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102 lines
2.7 KiB
102 lines
2.7 KiB
=pod |
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=head1 NAME |
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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<-out filename>] |
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[B<-passout arg>] |
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[B<-aes128>] |
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[B<-aes192>] |
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[B<-aes256>] |
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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<-3>] |
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[B<-rand file(s)>] |
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[B<-engine id>] |
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[B<numbits>] |
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=head1 DESCRIPTION |
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The B<genrsa> command generates an RSA 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<-passout 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<-aes128|-aes192|-aes256|-camellia128|-camellia192|-camellia256|-des|-des3|-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|-3> |
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the public exponent to use, either 65537 or 3. The default is 65537. |
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=item B<-rand file(s)> |
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a file or files containing random data used to seed the random number |
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generator, or an EGD socket (see L<RAND_egd(3)|RAND_egd(3)>). |
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Multiple files can be specified separated by a OS-dependent character. |
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The separator is B<;> for MS-Windows, B<,> for OpenVMS, and B<:> for |
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all others. |
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=item B<-engine id> |
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specifying an engine (by its unique B<id> string) will cause B<genrsa> |
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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. |
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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 512. |
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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 prime |
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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. A newline means that the number has |
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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. |
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=head1 BUGS |
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A quirk of the prime generation algorithm is that it cannot generate small |
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primes. Therefore the number of bits should not be less that 64. For typical |
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private keys this will not matter because for security reasons they will |
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be much larger (typically 1024 bits). |
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=head1 SEE ALSO |
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L<gendsa(1)|gendsa(1)> |
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=cut |
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