- NAME
- SYNOPSIS
- DESCRIPTION
- COMMAND SUMMARY
  - Standard Commands
  - Message Digest Commands
  - Encoding and Cipher Commands
- OPTIONS
  - Common Options
  - Pass Phrase Options
- SEE ALSO
- HISTORY
- COPYRIGHT

# NAME

openssl - OpenSSL command line tool

# SYNOPSIS

openssl command [ command_opts ] [ command_args ]

openssl list [ standard-commands | digest-commands | cipher-commands | cipher-algorithms | digest-algorithms | public-key-algorithms]

openssl no-XXX [ arbitrary options ]

# DESCRIPTION

OpenSSL is a cryptography toolkit implementing the Secure Sockets Layer (SSL v2/v3) and Transport Layer Security (TLS v1) network protocols and related cryptography standards required by them.

The openssl program is a command line tool for using the various cryptography functions of OpenSSL's crypto library from the shell. It can be used for

     o  Creation and management of private keys, public keys and parameters
     o  Public key cryptographic operations
     o  Creation of X.509 certificates, CSRs and CRLs
     o  Calculation of Message Digests
     o  Encryption and Decryption with Ciphers
     o  SSL/TLS Client and Server Tests
     o  Handling of S/MIME signed or encrypted mail
     o  Time Stamp requests, generation and verification

# COMMAND SUMMARY

The openssl program provides a rich variety of commands (command in the SYNOPSIS above), each of which often has a wealth of options and arguments (command_opts and command_args in the SYNOPSIS).

Detailed documentation and use cases for most standard subcommands are available (e.g., x509(1) or openssl-x509(1)).

Many commands use an external configuration file for some or all of their arguments and have a -config option to specify that file. The environment variable OPENSSL_CONF can be used to specify the location of the file. If the environment variable is not specified, then the file is named openssl.cnf in the default certificate storage area, whose value depends on the configuration flags specified when the OpenSSL was built.

The list parameters standard-commands, digest-commands, and cipher-commands output a list (one entry per line) of the names of all standard commands, message digest commands, or cipher commands, respectively, that are available in the present openssl utility.

The list parameters cipher-algorithms and digest-algorithms list all cipher and message digest names, one entry per line. Aliases are listed as:

     from => to

The list parameter public-key-algorithms lists all supported public key algorithms.

The command no-XXX tests whether a command of the specified name is available. If no command named XXX exists, it returns 0 (success) and prints no-XXX; otherwise it returns 1 and prints XXX. In both cases, the output goes to stdout and nothing is printed to stderr. Additional command line arguments are always ignored. Since for each cipher there is a command of the same name, this provides an easy way for shell scripts to test for the availability of ciphers in the openssl program. (no-XXX is not able to detect pseudo-commands such as quit, list, or no-XXX itself.)

## Standard Commands

asn1parse

  Parse an ASN.1 sequence.

ca

  Certificate Authority (CA) Management.

ciphers

  Cipher Suite Description Determination.

cms

  CMS (Cryptographic Message Syntax) utility.

crl

  Certificate Revocation List (CRL) Management.

crl2pkcs7

  CRL to PKCS#7 Conversion.

dgst

  Message Digest Calculation.

dh

  Diffie-Hellman Parameter Management. Obsoleted by dhparam(1).

dhparam

  Generation and Management of Diffie-Hellman Parameters. Superseded by genpkey(1) and pkeyparam(1).

dsa

  DSA Data Management.

dsaparam

  DSA Parameter Generation and Management. Superseded by genpkey(1) and pkeyparam(1).

ec

  EC (Elliptic curve) key processing.

ecparam

  EC parameter manipulation and generation.

enc

  Encoding with Ciphers.

engine

  Engine (loadable module) information and manipulation.

errstr

  Error Number to Error String Conversion.

gendh

  Generation of Diffie-Hellman Parameters. Obsoleted by dhparam(1).

gendsa

  Generation of DSA Private Key from Parameters. Superseded by genpkey(1) and pkey(1).

genpkey

  Generation of Private Key or Parameters.

genrsa

  Generation of RSA Private Key. Superseded by genpkey(1).

nseq

  Create or examine a Netscape certificate sequence.

ocsp

  Online Certificate Status Protocol utility.

passwd

  Generation of hashed passwords.

pkcs12

  PKCS#12 Data Management.

pkcs7

  PKCS#7 Data Management.

pkcs8

  PKCS#8 format private key conversion tool.

pkey

  Public and private key management.

pkeyparam

  Public key algorithm parameter management.

pkeyutl

  Public key algorithm cryptographic operation utility.

prime

  Compute prime numbers.

rand

  Generate pseudo-random bytes.

rehash

  Create symbolic links to certificate and CRL files named by the hash values.

req

  PKCS#10 X.509 Certificate Signing Request (CSR) Management.

rsa

  RSA key management.

rsautl

  RSA utility for signing, verification, encryption, and decryption. Superseded by pkeyutl(1).

s_client

  This implements a generic SSL/TLS client which can establish a transparent connection to a remote server speaking SSL/TLS. It's intended for testing purposes only and provides only rudimentary interface functionality but internally uses mostly all functionality of the OpenSSL ssl library.

s_server

  This implements a generic SSL/TLS server which accepts connections from remote clients speaking SSL/TLS. It's intended for testing purposes only and provides only rudimentary interface functionality but internally uses mostly all functionality of the OpenSSL ssl library. It provides both an own command line oriented protocol for testing SSL functions and a simple HTTP response facility to emulate an SSL/TLS-aware webserver.

s_time

  SSL Connection Timer.

sess_id

  SSL Session Data Management.

smime

  S/MIME mail processing.

speed

  Algorithm Speed Measurement.

spkac

  SPKAC printing and generating utility.

srp

  Maintain SRP password file.

storeutl

  Utility to list and display certificates, keys, CRLs, etc.

ts

  Time Stamping Authority tool (client/server).

verify

  X.509 Certificate Verification.

version

  OpenSSL Version Information.

x509

  X.509 Certificate Data Management.

## Message Digest Commands

blake2b512

  BLAKE2b-512 Digest

blake2s256

  BLAKE2s-256 Digest

md2

  MD2 Digest

md4

  MD4 Digest

md5

  MD5 Digest

mdc2

  MDC2 Digest

rmd160

  RMD-160 Digest

sha1

  SHA-1 Digest

sha224

  SHA-2 224 Digest

sha256

  SHA-2 256 Digest

sha384

  SHA-2 384 Digest

sha512

  SHA-2 512 Digest

sha3-224

  SHA-3 224 Digest

sha3-256

  SHA-3 256 Digest

sha3-384

  SHA-3 384 Digest

sha3-512

  SHA-3 512 Digest

shake128

  SHA-3 SHAKE128 Digest

shake256

  SHA-3 SHAKE256 Digest

sm3

  SM3 Digest

## Encoding and Cipher Commands

The following aliases provide convenient access to the most used encodings and ciphers.

Depending on how OpenSSL was configured and built, not all ciphers listed here may be present. See enc(1) for more information and command usage.

aes128, aes-128-cbc, aes-128-cfb, aes-128-ctr, aes-128-ecb, aes-128-ofb

  AES-128 Cipher

aes192, aes-192-cbc, aes-192-cfb, aes-192-ctr, aes-192-ecb, aes-192-ofb

  AES-192 Cipher

aes256, aes-256-cbc, aes-256-cfb, aes-256-ctr, aes-256-ecb, aes-256-ofb

  AES-256 Cipher

aria128, aria-128-cbc, aria-128-cfb, aria-128-ctr, aria-128-ecb, aria-128-ofb

  Aria-128 Cipher

aria192, aria-192-cbc, aria-192-cfb, aria-192-ctr, aria-192-ecb, aria-192-ofb

  Aria-192 Cipher

aria256, aria-256-cbc, aria-256-cfb, aria-256-ctr, aria-256-ecb, aria-256-ofb

  Aria-256 Cipher

base64

  Base64 Encoding

bf, bf-cbc, bf-cfb, bf-ecb, bf-ofb

  Blowfish Cipher

camellia128, camellia-128-cbc, camellia-128-cfb, camellia-128-ctr, camellia-128-ecb, camellia-128-ofb

  Camellia-128 Cipher

camellia192, camellia-192-cbc, camellia-192-cfb, camellia-192-ctr, camellia-192-ecb, camellia-192-ofb

  Camellia-192 Cipher

camellia256, camellia-256-cbc, camellia-256-cfb, camellia-256-ctr, camellia-256-ecb, camellia-256-ofb

  Camellia-256 Cipher

cast, cast-cbc

  CAST Cipher

cast5-cbc, cast5-cfb, cast5-ecb, cast5-ofb

  CAST5 Cipher

chacha20

  Chacha20 Cipher

des, des-cbc, des-cfb, des-ecb, des-ede, des-ede-cbc, des-ede-cfb, des-ede-ofb, des-ofb

  DES Cipher

des3, desx, des-ede3, des-ede3-cbc, des-ede3-cfb, des-ede3-ofb

  Triple-DES Cipher

idea, idea-cbc, idea-cfb, idea-ecb, idea-ofb

  IDEA Cipher

rc2, rc2-cbc, rc2-cfb, rc2-ecb, rc2-ofb

  RC2 Cipher

rc4

  RC4 Cipher

rc5, rc5-cbc, rc5-cfb, rc5-ecb, rc5-ofb

  RC5 Cipher

seed, seed-cbc, seed-cfb, seed-ecb, seed-ofb

  SEED Cipher

sm4, sm4-cbc, sm4-cfb, sm4-ctr, sm4-ecb, sm4-ofb

  SM4 Cipher

# OPTIONS

Details of which options are available depend on the specific command. This section describes some common options with common behavior.

## Common Options

-help

  Provides a terse summary of all options.

## Pass Phrase Options

Several commands accept password arguments, typically using -passin and -passout for input and output passwords respectively. These allow the password to be obtained from a variety of sources. Both of these options take a single argument whose format is described below. If no password argument is given and a password is required then the user is prompted to enter one: this will typically be read from the current terminal with echoing turned off.

Note that character encoding may be relevant, please see passphrase-encoding(7).

pass:password

  The actual password is password. Since the password is visible to utilities (like 'ps' under Unix) this form should only be used where security is not important.

env:var

  Obtain the password from the environment variable var. Since the environment of other processes is visible on certain platforms (e.g. ps under certain Unix OSes) this option should be used with caution.

file:pathname

  The first line of pathname is the password. If the same pathname argument is supplied to -passin and -passout arguments then the first line will be used for the input password and the next line for the output password. pathname need not refer to a regular file: it could for example refer to a device or named pipe.

fd:number

  Read the password from the file descriptor number. This can be used to send the data via a pipe for example.

stdin

  Read the password from standard input.

# SEE ALSO

asn1parse(1), ca(1), ciphers(1), cms(1), config(5), crl(1), crl2pkcs7(1), dgst(1), dhparam(1), dsa(1), dsaparam(1), ec(1), ecparam(1), enc(1), engine(1), errstr(1), gendsa(1), genpkey(1), genrsa(1), nseq(1), ocsp(1), passwd(1), pkcs12(1), pkcs7(1), pkcs8(1), pkey(1), pkeyparam(1), pkeyutl(1), prime(1), rand(1), rehash(1), req(1), rsa(1), rsautl(1), s_client(1), s_server(1), s_time(1), sess_id(1), smime(1), speed(1), spkac(1), srp(1), storeutl(1), ts(1), verify(1), version(1), x509(1), crypto(7), ssl(7), x509v3_config(5)

# HISTORY

The list-XXX-algorithms pseudo-commands were added in OpenSSL 1.0.0; For notes on the availability of other commands, see their individual manual pages.

# COPYRIGHT

Copyright 2000-2018 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the OpenSSL license (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.