NAME¶
Crypt::OpenSSL::RSA - RSA encoding and decoding, using the openSSL libraries
Crypt::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 generator
EXPORT¶
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.com
SEE 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'