+#ifdef IS_UNKNOWN
+#define MD5_F(x,y,z) ((z) ^ ((x) & ((y) ^ (z))))
+#define MD5_G(x,y,z) ((y) ^ ((z) & ((x) ^ (y))))
+#define MD5_H(x,y,z) ((x) ^ (y) ^ (z))
+#define MD5_H1(x,y,z) ((tmp2 = (x) ^ (y)) ^ (z))
+#define MD5_H2(x,y,z) ((x) ^ tmp2)
+#define MD5_I(x,y,z) ((y) ^ ((x) | ~(z)))
+#define MD5_Fo(x,y,z) (MD5_F((x), (y), (z)))
+#define MD5_Go(x,y,z) (MD5_G((x), (y), (z)))
+#endif
+