chacha20.h

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/*
 *  Copyright The Mbed TLS Contributors
 *  SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
 */
 
#ifndef MBEDTLS_CHACHA20_H
#define MBEDTLS_CHACHA20_H
#include "mbedtls/private_access.h"
 
#include "mbedtls/build_info.h"
 
#include <stdint.h>
#include <stddef.h>

#define MBEDTLS_ERR_CHACHA20_BAD_INPUT_DATA         -0x0051
 
#ifdef __cplusplus
extern "C" {
#endif
 
#if !defined(MBEDTLS_CHACHA20_ALT)
 
typedef struct mbedtls_chacha20_context {
    uint32_t MBEDTLS_PRIVATE(state)[16];          
    uint8_t  MBEDTLS_PRIVATE(keystream8)[64];     
    size_t MBEDTLS_PRIVATE(keystream_bytes_used); 
}
mbedtls_chacha20_context;
 
#else  /* MBEDTLS_CHACHA20_ALT */
#include "chacha20_alt.h"
#endif /* MBEDTLS_CHACHA20_ALT */

void mbedtls_chacha20_init(mbedtls_chacha20_context *ctx);

void mbedtls_chacha20_free(mbedtls_chacha20_context *ctx);

int mbedtls_chacha20_setkey(mbedtls_chacha20_context *ctx,
                            const unsigned char key[32]);

int mbedtls_chacha20_starts(mbedtls_chacha20_context *ctx,
                            const unsigned char nonce[12],
                            uint32_t counter);

int mbedtls_chacha20_update(mbedtls_chacha20_context *ctx,
                            size_t size,
                            const unsigned char *input,
                            unsigned char *output);

int mbedtls_chacha20_crypt(const unsigned char key[32],
                           const unsigned char nonce[12],
                           uint32_t counter,
                           size_t size,
                           const unsigned char *input,
                           unsigned char *output);
 
#if defined(MBEDTLS_SELF_TEST)
int mbedtls_chacha20_self_test(int verbose);
#endif /* MBEDTLS_SELF_TEST */
 
#ifdef __cplusplus
}
#endif
 
#endif /* MBEDTLS_CHACHA20_H */