/* cfb.h

   Cipher feedback mode.

   Copyright (C) 2015, 2017 Dmitry Eremin-Solenikov

   Copyright (C) 2001 Niels Möller

   This file is part of GNU Nettle.

   GNU Nettle is free software: you can redistribute it and/or

   modify it under the terms of either:

     * the GNU Lesser General Public License as published by the Free

       Software Foundation; either version 3 of the License, or (at your

       option) any later version.

   or

     * the GNU General Public License as published by the Free

       Software Foundation; either version 2 of the License, or (at your

       option) any later version.

   or both in parallel, as here.

   GNU Nettle 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

   General Public License for more details.

   You should have received copies of the GNU General Public License and

   the GNU Lesser General Public License along with this program.  If

   not, see http://www.gnu.org/licenses/.

*/

#ifndef GNUTLS_LIB_NETTLE_BACKPORT_NETTLE_CFB_H_INCLUDED

#define GNUTLS_LIB_NETTLE_BACKPORT_NETTLE_CFB_H_INCLUDED

#include <nettle/nettle-types.h>

#include "block8.h"

#ifdef __cplusplus

extern "C" {

#endif

/* Name mangling */

#define cfb_encrypt gnutls_nettle_backport_cfb_encrypt

#define cfb_decrypt gnutls_nettle_backport_cfb_decrypt

#define cfb8_encrypt gnutls_nettle_backport_cfb8_encrypt

#define cfb8_decrypt gnutls_nettle_backport_cfb8_decrypt

void

cfb_encrypt(const void *ctx, nettle_cipher_func *f,

	    size_t block_size, uint8_t *iv,

	    size_t length, uint8_t *dst,

	    const uint8_t *src);

void

cfb_decrypt(const void *ctx, nettle_cipher_func *f,

	    size_t block_size, uint8_t *iv,

	    size_t length, uint8_t *dst,

	    const uint8_t *src);

void

cfb8_encrypt(const void *ctx, nettle_cipher_func *f,

	     size_t block_size, uint8_t *iv,

	     size_t length, uint8_t *dst,

	     const uint8_t *src);

void

cfb8_decrypt(const void *ctx, nettle_cipher_func *f,

	     size_t block_size, uint8_t *iv,

	     size_t length, uint8_t *dst,

	     const uint8_t *src);

#define CFB_CTX(type, size) \

{ type ctx; uint8_t iv[size]; }

#define CFB_SET_IV(ctx, data) \

memcpy((ctx)->iv, (data), sizeof((ctx)->iv))

#define CFB8_CTX CFB_CTX

#define CFB8_SET_IV CFB_SET_IV

/* NOTE: Avoid using NULL, as we don't include anything defining it. */

#define CFB_ENCRYPT(self, f, length, dst, src)		\

  (0 ? ((f)(&(self)->ctx, ~(size_t) 0,			\

	    (uint8_t *) 0, (const uint8_t *) 0))	\

   : cfb_encrypt((void *) &(self)->ctx,			\

		 (nettle_cipher_func *) (f),		\

		 sizeof((self)->iv), (self)->iv,	\

		 (length), (dst), (src)))

#define CFB_DECRYPT(self, f, length, dst, src)		\

  (0 ? ((f)(&(self)->ctx, ~(size_t) 0,			\

	    (uint8_t *) 0, (const uint8_t *) 0))	\

   : cfb_decrypt((void *) &(self)->ctx,			\

		 (nettle_cipher_func *) (f),		\

		 sizeof((self)->iv), (self)->iv,	\

		 (length), (dst), (src)))

#define CFB8_ENCRYPT(self, f, length, dst, src)		\

  (0 ? ((f)(&(self)->ctx, ~(size_t) 0,			\

	    (uint8_t *) 0, (const uint8_t *) 0))	\

   : cfb8_encrypt((void *) &(self)->ctx,		\

		  (nettle_cipher_func *) (f),		\

		  sizeof((self)->iv), (self)->iv,	\

		  (length), (dst), (src)))

#define CFB8_DECRYPT(self, f, length, dst, src)		\

  (0 ? ((f)(&(self)->ctx, ~(size_t) 0,			\

	    (uint8_t *) 0, (const uint8_t *) 0))	\

   : cfb8_decrypt((void *) &(self)->ctx,		\

		  (nettle_cipher_func *) (f),		\

		  sizeof((self)->iv), (self)->iv,	\

		  (length), (dst), (src)))

#ifdef __cplusplus

}

#endif

#endif /* GNUTLS_LIB_NETTLE_BACKPORT_NETTLE_CFB_H_INCLUDED */