+ * Revision 1.4 2000/10/15 19:09:20 mdw
+ * Support HMAC mode for hash functions which need to store more state than
+ * the hash output size.
+ *
+ * Revision 1.3 2000/06/17 11:32:52 mdw
+ * Change buffer offset to be unsigned.
+ *
+ * Revision 1.2 1999/12/10 23:20:03 mdw
+ * New hash interface requirements.
+ *