according to Mark Crispin <MRC@Panda.COM>.
[Bodo Moeller]
+#if 0
*) DES CBC did not update the IV. Weird.
[Ben Laurie]
+#else
+ des_cbc_encrypt does not update the IV, but des_ncbc_encrypt does.
+ Changing the behaviour of the former might break existing programs --
+ where IV updating is needed, des_ncbc_encrypt can be used.
+#endif
*) When bntest is run from "make test" it drives bc to check its
calculations, as well as internally checking them. If an internal check