lilcrypto/impl_chacha20.h

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2024-05-31 12:59:58 +02:00
/*
* Copyright (c) 2024 Lucas Gabriel Vuotto <lucas@lgv5.net>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <stddef.h>
#include <stdint.h>
#include "lilcrypto.h"
#define CHACHA20_CHUNK 64
#define CHACHA20_CHUNK_WORDS (CHACHA20_CHUNK / sizeof(uint32_t))
#define CHACHA20_CTRMAX 4294967295 /* 2^32 - 1 */
#define CHACHA20_KEY_WORDS (LC_CHACHA20_KEYLEN / sizeof(uint32_t))
#define CHACHA20_NONCE_WORDS (LC_CHACHA20_IVLEN / sizeof(uint32_t))
#define CHACHA20_ROUNDS 10
struct chacha20_ctx {
uint32_t s[CHACHA20_CHUNK_WORDS];
uint32_t k[CHACHA20_KEY_WORDS];
uint32_t c;
uint32_t n[CHACHA20_NONCE_WORDS];
size_t blen;
};
void chacha20_block(struct chacha20_ctx *);