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dsaparam(1ssl)


NAME

  dsaparam - DSA parameter manipulation and generation


SYNOPSIS

  openssl dsaparam [-inform DER | PEM] [-outform DER | PEM] [-in filename]
  [-out filename] [-noout] [-text] [-C] [-rand filename] [-genkey] [numbits]


OPTIONS

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

  -in filename
	  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
	  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  Inhibits the output of the encoded version of the parameters.

  -text	  Prints out the DSA parameters in human readable form.

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

  -genkey Generates 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 an OS-dependent character. The
	  separator is a semicolon (;) for MS-Windows, a comma (,) for
	  OpenVMS, and a colon (:) for all others.

  numbits 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.


DESCRIPTION

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


NOTES

  PEM format DSA parameters use the following 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

  Commands: gendsa(1ssl), dsa(1ssl), genrsa(1ssl), rsa(1ssl)

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