41 lines
1.3 KiB
C
41 lines
1.3 KiB
C
|
/*
|
||
|
|
* 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 *);
|