
=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
 o  Handling of S/MIME signed or encrypted mail

=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>      

CRL 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<smime>

S/MIME mail processing.

=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 SEE ALSO

L<asn1parse(1)|asn1parse(1)>, L<ca(1)|ca(1)>, L<config(5)|config(5)>,
L<crl(1)|crl(1)>, L<crl2pkcs7(1)|crl2pkcs7(1)>, L<dgst(1)|dgst(1)>,
L<dhparam(1)|dhparam(1)>, L<dsa(1)|dsa(1)>, L<dsaparam(1)|dsaparam(1)>,
L<enc(1)|enc(1)>, L<gendsa(1)|gendsa(1)>,
L<genrsa(1)|genrsa(1)>, L<nseq(1)|nseq(1)>, L<openssl(1)|openssl(1)>,
L<pkcs12(1)|pkcs12(1)>, L<pkcs7(1)|pkcs7(1)>, L<pkcs8(1)|pkcs8(1)>,
L<req(1)|req(1)>, L<rsa(1)|rsa(1)>, L<s_client(1)|s_client(1)>,
L<s_server(1)|s_server(1)>, L<smime(1)|smime(1)>, L<spkac(1)|spkac(1)>,
L<verify(1)|verify(1)>, L<version(1)|version(1)>, L<x509(1)|x509(1)>,
L<crypto(3)|crypto(3)>, L<ssl(3)|ssl(3)> 

=head1 HISTORY

The openssl(1) document appeared in OpenSSL 0.9.2

=cut