gcm.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_GCM_H
#define MBEDTLS_GCM_H

#include "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 );

int mbedtls_gcm_self_test( int verbose );

#ifdef __cplusplus
}
#endif


#endif /* gcm.h */