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
 
#if !defined(MBEDTLS_CONFIG_FILE)
#include "mbedtls/config.h"
#else
#include MBEDTLS_CONFIG_FILE
#endif
 
#include "mbedtls/cipher.h"
 
#include <stdint.h>
 
#define MBEDTLS_GCM_ENCRYPT     1
#define MBEDTLS_GCM_DECRYPT     0
 
#define MBEDTLS_ERR_GCM_AUTH_FAILED                       -0x0012  
/* MBEDTLS_ERR_GCM_HW_ACCEL_FAILED is deprecated and should not be used. */
#define MBEDTLS_ERR_GCM_HW_ACCEL_FAILED                   -0x0013  
#define MBEDTLS_ERR_GCM_BAD_INPUT                         -0x0014  
#ifdef __cplusplus
extern "C" {
#endif
 
#if !defined(MBEDTLS_GCM_ALT)
 
typedef struct mbedtls_gcm_context
{
    mbedtls_cipher_context_t cipher_ctx;  
    uint64_t HL[16];                      
    uint64_t HH[16];                      
    uint64_t len;                         
    uint64_t add_len;                     
    unsigned char base_ectr[16];          
    unsigned char y[16];                  
    unsigned char buf[16];                
    int 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,
                const unsigned char *add,
                size_t add_len );
 
int mbedtls_gcm_update( mbedtls_gcm_context *ctx,
                size_t length,
                const unsigned char *input,
                unsigned char *output );
 
int mbedtls_gcm_finish( mbedtls_gcm_context *ctx,
                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 */