Andrey Pshenkin developed a security-focused enhancement for the golang/go repository, implementing the EncryptOAEPWithOptions function in Go’s crypto/rsa package. This feature allows developers to specify separate hash functions for OAEP padding and MGF1 mask generation, addressing the need for greater cryptographic configurability in backend systems. Andrey’s approach preserved backward compatibility and adhered to Go’s cryptography best practices, ensuring minimal risk for downstream users. The work involved close coordination on design and review to maintain security correctness. Using Go and leveraging expertise in backend development and cryptography, Andrey delivered a targeted improvement that strengthens RSA encryption flexibility for modern applications.