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[u/mdw/catacomb] / des.h

diff --git a/des.h b/des.h
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-/* -*-c-*-
- *
- * $Id$
- *
- * The Data Encryption Standard
- *
- * (c) 1999 Straylight/Edgeware
- */
-
-/*----- Licensing notice --------------------------------------------------*
- *
- * This file is part of Catacomb.
- *
- * Catacomb is free software; you can redistribute it and/or modify
- * it under the terms of the GNU Library General Public License as
- * published by the Free Software Foundation; either version 2 of the
- * License, or (at your option) any later version.
- *
- * Catacomb is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU Library General Public License for more details.
- *
- * You should have received a copy of the GNU Library General Public
- * License along with Catacomb; if not, write to the Free
- * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
- * MA 02111-1307, USA.
- */
-
-/*----- Notes on the Data Encryption Standard -----------------------------*
- *
- * Almost twenty years after it was first accepted, DES is still the standard
- * block cipher.  It's showing its age in its small key size and poor
- * optimiziation for software implementations, but it's not really been badly
- * dented by the intensive analysis thrown at it.
- *
- * This interface is here for compatibility with existing protocols, and
- * because it's a trivial veneer over the base DES code which is used by the
- * @des3@ interface which implements proper strong triple-DES.
- */
-
-#ifndef CATACOMB_DES_H
-#define CATACOMB_DES_H
-
-#ifdef __cplusplus
-  extern "C" {
-#endif
-
-/*----- Header files ------------------------------------------------------*/
-
-#include <stddef.h>
-
-#include <mLib/bits.h>
-
-/*----- Magical numbers ---------------------------------------------------*/
-
-#define DES_BLKSZ 8
-#define DES_KEYSZ 7
-#define DES_CLASS (N, B, 64)
-
-extern const octet des_keysz[];
-
-/*----- Data structures ---------------------------------------------------*/
-
-typedef struct des_ctx {
-  uint32 k[32];
-} 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
- *             @const void *buf@ = pointer to key buffer
- *             @size_t sz@ = size of key material
- *
- * Returns:    ---
- *
- * Use:                Initializes a DES key buffer.  The key buffer may be either 7
- *             or 8 bytes long.  If it's 8 bytes, the key is assumed to be
- *             padded with parity bits in the low order bit of each octet.
- *             These are stripped out without checking prior to the actual
- *             key scheduling.
- */
-
-extern void des_init(des_ctx */*k*/, const void */*buf*/, size_t /*sz*/);
-
-/* --- @des_eblk@, @des_dblk@ --- *
- *
- * Arguments:  @const des_ctx *k@ = pointer to key block
- *             @const uint32 s[2]@ = pointer to source block
- *             @uint32 d[2]@ = pointer to destination block
- *
- * Returns:    ---
- *
- * Use:                Low-level block encryption and decryption.
- */
-
-extern void des_eblk(const des_ctx */*k*/,
-                    const uint32 */*s*/, uint32 */*d*/);
-extern void des_dblk(const des_ctx */*k*/,
-                    const uint32 */*s*/, uint32 */*d*/);
-
-/*----- That's all, folks -------------------------------------------------*/
-
-#ifdef __cplusplus
-  }
-#endif
-
-#endif