OpenSSL

Cryptography and SSL/TLS Toolkit

rand

NAME

openssl-rand, rand - generate pseudo-random bytes

SYNOPSIS

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

DESCRIPTION

The rand command outputs num pseudo-random bytes after seeding the random number generator once. As in other openssl command line tools, PRNG seeding uses the file $HOME/.rnd or .rnd in addition to the files given in the -rand option. A new $HOME/.rnd or .rnd file will be written back if enough seeding was obtained from these sources.

OPTIONS

-help

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.

[-writerand file]

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

-base64

Perform base64 encoding on the output.

-hex

Show the output as a hex string.

SEE ALSO

RAND_bytes(3)

Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the Apache License 2.0 (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 https://www.openssl.org/source/license.html.