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Can a 512-bit HMACSHA512 machine key in IIS be 256 characters long?

Why when generating the HMACSHA512 machine key in IIS on the 2012 server, the output of the verification key is 128 characters, but when I generate the same key using the Microsoft PowerShell function ( https://support.microsoft.com/en-us/kb/2915218# AppendixA ) Am I getting a 256-character key?

This article says that a 512-bit key must contain 128 characters, and a 256-bit key must be 64 characters long: https://msdn.microsoft.com/en-us/library/w8h3skw9(v=vs.100) .aspx

IIS gui generates keys that are 128 characters for the HMACSHA512 and HMACSHA256. How long have these keys been and are correct or the correct PowerShell function?

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