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service: nfp: Allow amiibos without keys

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This commit is contained in:
Narr the Reg 2022-10-21 22:20:27 -05:00
parent 82fdfb33ac
commit 3e0aaeba98
3 changed files with 18 additions and 1 deletions
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8
src/core/hle/service/nfp/amiibo_crypto.cpp
View file

@ -9,6 +9,7 @@
#include <mbedtls/hmac_drbg.h>
#include "common/fs/file.h"
#include "common/fs/fs.h"
#include "common/fs/path_util.h"
#include "common/logging/log.h"
#include "core/hle/service/mii/mii_manager.h"
@ -279,7 +280,7 @@ bool LoadKeys(InternalKey& locked_secret, InternalKey& unfixed_info) {
Common::FS::FileType::BinaryFile};
if (!keys_file.IsOpen()) {
LOG_ERROR(Service_NFP, "No keys detected");
LOG_ERROR(Service_NFP, "Failed to open key file");
return false;
}
@ -295,6 +296,11 @@ bool LoadKeys(InternalKey& locked_secret, InternalKey& unfixed_info) {
return true;
}
bool IsKeyAvailable() {
const auto yuzu_keys_dir = Common::FS::GetYuzuPath(Common::FS::YuzuPath::KeysDir);
return Common::FS::Exists(yuzu_keys_dir / "key_retail.bin");
}
bool DecodeAmiibo(const EncryptedNTAG215File& encrypted_tag_data, NTAG215File& tag_data) {
InternalKey locked_secret{};
InternalKey unfixed_info{};

3
src/core/hle/service/nfp/amiibo_crypto.h
View file

@ -91,6 +91,9 @@ void Cipher(const DerivedKeys& keys, const NTAG215File& in_data, NTAG215File& ou
/// Loads both amiibo keys from key_retail.bin
bool LoadKeys(InternalKey& locked_secret, InternalKey& unfixed_info);
/// Returns true if key_retail.bin exist
bool IsKeyAvailable();
/// Decodes encripted amiibo data returns true if output is valid
bool DecodeAmiibo(const EncryptedNTAG215File& encrypted_tag_data, NTAG215File& tag_data);

8
src/core/hle/service/nfp/nfp_device.cpp
View file

@ -234,6 +234,14 @@ Result NfpDevice::Mount(MountTarget mount_target_) {
return NotAnAmiibo;
}
// Mark amiibos as read only when keys are missing
if (!AmiiboCrypto::IsKeyAvailable()) {
LOG_ERROR(Service_NFP, "No keys detected");
device_state = DeviceState::TagMounted;
mount_target = MountTarget::Rom;
return ResultSuccess;
}
if (!AmiiboCrypto::DecodeAmiibo(encrypted_tag_data, tag_data)) {
LOG_ERROR(Service_NFP, "Can't decode amiibo {}", device_state);
return CorruptedData;