cipher_mode_gcm.h

00001 /**
00002  * @file cipher_mode_gcm.h
00003  * @brief Galois/Counter Mode (GCM)
00004  *
00005  * @section License
00006  *
00007  * Copyright (C) 2010-2017 Oryx Embedded SARL. All rights reserved.
00008  *
00009  * This file is part of CycloneCrypto Open.
00010  *
00011  * This program is free software; you can redistribute it and/or
00012  * modify it under the terms of the GNU General Public License
00013  * as published by the Free Software Foundation; either version 2
00014  * of the License, or (at your option) any later version.
00015  *
00016  * This program is distributed in the hope that it will be useful,
00017  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00018  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00019  * GNU General Public License for more details.
00020  *
00021  * You should have received a copy of the GNU General Public License
00022  * along with this program; if not, write to the Free Software Foundation,
00023  * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
00024  *
00025  * @author Oryx Embedded SARL (www.oryx-embedded.com)
00026  * @version 1.7.6
00027  **/
00028 
00029 #ifndef _CIPHER_MODE_GCM_H
00030 #define _CIPHER_MODE_GCM_H
00031 
00032 //Dependencies
00033 #include "crypto.h"
00034 
00035 
00036 /**
00037  * @brief GCM context
00038  **/
00039 
00040 typedef struct
00041 {
00042    const CipherAlgo *cipherAlgo; ///<Cipher algorithm
00043    void *cipherContext;          ///<Cipher algorithm context
00044    uint32_t m[16][4];            ///<Precalculated table
00045 } GcmContext;
00046 
00047 
00048 //GCM related functions
00049 error_t gcmInit(GcmContext *context, const CipherAlgo *cipherAlgo, void *cipherContext);
00050 
00051 error_t gcmEncrypt(GcmContext *context, const uint8_t *iv, size_t ivLen, const uint8_t *a,
00052    size_t aLen, const uint8_t *p, uint8_t *c, size_t length, uint8_t *t, size_t tLen);
00053 
00054 error_t gcmDecrypt(GcmContext *context, const uint8_t *iv, size_t ivLen, const uint8_t *a,
00055    size_t aLen, const uint8_t *c, uint8_t *p, size_t length, const uint8_t *t, size_t tLen);
00056 
00057 void gcmMul(GcmContext *context, uint8_t *x);
00058 void gcmXorBlock(uint8_t *x, const uint8_t *a, const uint8_t *b, size_t n);
00059 void gcmIncCounter(uint8_t *x);
00060 
00061 #endif
00062