The CMS.BtoA() and CMS.AtoB() have a dependency on CMSEngine which makes it unusable by clients. These methods call the some other methods in CMSEngine which eventually call base64encode() and base64decode() in Utils. It's actually possible to call the Utils method directly and get the same results.

It's not clear whether the indirection via CMSEngine is necessary. One possibility is to allow custom engine to use different encoding, but the problem is it might not match the client's encoding.

One solution is to change all code that calls CMS.BtoA() and CMS.AtoB() to call the Utils methods directly, and remove/deprecate the BtoA() and AtoB() in CMS and CMSEngine.