Creates a keyed-hash MAC in hex-encoded format from hex-encoded input
public static string HexFromHex( string messageHex, string keyHex, MacAlgorithm macAlg )
Public Shared Function HexFromHex ( _ messageHex As String, _ keyHex As String, _ macAlg As MacAlgorithm _ ) As String
MAC in hex-encoded format
See Example1
VB6/C equivalent: MAC_HexFromHex