bn_prime.pl
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#! /usr/bin/env perl
# Copyright 1998-2018 The OpenSSL Project Authors. All Rights Reserved.
#
# Licensed under the OpenSSL license (the "License"). You may not use
# this file except in compliance with the License. You can obtain a copy
# in the file LICENSE in the source distribution or at
# https://www.openssl.org/source/license.html
# Output year depends on the year of the script.
my $YEAR = [localtime([stat($0)]->[9])]->[5] + 1900;
print <<"EOF";
/*
* WARNING: do not edit!
* Generated by crypto/bn/bn_prime.pl
*
* Copyright 1998-$YEAR The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the OpenSSL license (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
EOF
my $num = shift || 2048;
my @primes = ( 2 );
my $p = 1;
loop: while ($#primes < $num-1) {
$p += 2;
my $s = int(sqrt($p));
for (my $i = 0; defined($primes[$i]) && $primes[$i] <= $s; $i++) {
next loop if ($p % $primes[$i]) == 0;
}
push(@primes, $p);
}
print "typedef unsigned short prime_t;\n";
printf "# define NUMPRIMES %d\n\n", $num;
printf "static const prime_t primes[%d] = {", $num;
for (my $i = 0; $i <= $#primes; $i++) {
printf "\n " if ($i % 8) == 0;
printf " %5d,", $primes[$i];
}
print "\n};\n";