Hello roperl,

Welcome to the monastery. I have never used the Crypt::OpenPGP but by reading the documentation why don't you the encrypted line one by one in the file and decrypt it?

Sample of code from similar question Crypt::OpenPGP, encrypting messages using a public key file:

$pgp = new Crypt::OpenPGP( SecRing => $private_file );
my $plaintext = $pgp->decrypt (
                               Data => $cyphertext,
                               Passphrase => $pass,
                              ) || die $pgp->errstr();
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Hope this helps, BR.