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GENPKEY(1)                          OpenSSL                         GENPKEY(1)



NAME
       genpkey - generate a private key

SYNOPSIS
       openssl genpkey [-out filename] [-outform PEM|DER] [-pass arg] [-cipher] [-engine
       id] [-paramfile file] [-algorithm alg] [-pkeyopt opt:value] [-genparam] [-text]

DESCRIPTION
       The genpkey command generates a private key.

OPTIONS
       -out filename
           the output filename. If this argument is not specified then standard output is
           used.

       -outform DER|PEM
           This specifies the output format DER or PEM.

       -pass arg
           the output file password source. For more information about the format of arg
           see the PASS PHRASE ARGUMENTS section in openssl(1).

       -cipher
           This option encrypts the private key with the supplied cipher. Any algorithm
           name accepted by EVP_get_cipherbyname() is acceptable such as des3.

       -engine id
           specifying an engine (by its unique id string) will cause 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.

       -algorithm alg
           public key algorithm to use such as RSA, DSA or DH. If used this option must
           precede any -pkeyopt options. The options -paramfile and -algorithm are
           mutually exclusive.

       -pkeyopt opt:value
           set the public key algorithm option opt to value. The precise set of options
           supported depends on the public key algorithm used and its implementation. See
           KEY GENERATION OPTIONS below for more details.

       -genparam
           generate a set of parameters instead of a private key. If used this option must
           precede and -algorithm, -paramfile or -pkeyopt options.

       -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 -pkeyopt options. The options -paramfile and -algorithm are
           mutually exclusive.

       -text
           Print an (unencrypted) text representation of private and public keys and
           parameters along with the PEM or DER structure.

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.

RSA KEY GENERATION OPTIONS
       rsa_keygen_bits:numbits
           The number of bits in the generated key. If not specified 1024 is used.

       rsa_keygen_pubexp:value
           The RSA public exponent value. This can be a large decimal or hexadecimal value
           if preceded by 0x. Default value is 65537.

DSA PARAMETER GENERATION OPTIONS
       dsa_paramgen_bits:numbits
           The number of bits in the generated parameters. If not specified 1024 is used.

DH PARAMETER GENERATION OPTIONS
       dh_paramgen_prime_len:numbits
           The number of bits in the prime parameter p.

       dh_paramgen_generator:value
           The value to use for the generator g.

EC PARAMETER GENERATION OPTIONS
       ec_paramgen_curve:curve
           the EC curve to use.

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.

       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

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.

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



1.0.1e                            2013-02-11                        GENPKEY(1)

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