[Mono-dev] [PATCH] SecureString implementation

[Sebastien Pouliot]

Hello,

This patch almost complete the SecureString implementation. The missing
pieces are:
- the new Marshal.SecureStringTo... methods; and
- that, AFAIK, the runtime doesn't support CriticalFinalizerObject

SecureString is implemented on top of ProtectedMemory. On Windows Data
Protection API (DPAPI) is used to implement ProtectedMemory while on Linux
(and other platforms) I added AES support into the runtime (so we get
partial ProtectedMemory support).

The AES implementation used (too large to be part of the patch) can be found
at:
http://www.mirrors.wiretapped.net/security/cryptography/algorithms/aes/aes-c-rijmen/

P.S. Support for some of the new Marshal methods will be added later.

Sebastien
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