Worked on the apache/impala repository to deliver OpenSSL 3.0 compatibility for MD5 and SHA1 digests within the squeasel crypto path, focusing on enabling FIPS-compliant operation. The approach involved refactoring the cryptographic code to use the EVP interface in C, while introducing backward-compatibility macros to support older OpenSSL versions. Comprehensive cross-version testing was performed, covering OpenSSL 1.0.2 through 3.0, with validation on RHEL 7 environments to ensure reliability. This work improved the maintainability and security of the codebase, addressing compatibility issues and reducing runtime risk in FIPS environments through careful software testing and cryptography expertise.