openssl
OpenSSL is a robust, commercial-grade, full-featured Open Source Toolkit for the
Transport Layer Security (TLS) protocol formerly known as the Secure Sockets
Layer (SSL) protocol. The protocol implementation is based on a full-strength
general purpose cryptographic library, which can also be used stand-alone.
https://github.com/openssl/opensslopenssl command
$ echo | openssl s_client -connect redhat.com:443 -brief
CONNECTION ESTABLISHED
Protocol version: TLSv1.2
Ciphersuite: ECDHE-RSA-AES128-GCM-SHA256
Peer certificate: C = US, ST = North Carolina, L = Raleigh, O = "Red Hat, Inc.", OU = Information Technology, CN = *.redhat.com
Hash used: SHA256
Signature type: RSA
Verification: OK
Supported Elliptic Curve Point Formats: uncompressed
Server Temp Key: ECDH, P-256, 256 bits
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