TEA ConfigurationThe control 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 control, access to these internal properties is provided through the Config method.
TEA Configuration Settings
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.|
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:
When using any HMAC algorithm the PBKDF#2 method from RFC 2898 is used. Any other algorithm uses PBKDF#1 from the same RFC.
|KeyPasswordIterations: The number of iterations performed when using KeyPassword to derive the Key and IV.This configuration setting specifies the number of iterations performed when using KeyPassword to calculate values for Key and IV. When using PBKDF#2 the default number of iterations is 10,000. When using PBKDF#1 the default number is 10.|
|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.|
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 control, KeySize should be set after setting the Algorithm property.
|TEARounds: The number of rounds for TEA and XTEA.This setting specifies the number of rounds used when Algorithm is set to 1 (taXTEA) or 2 (taTEA). The default value is 64. The number of rounds must be the same when encrypting and decrypting. This is not applicable when Algorithm is set to 0 (taXXTEA).|
The XTEA algorithm.The XTEA algorithm is ambiguously defined and as a result there are two possible versions of this algorithm.
For compatibility the control supports both. Possible values are:
Base Configuration Settings
The system code page used for Unicode to Multibyte translations.The default code page is Unicode UTF-8 (65001).
The following is a list of valid code page identifiers:
|UseInternalSecurityAPI: Tells the control whether or not to use the system security libraries or an internal implementation. By default the control will use the system security libraries to perform cryptographic functions. Setting this to True tells the control to use the internal implementation instead of using the system's security API.|