New Configure option no-<cipher> (rsa, idea, rc5, ...).
diff --git a/apps/rsa.c b/apps/rsa.c
index 1372a5f..3be1f67 100644
--- a/apps/rsa.c
+++ b/apps/rsa.c
@@ -56,6 +56,7 @@
  * [including the GNU Public Licence.]
  */
 
+#ifndef NO_RSA
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -298,4 +299,4 @@
 	if (rsa != NULL) RSA_free(rsa);
 	EXIT(ret);
 	}
-
+#endif