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93 lines
2.4 KiB
C
93 lines
2.4 KiB
C
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/**
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* @file gcm.h
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* @brief Galois/Counter Mode (GCM)
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*
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* @section License
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*
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* Copyright (C) 2010-2024 Oryx Embedded SARL. All rights reserved.
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*
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* This file is part of CycloneCRYPTO Open.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* @author Oryx Embedded SARL (www.oryx-embedded.com)
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* @version 2.4.4
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**/
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#ifndef _GCM_H
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#define _GCM_H
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//Dependencies
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#include "core/crypto.h"
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//Precalculated table width, in bits
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#ifndef GCM_TABLE_W
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#define GCM_TABLE_W 4
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#elif (GCM_TABLE_W != 4 && GCM_TABLE_W != 8)
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#error GCM_TABLE_W parameter is not valid
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#endif
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//4-bit or 8-bit precalculated table?
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#if (GCM_TABLE_W == 4)
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#define GCM_TABLE_N 16
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#define GCM_REVERSE_BITS(n) reverseInt4(n)
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#else
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#define GCM_TABLE_N 256
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#define GCM_REVERSE_BITS(n) reverseInt8(n)
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#endif
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//C++ guard
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* @brief GCM context
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**/
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typedef struct
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{
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const CipherAlgo *cipherAlgo; ///<Cipher algorithm
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void *cipherContext; ///<Cipher algorithm context
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uint32_t m[GCM_TABLE_N][4]; ///<Precalculated table
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} GcmContext;
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//GCM related functions
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error_t gcmInit(GcmContext *context, const CipherAlgo *cipherAlgo,
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void *cipherContext);
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error_t gcmEncrypt(GcmContext *context, const uint8_t *iv,
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size_t ivLen, const uint8_t *a, size_t aLen, const uint8_t *p,
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uint8_t *c, size_t length, uint8_t *t, size_t tLen);
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error_t gcmDecrypt(GcmContext *context, const uint8_t *iv,
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size_t ivLen, const uint8_t *a, size_t aLen, const uint8_t *c,
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uint8_t *p, size_t length, const uint8_t *t, size_t tLen);
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void gcmMul(GcmContext *context, uint8_t *x);
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void gcmXorBlock(uint8_t *x, const uint8_t *a, const uint8_t *b, size_t n);
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void gcmIncCounter(uint8_t *ctr);
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//C++ guard
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#ifdef __cplusplus
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}
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#endif
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#endif
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