NAME
Crypt::PRNG - Cryptographically secure random number generator
SYNOPSIS
### Functional interface:
use Crypt::PRNG qw(random_bytes random_bytes_hex random_bytes_b64 random_bytes_b64u
random_string random_string_from rand irand);
$octets = random_bytes(45);
$hex_string = random_bytes_hex(45);
$base64_string = random_bytes_b64(45);
$base64url_string = random_bytes_b64u(45);
$alphanumeric_string = random_string(30);
$string = random_string_from('ACGT', 64);
$floating_point_number_0_to_1 = rand;
$floating_point_number_0_to_88 = rand(88);
$unsigned_32bit_int = irand;
### OO interface:
use Crypt::PRNG;
$prng = Crypt::PRNG->new;
#or
$prng = Crypt::PRNG->new("RC4");
#or
$prng = Crypt::PRNG->new("RC4", "some data used for seeding PRNG");
$octets = $prng->bytes(45);
$hex_string = $prng->bytes_hex(45);
$base64_string = $prng->bytes_b64(45);
$base64url_string = $prng->bytes_b64u(45);
$alphanumeric_string = $prng->string(30);
$string = $prng->string_from('ACGT', 64);
$floating_point_number_0_to_1 = $prng->double;
$floating_point_number_0_to_88 = $prng->double(88);
$unsigned_32bit_int = $prng->int32;DESCRIPTION
Provides an interface to the ChaCha20 based pseudo random number generator (thread-safe and fork-safe).
FUNCTIONS
random_bytes
$octets = random_bytes($length);Returns $length random octects.
random_bytes_hex
$hex_string = random_bytes_hex($length);Returns $length random octects encoded as hexadecimal string.
random_bytes_b64
$base64_string = random_bytes_b64($length);Returns $length random octects Base64 encoded.
random_bytes_b64u
$base64url_string = random_bytes_b64u($length);Returns $length random octects Base64 URL Safe (RFC 4648 section 5) encoded.
random_string_from
$string = random_string_from($range, $length);
#e.g.
$string = random_string_from("ABCD", 10);Returns a random string made of $length chars randomly chosen from $range string.
random_string
$alphanumeric_string = random_string($length);
#or
$alphanumeric_string = random_string; # default length = 20Similar to random_string_from, only $range is fixed to 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789'.
rand
$n = rand;
#or
$n = rand($limit);Returns a random floating point number from range [0,1) (if called without parameter) or [0,$limit).
irand
$i = irand;Returns a random unsigned 32bit integer - range 0 .. 0xFFFFFFFF.
METHODS
new
$prng = Crypt::PRNG->new;
#or
$prng = Crypt::PRNG->new($alg);
#or
$prng = Crypt::PRNG->new($alg, $seed);
# $alg ... algorithm name 'Frotuna' (DEFAULT), 'RC4', 'Sober128' or 'Yarrow'
# $seed ... will be used as an initial entropy for seeding PRNGIf $seed is not specified the PRNG is automatically seeded with 32bytes random data taken from /dev/random (UNIX) or CryptGenRandom (Win32)
add_entropy
$prng->add_entropy($random_data);
#or
$prng->add_entropy();If called without parameter it uses 32bytes random data taken from /dev/random (UNIX) or CryptGenRandom (Win32).
BEWARE: you probably do not need this function at all as the module does automatic seeding on initialization as well as reseeding after fork and thread creation.
bytes
$octets = $prng->bytes($length);See random_bytes
bytes_hex
$hex_string = $prng->bytes_hex($length);See random_bytes_hex
bytes_b64
$base64_string = $prng->bytes_b64($length);See random_bytes_b64
bytes_b64u
$base64url_string = $prng->bytes_b64u($length);string
$alphanumeric_string = $prng->string($length);
#or
$alphanumeric_string = $prng->string;See random_string
string_from
$string = $prng->string_from($range, $length);double
$n = $prng->double;
#or
$n = $prng->double($limit);See rand
int32
$i = $prng->int32;See irand
SEE ALSO
Crypt::PRNG::Fortuna, Crypt::PRNG::RC4, Crypt::PRNG::Sober128, Crypt::PRNG::Yarrow