VB to ANDROID java convertion

I want to convert a vb function to Android java and I want results as same as VB only . below is the function. Function GetChallengeResponse(ChByt0 As String, ChByt1 As String, ChByt2 As String, ChByt3 As String) As String Dim num1 As Long Dim num2 As Long Dim arg1 As Byte Dim arg2 As Byte Dim arg3 As Byte Dim arg4 As Byte arg1 = CByte("&H" & ChByt0) arg2 = CByte("&H" & ChByt1) arg3 = CByte("&H" & ChByt2) arg4 = CByte("&H" & ChByt3) (((F3+06+50) ^ F3)+41) * 16 num2 = (((arg4 + arg3 + arg1) Xor arg4) + arg2) * 16 If num2 >= 256 Then num2 = CLng("&H" & Mid(StrReverse(Hex(num2)), 1, 3)) End If num1 = (((arg4 + arg3 + arg2) Xor arg3) + arg1) * 16 If num1 >= 256 Then num1 = CLng("&H" & Mid(StrReverse(Hex(num1)), 1, 3)) End If GetChallengeResponse = CStr(num1) & " " & CStr(num2) End Function