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.
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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