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# $fh_cipher->write($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);