UI: Add obfuscation func

You could also say..  obs-fuscation.

UI/obf.c

@@ -0,0 +1,27 @@
+#include "obf.h"
+#include <stdbool.h>
+
+#define LOWER_HALFBYTE(x) ((x) & 0xF)
+#define UPPER_HALFBYTE(x) (((x) >> 4) & 0xF)
+
+void deobfuscate_str(char *str, uint64_t val)
+{
+	uint8_t *dec_val = (uint8_t*)&val;
+	int i = 0;
+
+	while (*str != 0) {
+		int pos = i / 2;
+		bool bottom = (i % 2) == 0;
+		uint8_t *ch = (uint8_t*)str;
+		uint8_t xor = bottom ?
+			LOWER_HALFBYTE(dec_val[pos]) :
+			UPPER_HALFBYTE(dec_val[pos]);
+
+		*ch ^= xor;
+
+		if (++i == sizeof(uint64_t) * 2)
+			i = 0;
+
+		str++;
+	}
+}