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Code Issues Releases Activity

key_manager/partition_data_manager: Silence truncation compiler warnings

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This commit is contained in:
Lioncash 2018-10-13 09:13:19 -04:00
parent f56a8da46a
commit 6da2ed4232
4 changed files with 15 additions and 10 deletions
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7
src/core/crypto/key_manager.cpp
View file

@ -98,7 +98,7 @@ std::array<u8, 144> DecryptKeyblob(const std::array<u8, 176>& encrypted_keyblob,
return keyblob;
}
void KeyManager::DeriveGeneralPurposeKeys(u8 crypto_revision) {
void KeyManager::DeriveGeneralPurposeKeys(std::size_t crypto_revision) {
const auto kek_generation_source =
GetKey(S128KeyType::Source, static_cast<u64>(SourceKeyType::AESKekGeneration));
const auto key_generation_source =
@ -270,6 +270,9 @@ static std::array<u8, size> operator^(const std::array<u8, size>& lhs,
template <size_t target_size, size_t in_size>
static std::array<u8, target_size> MGF1(const std::array<u8, in_size>& seed) {
// Avoids truncation overflow within the loop below.
static_assert(target_size <= 0xFF);
std::array<u8, in_size + 4> seed_exp{};
std::memcpy(seed_exp.data(), seed.data(), in_size);
@ -277,7 +280,7 @@ static std::array<u8, target_size> MGF1(const std::array<u8, in_size>& seed) {
size_t i = 0;
while (out.size() < target_size) {
out.resize(out.size() + 0x20);
seed_exp[in_size + 3] = i;
seed_exp[in_size + 3] = static_cast<u8>(i);
mbedtls_sha256(seed_exp.data(), seed_exp.size(), out.data() + out.size() - 0x20, 0);
++i;
}

2
src/core/crypto/key_manager.h
View file

@ -175,7 +175,7 @@ private:
void WriteKeyToFile(KeyCategory category, std::string_view keyname,
const std::array<u8, Size>& key);
void DeriveGeneralPurposeKeys(u8 crypto_revision);
void DeriveGeneralPurposeKeys(std::size_t crypto_revision);
void SetKeyWrapped(S128KeyType id, Key128 key, u64 field1 = 0, u64 field2 = 0);
void SetKeyWrapped(S256KeyType id, Key256 key, u64 field1 = 0, u64 field2 = 0);

12
src/core/crypto/partition_data_manager.cpp
View file

@ -332,7 +332,8 @@ FileSys::VirtualFile PartitionDataManager::GetBoot0Raw() const {
return boot0;
}
PartitionDataManager::EncryptedKeyBlob PartitionDataManager::GetEncryptedKeyblob(u8 index) const {
PartitionDataManager::EncryptedKeyBlob PartitionDataManager::GetEncryptedKeyblob(
std::size_t index) const {
if (HasBoot0() && index < NUM_ENCRYPTED_KEYBLOBS)
return GetEncryptedKeyblobs()[index];
return {};
@ -389,7 +390,7 @@ std::array<u8, 16> PartitionDataManager::GetKeyblobMACKeySource() const {
return FindKeyFromHex(package1_decrypted_bytes, source_hashes[0]);
}
std::array<u8, 16> PartitionDataManager::GetKeyblobKeySource(u8 revision) const {
std::array<u8, 16> PartitionDataManager::GetKeyblobKeySource(std::size_t revision) const {
if (keyblob_source_hashes[revision] == SHA256Hash{}) {
LOG_WARNING(Crypto,
"No keyblob source hash for crypto revision {:02X}! Cannot derive keys...",
@ -456,13 +457,14 @@ void PartitionDataManager::DecryptPackage2(std::array<std::array<u8, 16>, 0x20>
if (file->ReadObject(&header) != sizeof(Package2Header))
return;
u8 revision = 0xFF;
std::size_t revision = 0xFF;
if (header.magic != Common::MakeMagic('P', 'K', '2', '1')) {
for (size_t i = 0; i < package2_keys.size(); ++i) {
if (AttemptDecrypt(package2_keys[i], header))
for (std::size_t i = 0; i < package2_keys.size(); ++i) {
if (AttemptDecrypt(package2_keys[i], header)) {
revision = i;
}
}
}
if (header.magic != Common::MakeMagic('P', 'K', '2', '1'))
return;

4
src/core/crypto/partition_data_manager.h
View file

@ -34,7 +34,7 @@ public:
// BOOT0
bool HasBoot0() const;
FileSys::VirtualFile GetBoot0Raw() const;
EncryptedKeyBlob GetEncryptedKeyblob(u8 index) const;
EncryptedKeyBlob GetEncryptedKeyblob(std::size_t index) const;
EncryptedKeyBlobs GetEncryptedKeyblobs() const;
std::vector<u8> GetSecureMonitor() const;
std::array<u8, 0x10> GetPackage2KeySource() const;
@ -46,7 +46,7 @@ public:
std::vector<u8> GetPackage1Decrypted() const;
std::array<u8, 0x10> GetMasterKeySource() const;
std::array<u8, 0x10> GetKeyblobMACKeySource() const;
std::array<u8, 0x10> GetKeyblobKeySource(u8 revision) const;
std::array<u8, 0x10> GetKeyblobKeySource(std::size_t revision) const;
// Fuses
bool HasFuses() const;