| /* |
| * 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 |
