* mu-util: add mu_util_get_hash (refactored)

lib/mu-util.c

@@ -563,3 +563,27 @@ mu_util_read_password (const char *prompt)
 
 	return g_strdup (pass);
 }
+
+
+const char*
+mu_util_get_hash (const char* str)
+{
+	unsigned	djbhash, bkdrhash, bkdrseed;
+	unsigned	u;
+	static char	hex[18];
+
+	g_return_val_if_fail (str, NULL);
+
+	djbhash  = 5381;
+	bkdrhash = 0;
+	bkdrseed = 1313;
+
+	for(u = 0; str[u]; ++u) {
+		djbhash  = ((djbhash << 5) + djbhash) + str[u];
+		bkdrhash = bkdrhash * bkdrseed + str[u];
+	}
+
+	snprintf (hex, sizeof(hex), "%08x%08x", djbhash, bkdrhash);
+
+	return hex;
+}

lib/mu-util.h

@@ -502,6 +502,20 @@ gboolean mu_util_g_set_error (GError **err, MuError errcode, const char *frm, ..
 	G_GNUC_PRINTF(3,4);
 
 
+/**
+ * calculate a 64-bit hash for the given string, based on a
+ * combination of the DJB and BKDR hash functions
+ *
+ * @param a string
+ *
+ * @return the hash as a static string, which stays valid until this
+ * function is called again.
+ */
+const char* mu_util_get_hash (const char* str);
+
+
+
+
 #define MU_COLOR_RED		"\x1b[31m"
 #define MU_COLOR_GREEN		"\x1b[32m"
 #define MU_COLOR_YELLOW		"\x1b[33m"