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📛 NAME

asn1parse, ca, ciphers, cms, crl, crl2pkcs7, dgst, dhparam, dsa, dsaparam, ec, ecparam, enc, engine, errstr, gendsa, genpkey, genrsa, info, kdf, mac, nseq, ocsp, passwd, pkcs12, pkcs7, pkcs8, pkey, pkeyparam, pkeyutl, prime, rand, rehash, req, rsa, rsautl, s_client, s_server, s_time, sess_id, smime, speed, spkac, srp, storeutl, ts, verify, version, x509 — OpenSSL application commands

🚀 Quick Reference

Use Case	Command	Description
🔑 Generate RSA private key	openssl genrsa -out key.pem 2048	Create a 2048-bit RSA private key
📄 Generate Certificate Signing Request (CSR)	openssl req -new -key key.pem -out csr.pem	Create a CSR from an existing key
🔍 View certificate details	openssl x509 -in cert.pem -text -noout	Display human-readable certificate info
🔒 Encrypt a file with AES-256-CBC	openssl enc -aes-256-cbc -salt -in file -out file.enc	Symmetric encryption with password
🔐 Decrypt a file	openssl enc -d -aes-256-cbc -in file.enc -out file	Decrypt using the same password
🔗 Compute SHA-256 digest	openssl dgst -sha256 file	Generate a cryptographic hash
🌐 Test TLS connection	openssl s_client -connect host:port	Connect to a TLS server for debugging
📮 Check certificate chain	openssl verify -CAfile ca.pem cert.pem	Verify a certificate against a CA
⚡ Performance benchmark	openssl speed	Benchmark cipher and hash speeds
🗝️ Convert PKCS#12 to PEM	openssl pkcs12 -in keystore.p12 -out keys.pem -nodes	Extract private key and certificates

📋 SYNOPSIS

openssl cmd -help | [-option | -option arg] ... [arg] ...

📖 DESCRIPTION

Every cmd listed above is a (sub-)command of the openssl(1) application. It has its own detailed manual page at openssl-cmd(1). For example, to view the manual page for the openssl dgst command, type man openssl-dgst.

⚙️ OPTIONS

Among others, every subcommand has a help option.

• -help — 📖 Print out a usage message for the subcommand.

🔗 SEE ALSO

openssl(1), openssl-asn1parse(1), openssl-ca(1), openssl-ciphers(1), openssl-cms(1), openssl-crl(1), openssl-crl2pkcs7(1), openssl-dgst(1), openssl-dhparam(1), openssl-dsa(1), openssl-dsaparam(1), openssl-ec(1), openssl-ecparam(1), openssl-enc(1), openssl-engine(1), openssl-errstr(1), openssl-gendsa(1), openssl-genpkey(1), openssl-genrsa(1), openssl-info(1), openssl-kdf(1), openssl-mac(1), openssl-nseq(1), openssl-ocsp(1), openssl-passwd(1), openssl-pkcs12(1), openssl-pkcs7(1), openssl-pkcs8(1), openssl-pkey(1), openssl-pkeyparam(1), openssl-pkeyutl(1), openssl-prime(1), openssl-rand(1), openssl-rehash(1), openssl-req(1), openssl-rsa(1), openssl-rsautl(1), openssl-s_client(1), openssl-s_server(1), openssl-s_time(1), openssl-sess_id(1), openssl-smime(1), openssl-speed(1), openssl-spkac(1), openssl-srp(1), openssl-storeutl(1), openssl-ts(1), openssl-verify(1), openssl-version(1), openssl-x509(1)

📜 HISTORY

Initially, the manual page entry for the openssl cmd command used to be available at cmd(1). Later, the alias openssl-cmd(1) was introduced, which made it easier to group the openssl commands using the apropos(1) command or the shell's tab completion.

In order to reduce cluttering of the global manual page namespace, the manual page entries without the 'openssl-' prefix have been deprecated in OpenSSL 3.0 and will be removed in OpenSSL 4.0.

©️ COPYRIGHT

Copyright 2019–2020 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the Apache License 2.0 (the "License"). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at <https://www.openssl.org/source/license.html>.

3.0.2 2026-06-02 OPENSSL-CMDS(1SSL)

📛 NAME 🚀 Quick Reference 📋 SYNOPSIS 📖 DESCRIPTION ⚙️ OPTIONS 🔗 SEE ALSO 📜 HISTORY ©️ COPYRIGHT