Worked on the openssl/openssl repository to enhance the security and reliability of cryptographic operations by addressing a critical bug in the EVP_EncryptUpdate and EVP_DecryptUpdate functions. Implemented early input validation to ensure negative input lengths are rejected, preventing unintended buffer allocations and reducing the risk of security vulnerabilities. The solution introduced a dedicated error path for invalid input lengths, signaling issues through EVP_R_INVALID_LENGTH. This update, developed in C with a focus on cryptography and security validation, was peer-reviewed and merged after addressing OpenSSL issue #30486. The work improved the robustness of the EVP update APIs without introducing new features.