I ran into this when we updated to CentOS 7.2 and went from perl 5.10 to 5.16. $p is too big for perl to subtract 1 from and results in inf. Still trying to figure out why it worked before but for now using Math::BigInt to calculate p_minus1 will fix it:
sub gen_k {
my ($p) = @_;
## XXX choose bitsize based on bitsize of $p
my $bits = 198;
my $p_minus1 = Math::BigInt->new($p)->bsub(1);
my $k = Crypt::OpenPGP::Util::get_random_bigint($bits);
while (1) {
last if Math::BigInt::bgcd($k, $p_minus1) == 1;
$k++;
}
$k;
}
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