=pod

=head1 NAME

openssl - OpenSSL command line tool

=head1 SYNOPSIS

B<openssl>
I<command>
[ I<command_opts> ]
[ I<command_args> ]

=head1 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 B<openssl> program is a command line tool for using the various
cryptography functions of OpenSSL's B<crypto> library from the shell. 
It can be used for 

 o  Creation of RSA, DH and DSA key parameters
 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

=head1 COMMAND SUMMARY

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

=head2 STANDARD COMMANDS

=over 10

=item B<asn1parse> 

Parse an ASN.1 sequence.

=item B<ca>

Certificate Authority (CA) Management.  

=item B<ciphers>

Cipher Suite Description Determination.

=item B<crl>

Certificate Revocation List (CRL) Management.

=item B<crl2pkcs7>      

CRL2 to PKCS#7 Conversion.

=item B<dgst>

Message Digest Calculation.

=item B<dh>

Diffie-Hellman Data Management.

=item B<dsa>

DSA Data Management.

=item B<dsaparam>

DSA Parameter Generation.

=item B<enc>            

Encoding with Ciphers.

=item B<errstr>

Error Number to Error String Conversion.

=item B<gendh>

Generation of Diffie-Hellman Parameters.

=item B<gendsa>

Generation of DSA Parameters.

=item B<genrsa>

Generation of RSA Parameters.

=item B<pkcs7>

PKCS#7 Data Management.

=item B<req>

X.509 Certificate Signing Request (CSR) Management.

=item B<rsa>

RSA Data Management.

=item B<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 B<ssl> library.

=item B<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 B<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.

=item B<s_time>        

SSL Connection Timer.

=item B<sess_id>

SSL Session Data Management.

=item B<speed>

Algorithm Speed Measurement.

=item B<verify>

X.509 Certificate Verification.

=item B<version>

OpenSSL Version Information.

=item B<x509>           

X.509 Certificate Data Management.

=back

=head2 MESSAGE DIGEST COMMANDS

=over 10

=item B<md2>

MD2 Digest

=item B<md5>

MD5 Digest

=item B<mdc2>

MDC2 Digest

=item B<rmd160>

RMD-160 Digest

=item B<sha>            

SHA Digest

=item B<sha1>           

SHA-1 Digest

=back

=head2 ENCODING AND CIPHER COMMANDS

=over 10

=item B<base64>

Base64 Encoding

=item B<bf bf-cbc bf-cfb bf-ecb bf-ofb>

Blowfish Cipher

=item B<cast cast-cbc>

CAST Cipher

=item B<cast5-cbc cast5-cfb cast5-ecb cast5-ofb>

CAST5 Cipher

=item B<des des-cbc des-cfb des-ecb des-ede des-ede-cbc des-ede-cfb des-ede-ofb des-ofb>

DES Cipher

=item B<des3 desx des-ede3 des-ede3-cbc des-ede3-cfb des-ede3-ofb>

Triple-DES Cipher

=item B<idea idea-cbc idea-cfb idea-ecb idea-ofb>

IDEA Cipher

=item B<rc2 rc2-cbc rc2-cfb rc2-ecb rc2-ofb>

RC2 Cipher

=item B<rc4>

RC4 Cipher

=item B<rc5 rc5-cbc rc5-cfb rc5-ecb rc5-ofb>

RC5 Cipher

=back

=head1 DETAILED COMMAND DESCRIPTION

The following is a detailed description of every B<openssl> I<command>.

=over 4

=item B<openssl> B<s_client>
[B<-connect> I<host>B<:>I<port>]
[B<-verify> I<arg>]
[B<-cert> I<arg>]
[B<-key> I<arg>]
[B<-CApath> I<arg>]
[B<-CAfile> I<arg>]
[B<-reconnect>]
[B<-pause>]
[B<-debug>]
[B<-nbio_test>]
[B<-state>]
[B<-nbio>]
[B<-quiet>]
[B<-ssl2>]
[B<-ssl3>]
[B<-tls1>]
[B<-no_ssl2>]
[B<-no_ssl3>]
[B<-no_tls1>]
[B<-bugs>]
[B<-cipher>]

The B<s_client> command implements a generic SSL/TLS client which can
establish a transparent connection to a remote I<host> and I<port> speaking
SSL/TLS. 

=item B<openssl> B<s_server>
[B<-accept> I<port>]
[B<-verify> I<arg>]
[B<-Verify> I<arg>]
[B<-cert> I<arg>]
[B<-key> I<arg>]
[B<-dcert> I<arg>]
[B<-dkey> I<arg>]
[B<-nbio>]
[B<-nbio_test>]
[B<-debug>]
[B<-state>]
[B<-CApath> I<arg>]
[B<-CAfile> I<arg>]
[B<-nocert>]
[B<-cipher> I<arg>]
[B<-quiet>]
[B<-no_tmp_rsa>]
[B<-ssl2>]
[B<-ssl3>]
[B<-tls1>]
[B<-no_ssl2>]
[B<-no_ssl3>]
[B<-no_tls1>]
[B<-bugs>]
[B<-www>]
[B<-WWW>]

The B<s_server> command implements a generic SSL/TLS server which accepts
connections from remote clients on I<port> speaking SSL/TLS.

=back

...

=head1 SEE ALSO

crypto(3), ssl(3)

=head1 HISTORY

The openssl(3) document appeared in OpenSSL 0.9.2

=cut