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/*
* cifra - embedded cryptography library
* Written in 2014 by Joseph Birr-Pixton <jpixton@gmail.com>
*
* To the extent possible under law, the author(s) have dedicated all
* copyright and related and neighboring rights to this software to the
* public domain worldwide. This software is distributed without any
* warranty.
*
* You should have received a copy of the CC0 Public Domain Dedication
* along with this software. If not, see
* <http://creativecommons.org/publicdomain/zero/1.0/>.
*/
#ifndef PRP_H
#define PRP_H
#include <stddef.h>
#include <stdint.h>
/**
* General block cipher description
* ================================
* This allows us to implement block cipher modes which can work
* with different block ciphers.
*/
/* .. c:type:: cf_prp_block
* Block processing function type.
*
* The `in` and `out` blocks may alias.
*
* :rtype: void
* :param ctx: block cipher-specific context object.
* :param in: input block.
* :param out: output block.
*/
typedef void (*cf_prp_block)(void *ctx, const uint8_t *in, uint8_t *out);
/* .. c:type:: cf_prp
* Describes an PRP in a general way.
*
* .. c:member:: cf_prp.blocksz
* Block size in bytes. Must be no more than :c:macro:`CF_MAXBLOCK`.
*
* .. c:member:: cf_prp.encrypt
* Block encryption function.
*
* .. c:member:: cf_prp.decrypt
* Block decryption function.
*/
typedef struct
{
size_t blocksz;
cf_prp_block encrypt;
cf_prp_block decrypt;
} cf_prp;
/* .. c:macro:: CF_MAXBLOCK
* The maximum block cipher blocksize we support, in bytes.
*/
#define CF_MAXBLOCK 16
#endif
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