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DSAPARAM(1)                  OpenSSL                  DSAPARAM(1)



NAME

       dsaparam - DSA parameter manipulation and generation


LIBRARY

       libcrypto, -lcrypto


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 parame-
       ter 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 for-
           mat: 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 speci-
           fied. 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



2001-04-12                    0.9.6g                            1





DSAPARAM(1)                  OpenSSL                  DSAPARAM(1)


           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 sepa-
           rated 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

       openssl_gendsa(1), openssl_dsa(1), openssl_genrsa(1),
       openssl_rsa(1)





























2001-04-12                    0.9.6g                            2