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genrsa(1ssl)


NAME

   genrsa - generate an RSA private key

SYNOPSIS

   openssl genrsa [-out filename] [-passout arg] [-aes128] [-aes192]
   [-aes256] [-camellia128] [-camellia192] [-camellia256] [-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).

   -aes128|-aes192|-aes256|-camellia128|-camellia192|-camellia256|-des|-des3|-idea
       These options encrypt the private key with specified cipher 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)



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