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/**
* Copyright (C) 2019-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#pragma once
#include <MurmurHash3.h>
#include <cstdint>
#include <memory>
#include "mongo/base/secure_allocator.h"
#include "mongo/platform/atomic_word.h"
namespace mongo {
class Status;
class SymmetricKeyId {
public:
using id_type = std::uint64_t;
template <typename StringLike>
SymmetricKeyId(const StringLike& name, id_type id)
: _id(id), _name(name), _strRep(_initStrRep()) {}
template <typename StringLike>
SymmetricKeyId(const StringLike& name) : _name(name) {}
const std::string& toString() const;
bool operator==(const SymmetricKeyId& other) const {
return _id == other._id && _name == other._name;
}
bool operator!=(const SymmetricKeyId& other) const {
return !(*this == other);
}
const boost::optional<id_type>& id() const {
return _id;
}
const std::string& name() const {
return _name;
}
/**
* Custom hash function so that SymmetricKeyId can be used by ESE's LRUCache.
*/
struct Hash {
std::size_t operator()(const SymmetricKeyId& keyid) const {
auto rep = keyid.toString();
uint32_t hash;
MurmurHash3_x86_32(rep.data(), rep.size(), 0, &hash);
return hash;
}
};
private:
std::string _initStrRep() const;
boost::optional<id_type> _id;
std::string _name;
std::string _strRep;
};
/**
* Class representing a symmetric key
*/
class SymmetricKey {
SymmetricKey(const SymmetricKey&) = delete;
SymmetricKey& operator=(const SymmetricKey&) = delete;
public:
SymmetricKey(const uint8_t* key,
size_t keySize,
uint32_t algorithm,
SymmetricKeyId keyId,
uint32_t initializationCount);
SymmetricKey(SecureVector<uint8_t> key, uint32_t algorithm, SymmetricKeyId keyId);
SymmetricKey(SymmetricKey&&);
SymmetricKey& operator=(SymmetricKey&&);
~SymmetricKey() = default;
int getAlgorithm() const {
return _algorithm;
}
size_t getKeySize() const {
return _keySize;
}
// Return the number of times the key has been retrieved from the key store
uint32_t getInitializationCount() const {
return _initializationCount;
}
uint32_t incrementAndGetInitializationCount() {
_initializationCount++;
return _initializationCount;
}
uint64_t getAndIncrementInvocationCount() const {
return _invocationCount.fetchAndAdd(1);
}
const uint8_t* getKey() const {
return _key->data();
}
const SymmetricKeyId& getKeyId() const {
return _keyId;
}
void setKeyId(SymmetricKeyId keyId) {
_keyId = std::move(keyId);
}
private:
int _algorithm;
size_t _keySize;
SecureVector<uint8_t> _key;
SymmetricKeyId _keyId;
uint32_t _initializationCount;
mutable AtomicWord<unsigned long long> _invocationCount;
};
using UniqueSymmetricKey = std::unique_ptr<SymmetricKey>;
} // namespace mongo
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