C#RSA非对称加解密

  1 using System;
  2 using System.Collections.Generic;
  3 using System.Linq;
  4 using System.Web;
  5 using System.Security.Cryptography;
  6 using System.Text;
  7 using System.Globalization;
  8 using System.IO;
  9 
 10 /// <summary>
 11 ///RSA 的摘要说明
 12 /// </summary>
 13 public class RSA
 14 {
 15  public RSA()
 16  {
 17   //
 18   //TODO: 在此处添加构造函数逻辑
 19   //
 20 
 21  }
 22  #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
 23 
 24  //public static RSACryptoServiceProvider rsa;
 25  //static byte[] cipherbytes;//密码字节
 26  //static string PublicAndPrivateKey = null; //私鈅变量
 27  //static string PublicKey = null; //公钥变量
 28 
 29  static RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
 30  //static RSAParameters rsaParamsExcludePrivate = rsa.ExportParameters(false);
 31  //static RSAParameters rsaParamsIncludePrivate = rsa.ExportParameters(true);
 32 
 33  static string PPKey; //私鈅变量
 34  static string PKey; //公钥变量
 35 
 36 
 37  private static void CreateRSAcsp()
 38  {
 39    //实例化CspParameters对象
 40 
 41    CspParameters cspPara = new CspParameters();
 42 
 43    //指定CspParameters对象实例的名称
 44 
 45    cspPara.KeyContainerName = "key_container_test";
 46 
 47    //设置密钥类型为Exchange
 48 
 49    cspPara.KeyNumber = 1;
 50 
 51    //设置密钥容器保存到计算机密钥库（默认为用户密钥库）
 52 
 53    cspPara.Flags = CspProviderFlags.UseMachineKeyStore;
 54 
 55    //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，
 56 
 57    //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；
 58 
 59    //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
 60 
 61    //RSACryptoServiceProvider rsaPro = new RSACryptoServiceProvider(cspPara);
 62 
 63    rsa = new RSACryptoServiceProvider(cspPara);
 64  }
 65 
 66 
 67  /// <summary>
 68  /// RSA加密
 69  /// </summary>
 70  /// <param name="EnStr">要加密的字符串</param>
 71  /// <returns></returns>
 72  public static string RSAEncrypt1(string EnStr)
 73  {
 74   
 75   CreateRSAcsp();
 76   RSACryptoServiceProvider _rsa = new RSACryptoServiceProvider();  
 77   _rsa.ImportParameters(rsa.ExportParameters(false));//导入公钥  
 78   byte[] byteData = Encoding.UTF8.GetBytes(EnStr);
 79   byte[] EncryptedData = rsa.Encrypt(byteData, false);
 80   string result = BitConverter.ToString(EncryptedData);
 81   return result;
 82  }
 83 
 84  /// <summary>
 85  /// RSA解密
 86  /// </summary>
 87  /// <param name="EeStr">要解密密的字符串</param>
 88  /// <returns></returns>
 89  public static string RSADecrypt1(string EeStr)
 90  {
 91   
 92   string[] sInput = EeStr.Split("-".ToCharArray());
 93   byte[] data = new byte[sInput.Length];
 94   for (int i = 0; i < sInput.Length; i++)
 95   {
 96    data[i] = byte.Parse(sInput[i], NumberStyles.HexNumber);
 97   }
 98   CreateRSAcsp();
 99   rsa.ImportParameters(rsa.ExportParameters(true)); //导入私钥
100   byte[] DecryptedData = rsa.Decrypt(data, false);
101   string str = string.Empty;
102   str = Encoding.UTF8.GetString(DecryptedData);
103   return str;
104  }
105 
106  #endregion
107  
108 }