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I just got to a point where I don't get errors anymore. Here's what I did.

First, I modified the way I create the Crypt::CBC object to:
my $cipher = Crypt::CBC->new(-key => $self->{SYMMKEY}, -cipher => 'Twofish', -salt => 1) or die "Unable to create cipher:\n$@\n";

My undertsanding is that CBC is now using a random Salt instead of a random IV. Correct me if I am wrong.

Doing that solved the decryption error I was getting. It was replaced by an EOCD error during the unzip operation.

I then followed your suggestion and replaced the getline with read:
# $fh_cipher->write($cipher->crypt($fh_plain->getline)) until ($fh_pla +in->eof); do { $fh_plain->read($buf, length($self->{SYMMKEY})); $fh_cipher->write($cipher->crypt($buf)) } until ($fh_plain->eof);
# $fh_plain->write($cipher->crypt($fh_cipher->getline)) until ($fh_cip +her->eof); do { $fh_cipher->read($buf, length($self->{SYMMKEY})); $fh_plain->write($cipher->crypt($buf)) } until ($fh_cipher->eof);
That got rid of the EOCD error. My app now runs as expected. Thanks for the tip!

In reply to Re^2: Crypt::CBC losing its RandomIV by Solostian
in thread Crypt::CBC losing its RandomIV by Solostian

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