C#RSA非对称加解密

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Security.Cryptography;
using System.Text;
using System.Globalization;
using System.IO;

/// <summary>
///RSA 的摘要说明
/// </summary>
public class RSA
{
 public RSA()
 {
  //
  //TODO: 在此处添加构造函数逻辑
  //

 }
 #region RSA非对称加解密  密钥保存在密钥容器，密钥容器保存在计算机的密钥库中

 //public static RSACryptoServiceProvider rsa;
 //static byte[] cipherbytes;//密码字节
 //static string PublicAndPrivateKey = null; //私鈅变量
 //static string PublicKey = null; //公钥变量

 static RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
 //static RSAParameters rsaParamsExcludePrivate = rsa.ExportParameters(false);
 //static RSAParameters rsaParamsIncludePrivate = rsa.ExportParameters(true);

 static string PPKey; //私鈅变量
 static string PKey; //公钥变量


 private static void CreateRSAcsp()
 {
   //实例化CspParameters对象

   CspParameters cspPara = new CspParameters();

   //指定CspParameters对象实例的名称

   cspPara.KeyContainerName = "key_container_test";

   //设置密钥类型为Exchange

   cspPara.KeyNumber = 1;

   //设置密钥容器保存到计算机密钥库（默认为用户密钥库）

   cspPara.Flags = CspProviderFlags.UseMachineKeyStore;

   //实例化RSA对象的时候，将CspParameters对象作为构造函数的参数传递给RSA对象，

   //如果名称为key_container_test的密钥容器不存在，RSA对象会创建这个密钥容器；

   //如果名称为key_container_test的密钥容器已经存在，RSA对象会使用这个密钥容器中的密钥进行实例化

   //RSACryptoServiceProvider rsaPro = new RSACryptoServiceProvider(cspPara);

   rsa = new RSACryptoServiceProvider(cspPara);
 }


 /// <summary>
 /// RSA加密
 /// </summary>
 /// <param name="EnStr">要加密的字符串</param>
 /// <returns></returns>
 public static string RSAEncrypt1(string EnStr)
 {
  
  CreateRSAcsp();
  RSACryptoServiceProvider _rsa = new RSACryptoServiceProvider();  
  _rsa.ImportParameters(rsa.ExportParameters(false));//导入公钥  
  byte[] byteData = Encoding.UTF8.GetBytes(EnStr);
  byte[] EncryptedData = rsa.Encrypt(byteData, false);
  string result = BitConverter.ToString(EncryptedData);
  return result;
 }

 /// <summary>
 /// RSA解密
 /// </summary>
 /// <param name="EeStr">要解密密的字符串</param>
 /// <returns></returns>
 public static string RSADecrypt1(string EeStr)
 {
  
  string[] sInput = EeStr.Split("-".ToCharArray());
  byte[] data = new byte[sInput.Length];
  for (int i = 0; i < sInput.Length; i++)
  {
   data[i] = byte.Parse(sInput[i], NumberStyles.HexNumber);
  }
  CreateRSAcsp();
  rsa.ImportParameters(rsa.ExportParameters(true)); //导入私钥
  byte[] DecryptedData = rsa.Decrypt(data, false);
  string str = string.Empty;
  str = Encoding.UTF8.GetString(DecryptedData);
  return str;
 }

 #endregion
 
}