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Crypt::URandom(3pm) User Contributed Perl Documentation Crypt::URandom(3pm)
NAME
Crypt::URandom - Provide non blocking randomness
VERSION
This document describes Crypt::URandom version 0.36
SYNOPSIS
use Crypt::URandom();
my $random_string_50_bytes_long = Crypt::URandom::urandom(50);
OR
use Crypt::URandom qw( urandom );
my $random_string_50_bytes_long = urandom(50);
DESCRIPTION
This Module is intended to provide an interface to the strongest available source of non-
blocking randomness on the current platform. Platforms currently supported are anything
supporting /dev/urandom and versions of Windows greater than or equal to Windows 2000.
SUBROUTINES/METHODS
"urandom"
This function accepts an integer and returns a string of the same size filled with
random data. The first call will initialize the native cryptographic libraries (if
necessary) and load all the required Perl libraries
DIAGNOSTICS
"No secure alternative for random number generation for Win32 versions older than W2K"
The module cannot run on versions of Windows earlier than Windows 2000 as there is no
cryptographic functions provided by the operating system.
"Could not import CryptAcquireContext"
The module was unable to load the CryptAcquireContextA function from the advapi32
dynamic library. The advapi32 library cannot probably be loaded.
"CryptAcquireContext failed"
The module was unable to call the CryptAcquireContextA function from the advapi32
dynamic library.
"Could not import CryptGenRandom"
The module was unable to load the CryptGenRandom function from the advapi32 dynamic
library.
"Could not import SystemFunction036"
The module was unable to load the SystemFunction036 function from the advapi32 dynamic
library.
"The length argument must be supplied and must be an integer"
The get method must be called with an integer argument to describe how many random
bytes are required.
"CryptGenRandom failed"
The Windows 2000 CryptGenRandom method call failed to generate the required amount of
randomness
"RtlGenRand failed"
The post Windows 2000 RtlGenRand method call failed to generate the required amount of
randomness
"Only read n bytes from path"
The /dev/urandom device did not return the desired amount of random bytes
"Failed to read from path"
The /dev/urandom device returned an error when being read from
"Failed to open path"
The /dev/urandom device returned an error when being opened
CONFIGURATION AND ENVIRONMENT
Crypt::URandom requires no configuration files or environment variables.
DEPENDENCIES
If the platform is Win32, the Win32::API module will be required. Otherwise no other
modules other than those provided by perl will be required
INCOMPATIBILITIES
None reported.
BUGS AND LIMITATIONS
No bugs have been reported.
Please report any bugs or feature requests to "bug-crypt-urandom AT rt.org", or through
the web interface at <http://rt.cpan.org>.
AUTHOR
David Dick "<ddick AT cpan.org>"
ACKNOWLEDGEMENTS
The Win32::API code for interacting with Microsoft's CryptoAPI was stolen with extreme
gratitude from Crypt::Random::Source::Strong::Win32 by Max Kanat-Alexander
LICENSE AND COPYRIGHT
Copyright (c) 2011, David Dick "<ddick AT cpan.org>". All rights reserved.
This module is free software; you can redistribute it and/or modify it under the same
terms as Perl itself.
DISCLAIMER OF WARRANTY
BECAUSE THIS SOFTWARE IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY FOR THE SOFTWARE,
TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE
COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE SOFTWARE "AS IS" WITHOUT WARRANTY OF
ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO
THE QUALITY AND PERFORMANCE OF THE SOFTWARE IS WITH YOU. SHOULD THE SOFTWARE PROVE
DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR, OR CORRECTION.
IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING WILL ANY COPYRIGHT
HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR REDISTRIBUTE THE SOFTWARE AS PERMITTED BY
THE ABOVE LICENCE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL,
INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE
SOFTWARE (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR
LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE SOFTWARE TO OPERATE WITH ANY
OTHER SOFTWARE), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
SUCH DAMAGES.
perl v5.20.2 2015-06-01 Crypt::URandom(3pm)
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