mirror of
https://github.com/DarkMatterCore/nxdumptool.git
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83 lines
2.5 KiB
C
83 lines
2.5 KiB
C
/*
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* aes.h
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*
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* Copyright (c) 2020-2021, 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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#pragma once
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#ifndef __AES_H__
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#define __AES_H__
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/// Performs an AES-128-XTS crypto operation using the non-standard Nintendo XTS tweak.
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/// The Aes128XtsContext element should have been previously initialized with aes128XtsContextCreate(). 'encrypt' should match the value of 'is_encryptor' used with that call.
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/// 'dst' and 'src' can both point to the same address.
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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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/// Initializes an output AES partial counter using an initial CTR value and an offset.
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/// The size for both 'out' and 'ctr' should be at least AES_BLOCK_SIZE.
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NX_INLINE void aes128CtrInitializePartialCtr(u8 *out, const u8 *ctr, u64 offset)
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{
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if (!out || !ctr) return;
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offset >>= 4;
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for(u8 i = 0; i < 8; i++)
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{
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out[i] = ctr[0x8 - i - 1];
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out[0x10 - i - 1] = (u8)(offset & 0xFF);
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offset >>= 8;
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}
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}
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/// Updates the provided AES partial counter using an offset.
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/// 'out' size should be at least AES_BLOCK_SIZE.
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NX_INLINE void aes128CtrUpdatePartialCtr(u8 *ctr, u64 offset)
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{
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if (!ctr) return;
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offset >>= 4;
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for(u8 i = 0; i < 8; i++)
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{
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ctr[0x10 - i - 1] = (u8)(offset & 0xFF);
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offset >>= 8;
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}
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}
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/// Updates the provided AES partial counter using an offset and a 32-bit CTR value.
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/// 'out' size should be at least AES_BLOCK_SIZE.
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NX_INLINE void aes128CtrUpdatePartialCtrEx(u8 *ctr, u32 ctr_val, u64 offset)
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{
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if (!ctr) return;
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offset >>= 4;
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for(u8 i = 0; i < 8; i++)
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{
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ctr[0x10 - i - 1] = (u8)(offset & 0xFF);
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offset >>= 8;
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}
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for(u8 i = 0; i < 4; i++)
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{
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ctr[0x8 - i - 1] = (u8)(ctr_val & 0xFF);
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ctr_val >>= 8;
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}
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}
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#endif /* __AES_H__ */
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