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https://github.com/DarkMatterCore/nxdumptool.git
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47 lines
1.6 KiB
C
47 lines
1.6 KiB
C
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/*
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* aes.c
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*
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* Copyright (c) 2020, DarkMatterCore <pabloacurielz@gmail.com>.
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*
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* This file is part of nxdumptool (https://github.com/DarkMatterCore/nxdumptool).
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*
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* nxdumptool is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* nxdumptool is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* 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, see <http://www.gnu.org/licenses/>.
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*/
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#include "utils.h"
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size_t aes128XtsNintendoCrypt(Aes128XtsContext *ctx, void *dst, const void *src, size_t size, u64 sector, size_t sector_size, bool encrypt)
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{
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if (!ctx || !dst || !src || !size || !sector_size || (size % sector_size) != 0)
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{
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LOGFILE("Invalid parameters!");
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return 0;
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}
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size_t i, crypt_res = 0;
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u64 cur_sector = sector;
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u8 *dst_u8 = (u8*)dst;
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const u8 *src_u8 = (const u8*)src;
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for(i = 0; i < size; i += sector_size, cur_sector++)
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{
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/* We have to force a sector reset on each new sector to actually enable Nintendo AES-XTS cipher tweak. */
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aes128XtsContextResetSector(ctx, cur_sector, true);
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crypt_res = (encrypt ? aes128XtsEncrypt(ctx, dst_u8 + i, src_u8 + i, sector_size) : aes128XtsDecrypt(ctx, dst_u8 + i, src_u8 + i, sector_size));
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if (crypt_res != sector_size) break;
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}
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return i;
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}
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