Developed and delivered BLAKE3 hashing support for the gchq/CyberChef project, enabling users to compute hashes with an optional 32-byte key and hexadecimal output. The implementation included comprehensive unit tests to ensure reliability and correctness. Alongside the new cryptographic feature, the work involved targeted code formatting improvements and the addition of Categories and an index, enhancing code maintainability and user discoverability. Leveraging JavaScript and WebAssembly, the developer focused on both cryptography and usability, broadening CyberChef’s secure data processing capabilities while reducing reliance on external tools. The changes reflected a thorough, end-to-end approach to feature delivery and code quality.