Rijndael Component

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The Rijndael component can be used to encrypt and decrypt data through the Rijndael symmetric algorithm.

Syntax

TipcRijndael

Remarks

The Rijndael component can be used to encrypt and decrypt data through the Rijndael symmetric algorithm. Includes support for key sizes of 128, 192, and 256 bits, as well as block sizes of 128, 192, and 256 bits.

To begin simply specify the data you wish to encrypt or decrypt.

Input and Output Properties

The component will determine the source and destination of the input and output based on which properties are set.

The order in which the input properties are checked is as follows:

• SetInputStream
• InputFile
• InputMessage

When a valid source is found the search stops. The order in which the output properties are checked is as follows:

• SetOutputStream
• OutputFile
• OutputMessage: The output data is written to this property if no other destination is specified.

When using streams you may need to additionally set CloseInputStreamAfterProcessing or CloseOutputStreamAfterProcessing.

Before encrypting you must have a valid Key and IV. There are a few options available to you in regards to key management. The easiest option is to simply set KeyPassword. When KeyPassword is set the component will automatically create a Key and IV using the PKCS5 password digest algorithm. This means there is only one value you need to keep track of.

If you wish to have more control over the Key and IV values you may specify the properties yourself. If IV is left empty, one will be created for you when you call Encrypt or Decrypt.

A simple example:

Component.InputFile = "C:\MyFile.txt";
Component.OutputFile = "C:\Encrypted.txt";
Component.KeyPassword = "password";
Component.Encrypt();

Note that by default the component uses a key size of 256 bits and a block size of 128 bits. You may specify the key size by setting KeySize and the block size by setting BlockSize.