=item B<-out filename>
the output filename. If this argument is not specified then standard output is
-used.
+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>
-These options encrypt the private key with the supplied cipher. Any algorithm
+This option encrypts the private key with the supplied cipher. Any algorithm
name accepted by EVP_get_cipherbyname() is acceptable such as B<des3>.
=item B<-engine id>
-specifying an engine (by it's unique B<id> string) will cause B<req>
+specifying an engine (by its unique B<id> string) will cause B<genpkey>
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.
+for all available algorithms. If used this option should precede all other
+options.
=item B<-algorithm alg>
-public key algorithm to use such as RSA, DSA or DH.
+public key algorithm to use such as RSA, DSA or DH. If used this option must
+precede any B<-pkeyopt> options. The options B<-paramfile> and B<-algorithm>
+are mutually exclusive.
=item B<-pkeyopt opt:value>
=item B<-genparam>
-generate a set of parameters instead of a private key.
+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.
=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.
+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>
+are mutually exclusive.
+
+=item B<-text>
+
+Print an (unencrypted) text representation of private and public keys and
+parameters along with the PEM or DER structure.
=back
=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 number of bits in the generated parameters. If not specified 1024 is used.
+=back
+
=head1 DH PARAMETER GENERATION OPTIONS
=over 4
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
+In OpenSSL 1.0.2 and later 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 1.0.2 and later 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
+
+=head1 GOST2001 KEY GENERATION AND PARAMETER OPTIONS
+
+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 directory of the source
+distribution for more details.
+
+Use of a parameter file for the GOST R 34.10 algorithm is optional.
+Parameters can be specified during key generation directly as well as
+during generation of parameter file.
+
+=over 4
+
+=item B<paramset:name>
+
+Specifies GOST R 34.10-2001 parameter set according to RFC 4357.
+Parameter set can be specified using abbreviated name, object short name or
+numeric OID. Following parameter sets are supported:
+
+ paramset OID Usage
+ A 1.2.643.2.2.35.1 Signature
+ B 1.2.643.2.2.35.2 Signature
+ C 1.2.643.2.2.35.3 Signature
+ XA 1.2.643.2.2.36.0 Key exchange
+ XB 1.2.643.2.2.36.1 Key exchange
+ test 1.2.643.2.2.35.0 Test purposes
=back
+
+
=head1 NOTES
The use of the genpkey program is encouraged over the algorithm specific
Generate an RSA private key using default parameters:
- openssl genpkey -algoritm RSA -out key.pem
+ openssl genpkey -algorithm RSA -out key.pem
Encrypt output private key using 128 bit AES and the passphrase "hello":
- openssl genpkey -algoritm RSA -out key.pem -aes-128-cbc -pass pass:hello
+ openssl genpkey -algorithm RSA -out key.pem -aes-128-cbc -pass pass:hello
Generate a 2048 bit RSA key using 3 as the public exponent:
- openssl genpkey -algoritm RSA -out key.pem -pkeyopt rsa_keygen_bits:2048 \
+ openssl genpkey -algorithm RSA -out key.pem -pkeyopt rsa_keygen_bits:2048 \
-pkeyopt rsa_keygen_pubexp:3
Generate 1024 bit DSA parameters:
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
+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:
+
+ 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 1.0.2+ only):
+ openssl genpkey -algorithm EC -out eckey.pem \
+ -pkeyopt ec_paramgen_curve:P-384 \
+ -pkeyopt ec_param_enc:named_curve
=cut
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