3ee1eac27a
Standardized the -rand flag and added a new one:
-rand file...
Always reads the specified files
-writerand file
Always writes to the file on exit
For apps that use a config file, the RANDFILE config parameter reads
the file at startup (to seed the RNG) and write to it on exit if
the -writerand flag isn't used.
Ensured that every app that took -rand also took -writerand, and
made sure all of that agreed with all the documentation.
Fix error reporting in write_file and -rand
Reviewed-by: Paul Dale <paul.dale@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/3862)
75 lines
1.6 KiB
Text
75 lines
1.6 KiB
Text
=pod
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=head1 NAME
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rand - generate pseudo-random bytes
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=head1 SYNOPSIS
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B<openssl rand>
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[B<-help>]
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[B<-out> I<file>]
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[B<-rand file...>]
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[B<-writerand file>]
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[B<-base64>]
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[B<-hex>]
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I<num>
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=head1 DESCRIPTION
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The B<rand> command outputs I<num> pseudo-random bytes after seeding
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the random number generator once. As in other B<openssl> command
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line tools, PRNG seeding uses the file I<$HOME/>B<.rnd> or B<.rnd>
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in addition to the files given in the B<-rand> option. A new
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I<$HOME>/B<.rnd> or B<.rnd> file will be written back if enough
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seeding was obtained from these sources.
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=head1 OPTIONS
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=over 4
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=item B<-help>
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Print out a usage message.
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=item B<-out file>
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Write to I<file> instead of standard output.
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=item B<-rand file...>
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A file or files containing random data used to seed the random number
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generator.
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Multiple files can be specified separated by an OS-dependent character.
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The separator is B<;> for MS-Windows, B<,> for OpenVMS, and B<:> for
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all others.
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=item [B<-writerand file>]
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Writes random data to the specified I<file> upon exit.
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This can be used with a subsequent B<-rand> flag.
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=item B<-base64>
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Perform base64 encoding on the output.
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=item B<-hex>
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Show the output as a hex string.
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=back
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=head1 SEE ALSO
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L<RAND_bytes(3)>
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=head1 COPYRIGHT
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Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the OpenSSL license (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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