182 lines
4.3 KiB
Text
182 lines
4.3 KiB
Text
=pod
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=head1 NAME
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genpkey - generate a private key
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=head1 SYNOPSIS
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B<openssl> B<genpkey>
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[B<-out filename>]
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[B<-outform PEM|DER>]
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[B<-pass arg>]
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[B<-cipher>]
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[B<-engine id>]
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[B<-paramfile file>]
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[B<-algorithm alg>]
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[B<-pkeyopt opt:value>]
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[B<-genparam>]
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[B<-text>]
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=head1 DESCRIPTION
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The B<genpkey> command generates a private key.
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=head1 OPTIONS
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=over 4
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=item B<-out filename>
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the output filename. If this argument is not specified then standard output is
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used.
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=item B<-outform DER|PEM>
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This specifies the output format DER or PEM.
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=item B<-pass arg>
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the output file password source. For more information about the format of B<arg>
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see the B<PASS PHRASE ARGUMENTS> section in L<openssl(1)|openssl(1)>.
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=item B<-cipher>
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This option encrypts the private key with the supplied cipher. Any algorithm
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name accepted by EVP_get_cipherbyname() is acceptable such as B<des3>.
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=item B<-engine id>
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specifying an engine (by it's unique B<id> string) will cause B<req>
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to attempt to obtain a functional reference to the specified engine,
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thus initialising it if needed. The engine will then be set as the default
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for all available algorithms. If used this option should precede all other
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options.
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=item B<-algorithm alg>
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public key algorithm to use such as RSA, DSA or DH. If used this option must
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precede any B<-pkeyopt> options. The options B<-paramfile> and B<-algorithm>
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are mutually exclusive.
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=item B<-pkeyopt opt:value>
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set the public key algorithm option B<opt> to B<value>. The precise set of
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options supported depends on the public key algorithm used and its
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implementation. See B<KEY GENERATION OPTIONS> below for more details.
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=item B<-genparam>
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generate a set of parameters instead of a private key. If used this option must
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precede and B<-algorithm>, B<-paramfile> or B<-pkeyopt> options.
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=item B<-paramfile filename>
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Some public key algorithms generate a private key based on a set of parameters.
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They can be supplied using this option. If this option is used the public key
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algorithm used is determined by the parameters. If used this option must
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precede and B<-pkeyopt> options. The options B<-paramfile> and B<-algorithm>
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are mutually exclusive.
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=item B<-text>
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Print an (unencrypted) text representation of private and public keys and
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parameters along with the PEM or DER structure.
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=back
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=head1 KEY GENERATION OPTIONS
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The options supported by each algorith and indeed each implementation of an
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algorithm can vary. The options for the OpenSSL implementations are detailed
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below.
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=head1 RSA KEY GENERATION OPTIONS
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=over 4
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=item B<rsa_keygen_bits:numbits>
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The number of bits in the generated key. If not specified 1024 is used.
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=item B<rsa_keygen_pubexp:value>
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The RSA public exponent value. This can be a large decimal or
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hexadecimal value if preceded by B<0x>. Default value is 65537.
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=back
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=head1 DSA PARAMETER GENERATION OPTIONS
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=over 4
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=item B<dsa_paramgen_bits:numbits>
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The number of bits in the generated parameters. If not specified 1024 is used.
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=head1 DH PARAMETER GENERATION OPTIONS
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=over 4
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=item B<dh_paramgen_prime_len:numbits>
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The number of bits in the prime parameter B<p>.
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=item B<dh_paramgen_generator:value>
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The value to use for the generator B<g>.
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=back
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=head1 EC PARAMETER GENERATION OPTIONS
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=over 4
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=item B<ec_paramgen_curve:curve>
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the EC curve to use.
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=back
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=head1 NOTES
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The use of the genpkey program is encouraged over the algorithm specific
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utilities because additional algorithm options and ENGINE provided algorithms
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can be used.
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=head1 EXAMPLES
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Generate an RSA private key using default parameters:
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openssl genpkey -algoritm RSA -out key.pem
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Encrypt output private key using 128 bit AES and the passphrase "hello":
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openssl genpkey -algoritm RSA -out key.pem -aes-128-cbc -pass pass:hello
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Generate a 2048 bit RSA key using 3 as the public exponent:
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openssl genpkey -algoritm RSA -out key.pem -pkeyopt rsa_keygen_bits:2048 \
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-pkeyopt rsa_keygen_pubexp:3
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Generate 1024 bit DSA parameters:
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openssl genpkey -genparam -algorithm DSA -out dsap.pem \
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-pkeyopt dsa_paramgen_bits:1024
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Generate DSA key from parameters:
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openssl genpkey -paramfile dsap.pem -out dsakey.pem
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Generate 1024 bit DH parameters:
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openssl genpkey -genparam -algorithm DH -out dhp.pem \
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-pkeyopt dh_paramgen_prime_len:1024
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Generate DH key from parameters:
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openssl genpkey -paramfile dhp.pem -out dhkey.pem
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=cut
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