is_token_usable

Checks if the given token (OpenXPKI::Crypto::API) is usable by doing an encryption/decryption roundtrip.

Returns 1 if everything went fine, "undef" otherwise.

validity_to_epoch

Converts a HashRef with a validity interval given as DateTime objects into a HashRef with Unix epoch timestamps.

Expects undef or DateTime objects in a HashRef like this:

    {
        notbefore => DateTime->new(year => 1980, month => 12, day => 1),
        notafter => undef, # means: now
    }

and converts it to:

    {
        notbefore => 344476800,
        notafter => 1491328939,
    }