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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 file(s)] [-genkey]
   [-engine id] [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.

   -engine id
       specifying an engine (by its unique id string) will cause dsaparam
       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.

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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