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: NPhilippe Mathieu-Daudé <philmd@redhat.com> Reviewed-by: NStefano Garzarella <sgarzare@redhat.com> Signed-off-by: NDaniel P. Berrangé <berrange@redhat.com>
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