openssl(1ssl)openssl(1ssl)NAMEopenssl - OpenSSL command line tool
SYNOPSISopenssl command [command_opts] [command_args]      
openssl [list-standard-commands | list-message-digest-commands| list-
openssl no-XXX [arbitrary options]
The openssl program provides a rich variety of commands, each of which
often has a wealth of options and arguments.
The pseudo-commands list-standard-commands, list-message-digest-com‐
mands, 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 util‐
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. (The no-XXX command is not able to detect pseudo-com‐
mands such as quit, list- ...-commands, or no-XXX itself.)
Parse an ASN.1 sequence. Certificate Authority (CA) Management.
Cipher Suite Description Determination. Certificate Revocation List
(CRL) Management. CRL to PKCS#7 Conversion. Message Digest Calcula‐
tion. Diffie-Hellman Parameter Management. Obsoleted by dhparam. DSA
Data Management. DSA Parameter Generation. Encoding with Ciphers.
Error Number to Error String Conversion. Generation and Management of
Diffie-Hellman Parameters. Generation of Diffie-Hellman Parameters.
Obsoleted by dhparam. Generation of DSA Parameters. Generation of RSA
Parameters. Generation of hashed passwords. PKCS#12 Data Management.
PKCS#7 Data Management. Generate pseudo-random bytes. X.509 Certifi‐
cate Signing Request (CSR) Management. RSA Data Management. RSA util‐
ity for signing, verification, encryption, and decryption. Implements
a generic SSL/TLS client which can establish a transparent connection
to a remote server speaking SSL/TLS. It is intended for testing pur‐
poses only and provides only rudimentary interface functionality but
internally uses mostly all functionality of the OpenSSL ssl library.
This implements a generic SSL/TLS server which accepts connections from
remote clients speaking SSL/TLS. It is intended for testing purposes
only and provides only rudimentary interface functionality but inter‐
nally 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. SSL Connection Timer. SSL Session Data Management.
S/MIME mail processing. Algorithm Speed Measurement. X.509 Certifi‐
cate Verification. OpenSSL Version Information. X.509 Certificate
MESSAGE DIGEST COMMANDS
MD2 Digest MD5 Digest MDC2 Digest RMD-160 Digest SHA Digest SHA-1
ENCODING AND CIPHER COMMANDS
Base64 Encoding Blowfish Cipher CAST Cipher CAST5 Cipher DES Cipher
Triple-DES Cipher IDEA Cipher RC2 Cipher RC4 Cipher RC5 Cipher
PASSWORD PHRASE ARGUMENTS
Several commands accept password arguments, typically using the -passin
and the -passout options 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. The actual password is pass‐
word. Since the password is visible to utilities (such as ps under
UNIX), this form should only be used where security is not important.
Obtains the password from the environment variable var. Since the envi‐
ronment of other processes is visible on certain platforms (e.g. ps
under certain UNIX operating systems), this option should be used with
caution. The first line of pathname is the password. If the same path‐
name 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. The pathname need not refer to a regular file. It
could, for example, refer to a device or named pipe. Reads the pass‐
word from the file descriptor number. This can be used, for example, to
send the data via a pipe. Reads the password from standard input.
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 cryp‐
tography functions of OpenSSL's crypto library from the shell. It can
be used for the following: Creation of RSA, DH and DSA key parameters
Creation of X.509 certificates, CSRs and CRLs Calculation of Message
Digests Encryption and Decryption with Ciphers SSL/TLS Client and
Server Tests Handling of S/MIME signed or encrypted mail
The openssl(1ssl) document appeared in OpenSSL 0.9.2. The list-XXX-com‐
mands pseudo-commands were added in OpenSSL 0.9.3. 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.
Commands: asn1parse(1ssl), ca(1ssl), crl(1ssl), crl2pkcs7(1ssl),
dgst(1ssl), dhparam(1ssl), dsa(1ssl), dsaparam(1ssl), enc(1sl),
gendsa(1ssl), genrsa(1ssl), nseq(1ssl), openssl(1ssl), passwd(1ssl),
pkcs12(1ssl), pkcs7(1ssl), pkcs8(1ssl), rand(1ssl), req(1ssl),
rsa(1ssl), rsautl(1ssl), s_client(1ssl), s_server(1ssl), smime(1ssl),
spkac(1ssl), verify(1ssl), version(1ssl), x509(1ssl)
Functions: crypto(3), ssl(3)