I had the same issue. When the user and password are hard coded it works fine, if the values are pulled in from a configuration object it fails:
'input must be 8 bytes long at ...'
This became a problem only after I switched from using a csv config file (that was parsed directly by the script) to an xml config file (that is parsed by a configuration module using XML::Parser).
Now I cannot tell you why this works, and I would love it for someone to explain, but it does. I think for some reason the data cannot be padded correctly for Crypt::DES before this transformation.
my $pass = $user_data->{password};
my $user = $user_data->{user};
my @pass = split '', $pass;
my @user = split '', $user;
$user = join '', @user;
$pass = join '', @pass;
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