During December 2024, Brainpower expanded cryptographic test coverage for the GMP extension in the schneems/php-src repository. Focusing on PHP and leveraging expertise in cryptography and the GMP extension, Brainpower implemented comprehensive tests for gmp_pow with large, cryptographic-sized numbers. The work included demonstrations of finite field arithmetic and Diffie-Hellman key exchange, ensuring robust validation of numeric handling under cryptographic constraints. By enhancing the test suite, Brainpower enabled earlier detection of regressions and improved the reliability of cryptographic-number operations. The depth of the contribution is reflected in the targeted, well-documented commit, which strengthens the security posture of the codebase.