chacha20.h

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/*  Copyright (C) 2006-2018, Arm Limited (or its affiliates), All Rights Reserved.
 *  SPDX-License-Identifier: Apache-2.0
 *
 *  Licensed under the Apache License, Version 2.0 (the "License"); you may
 *  not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 *  This file is part of Mbed TLS (https://tls.mbed.org)
 */

#ifndef MBEDTLS_CHACHA20_H
#define MBEDTLS_CHACHA20_H

#if !defined(MBEDTLS_CONFIG_FILE)
#include "config.h"
#else
#include MBEDTLS_CONFIG_FILE
#endif

#include <stdint.h>
#include <stddef.h>

#define MBEDTLS_ERR_CHACHA20_BAD_INPUT_DATA         -0x0051 
/* MBEDTLS_ERR_CHACHA20_FEATURE_UNAVAILABLE is deprecated and should not be
 * used. */
#define MBEDTLS_ERR_CHACHA20_FEATURE_UNAVAILABLE    -0x0053 
/* MBEDTLS_ERR_CHACHA20_HW_ACCEL_FAILED is deprecated and should not be used.
 */
#define MBEDTLS_ERR_CHACHA20_HW_ACCEL_FAILED        -0x0055  
#ifdef __cplusplus
extern "C" {
#endif

#if !defined(MBEDTLS_CHACHA20_ALT)

typedef struct mbedtls_chacha20_context
{
    uint32_t state[16];          
    uint8_t  keystream8[64];     
    size_t 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 */