DigiNews

Summary

OpenSSL 4.0.0 is a feature release that introduces major new capabilities alongside numerous breaking changes and deprecations. It adds Encrypted Client Hello (ECH), SM2/SM3 and other cryptographic enhancements, while removing legacy features like SSLv2/SSLv3 and engine support. The release also refactors internals (opaque ASN1_STRING, const qualifiers) and expands FIPS handling, with several API and workflow implications for developers and operators upgrading OpenSSL in production.