| =pod |
| {- OpenSSL::safe::output_do_not_edit_headers(); -} |
| |
| =head1 NAME |
| |
| openssl-rand - generate pseudo-random bytes |
| |
| =head1 SYNOPSIS |
| |
| B<openssl rand> |
| [B<-help>] |
| [B<-out> I<file>] |
| [B<-base64>] |
| [B<-hex>] |
| {- $OpenSSL::safe::opt_engine_synopsis -} |
| {- $OpenSSL::safe::opt_r_synopsis -} |
| {- $OpenSSL::safe::opt_provider_synopsis -} |
| I<num> |
| |
| =for openssl ifdef engine |
| |
| =head1 DESCRIPTION |
| |
| This command generates I<num> random bytes using a cryptographically |
| secure pseudo random number generator (CSPRNG). |
| |
| The random bytes are generated using the L<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 L<RAND_bytes(3)>, L<RAND(7)>, and L<RAND_DRBG(7)>. |
| |
| =head1 OPTIONS |
| |
| =over 4 |
| |
| =item B<-help> |
| |
| Print out a usage message. |
| |
| =item B<-out> I<file> |
| |
| Write to I<file> instead of standard output. |
| |
| =item B<-base64> |
| |
| Perform base64 encoding on the output. |
| |
| =item B<-hex> |
| |
| Show the output as a hex string. |
| |
| {- $OpenSSL::safe::opt_engine_item -} |
| |
| {- $OpenSSL::safe::opt_r_item -} |
| |
| {- $OpenSSL::safe::opt_provider_item -} |
| |
| =back |
| |
| =head1 SEE ALSO |
| |
| L<openssl(1)>, |
| L<RAND_bytes(3)>, |
| L<RAND(7)>, |
| L<RAND_DRBG(7)> |
| |
| =head1 COPYRIGHT |
| |
| Copyright 2000-2020 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 |
| L<https://www.openssl.org/source/license.html>. |
| |
| =cut |
