C# 常用公共方法

6.AES对称加密

 /// <summary>
 /// 对称加密类
 /// </summary>
 public class AES
 {
  /// <summary>
  /// 解密
  /// </summary>
  /// <param name="strDecrypt"></param>
  /// <param name="strKey"></param>
  /// <returns></returns>
  public static string Decrypt(string strDecrypt, string strKey)
  {
   try
   {
    byte[] bytes = Encoding.UTF8.GetBytes(FormsAuthentication.HashPasswordForStoringInConfigFile(strKey, "md5"));
    byte[] inputBuffer = Convert.FromBase64String(strDecrypt);
    byte[] buffer3 = null;
    using (RijndaelManaged managed = new RijndaelManaged())
    {
     managed.Key = bytes;
     managed.Mode = CipherMode.ECB;
     managed.Padding = PaddingMode.PKCS7;
     buffer3 = managed.CreateDecryptor().TransformFinalBlock(inputBuffer, 0, inputBuffer.Length);
    }
    return Encoding.UTF8.GetString(buffer3);
   }
   catch
   {
    return null;
   }
  }

  /// <summary>
  /// 解密
  /// </summary>
  /// <param name="strDecrypt"></param>
  /// <param name="strKey"></param>
  /// <returns></returns>
  public static string Decrypt(string toDecrypt, string key, string iv)
  {
   byte[] bytes = Encoding.UTF8.GetBytes(key);
   byte[] buffer2 = Encoding.UTF8.GetBytes(iv);
   byte[] inputBuffer = Convert.FromBase64String(toDecrypt);
   RijndaelManaged managed = new RijndaelManaged
   {
    Key = bytes,
    IV = buffer2,
    Mode = CipherMode.CBC,
    Padding = PaddingMode.Zeros
   };
   byte[] buffer4 = managed.CreateDecryptor().TransformFinalBlock(inputBuffer, 0, inputBuffer.Length);
   return Encoding.UTF8.GetString(buffer4);
  }

  public static string DecryptStr(string EncryptString)
  {
   string str = "";
   if (!string.IsNullOrEmpty(EncryptString))
   {
    string sSource = Decrypt(EncryptString, "cn.solefu");
    if (Utility.Left(sSource, 3) == "gk_")
    {
     str = sSource.Substring(3);
    }
   }
   return str;
  }

  public static string DecryptStrByCBC(string EncryptString)
  {
   string str = "";
   if (!string.IsNullOrEmpty(EncryptString))
   {
    string sSource = Decrypt(EncryptString, "cn.solefu", "cn.solefu");
    if (Utility.Left(sSource, 3) == "gk_")
    {
     str = sSource.Substring(3);
    }
   }
   return str;
  }

  /// <summary>
  /// 加密
  /// </summary>
  /// <param name="strEncrypt"></param>
  /// <param name="strKey"></param>
  /// <returns></returns>
  public static string Encrypt(string strEncrypt, string strKey)
  {
   try
   {
    byte[] bytes = Encoding.UTF8.GetBytes(FormsAuthentication.HashPasswordForStoringInConfigFile(strKey, "md5"));
    byte[] inputBuffer = Encoding.UTF8.GetBytes(strEncrypt);
    byte[] inArray = null;
    using (RijndaelManaged managed = new RijndaelManaged())
    {
     managed.Key = bytes;
     managed.Mode = CipherMode.ECB;
     managed.Padding = PaddingMode.PKCS7;
     inArray = managed.CreateEncryptor().TransformFinalBlock(inputBuffer, 0, inputBuffer.Length);
    }
    return Convert.ToBase64String(inArray, 0, inArray.Length);
   }
   catch
   {
    return null;
   }
  }

  /// <summary>
  /// 加密
  /// </summary>
  /// <param name="strEncrypt"></param>
  /// <param name="strKey"></param>
  /// <returns></returns>
  public static string Encrypt(string toEncrypt, string key, string iv)
  {
   byte[] bytes = Encoding.UTF8.GetBytes(key);
   byte[] buffer2 = Encoding.UTF8.GetBytes(iv);
   byte[] inputBuffer = Encoding.UTF8.GetBytes(toEncrypt);
   RijndaelManaged managed = new RijndaelManaged
   {
    Key = bytes,
    IV = buffer2,
    Mode = CipherMode.CBC,
    Padding = PaddingMode.Zeros
   };
   byte[] inArray = managed.CreateEncryptor().TransformFinalBlock(inputBuffer, 0, inputBuffer.Length);
   return Convert.ToBase64String(inArray, 0, inArray.Length);
  }

  public static string EncryptStr(string SourceString)
  {
   return Encrypt("gk_" + SourceString, "cn.solefu");
  }

  public static string EncryptStr(string SourceString, bool UseInUrl)
  {
   return HttpUtility.UrlEncode(EncryptStr(SourceString));
  }

  public static string EncryptStrByCBC(string SourceString)
  {
   return Encrypt("gk_" + SourceString, "cn.solefu", "cn.solefu");
  }

  public static string EncryptStrByCBC(string SourceString, bool UseInUrl)
  {
   return HttpUtility.UrlEncode(EncryptStrByCBC(SourceString));
  }
 }

								 
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