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+=pod
+
+=head1 NAME
+
+genpkey - generate a private key
+
+=head1 SYNOPSIS
+
+B<openssl> B<genpkey>
+[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<-out filename>
+
+the output filename. 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)|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 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. 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
+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.
+
+=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>.
+
+=back
+
+=head1 EC PARAMETER GENERATION OPTIONS
+
+=over 4
+
+=item B<ec_paramgen_curve:curve>
+
+the EC curve to use.
+
+=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 directiry 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
+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
+
+Generate DH key from parameters:
+
+ openssl genpkey -paramfile dhp.pem -out dhkey.pem 
+
+
+=cut
+