+++ /dev/null
-/* -*-c-*-
- *
- * $Id: cfb.h,v 1.5 2004/04/08 01:36:15 mdw Exp $
- *
- * Ciphertext feedback for block ciphers
- *
- * (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.
- */
-
-#ifndef CATACOMB_CFB_H
-#define CATACOMB_CFB_H
-
-#ifdef __cplusplus
- extern "C" {
-#endif
-
-/*----- Header files ------------------------------------------------------*/
-
-#include <stddef.h>
-
-#include <mLib/bits.h>
-
-#ifndef CATACOMB_GCIPHER_H
-# include "gcipher.h"
-#endif
-
-/*----- Data structures ---------------------------------------------------*/
-
-/* --- @CFB_DECL@ --- *
- *
- * Arguments: @PRE@, @pre@ = prefixes for the underlying block cipher
- *
- * Use: Creates declarations for CFB mode.
- */
-
-#define CFB_DECL(PRE, pre) \
- \
-/* --- Ciphertext feedback context --- */ \
- \
-typedef struct pre##_cfbctx { \
- pre##_ctx ctx; /* Underlying cipher context */ \
- unsigned off; /* Offset into @iv@ buffer */ \
- octet iv[PRE##_BLKSZ]; /* Previous ciphertext or IV */ \
-} pre##_cfbctx; \
- \
-/* --- @pre_cfbgetiv@ --- * \
- * \
- * Arguments: @const pre_cfbctx *ctx@ = pointer to CFB context block \
- * @void *iv@ = pointer to output data block \
- * \
- * Returns: --- \
- * \
- * Use: Reads the currently set IV. Reading and setting an IV \
- * is not transparent to the cipher. It will add a `step' \
- * which must be matched by a similar operation during \
- * decryption. \
- */ \
- \
-extern void pre##_cfbgetiv(const pre##_cfbctx */*ctx*/, \
- void */*iv*/); \
- \
-/* --- @pre_cfbsetiv@ --- * \
- * \
- * Arguments: @pre_cfbctx *ctx@ = pointer to CFB context block \
- * @cnost void *iv@ = pointer to IV to set \
- * \
- * Returns: --- \
- * \
- * Use: Sets the IV to use for subsequent encryption. \
- */ \
- \
-extern void pre##_cfbsetiv(pre##_cfbctx */*ctx*/, \
- const void */*iv*/); \
- \
-/* --- @pre_cfbbdry@ --- * \
- * \
- * Arguments: @pre_cfbctx *ctx@ = pointer to CFB context block \
- * \
- * Returns: --- \
- * \
- * Use: Inserts a boundary during encryption. Successful \
- * decryption must place a similar boundary. \
- */ \
- \
-extern void pre##_cfbbdry(pre##_cfbctx */*ctx*/); \
- \
-/* --- @pre_cfbsetkey@ --- * \
- * \
- * Arguments: @pre_cfbctx *ctx@ = pointer to CFB context block \
- * @const pre_ctx *k@ = pointer to cipher context \
- * \
- * Returns: --- \
- * \
- * Use: Sets the CFB context to use a different cipher key. \
- */ \
- \
-extern void pre##_cfbsetkey(pre##_cfbctx */*ctx*/, \
- const pre##_ctx */*k*/); \
- \
-/* --- @pre_cfbinit@ --- * \
- * \
- * Arguments: @pre_cfbctx *ctx@ = pointer to cipher context \
- * @const void *key@ = pointer to the key buffer \
- * @size_t sz@ = size of the key \
- * @const void *iv@ = pointer to initialization vector \
- * \
- * Returns: --- \
- * \
- * Use: Initializes a CFB context ready for use. You should \
- * ensure that the IV chosen is unique: reusing an IV will \
- * compromise the security of at least the first block \
- * encrypted. This is equivalent to calls to @pre_init@, \
- * @pre_cfbsetkey@ and @pre_cfbsetiv@. \
- */ \
- \
-extern void pre##_cfbinit(pre##_cfbctx */*ctx*/, \
- const void */*key*/, size_t /*sz*/, \
- const void */*iv*/); \
- \
-/* --- @pre_cfbencrypt@ --- * \
- * \
- * Arguments: @pre_cfbctx *ctx@ = pointer to CFB context block \
- * @const void *src@ = pointer to source data \
- * @void *dest@ = pointer to destination data \
- * @size_t sz@ = size of block to be encrypted \
- * \
- * Returns: --- \
- * \
- * Use: Encrypts a block with a block cipher in CFB mode. The \
- * input block may be arbitrary in size. CFB mode is not \
- * sensitive to block boundaries. \
- */ \
- \
-extern void pre##_cfbencrypt(pre##_cfbctx */*ctx*/, \
- const void */*src*/, void */*dest*/, \
- size_t /*sz*/); \
- \
-/* --- @pre_cfbencrypt@ --- * \
- * \
- * Arguments: @pre_cfbctx *ctx@ = pointer to CFB context block \
- * @const void *src@ = pointer to source data \
- * @void *dest@ = pointer to destination data \
- * @size_t sz@ = size of block to be encrypted \
- * \
- * Returns: --- \
- * \
- * Use: Decrypts a block with a block cipher in CFB mode. The \
- * input block may be arbitrary in size. CFB mode is not \
- * sensitive to block boundaries. \
- */ \
- \
-extern void pre##_cfbdecrypt(pre##_cfbctx */*ctx*/, \
- const void */*src*/, void */*dest*/, \
- size_t /*sz*/); \
- \
-/* --- Generic cipher interface --- */ \
- \
-extern const gccipher pre##_cfb;
-
-/*----- That's all, folks -------------------------------------------------*/
-
-#ifdef __cplusplus
- }
-#endif
-
-#endif
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