OSSL-GUIDE-LIBSSL-INTRODUCTION(7ssl) OpenSSL ossl-guide-libssl-introduction, ssl - OpenSSL: libssl OpenSSL "libssl" . SSL/TLS (SSLv3 TLSv1 TLSv1.1 TLSv1.2 TLSv1.3) DTLS (DTLSv1 DTLSv1.2) QUIC ( ). "libcrypto" ( ossl-guide-libcrypto-introduction(7)). (APIs) "libssl" . "libssl" SSL SSL_CTX. SSL . . DTLS " " (datagram) . SSL . TLS QUIC "" (stream) . . . SSL/TLS . SSL . ossl-guide-tls-introduction(7) . QUIC . SSL . SSL . ossl-guide-quic-introduction(7) . SSL_CTX SSL . SSL_CTX ( SSL ). API libssl : SSL_CTX SSL. SSL_CTX SSL . SSL SSL . SSL_CTX SSL . SSL_CTX SSL . . SSL_METHOD ( SSL) SSL/TLS DTLS QUIC. SSL_CTX. SSL_SESSION ( SSL) . SSL_SESSION. SSL_SESSION . SSL_CIPHER ( SSL) . . SSL_CIPHER. SSL_CTX SSL. ossl-guide-tls-introduction(7) SSL/TLS ossl-guide-quic-introduction(7) QUIC. ossl-guide-libcrypto-introduction(7) "libcrypto". ossl-guide-libcrypto-introduction(7), ossl-guide-tls-introduction(7), ossl-guide-quic-introduction(7) 2000-2025 OpenSSL. . Apache 2.0 ( ""). . LICENSE . 3 . . : . 3.6.2 7 2026 OSSL-GUIDE-LIBSSL-INTRODUCTION(7ssl)