chachapoly.h

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/*
 *  Copyright The Mbed TLS Contributors
 *  SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
 *
 *  This file is provided under the Apache License 2.0, or the
 *  GNU General Public License v2.0 or later.
 *
 *  **********
 *  Apache License 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.
 *
 *  **********
 *
 *  **********
 *  GNU General Public License v2.0 or later:
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
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 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 *  You should have received a copy of the GNU General Public License along
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 */
 
#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 */