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NAME

     dsaparam - DSA parameter manipulation and generation



SYNOPSIS
     openssl dsaparam [-inform DER|PEM] [-outform DER|PEM] [-in
     filename] [-out filename] [-noout] [-text] [-C] [-rand
     file(s)] [-genkey] [numbits]



DESCRIPTION
     This command is used to manipulate or generate DSA parameter
     files.



OPTIONS
     -inform DER|PEM
         This specifies the input format. The DER option uses an
         ASN1 DER encoded form compatible with RFC2459 (PKIX)
         DSS-Parms that is a SEQUENCE consisting of p, q and g
         respectively. The PEM form is the default format: it
         consists of the DER format base64 encoded with
         additional header and footer lines.

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

     -in filename
         This specifies the input filename to read parameters
         from or standard input if this option is not specified.
         If the numbits parameter is included then this option
         will be ignored.

     -out filename
         This specifies the output filename parameters to.
         Standard output is used if this option is not present.
         The output filename should not be the same as the input
         filename.

     -noout
         this option inhibits the output of the encoded version
         of the parameters.

     -text
         this option prints out the DSA parameters in human
         readable form.

     -C  this option converts the parameters into C code. The
         parameters can then be loaded by calling the
         get_dsaXXX() function.

     -genkey
         this option will generate a DSA either using the
         specified or generated parameters.

     -rand file(s)
         a file or files containing random data used to seed the
         random number generator, or an EGD socket (see
         RAND_egd(3)).  Multiple files can be specified separated
         by a OS-dependent character.  The separator is ; for
         MS-Windows, , for OpenVMS, and : for all others.

     numbits
         this option specifies that a parameter set should be
         generated of size numbits. It must be the last option.
         If this option is included then the input file (if any)
         is ignored.



NOTES
     PEM format DSA parameters use the header and footer lines:

      -----BEGIN DSA PARAMETERS-----
      -----END DSA PARAMETERS-----

     DSA parameter generation is a slow process and as a result
     the same set of DSA parameters is often used to generate
     several distinct keys.



SEE ALSO
     gendsa(1), dsa(1), genrsa(1), rsa(1)









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Created 1996-2024 by Maxim Chirkov

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