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 
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：
{
string encodeString = MyRSA.Encrypt("1234567");
Console.WriteLine(encodeString);
string decode = MyRSA.Decrypt(encodeString);
Console.WriteLine(decode);
Console.ReadLine();
}
