NAME 

openssl - OpenSSL command line tool

SYNOPSIS 

openssl command [ command_opts ] [ command_args ]

openssl [ list-standard-commands | list-message-digest-commands | list-cipher-commands ]

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 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