/* -*-c-*-
*
- * $Id: twofish.h,v 1.1 2000/06/17 12:10:17 mdw Exp $
+ * $Id: twofish.h,v 1.5 2004/04/08 01:36:15 mdw Exp $
*
* The Twofish block cipher
*
* MA 02111-1307, USA.
*/
-/*----- Revision history --------------------------------------------------*
- *
- * $Log: twofish.h,v $
- * Revision 1.1 2000/06/17 12:10:17 mdw
- * New cipher.
- *
- */
-
/*----- Notes on the Twofish block cipher ---------------------------------*
*
* Twofish was designed by Bruce Schneier, John Kelsey, Doug Whiting, David
* Wagner, Chris Hall and Niels Ferguson. The algorithm is unpatented and
- * free for anyone to use. It is one of the five AES finalist algorithms.
- * At the time of writing, the AES competition is still underway.
+ * free for anyone to use. It was one of the five AES finalist algorithms.
*
* Twofish is a complex cipher offering various space and time tradeoffs.
* This implementation has a heavy key schedule and fast bulk encryption.
uint32 g[4][256];
} twofish_ctx;
+typedef struct twofish_fk {
+ uint32 t0[8], t23[8], t4[2];
+ octet t1[32];
+} twofish_fk;
+
/*----- Functions provided ------------------------------------------------*/
+/* --- @twofish_initfk@ --- *
+ *
+ * Arguments: @twofish_ctx *k@ = pointer to key block to fill in
+ * @const void *buf@ = pointer to buffer of key material
+ * @size_t sz@ = size of key material
+ * @const twofish_fk *fk@ = family-key information
+ *
+ * Returns: ---
+ *
+ * Use: Does the underlying Twofish key initialization with family
+ * key. Pass in a family-key structure initialized to
+ * all-bits-zero for a standard key schedule.
+ */
+
+extern void twofish_initfk(twofish_ctx */*k*/, const void */*buf*/,
+ size_t /*sz*/, const twofish_fk */*fk*/);
+
/* --- @twofish_init@ --- *
*
* Arguments: @twofish_ctx *k@ = pointer to key block to fill in
extern void twofish_init(twofish_ctx */*k*/,
const void */*buf*/, size_t /*sz*/);
+/* --- @twofish_fkinit@ --- *
+ *
+ * Arguments: @twofish_fk *fk@ = pointer to family key block
+ * @const void *buf@ = pointer to buffer of key material
+ * @size_t sz@ = size of key material
+ *
+ * Returns: ---
+ *
+ * Use: Initializes a family-key buffer. This implementation allows
+ * family keys of any size acceptable to the Twofish algorithm.
+ */
+
+extern void twofish_fkinit(twofish_fk */*fk*/,
+ const void */*buf*/, size_t /*sz*/);
+
/* --- @twofish_eblk@, @twofish_dblk@ --- *
*
* Arguments: @const twofish_ctx *k@ = pointer to key block
const uint32 */*s*/, uint32 */*d*/);
extern void twofish_dblk(const twofish_ctx */*k*/,
- const uint32 */*s*/, uint32 */*d*/);
+ const uint32 */*s*/, uint32 */*d*/);
/*----- That's all, folks -------------------------------------------------*/