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+=pod
+
+=head1 NAME
+
+openssl-genpkey,
+genpkey - generate a private key
+
+=head1 SYNOPSIS
+
+B<openssl> B<genpkey>
+[B<-help>]
+[B<-out filename>]
+[B<-outform PEM|DER>]
+[B<-pass arg>]
+[B<-cipher>]
+[B<-engine id>]
+[B<-paramfile file>]
+[B<-algorithm alg>]
+[B<-pkeyopt opt:value>]
+[B<-genparam>]
+[B<-text>]
+
+=head1 DESCRIPTION
+
+The B<genpkey> command generates a private key.
+
+=head1 OPTIONS
+
+=over 4
+
+=item B<-help>
+
+Print out a usage message.
+
+=item B<-out filename>
+
+Output the key to the specified file. If this argument is not specified then
+standard output is used.
+
+=item B<-outform DER|PEM>
+
+This specifies the output format DER or 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)>.
+
+=item B<-cipher>
+
+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 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. If used this option should precede all other
+options.
+
+=item B<-algorithm alg>
+
+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>
+
+set the public key algorithm option B<opt> to B<value>. The precise set of
+options supported depends on the public key algorithm used and its
+implementation. See B<KEY GENERATION OPTIONS> below for more details.
+
+=item B<-genparam>
+
+generate a set of parameters instead of a private key. If used this option must
+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 any 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 algorithm and indeed each implementation of an
+algorithm can vary. The options for the OpenSSL implementations are detailed
+below.
+
+=head1 RSA KEY GENERATION OPTIONS
+
+=over 4
+
+=item B<rsa_keygen_bits:numbits>
+
+The number of bits in the generated key. If not specified 1024 is used.
+
+=item B<rsa_keygen_pubexp:value>
+
+The RSA public exponent value. This can be a large decimal or
+hexadecimal value if preceded by B<0x>. Default value is 65537.
+
+=back
+
+=head1 DSA PARAMETER GENERATION OPTIONS
+
+=over 4
+
+=item B<dsa_paramgen_bits:numbits>
+
+The number of bits in the generated parameters. If not specified 1024 is used.
+
+=back
+
+=head1 DH PARAMETER GENERATION OPTIONS
+
+=over 4
+
+=item B<dh_paramgen_prime_len:numbits>
+
+The number of bits in the prime parameter B<p>.
+
+=item B<dh_paramgen_generator:value>
+
+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. 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
+
+=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 X25519 KEY GENERATION OPTIONS
+
+The X25519 algorithm does not currently support any key generation options.
+
+
+=head1 NOTES
+
+The use of the genpkey program is encouraged over the algorithm specific
+utilities because additional algorithm options and ENGINE provided algorithms
+can be used.
+
+=head1 EXAMPLES
+
+Generate an RSA private key using default parameters:
+
+ openssl genpkey -algorithm RSA -out key.pem
+
+Encrypt output private key using 128 bit AES and the passphrase "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 -algorithm RSA -out key.pem -pkeyopt rsa_keygen_bits:2048 \
+ -pkeyopt rsa_keygen_pubexp:3
+
+Generate 1024 bit DSA parameters:
+
+ openssl genpkey -genparam -algorithm DSA -out dsap.pem \
+ -pkeyopt dsa_paramgen_bits:1024
+
+Generate DSA key from parameters:
+
+ 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
+
+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 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