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exo2: implement through package2 decryption

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Michael Scire 2020-05-12 11:40:29 -07:00 • committed by SciresM
parent 9ddcbe9dc3
commit f391354415
11 changed files with 316 additions and 12 deletions
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81
libraries/libexosphere/include/exosphere/pkg2.hpp Normal file
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/*
* Copyright (c) 2018-2020 Atmosphère-NX
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope 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 <http://www.gnu.org/licenses/>.
*/
#pragma once
#include <vapours.hpp>
namespace ams::pkg2 {
constexpr inline size_t Package2SizeMax = 8_MB - 16_KB;
constexpr inline size_t SegmentAlignment = 4;
constexpr inline int SegmentCount = 3;
constexpr inline int MinimumValidDataVersion = 0; /* We allow older package2 to load; this value is currently 0x10 in Nintendo's code. */
constexpr inline int CurrentBootloaderVersion = 0xD;
struct Package2Meta {
using Magic = util::FourCC<'P','K','2','1'>;
u32 package2_size;
u8 key_generation;
u8 header_iv_remainder[11];
u8 segment_iv[SegmentCount][0x10];
u8 padding_40[0x10];
u8 magic[4];
u32 entrypoint;
u8 padding_58[4];
u8 package2_version;
u8 bootloader_version;
u8 padding_5E[2];
u32 segment_sizes[SegmentCount];
u8 padding_6C[4];
u32 segment_offsets[SegmentCount];
u8 padding_7C[4];
u8 segment_hashes[SegmentCount][crypto::Sha256Generator::HashSize];
u8 padding_E0[0x20];
private:
static ALWAYS_INLINE u32 ReadWord(const void *ptr, int offset) {
return util::LoadLittleEndian(reinterpret_cast<const u32 *>(reinterpret_cast<uintptr_t>(ptr) + offset));
}
public:
ALWAYS_INLINE u8 GetKeyGeneration() const {
return std::min<u8>(0, (this->key_generation ^ this->header_iv_remainder[1] ^ this->header_iv_remainder[2]) - 1);
}
ALWAYS_INLINE u32 GetSize() const {
return this->package2_size ^ ReadWord(this->header_iv_remainder, 3) ^ ReadWord(this->header_iv_remainder, 7);
}
};
static_assert(util::is_pod<Package2Meta>::value);
static_assert(sizeof(Package2Meta) == 0x100);
struct Package2Header {
u8 signature[0x100];
Package2Meta meta;
};
static_assert(util::is_pod<Package2Header>::value);
static_assert(sizeof(Package2Header) == 0x200);
struct StorageLayout {
u8 boot_config[16_KB];
Package2Header package2_header;
u8 data[Package2SizeMax - sizeof(Package2Header)];
};
static_assert(util::is_pod<StorageLayout>::value);
static_assert(sizeof(StorageLayout) == 8_MB);
}