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GENRSA(1)                           OpenSSL                          GENRSA(1)



NAME
       genrsa - generate an RSA private key

SYNOPSIS
       openssl genrsa [-out filename] [-passout arg] [-des] [-des3] [-idea] [-f4] [-3]
       [-rand file(s)] [-engine id] [numbits]

DESCRIPTION
       The genrsa command generates an RSA private key.

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

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

       -des|-des3|-idea
           These options encrypt the private key with the DES, triple DES, or the IDEA
           ciphers respectively before outputting it. If none of these options is
           specified no encryption is used. If encryption is used a pass phrase is
           prompted for if it is not supplied via the -passout argument.

       -F4|-3
           the public exponent to use, either 65537 or 3. The default is 65537.

       -rand file(s)
           a file or files containing random data used to seed the random number
           generator, or an EGD socket (see RAND_egd(3)).  Multiple files can be specified
           separated by a OS-dependent character.  The separator is ; for MS-Windows, ,
           for OpenVMS, and : for all others.

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

       numbits
           the size of the private key to generate in bits. This must be the last option
           specified. The default is 512.

NOTES
       RSA private key generation essentially involves the generation of two prime
       numbers. When generating a private key various symbols will be output to indicate
       the progress of the generation. A . represents each number which has passed an
       initial sieve test, + means a number has passed a single round of the Miller-Rabin
       primality test. A newline means that the number has passed all the prime tests (the
       actual number depends on the key size).

       Because key generation is a random process the time taken to generate a key may
       vary somewhat.

BUGS
       A quirk of the prime generation algorithm is that it cannot generate small primes.
       Therefore the number of bits should not be less that 64. For typical private keys
       this will not matter because for security reasons they will be much larger
       (typically 1024 bits).

SEE ALSO
       gendsa(1)



1.0.1e                            2013-02-11                         GENRSA(1)

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