NAME
rand - generate pseudo-random bytes
SYNOPSIS
openssl rand [-out file] [-rand 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
- -out file
-
Write to file instead of standard output.
- -rand file()
-
Use specified file or files or EGD socket (see RAND_egd()) for seeding the random number generator. Multiple files can be specified separated by a OS-dependent character. The separator is ; for MS-Windows, , for OpenVMS, and : for all others.
- -base64
-
Perform base64 encoding on the output.
- -hex
-
Show the output as a hex string.
EXAMPLE
Generate 32 random bytes to stdout, encoded in base64:
# openssl rand -base64 32 cYDKgmlGomtHY5hV2C6lbpBK9KH6/Kd0UW4BhHT3cUw=
