mirror of
https://github.com/Tencent/MMKV.git
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guoling
108 lines
2.6 KiB
C++
108 lines
2.6 KiB
C++
/*
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* Tencent is pleased to support the open source community by making
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* MMKV available.
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*
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* Copyright (C) 2018 THL A29 Limited, a Tencent company.
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* All rights reserved.
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*
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* Licensed under the BSD 3-Clause License (the "License"); you may not use
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* this file except in compliance with the License. You may obtain a copy of
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* the License at
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*
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* https://opensource.org/licenses/BSD-3-Clause
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef AES_CRYPT_H_
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#define AES_CRYPT_H_
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#ifdef __cplusplus
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#include "MMKVPredef.h"
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#include <cstddef>
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#ifdef MMKV_DISABLE_CRYPT
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namespace mmkv {
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class AESCrypt;
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}
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#else
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namespace openssl {
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struct AES_KEY;
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}
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namespace mmkv {
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#pragma pack(push, 1)
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struct AESCryptStatus {
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uint8_t m_number;
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uint8_t m_vector[AES_KEY_LEN];
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};
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#pragma pack(pop)
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class CodedInputDataCrypt;
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// a AES CFB-128 encrypt-decrypt full-duplex wrapper
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class AESCrypt {
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bool m_isClone = false;
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uint32_t m_number = 0;
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openssl::AES_KEY *m_aesKey = nullptr;
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openssl::AES_KEY *m_aesRollbackKey = nullptr;
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uint8_t m_key[AES_KEY_LEN] = {};
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public:
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uint8_t m_vector[AES_KEY_LEN] = {};
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private:
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// for cloneWithStatus()
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AESCrypt(const AESCrypt &other, const AESCryptStatus &status);
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public:
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AESCrypt(const void *key, size_t keyLength, const void *iv = nullptr, size_t ivLength = 0);
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AESCrypt(AESCrypt &&other) = default;
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~AESCrypt();
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void encrypt(const void *input, void *output, size_t length);
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void decrypt(const void *input, void *output, size_t length);
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void getCurStatus(AESCryptStatus &status);
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void statusBeforeDecrypt(const void *input, const void *output, size_t length, AESCryptStatus &status);
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AESCrypt cloneWithStatus(const AESCryptStatus &status) const;
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void resetIV(const void *iv = nullptr, size_t ivLength = 0);
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void resetStatus(const AESCryptStatus &status);
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// output must have [AES_KEY_LEN] space
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void getKey(void *output) const;
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static void fillRandomIV(void *vector);
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// just forbid it for possibly misuse
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explicit AESCrypt(const AESCrypt &other) = delete;
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AESCrypt &operator=(const AESCrypt &other) = delete;
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friend CodedInputDataCrypt;
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#ifndef NDEBUG
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// check if AESCrypt is encrypt-decrypt full-duplex
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static void testAESCrypt();
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#endif
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};
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} // namespace mmkv
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#endif // MMKV_DISABLE_CRYPT
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#endif // __cplusplus
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#endif /* AES_CRYPT_H_ */
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