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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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34
exosphere2/program/source/boot/secmon_package2.cpp
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@ -14,9 +14,39 @@
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <exosphere.hpp>
#include "../secmon_error.hpp"
#include "../secmon_key_storage.hpp"
#include "secmon_boot.hpp"
namespace ams::secmon::boot {
/* TODO */
bool VerifyPackage2Signature(pkg2::Package2Header &header, const void *mod, size_t mod_size) {
return VerifySignature(header.signature, sizeof(header.signature), mod, mod_size, std::addressof(header.meta), sizeof(header.meta));
}
}
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) {
/* Ensure that the SE sees consistent data. */
hw::FlushDataCache(key, key_size);
hw::FlushDataCache(src, src_size);
hw::FlushDataCache(dst, dst_size);
hw::DataSynchronizationBarrierInnerShareable();
/* Load the needed master key into the temporary keyslot. */
secmon::LoadMasterKey(pkg1::AesKeySlot_Temporary, key_generation);
/* Load the package2 key into the temporary keyslot. */
se::SetEncryptedAesKey128(pkg1::AesKeySlot_Temporary, pkg1::AesKeySlot_Temporary, key, key_size);
/* Decrypt the data. */
se::ComputeAes128Ctr(dst, dst_size, pkg1::AesKeySlot_Temporary, src, src_size, iv, iv_size);
/* Clear the keyslot we just used. */
se::ClearAesKeySlot(pkg1::AesKeySlot_Temporary);
/* Ensure that the cpu sees consistent data. */
hw::DataSynchronizationBarrierInnerShareable();
hw::FlushDataCache(dst, dst_size);
hw::DataSynchronizationBarrierInnerShareable();
}
}