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CRYPT::OPENSSL::RANDOM(3PM) - Linux man page online | Library functions

OpenSSL/LibreSSL pseudo-random number generator access.

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2018-02-05
Random(3pm) User Contributed Perl Documentation Random(3pm)

NAME

Crypt::OpenSSL::Random - OpenSSL/LibreSSL pseudo-random number generator access

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 and LibreSSL library's pseudo-random number generators. Note: On LibreSSL "random_egd()" is not defined. EXPORT None by default. Static Methods 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 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 (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. 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, "@cpan.com" Now maintained by Reini Urban, "@cpan.org"

LICENSE

This module is available under the same licences as perl, the Artistic license and the GPL.

SEE ALSO

perl(1), rand(3), RAND_add(3), RAND_egd(3), RAND_bytes(3).
perl v5.26.1 2018-02-05 Random(3pm)
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Crypt::OpenSSL::Random(3pm) referred by Crypt::OpenSSL::RSA(3pm)
refer to perl(1) | rand(3) | RAND_add(3ssl) | RAND_bytes(3ssl) | RAND_egd(3ssl) | random(3)
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