Des Configuration

The component accepts one or more of the following configuration settings. Configuration settings are similar in functionality to properties, but they are rarely used. In order to avoid "polluting" the property namespace of the component, access to these internal properties is provided through the Config method.

DES Configuration Settings


	KeySize: The size, in bits, of secret key for the symmetric algorithm. The legal key sizes vary depending on the algorithm. The KeySize and BlockSize configuration settings may be set to specify the key and block size (in bits). This setting is only applicable when KeyPassword is specified. Note that when using the EzCrypt component, KeySize should be set after setting the Algorithm property.
	BlockSize: The block size, in bits, of the cryptographic operation. The block size is a basic data unit in the operation of encrypt or decrypt. Messages longer than the block size are seen as successive blocks. If the message is shorter than the block size, the message will be padded with extra bits to reach the block size according to PaddingMode. Different symmetric algorithm has different valid block sizes. The following algorithms have a fixed block size: AES, CAST, DES, IDEA, RC2, TripleDES, Blowfish, and Twofish.
	IncludeIV: Whether to prepend the IV to the output data and read the IV from the input data. If this config is true, the IV will be automatically prepended to the output data when calling Encrypt. When calling Decrypt and this setting is True, the IV is automatically extracted form the ciphertext. The default value is False.
	KeyPasswordAlgorithm: The hash algorithm used to derive the Key and IV from the KeyPassword property. This configuration setting specifies which hash algorithm will be used when deriving the Key and IV from KeyPassword. The default value is "MD5". Possible values are: "SHA1" "MD2" "MD5" (default) "HMAC-SHA1" "HMAC-SHA224" "HMAC-SHA256" "HMAC-SHA384" "HMAC-SHA512" "HMAC-MD5" "HMAC-RIPEMD160"
	KeyPasswordSalt: The salt value used in conjunction with the KeyPassword to derive the Key and IV. This configuration setting specifies the hex encoded salt value to be used along with the KeyPassword when calculating values for Key and IV.
	CloseInputStreamAfterProcessing: Determines whether or not the input stream is closed after processing. Determines whether or not the input stream set by SetInputStream is closed after processing is complete. The default value is True.
	CloseOutputStreamAfterProcessing: Determines whether or not the output stream is closed after processing. Determines whether or not the output stream set by SetOutputStream is closed after processing is complete. The default value is True.

Base Configuration Settings

GUIAvailable: Tells the component whether or not a message loop is available for processing events.

In a GUI-based application, long-running blocking operations may cause the application to stop responding to input until the operation returns. The component will attempt to discover whether or not the application has a message loop and, if one is discovered, it will process events in that message loop during any such blocking operation.

In some non-GUI applications an invalid message loop may be discovered that will result in errant behavior. In these cases, setting GuiAvailable to false will ensure that the component does not attempt to process external events.

UseDaemonThreads: Whether threads created by the component are daemon threads.

If set to True, when the component creates a thread the thread's Daemon property will be explicitly set to True. By default this setting is False and the component will not set the Daemon property on the created thread.