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Crypt::OpenSSL::Random.3pm
Langue: en
Version: 2007-05-20 (ubuntu - 07/07/09)
Section: 3 (Bibliothèques de fonctions)
NAME
Crypt::OpenSSL::RSA - RSA encoding and decoding, using the openSSL librariesCrypt::OpenSSL::Random - Routines for accessing the OpenSSL pseudo-random number generator
SYNOPSIS
use Crypt::OpenSSL::Random; Crypt::OpenSSL::Random::random_seed($good_random_data); Crypt::OpenSSL::Random::random_egd("/tmp/entropy"); Crypt::OpenSSL::Random::random_status() or die "Unable to sufficiently seed the random number generator". my $ten_good_random_bytes = Crypt::OpenSSL::Random::random_bytes(10); my $ten_ok_random_bytes = Crypt::OpenSSL::Random::random_pseudo_bytes(10);
DESCRIPTION
Crypt::OpenSSL::Random provides the ability to seed and query the OpenSSL library's pseudo-random number generatorEXPORT
None by default.Static Methods
- random_bytes
- This function, returns a specified number of cryptographically strong pseudo-random bytes from the PRNG. If the PRNG has not been seeded with enough randomness to ensure an unpredictable byte sequence, then a false value is returned.
- random_pseudo_bytes
- This function, is similar to c<random_bytes>, but the resulting sequence of bytes are not necessarily unpredictable. They can be used for non-cryptographic purposes and for certain purposes in cryptographic protocols, but usually not for key generation etc.
- random_seed
- This function seeds the PRNG with a supplied string of bytes. It returns true if the PRNG has sufficient seeding. Note: calling this function with non-random bytes is of limited value at best!
- random_egd
- This function seeds the PRNG with data from the specified entropy gathering daemon. Returns the number of bytes read from the daemon on succes, or -1 if not enough bytes were read, or if the connection to the daemon failed.
- random_status
- This function returns true if the PRNG has sufficient seeding.
BUGS
Because of the internal workings of OpenSSL's random library, the pseudo-random number generator (PRNG) accessed by Crypt::OpenSSL::Random will be different than the one accessed by any other perl module. Hence, to use a module such as Crypt::OpenSSL::Random, you will need to seed the PRNG used there from one used here. This class is still advantageous, however, as it centralizes other methods, such as random_egd, in one place.AUTHOR
Ian Robertson, iroberts@cpan.comSEE ALSO
perl(1), rand(3), RAND_add(3), RAND_egd(3), RAND_bytes(3).POD ERRORS
Hey! The above document had some coding errors, which are explained below:- Around line 62:
- '=item' outside of any '=over'
- Around line 93:
- You forgot a '=back' before '=head1'
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