/* -*-c-*-
*
- * $Id: des.h,v 1.2 1999/12/10 23:29:48 mdw Exp $
+ * $Id$
*
* The Data Encryption Standard
*
* MA 02111-1307, USA.
*/
-/*----- Revision history --------------------------------------------------*
- *
- * $Log: des.h,v $
- * Revision 1.2 1999/12/10 23:29:48 mdw
- * Change header file guard names.
- *
- * Revision 1.1 1999/09/03 08:41:11 mdw
- * Initial import.
- *
- */
-
/*----- Notes on the Data Encryption Standard -----------------------------*
*
* Almost twenty years after it was first accepted, DES is still the standard
#define DES_KEYSZ 7
#define DES_CLASS (N, B, 64)
+extern const octet des_keysz[];
+
/*----- Data structures ---------------------------------------------------*/
typedef struct des_ctx {
/*----- Functions provided ------------------------------------------------*/
+/* --- @des_expand@ --- *
+ *
+ * Arguments: @const octet *k@ = pointer to key material
+ * @size_t n@ = number of octets of key material (7 or 8)
+ * @uint32 *xx, *yy@ = where to put the results
+ *
+ * Returns: ---
+ *
+ * Use: Extracts 64 bits of key material from the given buffer,
+ * possibly expanding it from 56 to 64 bits on the way.
+ * Parity is set correctly if the key is expanded.
+ */
+
+extern void des_expand(const octet */*k*/, size_t /*n*/,
+ uint32 */*xx*/, uint32 */*yy*/);
+
/* --- @des_init@ --- *
*
* Arguments: @des_ctx *k@ = pointer to key block