mirror of
https://github.com/DarkMatterCore/nxdumptool.git
synced 2024-11-08 19:52:12 +00:00
92 lines
2.7 KiB
C
92 lines
2.7 KiB
C
/*
|
|
* aes.h
|
|
*
|
|
* Copyright (c) 2020-2022, DarkMatterCore <pabloacurielz@gmail.com>.
|
|
*
|
|
* This file is part of nxdumptool (https://github.com/DarkMatterCore/nxdumptool).
|
|
*
|
|
* nxdumptool is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation, either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* nxdumptool is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program. If not, see <https://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#ifndef __AES_H__
|
|
#define __AES_H__
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
/// Performs an AES-128-XTS crypto operation using the non-standard Nintendo XTS tweak.
|
|
/// The Aes128XtsContext element should have been previously initialized with aes128XtsContextCreate(). 'encrypt' should match the value of 'is_encryptor' used with that call.
|
|
/// 'dst' and 'src' can both point to the same address.
|
|
size_t aes128XtsNintendoCrypt(Aes128XtsContext *ctx, void *dst, const void *src, size_t size, u64 sector, size_t sector_size, bool encrypt);
|
|
|
|
/// Initializes an output AES partial counter using an initial CTR value and an offset.
|
|
/// The sizes for 'out' and 'ctr' should be at least AES_BLOCK_SIZE and 8 bytes, respectively.
|
|
NX_INLINE void aes128CtrInitializePartialCtr(u8 *out, const u8 *ctr, u64 offset)
|
|
{
|
|
if (!out || !ctr) return;
|
|
|
|
offset >>= 4;
|
|
|
|
for(u8 i = 0; i < 8; i++)
|
|
{
|
|
out[i] = ctr[0x8 - i - 1];
|
|
out[0x10 - i - 1] = (u8)(offset & 0xFF);
|
|
offset >>= 8;
|
|
}
|
|
}
|
|
|
|
/// Updates the provided AES partial counter using an offset.
|
|
/// Size for 'out' should be at least AES_BLOCK_SIZE.
|
|
NX_INLINE void aes128CtrUpdatePartialCtr(u8 *ctr, u64 offset)
|
|
{
|
|
if (!ctr) return;
|
|
|
|
offset >>= 4;
|
|
|
|
for(u8 i = 0; i < 8; i++)
|
|
{
|
|
ctr[0x10 - i - 1] = (u8)(offset & 0xFF);
|
|
offset >>= 8;
|
|
}
|
|
}
|
|
|
|
/// Updates the provided AES partial counter using an offset and a 32-bit CTR value.
|
|
/// Size for 'out' should be at least AES_BLOCK_SIZE.
|
|
NX_INLINE void aes128CtrUpdatePartialCtrEx(u8 *ctr, u32 ctr_val, u64 offset)
|
|
{
|
|
if (!ctr) return;
|
|
|
|
offset >>= 4;
|
|
|
|
for(u8 i = 0; i < 8; i++)
|
|
{
|
|
ctr[0x10 - i - 1] = (u8)(offset & 0xFF);
|
|
offset >>= 8;
|
|
}
|
|
|
|
for(u8 i = 0; i < 4; i++)
|
|
{
|
|
ctr[0x8 - i - 1] = (u8)(ctr_val & 0xFF);
|
|
ctr_val >>= 8;
|
|
}
|
|
}
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* __AES_H__ */
|