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H A Dconfiguredc2207af2de162005f7e9e534850d07232290cee Mon Oct 14 11:28:27 CDT 2019 Daniel P. Berrangé <berrange@redhat.com> crypto: add support for nettle's native XTS impl

Nettle 3.5.0 will add support for the XTS mode. Use this because long
term we wish to delete QEMU's XTS impl to avoid carrying private crypto
algorithm impls.

Unfortunately this degrades nettle performance from 612 MB/s to 568 MB/s
as nettle's XTS impl isn't so well optimized yet.

Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>