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8bf37709a4
Fixes #11742 Fixes #11764 The newer RSA sp800-56b algorithm is being used for the normal case of a non multiprime key of at least length 2048. Insecure key lengths and mutltiprime RSA will use the old method. Bad public exponents are no longer allowed (i.e values less than 65537 or even). Values such as 2 that would cause a infinite loop now result in an error. The value of 3 has been marked as deprecated but is still allowed for legacy purposes. Reviewed-by: Tomas Mraz <tmraz@fedoraproject.org> (Merged from https://github.com/openssl/openssl/pull/11765)
133 lines
3.4 KiB
Plaintext
133 lines
3.4 KiB
Plaintext
=pod
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{- OpenSSL::safe::output_do_not_edit_headers(); -}
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=head1 NAME
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openssl-genrsa - generate an RSA private key
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=head1 SYNOPSIS
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B<openssl> B<genrsa>
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[B<-help>]
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[B<-out> I<filename>]
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[B<-passout> I<arg>]
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[B<-aes128>]
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[B<-aes192>]
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[B<-aes256>]
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[B<-aria128>]
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[B<-aria192>]
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[B<-aria256>]
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[B<-camellia128>]
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[B<-camellia192>]
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[B<-camellia256>]
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[B<-des>]
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[B<-des3>]
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[B<-idea>]
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[B<-F4>]
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[B<-f4>]
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[B<-3>]
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[B<-primes> I<num>]
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[B<-verbose>]
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{- $OpenSSL::safe::opt_r_synopsis -}
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{- $OpenSSL::safe::opt_engine_synopsis -}
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{- $OpenSSL::safe::opt_provider_synopsis -}
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[B<numbits>]
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=for openssl ifdef engine 3
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=head1 DESCRIPTION
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This command has been deprecated.
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The L<openssl-genpkey(1)> command should be used instead.
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This command generates an RSA private key.
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=head1 OPTIONS
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=over 4
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=item B<-help>
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Print out a usage message.
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=item B<-out> I<filename>
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Output the key to the specified file. If this argument is not specified then
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standard output is used.
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=item B<-passout> I<arg>
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The output file password source. For more information about the format
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see L<openssl(1)/Pass Phrase Options>.
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=item B<-aes128>, B<-aes192>, B<-aes256>, B<-aria128>, B<-aria192>, B<-aria256>, B<-camellia128>, B<-camellia192>, B<-camellia256>, B<-des>, B<-des3>, B<-idea>
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These options encrypt the private key with specified
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cipher before outputting it. If none of these options is
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specified no encryption is used. If encryption is used a pass phrase is prompted
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for if it is not supplied via the B<-passout> argument.
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=item B<-F4>, B<-f4>, B<-3>
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The public exponent to use, either 65537 or 3. The default is 65537.
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The B<-3> option has been deprecated.
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=item B<-primes> I<num>
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Specify the number of primes to use while generating the RSA key. The I<num>
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parameter must be a positive integer that is greater than 1 and less than 16.
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If I<num> is greater than 2, then the generated key is called a 'multi-prime'
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RSA key, which is defined in RFC 8017.
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=item B<-verbose>
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Print extra details about the operations being performed.
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{- $OpenSSL::safe::opt_r_item -}
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{- $OpenSSL::safe::opt_engine_item -}
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{- $OpenSSL::safe::opt_provider_item -}
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=item B<numbits>
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The size of the private key to generate in bits. This must be the last option
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specified. The default is 2048 and values less than 512 are not allowed.
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=back
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=head1 NOTES
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RSA private key generation essentially involves the generation of two or more
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prime numbers. When generating a private key various symbols will be output to
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indicate the progress of the generation. A B<.> represents each number which
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has passed an initial sieve test, B<+> means a number has passed a single
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round of the Miller-Rabin primality test, B<*> means the current prime starts
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a regenerating progress due to some failed tests. A newline means that the number
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has passed all the prime tests (the actual number depends on the key size).
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Because key generation is a random process the time taken to generate a key
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may vary somewhat. But in general, more primes lead to less generation time
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of a key.
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=head1 SEE ALSO
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L<openssl(1)>,
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L<openssl-genpkey(1)>,
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L<openssl-gendsa(1)>
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=head1 HISTORY
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This command was deprecated in OpenSSL 3.0.
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=head1 COPYRIGHT
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Copyright 2000-2020 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the Apache License 2.0 (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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