I have tried to find a CDN provider which would offer access control similar to Cloudfront's signed cookies but failed to find something that would match it.
This is a major drawback with these providers offering S3 style bucket storage because most of time you would want to serve the content from a CDN and offloading access control to CDN via cookies makes life so much easier. You only need to set the cookies for the user's session once and they are automatically sent (by the web browser) to the CDN with no additional work needed