RAND(1)                              OpenSSL                             RAND(1)

       openssl-rand, rand - generate pseudo-random bytes

       openssl rand [-help] [-out file] [-rand file...]  [-writerand file]
       [-base64] [-hex] num

       This command generates num random bytes using a cryptographically secure
       pseudo random number generator (CSPRNG).

       The random bytes are generated using the RAND_bytes(3) function, which
       provides a security level of 256 bits, provided it managed to seed itself
       successfully from a trusted operating system entropy source.  Otherwise,
       the command will fail with a nonzero error code.  For more details, see
       RAND_bytes(3), RAND(7), and RAND_DRBG(7).

           Print out a usage message.

       -out file
           Write to file instead of standard output.

       -rand file...
           A file or files containing random data used to seed the random number
           generator.  Multiple files can be specified separated by an OS-
           dependent character.  The separator is ; for MS-Windows, , for
           OpenVMS, and : for all others.  Explicitly specifying a seed file is
           in general not necessary, see the "NOTES" section for more

       [-writerand file]
           Writes random data to the specified file upon exit.  This can be used
           with a subsequent -rand flag.

           Perform base64 encoding on the output.

           Show the output as a hex string.

       Prior to OpenSSL 1.1.1, it was common for applications to store
       information about the state of the random-number generator in a file that
       was loaded at startup and rewritten upon exit. On modern operating
       systems, this is generally no longer necessary as OpenSSL will seed
       itself from a trusted entropy source provided by the operating system.
       The -rand  and -writerand  flags are still supported for special
       platforms or circumstances that might require them.

       It is generally an error to use the same seed file more than once and
       every use of -rand should be paired with -writerand.

       RAND_bytes(3), RAND(7), RAND_DRBG(7)

       Copyright 2000-2020 The OpenSSL Project Authors. All Rights Reserved.

       Licensed under the OpenSSL license (the "License").  You may not use this
       file except in compliance with the License.  You can obtain a copy in the
       file LICENSE in the source distribution or at

1.1.1j                             2021-02-16                            RAND(1)