gcm.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_GCM_H
#define MBEDTLS_GCM_H
#include "mbedtls/private_access.h"

#include "mbedtls/build_info.h"

#include "mbedtls/cipher.h"

#include <stdint.h>

#define MBEDTLS_GCM_ENCRYPT     1
#define MBEDTLS_GCM_DECRYPT     0

#define MBEDTLS_ERR_GCM_AUTH_FAILED                       -0x0012

#define MBEDTLS_ERR_GCM_BAD_INPUT                         -0x0014

#define MBEDTLS_ERR_GCM_BUFFER_TOO_SMALL                  -0x0016

#ifdef __cplusplus
extern "C" {
#endif

#if !defined(MBEDTLS_GCM_ALT)

typedef struct mbedtls_gcm_context
{
    mbedtls_cipher_context_t MBEDTLS_PRIVATE(cipher_ctx);  
    uint64_t MBEDTLS_PRIVATE(HL)[16];                      
    uint64_t MBEDTLS_PRIVATE(HH)[16];                      
    uint64_t MBEDTLS_PRIVATE(len);                         
    uint64_t MBEDTLS_PRIVATE(add_len);                     
    unsigned char MBEDTLS_PRIVATE(base_ectr)[16];          
    unsigned char MBEDTLS_PRIVATE(y)[16];                  
    unsigned char MBEDTLS_PRIVATE(buf)[16];                
    int MBEDTLS_PRIVATE(mode);                             
}
mbedtls_gcm_context;

#else  /* !MBEDTLS_GCM_ALT */
#include "gcm_alt.h"
#endif /* !MBEDTLS_GCM_ALT */

void mbedtls_gcm_init( mbedtls_gcm_context *ctx );

int mbedtls_gcm_setkey( mbedtls_gcm_context *ctx,
                        mbedtls_cipher_id_t cipher,
                        const unsigned char *key,
                        unsigned int keybits );

int mbedtls_gcm_crypt_and_tag( mbedtls_gcm_context *ctx,
                       int mode,
                       size_t length,
                       const unsigned char *iv,
                       size_t iv_len,
                       const unsigned char *add,
                       size_t add_len,
                       const unsigned char *input,
                       unsigned char *output,
                       size_t tag_len,
                       unsigned char *tag );

int mbedtls_gcm_auth_decrypt( mbedtls_gcm_context *ctx,
                      size_t length,
                      const unsigned char *iv,
                      size_t iv_len,
                      const unsigned char *add,
                      size_t add_len,
                      const unsigned char *tag,
                      size_t tag_len,
                      const unsigned char *input,
                      unsigned char *output );

int mbedtls_gcm_starts( mbedtls_gcm_context *ctx,
                        int mode,
                        const unsigned char *iv,
                        size_t iv_len );

int mbedtls_gcm_update_ad( mbedtls_gcm_context *ctx,
                           const unsigned char *add,
                           size_t add_len );

int mbedtls_gcm_update( mbedtls_gcm_context *ctx,
                        const unsigned char *input, size_t input_length,
                        unsigned char *output, size_t output_size,
                        size_t *output_length );

int mbedtls_gcm_finish( mbedtls_gcm_context *ctx,
                        unsigned char *output, size_t output_size,
                        size_t *output_length,
                        unsigned char *tag, size_t tag_len );

void mbedtls_gcm_free( mbedtls_gcm_context *ctx );

#if defined(MBEDTLS_SELF_TEST)

int mbedtls_gcm_self_test( int verbose );

#endif /* MBEDTLS_SELF_TEST */

#ifdef __cplusplus
}
#endif


#endif /* gcm.h */