数据包加密解密

private static byte[] Keys = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };//密钥
private static string key = "caijinhao";//密匙
#region DES加密字符串
///<summary>
///DES加密字符串
///</summary>
///<param name="str">待加密的字符串</param>
///<param name="key">加密密钥,要求为8位</param>
///<returns>加密成功返回加密后的字符串，失败返回源字符串</returns>
public static string EncryptDES(string str)
{
try
{
byte[] rgbKey = Encoding.UTF8.GetBytes(key.Substring(0, 8));
byte[] rgbIV = Keys;
byte[] inputByteArray = Encoding.UTF8.GetBytes(str);
DESCryptoServiceProvider myDES = new DESCryptoServiceProvider();
MemoryStream MStream = new MemoryStream();
CryptoStream CStream = new CryptoStream(MStream, myDES.CreateEncryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
CStream.Write(inputByteArray, 0, inputByteArray.Length);
CStream.FlushFinalBlock();
return Convert.ToBase64String(MStream.ToArray());
}
catch
{
return str;
}
}
#endregion

#region DES解密字符串

///<summary>
///DES解密字符串
///</summary>
///<param name="str">待解密的字符串</param>
///<param name="key">解密密钥,要求为8位,和加密密钥相同</param>
///<returns>解密成功返回解密后的字符串，失败返源字符串</returns>
public static string DecryptDES(string str)
{
try
{
byte[] rgbKey = Encoding.UTF8.GetBytes(key);
byte[] rgbIV = Keys;
byte[] inputByteArray = Convert.FromBase64String(str);
DESCryptoServiceProvider myDES = new DESCryptoServiceProvider();
MemoryStream MStream = new MemoryStream();
CryptoStream CStream = new CryptoStream(MStream, myDES.CreateDecryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
CStream.Write(inputByteArray, 0, inputByteArray.Length);
CStream.FlushFinalBlock();
return Encoding.UTF8.GetString(MStream.ToArray());
}
catch
{
return str;
}
}
#endregion