chachapoly.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_CHACHAPOLY_H
#define MBEDTLS_CHACHAPOLY_H

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

/* for shared error codes */
#include "poly1305.h"

#define MBEDTLS_ERR_CHACHAPOLY_BAD_STATE            -0x0054 
#define MBEDTLS_ERR_CHACHAPOLY_AUTH_FAILED          -0x0056 
#ifdef __cplusplus
extern "C" {
#endif

typedef enum
{
    MBEDTLS_CHACHAPOLY_ENCRYPT,     
    MBEDTLS_CHACHAPOLY_DECRYPT      
}
mbedtls_chachapoly_mode_t;

#if !defined(MBEDTLS_CHACHAPOLY_ALT)

#include "chacha20.h"

typedef struct mbedtls_chachapoly_context
{
    mbedtls_chacha20_context chacha20_ctx;  
    mbedtls_poly1305_context poly1305_ctx;  
    uint64_t aad_len;                       
    uint64_t ciphertext_len;                
    int state;                              
    mbedtls_chachapoly_mode_t mode;         
}
mbedtls_chachapoly_context;

#else /* !MBEDTLS_CHACHAPOLY_ALT */
#include "chachapoly_alt.h"
#endif /* !MBEDTLS_CHACHAPOLY_ALT */

void mbedtls_chachapoly_init( mbedtls_chachapoly_context *ctx );

void mbedtls_chachapoly_free( mbedtls_chachapoly_context *ctx );

int mbedtls_chachapoly_setkey( mbedtls_chachapoly_context *ctx,
                               const unsigned char key[32] );

int mbedtls_chachapoly_starts( mbedtls_chachapoly_context *ctx,
                               const unsigned char nonce[12],
                               mbedtls_chachapoly_mode_t mode );

int mbedtls_chachapoly_update_aad( mbedtls_chachapoly_context *ctx,
                                   const unsigned char *aad,
                                   size_t aad_len );

int mbedtls_chachapoly_update( mbedtls_chachapoly_context *ctx,
                               size_t len,
                               const unsigned char *input,
                               unsigned char *output );

int mbedtls_chachapoly_finish( mbedtls_chachapoly_context *ctx,
                               unsigned char mac[16] );

int mbedtls_chachapoly_encrypt_and_tag( mbedtls_chachapoly_context *ctx,
                                        size_t length,
                                        const unsigned char nonce[12],
                                        const unsigned char *aad,
                                        size_t aad_len,
                                        const unsigned char *input,
                                        unsigned char *output,
                                        unsigned char tag[16] );

int mbedtls_chachapoly_auth_decrypt( mbedtls_chachapoly_context *ctx,
                                     size_t length,
                                     const unsigned char nonce[12],
                                     const unsigned char *aad,
                                     size_t aad_len,
                                     const unsigned char tag[16],
                                     const unsigned char *input,
                                     unsigned char *output );

#if defined(MBEDTLS_SELF_TEST)

int mbedtls_chachapoly_self_test( int verbose );
#endif /* MBEDTLS_SELF_TEST */

#ifdef __cplusplus
}
#endif

#endif /* MBEDTLS_CHACHAPOLY_H */