiceProvider();

//Import the RSA Key information. This needs
//to include the private key information.
RSA.ImportParameters(RSAKeyInfo);

//Decrypt the passed byte array and specify OAEP padding.
//OAEP padding is only available on Microsoft Windows XP or
//later.
return RSA.Decrypt(DataToDecrypt, DoOAEPPadding);
}
//Catch and display a CryptographicException
//to the console.
catch (CryptographicException e)
...{
//Exceptions.LogException(e);
Console.WriteLine(e.Message);

returnnull;
}
}
}
}

namespace MyRSA

...{

publicclass MyRSA

...{



privatestaticstring publicKey =

    "<RSAKeyValue><Modulus>6CdsXgYOyya/yQH"+

    "TO96dB3gEurM2UQDDVGrZoe6RcAVTxAqDDf5L"+

    "wPycZwtNOx3Cfy44/D5Mj86koPew5soFIz9sx"+

    "PAHRF5hcqJoG+q+UfUYTHYCsMH2cnqGVtnQiE"+

    "/PMRMmY0RwEfMIo+TDpq3QyO03MaEsDGf13sP"+

    "w9YRXiac=</Modulus><Exponent>AQAB</Exponent></RSAKeyValue>";

privatestaticstring privateKey =

    "<RSAKeyValue><Modulus>6CdsXgYOyya/yQH"+

    "TO96dB3gEurM2UQDDVGrZoe6RcAVTxAqDDf5L"+

    "wPycZwtNOx3Cfy44/D5Mj86koPew5soFIz9sx"+

    "PAHRF5hcqJoG+q+UfUYTHYCsMH2cnqGVtnQiE"+

    "/PMRMmY0RwEfMIo+TDpq3QyO03MaEsDGf13sP"+

    "w9YRXiac=</Modulus><Exponent>AQAB</Exponent>"+

    "<P>/aoce2r6tonjzt1IQI6FM4ysR40j/gKvt4d"+

    "L411pUop1Zg61KvCm990M4uN6K8R/DUvAQdrRd"+

    "VgzvvAxXD7ESw==</P><Q>6kqclrEunX/fmOle"+

    "VTxG4oEpXY4IJumXkLpylNR3vhlXf6ZF9obEpG"+

    "lq0N7sX2HBxa7T2a0WznOAb0si8FuelQ==</Q>"+

    "<DP>3XEvxB40GD5v/Rr4BENmzQW1MBFqpki6FU"+

    "GrYiUd2My+iAW26nGDkUYMBdYHxUWYlIbYo6Te"+

    "zc3d/oW40YqJ2Q==</DP><DQ>LK0XmQCmY/ArY"+

    "gw2Kci5t51rluRrl4f5l+aFzO2K+9v3PGcndjA"+

    "StUtIzBWGO1X3zktdKGgCLlIGDrLkMbM21Q==</DQ><InverseQ>"+

    "GqC4Wwsk2fdvJ9dmgYlej8mTDBWg0Wm6aqb5kjn"+

    "cWK6WUa6CfD+XxfewIIq26+4Etm2A8IAtRdwPl4"+

    "aPjSfWdA==</InverseQ><D>a1qfsDMY8DSxB2D"+

    "Cr7LX5rZHaZaqDXdO3GC01z8dHjI4dDVwOS5ZFZ"+

    "s7MCN3yViPsoRLccnVWcLzOkSQF4lgKfTq3IH40"+

    "H5N4gg41as9GbD0g9FC3n5IT4VlVxn9ZdW+WQry"+

    "oHdbiIAiNpFKxL/DIEERur4sE1Jt9VdZsH24CJE=</D></RSAKeyValue>";



staticpublicstring Decrypt(string base64code)

...{

    try

    ...{



        //Create a UnicodeEncoder to convert between byte array and string.

        UnicodeEncoding ByteConverter =new UnicodeEncoding();



        //Create a new instance of RSACryptoServiceProvider to generate

        //public and private key data.

        RSACryptoServiceProvider RSA =new RSACryptoServiceProvider();

        RSA.FromXmlString(privateKey);



        byte[] encryptedData;

        byte[] decryptedData;

        encryptedData = Convert.FromBase64String(base64code);



        //Pass the data to DECRYPT, the private key information

        //(using RSACryptoServiceProvider.ExportParameters(true),

        //and a boolean flag specifying no OAEP padding.

        decryptedData = RSADecrypt(

            encryptedData, RSA.ExportParameters(true), false);



        //Display the decrypted plaintext to the console.

        return ByteConverter.GetString(decryptedData);

    }

    catch (Exception exc)

    ...{

        //Exceptions.LogException(exc);

        Console.WriteLine(exc.Message);

        return"";

    }

}



staticpublicstring Encrypt(string toEncryptString)

...{

    try

    ...{

        //Create a UnicodeEncoder to convert between byte array and string.

        UnicodeEncoding ByteConverter =new UnicodeEncoding();



        //Create byte arrays to hold original, encrypted, and decrypted data.

        byte[] dataToEncrypt =

            ByteConverter.GetBytes(toEncryptString);

        byte[] encryptedData;

        byte[] decryptedData;



        //Create a new instance of RSACryptoServiceProvider to generate

        //public and private key data.

        RSACryptoServiceProvider RSA =new RSACryptoServiceProvider();



        RSA.FromXmlString(privateKey);



        //Pass the data to ENCRYPT, the public key information

        //(using RSACryptoServiceProvider.ExportParameters(false),

        //and a boolean flag specifying no OAEP padding.

        encryptedData = RSAEncrypt(

            dataToEncrypt, RSA.ExportParameters(false), false);



        string base64code = Convert.ToBase64String(encryptedData);

        return base64code;

    }

    catch (Exception exc)

    ...{

        //Catch this exception in case the encryption did

        //not succeed.

        //Exceptions.LogException(exc);

        Console.WriteLine(exc.Message);

        return"";

    }







}



staticprivatebyte[] RSAEncrypt(

    byte[] DataToEncrypt,

    RSAParameters RSAKeyInfo,

    bool DoOAEPPadding)

...{

    try

    ...{

        //Create a new instance of RSACryptoServiceProvider.

        RSACryptoServiceProvider RSA =new RSACryptoServiceProvider();



        //Import the RSA Key information. This only needs

        //toinclude the public key information.

        RSA.ImportParameters(RSAKeyInfo);



        //Encrypt the passed byte array and specify OAEP padding. 

        //OAEP padding is only available on Microsoft Windows XP or

        //later. 

        return RSA.Encrypt(DataToEncrypt, DoOAEPPadding);

    }

    //Catch and display a CryptographicException 

    //to the console.

    catch (CryptographicException e)

    ...{

        //Exceptions.LogException(e);

        Console.WriteLine(e.Message);



        returnnull;

    }



}



staticprivatebyte[] RSADecrypt(

    byte[] DataToDecrypt,

    RSAParameters RSAKeyInfo,

    bool DoOAEPPadding)

...{

    try

    ...{

        //Create a new instance of RSACryptoServiceProvider.

        RSACryptoServiceProvider RSA =new RSACryptoServiceProvider();



        //Import the RSA Key information. This needs

        //to include the private key information.

        RSA.ImportParameters(RSAKeyInfo);



        //Decrypt the passed byte array and specify OAEP padding. 

        //OAEP padding is only available on Microsoft Windows XP or

        //later. 

        return RSA.Decrypt(DataToDecrypt, DoOAEPPadding);

    }

    //Catch and display a CryptographicException 

    //to the console.

    catch (CryptographicException e)

    ...{

        //Exceptions.LogException(e);

        Console.WriteLine(e.Message);



        returnnull;

    }

}

}

}
 测试代码：

        static void Main(string[] args)
        {
            string encodeString = MyRSA.Encrypt("1234567");
            Console.WriteLine(encodeString);


            string decode = MyRSA.Decrypt(encodeString);
            Console.WriteLine(decode);

            Console.ReadLine();
        }