managed rijndael is broken in big endian

[NattyNarwhal]

see mcs/class/referencesource/mscorlib/system/security/cryptography/rijndaelmanagedtransform.cs, tried an endian swap in a few places and it moved the problem around. should find the lynchpins. I suspect this will get replaced with a CoreFX version anyways, and AFAIK, that relies on BTLS when possible instead...

[richardschoen]

Is this one of the things causing problems for file share authentication? If its replaced by a .net core version won't that limit it to .net core usage ?