+#ifdef OPENSSL_NO_MD5
+#error MD5 is disabled.
+#endif
+
+/*
+ * !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+ * ! MD5_LONG has to be at least 32 bits wide. If it's wider, then !
+ * ! MD5_LONG_LOG2 has to be defined along. !
+ * !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+ */
+
+#if defined(OPENSSL_SYS_WIN16) || defined(__LP32__)
+#define MD5_LONG unsigned long
+#elif defined(OPENSSL_SYS_CRAY) || defined(__ILP64__)
+#define MD5_LONG unsigned long
+#define MD5_LONG_LOG2 3
+/*
+ * _CRAY note. I could declare short, but I have no idea what impact
+ * does it have on performance on none-T3E machines. I could declare
+ * int, but at least on C90 sizeof(int) can be chosen at compile time.
+ * So I've chosen long...
+ * <appro@fy.chalmers.se>
+ */
+#else
+#define MD5_LONG unsigned int
+#endif
+