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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 a self-signed certificate	openssl req -x509 -newkey rsa:4096 -keyout key.pem -out cert.pem -days 365	Create a self-signed X.509 certificate and RSA key
🔏 Generate a certificate signing request (CSR)	openssl req -new -key key.pem -out csr.pem	Create a CSR for submission to a CA
🔒 Encrypt a file	openssl enc -aes-256-cbc -salt -in plain.txt -out encrypted.enc	Symmetric encryption of a file
🔓 Decrypt a file	openssl enc -d -aes-256-cbc -in encrypted.enc -out plain.txt	Symmetric decryption of a file
🔑 Generate an RSA private key	openssl genrsa -out key.pem 2048	Generate a new RSA private key
🔑 Generate an EC private key	openssl ecparam -genkey -name prime256v1 -out key.pem	Generate an Elliptic Curve private key
🔍 Verify a certificate signature	openssl verify -CAfile ca.pem cert.pem	Verify a certificate against a CA trust store
🔗 Compute a message digest	openssl dgst -sha256 -out digest.txt file.txt	Compute SHA-256 hash of a file
🌐 Test TLS connection	openssl s_client -connect example.com:443	Connect to a TLS server for debugging
📄 View certificate details	openssl x509 -in cert.pem -text -noout	Display the contents of a certificate in human-readable form

🔧 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>.

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