Implement support for cloud DPAPI

[aspnet-hello]

From @GrabYourPitchforks on Thursday, October 9, 2014 6:19:27 PM

Currently Antares and most other hosting providers store machine keys in plain text in applicationHost.config. We store our keys in %HOME%, but still in plain text. We can't use DPAPI because it's not meant for scale-our scenarios such as these. We need to convince Antares and other hosters to make a CryptProtectData-like API for our consumption. One possible implementation would be for us to read a DLL path from the system registry, then to look for a CryptProtectData-like export from that module.

Copied from original issue: aspnet/DataProtection#22

[mkArtakMSFT]

Hi. Thanks for contacting us.
We're closing this issue as there was not much community interest in this ask for quite a while now.
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