openssl-dsa, dsa - DSA key processing
openssl dsa [-help] [-inform PEM|DER] [-outform
  PEM|DER] [-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] [-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
  - -help
- Print out a usage message.
- -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 accepted. 
- -outform DER|PEM
- This specifies the output format, the options have the same meaning and
      default as the -inform option.
- -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).
- -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 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.
- -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 file. With this option a
      public key is read instead.
- -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.
- -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:
 -----BEGIN DSA PRIVATE KEY-----
 -----END DSA PRIVATE KEY-----
The PEM public key format uses the header and footer lines:
 -----BEGIN PUBLIC KEY-----
 -----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
dsaparam(1), gendsa(1), rsa(1), genrsa(1)
Copyright 2000-2018 The OpenSSL Project Authors. All Rights Reserved.
Licensed under the OpenSSL license (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>.