OpenSSL guide (opens in a new tab)
A structured introduction to the toolkit, its libraries, providers, and application development.
OpenSSL Project · docs.openssl.org
OpenSSL 3.5
Foundations
TLS, certificates & cryptography
OpenSSL
Understand TLS, inspect certificates, and diagnose trust chains.
5References
3Subtopics
TLS concepts and protocol versions (opens in a new tab)
Understand encryption, peer authentication, and protocol negotiation before debugging a TLS connection.
OpenSSL Project · docs.openssl.org
OpenSSL 3.5
Foundations
s_client: diagnose TLS connections (opens in a new tab)
Inspect handshakes, SNI, certificate chains, and hostname verification using the command-line client.
OpenSSL Project · docs.openssl.org
OpenSSL 3.5
Diagnostics
x509: inspect and process certificates (opens in a new tab)
Look up certificate fields, expiry dates, extensions, fingerprints, and encoding conversions.
OpenSSL Project · docs.openssl.org
OpenSSL 3.5
Certificates
verify: certificate chain validation (opens in a new tab)
Understand trust stores, chain building, verification purposes, and certificate validation failures.
OpenSSL Project · docs.openssl.org
OpenSSL 3.5
Certificates