Create a keyed-hash HMAC in hex-encoded format from hex-encoded input.
public static string HexFromHex( string messageHex, string keyHex, HashAlgorithm hashAlg )
Public Shared Function HexFromHex ( _ messageHex As String, _ keyHex As String, _ hashAlg As HashAlgorithm _ ) As String
VB6/C equivalent: HMAC_HexFromHex