=head1 SYNOPSIS
B<openssl> B<genpkey>
+[B<-help>]
[B<-out filename>]
[B<-outform PEM|DER>]
[B<-pass arg>]
=over 4
+=item B<-help>
+
+Print out a usage message.
+
=item B<-out filename>
-the output filename. If this argument is not specified then standard output is
-used.
+Output the key to the specified file. If this argument is not specified then
+standard output is used.
=item B<-outform DER|PEM>
=item B<-pass arg>
the output file password source. For more information about the format of B<arg>
-see the B<PASS PHRASE ARGUMENTS> section in L<openssl(1)|openssl(1)>.
+see the B<PASS PHRASE ARGUMENTS> section in L<openssl(1)>.
=item B<-cipher>
=item B<-genparam>
generate a set of parameters instead of a private key. If used this option must
-precede and B<-algorithm>, B<-paramfile> or B<-pkeyopt> options.
+precede any B<-algorithm>, B<-paramfile> or B<-pkeyopt> options.
=item B<-paramfile filename>
Some public key algorithms generate a private key based on a set of parameters.
They can be supplied using this option. If this option is used the public key
algorithm used is determined by the parameters. If used this option must
-precede and B<-pkeyopt> options. The options B<-paramfile> and B<-algorithm>
+precede any B<-pkeyopt> options. The options B<-paramfile> and B<-algorithm>
are mutually exclusive.
=item B<-text>
=head1 KEY GENERATION OPTIONS
-The options supported by each algorith and indeed each implementation of an
+The options supported by each algorithm and indeed each implementation of an
algorithm can vary. The options for the OpenSSL implementations are detailed
below.
The value to use for the generator B<g>.
+=item B<dh_rfc5114:num>
+
+If this option is set then the appropriate RFC5114 parameters are used
+instead of generating new parameters. The value B<num> can take the
+values 1, 2 or 3 corresponding to RFC5114 DH parameters consisting of
+1024 bit group with 160 bit subgroup, 2048 bit group with 224 bit subgroup
+and 2048 bit group with 256 bit subgroup as mentioned in RFC5114 sections
+2.1, 2.2 and 2.3 respectively.
+
=back
=head1 EC PARAMETER GENERATION OPTIONS
+The EC parameter generation options below can also
+be supplied as EC key generation options. This can (for example) generate a
+key from a named curve without the need to use an explicit parameter file.
+
=over 4
=item B<ec_paramgen_curve:curve>
-the EC curve to use.
+the EC curve to use. OpenSSL supports NIST curve names such as "P-256".
+
+=item B<ec_param_enc:encoding>
+
+the encoding to use for parameters. The "encoding" parameter must be either
+"named_curve" or "explicit".
=back
Gost 2001 support is not enabled by default. To enable this algorithm,
one should load the ccgost engine in the OpenSSL configuration file.
-See README.gost file in the engines/ccgost directiry of the source
+See README.gost file in the engines/ccgost directory of the source
distribution for more details.
Use of a parameter file for the GOST R 34.10 algorithm is optional.
=back
+=head1 X25519 KEY GENERATION OPTIONS
+
+The X25519 algorithm does not currently support any key generation options.
=head1 NOTES
Generate an RSA private key using default parameters:
- openssl genpkey -algorithm RSA -out key.pem
+ openssl genpkey -algorithm RSA -out key.pem
Encrypt output private key using 128 bit AES and the passphrase "hello":
Generate a 2048 bit RSA key using 3 as the public exponent:
openssl genpkey -algorithm RSA -out key.pem -pkeyopt rsa_keygen_bits:2048 \
- -pkeyopt rsa_keygen_pubexp:3
+ -pkeyopt rsa_keygen_pubexp:3
Generate 1024 bit DSA parameters:
openssl genpkey -genparam -algorithm DSA -out dsap.pem \
- -pkeyopt dsa_paramgen_bits:1024
+ -pkeyopt dsa_paramgen_bits:1024
Generate DSA key from parameters:
- openssl genpkey -paramfile dsap.pem -out dsakey.pem
+ openssl genpkey -paramfile dsap.pem -out dsakey.pem
Generate 1024 bit DH parameters:
openssl genpkey -genparam -algorithm DH -out dhp.pem \
- -pkeyopt dh_paramgen_prime_len:1024
+ -pkeyopt dh_paramgen_prime_len:1024
+
+Output RFC5114 2048 bit DH parameters with 224 bit subgroup:
+
+ openssl genpkey -genparam -algorithm DH -out dhp.pem -pkeyopt dh_rfc5114:2
Generate DH key from parameters:
- openssl genpkey -paramfile dhp.pem -out dhkey.pem
+ openssl genpkey -paramfile dhp.pem -out dhkey.pem
+Generate EC parameters:
-=cut
+ openssl genpkey -genparam -algorithm EC -out ecp.pem \
+ -pkeyopt ec_paramgen_curve:secp384r1 \
+ -pkeyopt ec_param_enc:named_curve
+Generate EC key from parameters:
+
+ openssl genpkey -paramfile ecp.pem -out eckey.pem
+
+Generate EC key directly:
+
+ openssl genpkey -algorithm EC -out eckey.pem \
+ -pkeyopt ec_paramgen_curve:P-384 \
+ -pkeyopt ec_param_enc:named_curve
+
+Generate an X25519 private key:
+
+ openssl genpkey -algorithm X25519 -out xkey.pem
+
+=head1 HISTORY
+
+The ability to use NIST curve names, and to generate an EC key directly,
+were added in OpenSSL 1.0.2.
+
+=head1 COPYRIGHT
+
+Copyright 2006-2016 The OpenSSL Project Authors. All Rights Reserved.
+
+Licensed under the OpenSSL license (the "License"). You may not use
+this file except in compliance with the License. You can obtain a copy
+in the file LICENSE in the source distribution or at
+L<https://www.openssl.org/source/license.html>.
+
+=cut
projects / cassiopeia.git / blobdiff