mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
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52 lines
2.2 KiB
C++
52 lines
2.2 KiB
C++
/*
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* Copyright (c) 2018-2020 Atmosphère-NX
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*
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* This program 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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* This program 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 <exosphere.hpp>
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#include "../secmon_error.hpp"
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#include "../secmon_key_storage.hpp"
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#include "secmon_boot.hpp"
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namespace ams::secmon::boot {
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bool VerifyPackage2Signature(pkg2::Package2Header &header, const void *mod, size_t mod_size) {
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return VerifySignature(header.signature, sizeof(header.signature), mod, mod_size, std::addressof(header.meta), sizeof(header.meta));
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}
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void DecryptPackage2(void *dst, size_t dst_size, const void *src, size_t src_size, const void *key, size_t key_size, const void *iv, size_t iv_size, u8 key_generation) {
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/* Ensure that the SE sees consistent data. */
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hw::FlushDataCache(key, key_size);
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hw::FlushDataCache(src, src_size);
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hw::FlushDataCache(dst, dst_size);
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hw::DataSynchronizationBarrierInnerShareable();
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/* Load the needed master key into the temporary keyslot. */
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secmon::LoadMasterKey(pkg1::AesKeySlot_Temporary, key_generation);
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/* Load the package2 key into the temporary keyslot. */
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se::SetEncryptedAesKey128(pkg1::AesKeySlot_Temporary, pkg1::AesKeySlot_Temporary, key, key_size);
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/* Decrypt the data. */
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se::ComputeAes128Ctr(dst, dst_size, pkg1::AesKeySlot_Temporary, src, src_size, iv, iv_size);
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/* Clear the keyslot we just used. */
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se::ClearAesKeySlot(pkg1::AesKeySlot_Temporary);
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/* Ensure that the cpu sees consistent data. */
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hw::DataSynchronizationBarrierInnerShareable();
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hw::FlushDataCache(dst, dst_size);
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hw::DataSynchronizationBarrierInnerShareable();
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}
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}
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