libcryptx-perl/lib/Crypt/PRNG.pm
2018-03-22 15:54:03 +01:00

261 lines
6.5 KiB
Perl

package Crypt::PRNG;
use strict;
use warnings;
our $VERSION = '0.058_002';
require Exporter; our @ISA = qw(Exporter); ### use Exporter 'import';
our %EXPORT_TAGS = ( all => [qw(random_bytes random_bytes_hex random_bytes_b64 random_bytes_b64u random_string random_string_from rand irand)] );
our @EXPORT_OK = ( @{ $EXPORT_TAGS{'all'} } );
our @EXPORT = qw();
use Carp;
$Carp::Internal{(__PACKAGE__)}++;
use CryptX;
sub string {
my ($self, $len) = @_;
return $self->string_from("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789", $len);
}
sub string_from {
my ($self, $chars, $len) = @_;
$len = 20 unless defined $len;
return unless $len > 0;
return unless length($chars) > 0;
my @ch = split(//, $chars);
my $max_index = $#ch;
return if $max_index > 65535;
my $mask;
for my $n (1..31) {
$mask = (1<<$n) - 1;
last if $mask >= $max_index;
}
my $upck = ($max_index > 255) ? "n*" : "C*";
my $l = $len * 2;
my $rv = '';
my @r;
while (length $rv < $len) {
@r = unpack($upck, $self->bytes($l)) if scalar @r == 0;
my $i = (shift @r) & $mask;
next if $i > $max_index;
$rv .= $ch[$i];
}
return $rv;
}
sub CLONE_SKIP { 1 } # prevent cloning
### FUNCTIONS
{
### stolen from Bytes::Random::Secure
#
# Instantiate our random number generator(s) inside of a lexical closure,
# limiting the scope of the RNG object so it can't be tampered with.
my $RNG_object = undef;
my $fetch_RNG = sub { # Lazily, instantiate the RNG object, but only once.
$RNG_object = Crypt::PRNG->new unless defined $RNG_object && ref($RNG_object) ne 'SCALAR';
return $RNG_object;
};
sub rand(;$) { return $fetch_RNG->()->double(@_) }
sub irand() { return $fetch_RNG->()->int32() }
sub random_bytes($) { return $fetch_RNG->()->bytes(@_) }
sub random_bytes_hex($) { return $fetch_RNG->()->bytes_hex(@_) }
sub random_bytes_b64($) { return $fetch_RNG->()->bytes_b64(@_) }
sub random_bytes_b64u($) { return $fetch_RNG->()->bytes_b64u(@_) }
sub random_string_from($;$) { return $fetch_RNG->()->string_from(@_) }
sub random_string(;$) { return $fetch_RNG->()->string(@_) }
}
1;
=pod
=head1 NAME
Crypt::PRNG - Cryptographically secure random number generator
=head1 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;
=head1 DESCRIPTION
Provides an interface to the ChaCha20 based pseudo random number generator (thread-safe and fork-safe).
=head1 FUNCTIONS
=head2 random_bytes
$octets = random_bytes($length);
Returns C<$length> random octects.
=head2 random_bytes_hex
$hex_string = random_bytes_hex($length);
Returns C<$length> random octects encoded as hexadecimal string.
=head2 random_bytes_b64
$base64_string = random_bytes_b64($length);
Returns C<$length> random octects Base64 encoded.
=head2 random_bytes_b64u
$base64url_string = random_bytes_b64u($length);
Returns C<$length> random octects Base64 URL Safe (RFC 4648 section 5) encoded.
=head2 random_string_from
$string = random_string_from($range, $length);
#e.g.
$string = random_string_from("ABCD", 10);
Returns a random string made of C<$length> chars randomly chosen from C<$range> string.
=head2 random_string
$alphanumeric_string = random_string($length);
#or
$alphanumeric_string = random_string; # default length = 20
Similar to random_string_from, only C<$range> is fixed to C<'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789'>.
=head2 rand
$n = rand;
#or
$n = rand($limit);
Returns a random floating point number from range C<[0,1)> (if called without parameter) or C<[0,$limit)>.
=head2 irand
$i = irand;
Returns a random unsigned 32bit integer - range C<0 .. 0xFFFFFFFF>.
=head1 METHODS
=head2 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'
# $seed ... will be used as an initial entropy for seeding PRNG
If C<$seed> is not specified the PRNG is automatically seeded with 32bytes random data taken from C</dev/random> (UNIX) or C<CryptGenRandom> (Win32)
=head2 add_entropy
$prng->add_entropy($random_data);
#or
$prng->add_entropy();
If called without parameter it uses 32bytes random data taken from C</dev/random> (UNIX) or C<CryptGenRandom> (Win32).
B<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.
=head2 bytes
$octets = $prng->bytes($length);
See L<random_bytes|/random_bytes>
=head2 bytes_hex
$hex_string = $prng->bytes_hex($length);
See L<random_bytes_hex|/random_bytes_hex>
=head2 bytes_b64
$base64_string = $prng->bytes_b64($length);
See L<random_bytes_b64|/random_bytes_b64>
=head2 bytes_b64u
$base64url_string = $prng->bytes_b64u($length);
See L<random_bytes_b64u|/random_bytes_b64u>
=head2 string
$alphanumeric_string = $prng->string($length);
#or
$alphanumeric_string = $prng->string;
See L<random_string|/random_string>
=head2 string_from
$string = $prng->string_from($range, $length);
See L<random_string_from|/random_string_from>
=head2 double
$n = $prng->double;
#or
$n = $prng->double($limit);
See L<rand|/rand>
=head2 int32
$i = $prng->int32;
See L<irand|/irand>
=head1 SEE ALSO
L<Crypt::PRNG::Fortuna>, L<Crypt::PRNG::RC4>, L<Crypt::PRNG::Sober128>, L<Crypt::PRNG::Yarrow>
=cut