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   源码介绍

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Des加密

if (string.IsNullOrEmpty(EncryptString))
            {
                throw (new Exception(明文不得为空！));
            }
            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 (ArgumentException ex)
            {
                throw ex;
            }
            catch (CryptographicException ex)
            {
                throw ex;
            }
            catch (Exception ex)
            {
                throw ex;
            }
            finally
            {
                m_DESProvider.Clear();
            }

            return m_strEncrypt;



 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 (ArgumentException ex)
            {
                throw ex;
            }
            catch (CryptographicException ex)
            {
                throw ex;
            }
            catch (Exception ex)
            {
                throw ex;
            }
            finally
            {
                m_DESProvider.Clear();
            }

            return m_strDecrypt;