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 (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 it's unique
id string) will cause req 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)