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/*
* Copyright (C) 2016 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef _FSCRYPT_H_
#define _FSCRYPT_H_
#include <string>
#ifndef FSCRYPT_POLICY_FLAG_IV_INO_LBLK_32
// When FSCRYPT_POLICY_FLAG_IV_INO_LBLK_32 is added to Bionic's linux/fscrypt.h
// then this whole stanza should be removed.
#define FSCRYPT_POLICY_FLAG_IV_INO_LBLK_32 0x10
#endif
bool fscrypt_is_native();
static const char* fscrypt_unencrypted_folder = "/unencrypted";
static const char* fscrypt_key_ref = "/unencrypted/ref";
static const char* fscrypt_key_per_boot_ref = "/unencrypted/per_boot_ref";
static const char* fscrypt_key_mode = "/unencrypted/mode";
namespace android {
namespace fscrypt {
struct EncryptionOptions {
int version;
int contents_mode;
int filenames_mode;
int flags;
bool use_hw_wrapped_key;
// Ensure that "version" is not valid on creation and so must be explicitly set
EncryptionOptions() : version(0) {}
};
struct EncryptionPolicy {
EncryptionOptions options;
std::string key_raw_ref;
};
void BytesToHex(const std::string& bytes, std::string* hex);
unsigned int GetFirstApiLevel();
bool OptionsToString(const EncryptionOptions& options, std::string* options_string);
bool OptionsToStringForApiLevel(unsigned int first_api_level, const EncryptionOptions& options,
std::string* options_string);
bool ParseOptions(const std::string& options_string, EncryptionOptions* options);
bool ParseOptionsForApiLevel(unsigned int first_api_level, const std::string& options_string,
EncryptionOptions* options);
bool EnsurePolicy(const EncryptionPolicy& policy, const std::string& directory);
inline bool operator==(const EncryptionOptions& lhs, const EncryptionOptions& rhs) {
return (lhs.version == rhs.version) && (lhs.contents_mode == rhs.contents_mode) &&
(lhs.filenames_mode == rhs.filenames_mode) && (lhs.flags == rhs.flags) &&
(lhs.use_hw_wrapped_key == rhs.use_hw_wrapped_key);
}
inline bool operator!=(const EncryptionOptions& lhs, const EncryptionOptions& rhs) {
return !(lhs == rhs);
}
inline bool operator==(const EncryptionPolicy& lhs, const EncryptionPolicy& rhs) {
return lhs.key_raw_ref == rhs.key_raw_ref && lhs.options == rhs.options;
}
inline bool operator!=(const EncryptionPolicy& lhs, const EncryptionPolicy& rhs) {
return !(lhs == rhs);
}
} // namespace fscrypt
} // namespace android
#endif // _FSCRYPT_H_
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