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)