[xmlsec] Verify signature after certificate expired

[Roman Bouchner]

Hello
I would like to verify signed data however signer's certificate has
already expired. I want only verify data integrity.
If I use function xmlSecDSigValidate, it returns negative value, so I
cannot determine if data was changed or not.
If I change local date it does work, however it is not right way I
think..
How I can solve this problems?
Thanks:)
Roman Bouchner