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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/>.
- */
-
-/**
- * The AES block cipher
- * ====================
- *
- * This is a small, simple implementation of AES. Key expansion is done
- * first, filling in a :c:type:`cf_aes_context`. Then encryption and
- * decryption can be performed as desired.
- *
- * Usually you don't want to use AES directly; you should use it via
- * a :doc:`block cipher mode <modes>`.
- */
-
-#ifndef AES_H
-#define AES_H
-
-#include <stddef.h>
-#include <stdint.h>
-
-#include "prp.h"
-
-/* .. c:macro:: AES_BLOCKSZ
- * AES has a 128-bit block size. This quantity is in bytes.
- */
-#define AES_BLOCKSZ 16
-
-/* --- Size configuration --- */
-
-/* .. c:macro:: AES128_ROUNDS
- * .. c:macro:: AES192_ROUNDS
- * .. c:macro:: AES256_ROUNDS
- *
- * Round counts for different key sizes.
- */
-#define AES128_ROUNDS 10
-#define AES192_ROUNDS 12
-#define AES256_ROUNDS 14
-
-/* .. c:macro:: CF_AES_MAXROUNDS
- *
- * You can reduce the maximum number of rounds this implementation
- * supports. This reduces the storage needed by :c:type:`cf_aes_context`.
- *
- * The default is :c:macro:`AES256_ROUNDS` and is good for all key
- * sizes.
- */
-#ifndef CF_AES_MAXROUNDS
-# define CF_AES_MAXROUNDS AES256_ROUNDS
-#endif
-
-/* .. c:macro:: CF_AES_ENCRYPT_ONLY
- *
- * Define this to 1 if you don't need to decrypt anything.
- * This saves space. :c:func:`cf_aes_decrypt` calls `abort(3)`.
- */
-#ifndef CF_AES_ENCRYPT_ONLY
-# define CF_AES_ENCRYPT_ONLY 0
-#endif
-
-/* .. c:type:: cf_aes_context
- * This type represents an expanded AES key. Create one
- * using :c:func:`cf_aes_init`, make use of one using
- * :c:func:`cf_aes_encrypt` or :c:func:`cf_aes_decrypt`.
- *
- * The contents of this structure are equivalent to the
- * original key material. You should clean the
- * contents of this structure with :c:func:`cf_aes_finish`
- * when you're done.
- *
- * .. c:member:: cf_aes_context.rounds
- *
- * Number of rounds to use, set by :c:func:`cf_aes_init`.
- *
- * This depends on the original key size, and will be
- * :c:macro:`AES128_ROUNDS`, :c:macro:`AES192_ROUNDS` or
- * :c:macro:`AES256_ROUNDS`.
- *
- * .. c:member:: cf_aes_context.ks
- *
- * Expanded key material. Filled in by :c:func:`cf_aes_init`.
- */
-typedef struct
-{
- uint32_t rounds;
- uint32_t ks[AES_BLOCKSZ / 4 * (CF_AES_MAXROUNDS + 1)];
-} cf_aes_context;
-
-/* .. c:function:: $DECL
- * This function does AES key expansion. It destroys
- * existing contents of :c:data:`ctx`.
- *
- * :param ctx: expanded key context, filled in by this function.
- * :param key: pointer to key material, of :c:data:`nkey` bytes.
- * :param nkey: length of key material. Must be `16`, `24` or `32`.
- */
-extern void cf_aes_init(cf_aes_context *ctx,
- const uint8_t *key,
- size_t nkey);
-
-/* .. c:function:: $DECL
- * Encrypts the given block, from :c:data:`in` to :c:data:`out`.
- * These may alias.
- *
- * Fails at runtime if :c:data:`ctx` is invalid.
- *
- * :param ctx: expanded key context
- * :param in: input block (read)
- * :param out: output block (written)
- */
-extern void cf_aes_encrypt(const cf_aes_context *ctx,
- const uint8_t in[AES_BLOCKSZ],
- uint8_t out[AES_BLOCKSZ]);
-
-/* .. c:function:: $DECL
- * Decrypts the given block, from :c:data:`in` to :c:data:`out`.
- * These may alias.
- *
- * Fails at runtime if :c:data:`ctx` is invalid.
- *
- * :param ctx: expanded key context
- * :param in: input block (read)
- * :param out: output block (written)
- */
-extern void cf_aes_decrypt(const cf_aes_context *ctx,
- const uint8_t in[AES_BLOCKSZ],
- uint8_t out[AES_BLOCKSZ]);
-
-/* .. c:function:: $DECL
- * Erase scheduled key material.
- *
- * Call this when you're done to erase the round keys. */
-extern void cf_aes_finish(cf_aes_context *ctx);
-
-/* .. c:var:: const cf_prp cf_aes
- * Abstract interface to AES. See :c:type:`cf_prp` for
- * more information. */
-extern const cf_prp cf_aes;
-
-#endif