asp.net的DES加密解密

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region ========加密========

/// 


/// DES 加密(数据加密标准，速度较快，适用于加密大量数据的场合)

/// 

/// 待加密的密文

/// 加密的密钥

/// returns

public static string DESEncrypt(string EncryptString, string EncryptKey)
{

    if (string.IsNullOrEmpty(EncryptString)) { throw (new Exception("密文不得为空")); }



    if (string.IsNullOrEmpty(EncryptKey)) { throw (new Exception("密钥不得为空")); }



    if (EncryptKey.Length != 8) { throw (new Exception("密钥必须为8位")); }



    byte[] m_btIV = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };



    string m_strEncrypt = "";



    DESCryptoServiceProvider m_DESProvider = new DESCryptoServiceProvider();



    try
    {

        byte[] m_btEncryptString = Encoding.Default.GetBytes(EncryptString);



        MemoryStream m_stream = new MemoryStream();



        CryptoStream m_cstream = new CryptoStream(m_stream, m_DESProvider.CreateEncryptor(Encoding.Default.GetBytes(EncryptKey), m_btIV), CryptoStreamMode.Write);



        m_cstream.Write(m_btEncryptString, 0, m_btEncryptString.Length);



        m_cstream.FlushFinalBlock();



        m_strEncrypt = Convert.ToBase64String(m_stream.ToArray());



        m_stream.Close(); m_stream.Dispose();



        m_cstream.Close(); m_cstream.Dispose();

    }

    catch (IOException ex) { throw ex; }

    catch (CryptographicException ex) { throw ex; }

    catch (ArgumentException ex) { throw ex; }

    catch (Exception ex) { throw ex; }

    finally { m_DESProvider.Clear(); }



    return m_strEncrypt;

}

#endregion

#region ========加密========
/// 


/// DES 解密(数据加密标准，速度较快，适用于加密大量数据的场合)

/// 

/// 待解密的密文

/// 解密的密钥

/// returns

public static string DESDecrypt(string DecryptString, string DecryptKey)
{

    if (string.IsNullOrEmpty(DecryptString)) { throw (new Exception("密文不得为空")); }



    if (string.IsNullOrEmpty(DecryptKey)) { throw (new Exception("密钥不得为空")); }



    if (DecryptKey.Length != 8) { throw (new Exception("密钥必须为8位")); }



    byte[] m_btIV = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };



    string m_strDecrypt = "";



    DESCryptoServiceProvider m_DESProvider = new DESCryptoServiceProvider();



    try
    {

        byte[] m_btDecryptString = Convert.FromBase64String(DecryptString);



        MemoryStream m_stream = new MemoryStream();



        CryptoStream m_cstream = new CryptoStream(m_stream, m_DESProvider.CreateDecryptor(Encoding.Default.GetBytes(DecryptKey), m_btIV), CryptoStreamMode.Write);



        m_cstream.Write(m_btDecryptString, 0, m_btDecryptString.Length);



        m_cstream.FlushFinalBlock();



        m_strDecrypt = Encoding.Default.GetString(m_stream.ToArray());



        m_stream.Close(); m_stream.Dispose();



        m_cstream.Close(); m_cstream.Dispose();

    }

    catch (IOException ex) { throw ex; }

    catch (CryptographicException ex) { throw ex; }

    catch (ArgumentException ex) { throw ex; }

    catch (Exception ex) { throw ex; }

    finally { m_DESProvider.Clear(); }



    return m_strDecrypt;

}
#endregion