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GENRSA(1)                           OpenSSL                          GENRSA(1)

N
       genrsa - generate an RSA private key

S
       ooppeennssssll ggeennrrssaa [--oouutt ffiilleennaammee] [--ppaassssoouutt aarrgg] [--ddeess] [--ddeess33] [--iiddeeaa]
       [--ff44] [--33] [--rraanndd file((ss))] [--eennggiinnee iidd] [nnuummbbiittss]

D
       The ggeennrrssaa command generates an RSA private key.

O
       --oouutt ffiilleennaammee
           the output filename. If this argument is not specified then stan-
           dard output is used.

       --ppaassssoouutt aarrgg
           the output file password source. For more information about the
           format of aarrgg see the PPAASSSS PPHHRRAASSEE AARRGGUUMMEENNTTSS section in openssl(1).

       --ddeess||--ddeess33||--iiddeeaa
           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
           --ppaassssoouutt argument.

       --FF44||--33
           the public exponent to use, either 65537 or 3. The default is
           65537.

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

       --eennggiinnee iidd
           specifying an engine (by it's unique iidd string) will cause rreeqq 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.

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

N
       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.

B
       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 rea-
       sons they will be much larger (typically 1024 bits).

S
       gendsa(1)

3rd Berkeley Distribution           0.9.7a                           GENRSA(1)

N | S | D | O | N | B | S

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