OnWorks favicon

dsassl - Online in the Cloud

Run dsassl in OnWorks free hosting provider over Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator

This is the command dsassl that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator



dsa - DSA key processing


openssl dsa [-inform PEM|DER] [-outform PEM|DER] [-in filename] [-passin arg] [-out
filename] [-passout arg] [-aes128] [-aes192] [-aes256] [-camellia128] [-camellia192]
[-camellia256] [-des] [-des3] [-idea] [-text] [-noout] [-modulus] [-pubin] [-pubout]
[-engine id]


The dsa command processes DSA keys. They can be converted between various forms and their
components printed out. Note This command uses the traditional SSLeay compatible format
for private key encryption: newer applications should use the more secure PKCS#8 format
using the pkcs8


-inform DER|PEM
This specifies the input format. The DER option with a private key uses an ASN1 DER
encoded form of an ASN.1 SEQUENCE consisting of the values of version (currently
zero), p, q, g, the public and private key components respectively as ASN.1 INTEGERs.
When used with a public key it uses a SubjectPublicKeyInfo structure: it is an error
if the key is not DSA.

The PEM form is the default format: it consists of the DER format base64 encoded with
additional header and footer lines. In the case of a private key PKCS#8 format is also

-outform DER|PEM
This specifies the output format, the options have the same meaning as the -inform

-in filename
This specifies the input filename to read a key from or standard input if this option
is not specified. If the key is encrypted a pass phrase will be prompted for.

-passin arg
the input file password source. For more information about the format of arg see the
PASS PHRASE ARGUMENTS section in openssl(1).

-out filename
This specifies the output filename to write a key to or standard output by is not
specified. If any encryption options are set then a pass phrase will be prompted for.
The output filename should not be the same as the input filename.

-passout arg
the output file password source. For more information about the format of arg see the
PASS PHRASE ARGUMENTS section in openssl(1).

These options encrypt the private key with the specified cipher before outputting it.
A pass phrase is prompted for. If none of these options is specified the key is
written in plain text. This means that using the dsa utility to read in an encrypted
key with no encryption option can be used to remove the pass phrase from a key, or by
setting the encryption options it can be use to add or change the pass phrase. These
options can only be used with PEM format output files.

prints out the public, private key components and parameters.

this option prevents output of the encoded version of the key.

this option prints out the value of the public key component of the key.

by default a private key is read from the input file: with this option a public key is
read instead.

by default a private key is output. With this option a public key will be output
instead. This option is automatically set if the input is a public key.

-engine id
specifying an engine (by its unique id string) will cause dsa to attempt to obtain a
functional reference to the specified engine, thus initialising it if needed. The
engine will then be set as the default for all available algorithms.


The PEM private key format uses the header and footer lines:


The PEM public key format uses the header and footer lines:


-----END PUBLIC KEY-----


To remove the pass phrase on a DSA private key:

openssl dsa -in key.pem -out keyout.pem

To encrypt a private key using triple DES:

openssl dsa -in key.pem -des3 -out keyout.pem

To convert a private key from PEM to DER format:

openssl dsa -in key.pem -outform DER -out keyout.der

To print out the components of a private key to standard output:

openssl dsa -in key.pem -text -noout

To just output the public part of a private key:

openssl dsa -in key.pem -pubout -out pubkey.pem

Use dsassl online using onworks.net services

Free Servers & Workstations

Download Windows & Linux apps

  • 1
    Alt-F provides a free and open source
    alternative firmware for the DLINK
    DNS-320/320L/321/323/325/327L and
    DNR-322L. Alt-F has Samba and NFS;
    supports ext2/3/4...
    Download Alt-F
  • 2
    Usm is a unified slackware package
    manager that handles automatic
    dependency resolution. It unifies
    various package repositories including
    slackware, slacky, p...
    Download usm
  • 3
    Chart.js is a Javascript library that
    allows designers and developers to draw
    all kinds of charts using the HTML5
    canvas element. Chart js offers a great
    array ...
    Download Chart.js
  • 4
    iReport-Designer for JasperReports
    iReport-Designer for JasperReports
    NOTE: iReport/Jaspersoft Studio Support
    Announcement: As of version 5.5.0,
    Jaspersoft Studio will be the official
    design client for JasperReports. iReport
    Download iReport-Designer for JasperReports
  • 5
    PostInstallerF will install all the
    software that Fedora Linux and others
    doesn't include by default, after
    running Fedora for the first time. Its
    easy for...
    Download PostInstallerF
  • 6
    The strace project has been moved to
    https://strace.io. strace is a
    diagnostic, debugging and instructional
    userspace tracer for Linux. It is used
    to monitor a...
    Download strace
  • More »

Linux commands