Crypt::OpenSSL::Random − OpenSSL/LibreSSL pseudo−random number generator access
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);
"Crypt::OpenSSL::Random" provides the ability to seed and query the OpenSSL and LibreSSL library’s pseudo-random number generators.
Note: On LibreSSL "random_egd()" is not defined.
None by default.
random_bytes ( IV num_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 ( IV num_bytes)
This function, is similar to "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 ( PV random_bytes_string)
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 ( PV egd_string)
This function seeds the PRNG with data from the specified entropy gathering daemon. Returns the number of bytes read from the daemon on success, or "−1" if not enough bytes were read, or if the connection to the daemon failed.
"libressl" considers this function insecure, so with libressl this function does not exist.
This function returns true if the PRNG has sufficient seeding.
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.
Ian Robertson, "firstname.lastname@example.org"
Now maintained by Reini Urban, "email@example.com"
This module is available under the same licences as perl, the Artistic license and the GPL.
perl(1), rand(3), RAND_add(3), RAND_egd(3), RAND_bytes(3).