OPENSSL-DSA(1SSL) OpenSSL OPENSSL-DSA(1SSL)
NAME
openssl-dsa - DSA key processing
SYNOPSIS
openssl dsa [-help] [-inform DER|PEM] [-outform DER|PEM] [-in filename]
[-passin arg] [-out filename] [-passout arg] [-aes128] [-aes192]
[-aes256] [-aria128] [-aria192] [-aria256] [-camellia128] [-camellia192]
[-camellia256] [-des] [-des3] [-idea] [-text] [-noout] [-modulus]
[-pubin] [-pubout] [-pvk-strong] [-pvk-weak] [-pvk-none] [-engine id]
[-provider name] [-provider-path path] [-provparam [name:]key=value]
[-propquery propq]
DESCRIPTION
This 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
OPTIONS
-help
Print out a usage message.
-inform DER|PEM
The key input format; unspecified by default. See
openssl-format-options(1) for details.
-outform DER|PEM
The key output format; the default is PEM. See
openssl-format-options(1) for details.
Private keys are a sequence of ASN.1 INTEGERS: the version (zero),
p, q, g, and the public and private key components. Public keys are
a SubjectPublicKeyInfo structure with the DSA type.
The PEM format also accepts PKCS#8 data.
-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.
-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.
-passin arg, -passout arg
The password source for the input and output file. For more
information about the format of arg see
openssl-passphrase-options(1).
-aes128, -aes192, -aes256, -aria128, -aria192, -aria256, -camellia128,
-camellia192, -camellia256, -des, -des3, -idea
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 this command can be used to remove the pass phrase from a
key by not giving any encryption option is given, or to add or
change the pass phrase by setting them. These options can only be
used with PEM format output files.
-text
Prints out the public, private key components and parameters.
-noout
This option prevents output of the encoded version of the key.
-modulus
This option prints out the value of the public key component of the
key.
-pubin
By default, a private key is read from the input. With this option
a public key is read instead. If the input contains no public key
but a private key, its public part is used.
-pubout
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.
-pvk-strong
Enable 'Strong' PVK encoding level (default).
-pvk-weak
Enable 'Weak' PVK encoding level.
-pvk-none
Don't enforce PVK encoding.
-engine id
See "Engine Options" in openssl(1). This option is deprecated.
-provider name
-provider-path path
-provparam [name:]key=value
-propquery propq
See "Provider Options" in openssl(1), provider(7), and property(7).
The openssl-pkey(1) command is capable of performing all the operations
this command can, as well as supporting other public key types.
EXAMPLES
The documentation for the openssl-pkey(1) command contains examples
equivalent to the ones listed here.
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
SEE ALSO
openssl(1), openssl-pkey(1), openssl-dsaparam(1), openssl-gendsa(1),
openssl-rsa(1), openssl-genrsa(1)
HISTORY
The -engine option was deprecated in OpenSSL 3.0.
COPYRIGHT
Copyright 2000-2023 The OpenSSL Project Authors. All Rights Reserved.
Licensed under the Apache License 2.0 (the "License"). You may not use
this file except in compliance with the License. You can obtain a copy
in the file LICENSE in the source distribution or at
<https://www.openssl.org/source/license.html>.
3.5.4 2025-09-30 OPENSSL-DSA(1SSL)
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