Trfcrypt

trfcrypt is a software add-on that extends the functionality of the tcl-extension trf. Its main feature is encryption, which was intentionally omitted from the base package to comply with US export control laws on cryptography. With the trfcrypt package, users can access a C API that seamlessly integrates with the existing trf C API to manage, implement, and use blockciphers and stream.

While it is technically possible to implement ciphers using only the trf C API, trfcrypt's codebase streamlines the process considerably. The package includes several helpful tools for handling blockcipher modes and other essential operations, which eliminates the need to repeatedly reimplement such functionality. To add a new cipher to the system, users need to provide some essential information, such as key sizes, and functions that generate the internal keyschedule from the specified key, encrypt/decrypt a character or a block of data.

In summary, trfcrypt is an outstanding software package that significantly eases the implementation and management of encryption protocols. Its C API integration and proprietary tools make it an essential add-on for developers who require a fast, streamlined, and secure approach to encryption.