System.Security.Cryptography where is sha3?

Question

In the old days our standard for message authentication was to Xor MD5 and SHA, now that SHA3 has been out for quite a while now, I would like to Xor SHA2 and SHA3 to modernly follow the standard. However, Microsoft is far behind the times and has not released
SHA3 in their library.
The hashing is being used for secure message authentication over an encrypted connection which was already secured using RSA and/or ECDH, but the authentication codes are currently only SHA and MD5.
I understand there is a source at codeplex, but I would rather use Microsoft's library as it has already proven to have a good history. I am not so much an expert into this stuff, just know the basics, can I get some feedback into this?

Answer 1

HashAlgorithm.Create Method (String)
"The hash algorithm implementation to use. The following table shows the valid values for the
hashName parameter and the algorithms they map to."
SHA384Managed Class
SHA1 Class
SHA256 Class
SHA512 Class
SHA256CryptoServiceProvider Class
SHA384CryptoServiceProvider Class
SHA512CryptoServiceProvider Class
I don't know what you mean by Xor.
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