encrypt() seems to NUL pad the string to the required block size:
$plaintext .= "\0" x $trail;
That's where your NULs are coming from. If you know that trailing \0s are not ever valid, you can strip them right before your return in decrypt():
$plaintext =~ s/\0+$//;
On the other hand, if trailing NUL are a legitimate possibility, you will have to come up with a different plan, such as encoding the real length within your plaintext in encrypt() so you can trim it in the decrypt() sub.
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