qcrypto-luks: extract check and parse header

This is just to make qcrypto_block_luks_open more
reasonable in size.

Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
1 file changed