以下是加密代码，如何进行解密，求请教，没弄过，研究了几个钟没有头绪啊。
public static string EncryptDES(string message, string DES_KEY)
{
DES des = new DESCryptoServiceProvider();
des.Key = Encoding.UTF8.GetBytes(DES_KEY);
des.Mode = CipherMode.ECB;
byte[] bytes = Encoding.UTF8.GetBytes(message);
byte[] result = des.CreateEncryptor().TransformFinalBlock(bytes,0, bytes.Length);
SHA256 sha256 = new SHA256Managed();
byte[] buffer = sha256.ComputeHash(Encoding.ASCII.GetBytes(Convert.ToBase64String(result)));
StringBuilder sb = new StringBuilder();
foreach (byte by in buffer)
{
sb.AppendFormat("{0:x2}", by);
}
return sb.ToString();
}解密加密bufferbytestring
public static string EncryptDES(string message, string DES_KEY)
{
DES des = new DESCryptoServiceProvider();
des.Key = Encoding.UTF8.GetBytes(DES_KEY);
des.Mode = CipherMode.ECB;
byte[] bytes = Encoding.UTF8.GetBytes(message);
byte[] result = des.CreateEncryptor().TransformFinalBlock(bytes,0, bytes.Length);
SHA256 sha256 = new SHA256Managed();
byte[] buffer = sha256.ComputeHash(Encoding.ASCII.GetBytes(Convert.ToBase64String(result)));
StringBuilder sb = new StringBuilder();
foreach (byte by in buffer)
{
sb.AppendFormat("{0:x2}", by);
}
return sb.ToString();
}解密加密bufferbytestring
//默认密钥向量
private static string DESKey = "abcd";
private static byte[] Keys = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF }; /// <summary>
/// DES加密字符串
/// </summary>
/// <param name="encryptString">待加密的字符串</param>
/// <returns>加密成功返回加密后的字符串，失败返回源串</returns>
public static string DESEncrypt(string encryptString)
{
try
{
byte[] rgbKey = Encoding.UTF8.GetBytes(DESKey.Substring(0, 8));
byte[] rgbIV = Keys;
byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString); DESCryptoServiceProvider dCSP = new DESCryptoServiceProvider();
MemoryStream mStream = new MemoryStream();
CryptoStream cStream = new CryptoStream(mStream, dCSP.CreateEncryptor(rgbKey, rgbIV), CryptoStreamMode.Write); cStream.Write(inputByteArray, 0, inputByteArray.Length);
cStream.FlushFinalBlock(); return Convert.ToBase64String(mStream.ToArray());
}
catch
{
return encryptString;
}
} /// <summary>
/// DES解密字符串
/// </summary>
/// <param name="decryptString">待解密的字符串</param>
/// <returns>解密成功返回解密后的字符串，失败返源串</returns>
public static string DESDecrypt(string decryptString)
{
try
{
byte[] rgbKey = Encoding.UTF8.GetBytes(DESKey);
byte[] rgbIV = Keys;
byte[] inputByteArray = Convert.FromBase64String(decryptString); DESCryptoServiceProvider DCSP = new DESCryptoServiceProvider();
MemoryStream mStream = new MemoryStream();
CryptoStream cStream = new CryptoStream(mStream, DCSP.CreateDecryptor(rgbKey, rgbIV), CryptoStreamMode.Write); cStream.Write(inputByteArray, 0, inputByteArray.Length);
cStream.FlushFinalBlock(); return Encoding.UTF8.GetString(mStream.ToArray());
}
catch
{
return decryptString;
}
}