ocrypto_chacha20.h

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/*
 * Copyright (c) 2016 - 2025 Nordic Semiconductor ASA
 * Copyright (c) since 2013 Oberon microsystems AG
 *
 * SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
 */
 
 
#ifndef OCRYPTO_CHACHA20_H
#define OCRYPTO_CHACHA20_H
 
#include <stddef.h>
#include <stdint.h>
 
 
#ifdef __cplusplus
extern "C" {
#endif
 
 
#define ocrypto_chacha20_KEY_BYTES (32)
 
#define ocrypto_chacha20_NONCE_BYTES_MAX (12)
 
 
typedef struct {
    uint32_t x[16];    // generator state
    uint8_t  cipher[64];
    uint8_t  position; // Current position in cipher.
} ocrypto_chacha20_ctx;
void ocrypto_chacha20_init(
    ocrypto_chacha20_ctx *ctx,
    const uint8_t *n, size_t n_len,
    const uint8_t key[ocrypto_chacha20_KEY_BYTES],
    uint32_t count);
 
void ocrypto_chacha20_update(
    ocrypto_chacha20_ctx *ctx,
    uint8_t *c,
    const uint8_t *m, size_t m_len);
void ocrypto_chacha20_encode(
    uint8_t *c,
    const uint8_t *m, size_t m_len,
    const uint8_t *n, size_t n_len,
    const uint8_t key[ocrypto_chacha20_KEY_BYTES],
    uint32_t count);
 
#ifdef __cplusplus
}
#endif
 
#endif