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openssl

NAME

openssl - OpenSSL command line tool

SYNOPSIS

opensslcommand [ 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 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.