ccm.h

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/*
 *  Copyright The Mbed TLS Contributors
 *  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.
 */

#ifndef MBEDTLS_CCM_H
#define MBEDTLS_CCM_H
#include "mbedtls/private_access.h"

#include "mbedtls/build_info.h"

#include "mbedtls/cipher.h"

#define MBEDTLS_CCM_DECRYPT       0
#define MBEDTLS_CCM_ENCRYPT       1
#define MBEDTLS_CCM_STAR_DECRYPT  2
#define MBEDTLS_CCM_STAR_ENCRYPT  3

#define MBEDTLS_ERR_CCM_BAD_INPUT       -0x000D

#define MBEDTLS_ERR_CCM_AUTH_FAILED     -0x000F

#ifdef __cplusplus
extern "C" {
#endif

#if !defined(MBEDTLS_CCM_ALT)
// Regular implementation
//

typedef struct mbedtls_ccm_context
{
    unsigned char MBEDTLS_PRIVATE(y)[16];    
    unsigned char MBEDTLS_PRIVATE(ctr)[16];  
    mbedtls_cipher_context_t MBEDTLS_PRIVATE(cipher_ctx);    
    size_t MBEDTLS_PRIVATE(plaintext_len);   
    size_t MBEDTLS_PRIVATE(add_len);         
    size_t MBEDTLS_PRIVATE(tag_len);         
    size_t MBEDTLS_PRIVATE(processed);       
    unsigned char MBEDTLS_PRIVATE(q);        
    unsigned char MBEDTLS_PRIVATE(mode);     
    int MBEDTLS_PRIVATE(state);              
}
mbedtls_ccm_context;

#else  /* MBEDTLS_CCM_ALT */
#include "ccm_alt.h"
#endif /* MBEDTLS_CCM_ALT */

void mbedtls_ccm_init( mbedtls_ccm_context *ctx );

int mbedtls_ccm_setkey( mbedtls_ccm_context *ctx,
                        mbedtls_cipher_id_t cipher,
                        const unsigned char *key,
                        unsigned int keybits );

void mbedtls_ccm_free( mbedtls_ccm_context *ctx );

int mbedtls_ccm_encrypt_and_tag( mbedtls_ccm_context *ctx, size_t length,
                         const unsigned char *iv, size_t iv_len,
                         const unsigned char *ad, size_t ad_len,
                         const unsigned char *input, unsigned char *output,
                         unsigned char *tag, size_t tag_len );

int mbedtls_ccm_star_encrypt_and_tag( mbedtls_ccm_context *ctx, size_t length,
                         const unsigned char *iv, size_t iv_len,
                         const unsigned char *ad, size_t ad_len,
                         const unsigned char *input, unsigned char *output,
                         unsigned char *tag, size_t tag_len );

int mbedtls_ccm_auth_decrypt( mbedtls_ccm_context *ctx, size_t length,
                      const unsigned char *iv, size_t iv_len,
                      const unsigned char *ad, size_t ad_len,
                      const unsigned char *input, unsigned char *output,
                      const unsigned char *tag, size_t tag_len );

int mbedtls_ccm_star_auth_decrypt( mbedtls_ccm_context *ctx, size_t length,
                      const unsigned char *iv, size_t iv_len,
                      const unsigned char *ad, size_t ad_len,
                      const unsigned char *input, unsigned char *output,
                      const unsigned char *tag, size_t tag_len );

int mbedtls_ccm_starts( mbedtls_ccm_context *ctx,
                        int mode,
                        const unsigned char *iv,
                        size_t iv_len );

int mbedtls_ccm_set_lengths( mbedtls_ccm_context *ctx,
                             size_t total_ad_len,
                             size_t plaintext_len,
                             size_t tag_len );

int mbedtls_ccm_update_ad( mbedtls_ccm_context *ctx,
                           const unsigned char *ad,
                           size_t ad_len );

int mbedtls_ccm_update( mbedtls_ccm_context *ctx,
                        const unsigned char *input, size_t input_len,
                        unsigned char *output, size_t output_size,
                        size_t *output_len );

int mbedtls_ccm_finish( mbedtls_ccm_context *ctx,
                        unsigned char *tag, size_t tag_len );

#if defined(MBEDTLS_SELF_TEST) && defined(MBEDTLS_AES_C)

int mbedtls_ccm_self_test( int verbose );
#endif /* MBEDTLS_SELF_TEST && MBEDTLS_AES_C */

#ifdef __cplusplus
}
#endif

#endif /* MBEDTLS_CCM_H */