chacha.h

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/*
 * SPDX-FileCopyrightText: 2008 D. J. Bernstein (dedicated to the public domain)
 * SPDX-FileCopyrightText: 2015 René Kijewski <rene.kijewski@fu-berlin.de>
 * SPDX-License-Identifier: MIT
 */
 
#pragma once

 
#include <stdint.h>
#include <stddef.h>
 
#include "compiler_hints.h"
 
#ifdef __cplusplus
extern "C" {
#endif

typedef struct {
    uint32_t state[16]; 
    uint8_t rounds;     
} chacha_ctx;

ACCESS(read_only, 3, 4)
int chacha_init(chacha_ctx *ctx,
                unsigned rounds,
                const uint8_t *key, uint32_t keylen,
                const uint8_t nonce[8]);

void chacha_keystream_bytes(chacha_ctx *ctx, void *x);

void chacha_encrypt_bytes(chacha_ctx *ctx, const uint8_t *m, uint8_t *c);

static inline void chacha_decrypt_bytes(chacha_ctx *ctx, const uint8_t *m,
                                        uint8_t *c)
{
    chacha_encrypt_bytes(ctx, m, c);
}

ACCESS(read_only, 1, 2)
void chacha_prng_seed(const void *data, size_t bytes);

uint32_t chacha_prng_next(void);
 
#ifdef __cplusplus
}
#endif