rand: added.
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73
rand/rand
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73
rand/rand
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#!/bin/bash
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: <<=cut
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=pod
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=head1 NAME
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rand - Generate (pseudo-)random data
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=head1 SYNOPSIS
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B<rand>
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=head1 DESCRIPTION
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B<rand> uses B<openssl> to generate pseudorandom data. Just like B<cat
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/dev/urandom> it generates an infinite amount of data, but it is much
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faster (400 MB/s on hardware from 2013).
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The quality is lower as there are only 2^256 different tables (this is
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still around the number of atoms in the visible universe).
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=head1 EXAMPLE
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Overwrite a harddisk with random data:
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rand >/dev/sda
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=head1 AUTHOR
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Copyright (C) 2016 Ole Tange,
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http://ole.tange.dk and Free Software Foundation, Inc.
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=head1 LICENSE
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Copyright (C) 2012 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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at your option any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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=head1 DEPENDENCIES
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B<rand> uses B<openssl>.
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=head1 SEE ALSO
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B<openssl>
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=cut
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# Generate random 8-bit data by AES encrypting /dev/zero with a random
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# key
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key=$(openssl rand -hex 16)
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iv=$(openssl rand -hex 16)
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< /dev/zero openssl enc -aes-128-ctr -K $key -iv $iv 2>/dev/null
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