3.1.5.2 Support for the HDAC-MD5 Algorithm

[RFC2845] section 2.2 specifies that TSIG MUST support the "HMAC-MD5" algorithm. GSS-API does not explicitly define the MAC formats supported. Instead it relies on the security support provider (SSP) that is exposed by the operating system. Implementations of this protocol extension MUST NOT support the "HMAC-MD5.SIG-ALG.REG.INT" algorithm in [RFC2845] section 7. Implementations of this protocol extension MUST support the "gss-tsig" algorithm, as specified in [RFC3645] section 3.1.2.