Ryan Alcorn developed secure key derivation enhancements for the aws/rolesanywhere-credential-helper repository, focusing on cryptographic compatibility and code quality. He implemented HMAC-SHA1 PRF support in PBKDF2 key derivation, enabling seamless integration with ACM-exported keys and aligning with RFC 8018 standards. Using Go, he expanded PBKDF2 parameter handling and introduced new constants to support SHA-1, while also creating comprehensive test fixtures for encrypted private keys. To maintain static code analysis integrity, Ryan excluded sensitive test keys from Semgrep scans, reducing false positives. His work emphasized robust testing and maintainability, laying groundwork for future cryptographic improvements without introducing production risk.