NAME¶
openssl - OpenSSL command line tool
SYNOPSIS¶
openssl command [
command_opts ] [
command_args ]
openssl [
list-standard-commands |
list-message-digest-commands |
list-cipher-commands |
list-cipher-algorithms |
list-message-digest-algorithms |
list-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).
The pseudo-commands
list-standard-commands,
list-message-digest-commands, and
list-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 pseudo-commands
list-cipher-algorithms and
list-message-digest-algorithms list all cipher and message digest
names, one entry per line. Aliases are listed as:
from => to
The pseudo-command
list-public-key-algorithms lists all supported public
key algorithms.
The pseudo-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-...-commands,
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.
- dhparam
- Generation and Management of Diffie-Hellman Parameters. Superseded by
genpkey and pkeyparam
- dsa
- DSA Data Management.
- dsaparam
- DSA Parameter Generation and Management. Superseded by genpkey and
pkeyparam
- ec
- EC (Elliptic curve) key processing
- ecparam
- EC parameter manipulation and generation
- enc
- Encoding with Ciphers.
- engine
- Engine (loadble module) information and manipulation.
- errstr
- Error Number to Error String Conversion.
- gendh
- Generation of Diffie-Hellman Parameters. Obsoleted by dhparam.
- gendsa
- Generation of DSA Private Key from Parameters. Superseded by
genpkey and pkey
- genpkey
- Generation of Private Key or Parameters.
- genrsa
- Generation of RSA Private Key. Superceded by genpkey.
- 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.
- pkey
- Public and private key management.
- pkeyparam
- Public key algorithm parameter management.
- pkeyutl
- Public key algorithm cryptographic operation utility.
- rand
- Generate pseudo-random bytes.
- 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
- 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
- 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¶
- md2
- MD2 Digest
- md5
- MD5 Digest
- mdc2
- MDC2 Digest
- rmd160
- RMD-160 Digest
- sha
- SHA Digest
- sha1
- SHA-1 Digest
- sha224
- SHA-224 Digest
- sha256
- SHA-256 Digest
- sha384
- SHA-384 Digest
- sha512
- SHA-512 Digest
ENCODING AND CIPHER COMMANDS¶
- base64
- Base64 Encoding
- bf bf-cbc bf-cfb bf-ecb bf-ofb
- Blowfish Cipher
- cast cast-cbc
- CAST Cipher
- cast5-cbc cast5-cfb cast5-ecb cast5-ofb
- CAST5 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
PASS PHRASE ARGUMENTS¶
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.
- 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),
config(5),
crl(1),
crl2pkcs7(1),
dgst(1),
dhparam(1),
dsa(1),
dsaparam(1),
enc(1),
gendsa(1),
genpkey(1),
genrsa(1),
nseq(1),
openssl(1),
passwd(1),
pkcs12(1),
pkcs7(1),
pkcs8(1),
rand(1),
req(1),
rsa(1),
rsautl(1),
s_client(1),
s_server(1),
s_time(1),
smime(1),
spkac(1),
verify(1),
version(1),
x509(1),
crypto(3),
ssl(3),
x509v3_config(5)
HISTORY¶
The
openssl(1) document appeared in OpenSSL 0.9.2. The
list-XXX -commands pseudo-commands were added in OpenSSL
0.9.3; The
list-XXX-algorithms pseudo-commands were added
in OpenSSL 1.0.0; the
no-XXX pseudo-commands were added in
OpenSSL 0.9.5a. For notes on the availability of other commands, see their
individual manual pages.