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https://github.com/DarkStore-3DS/Project_CTR.git
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jakcron
102 lines
2.4 KiB
C++
102 lines
2.4 KiB
C++
/**
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* @file AesImpl.h
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* @brief Declaration of tc::crypto::detail::AesImpl
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* @author Jack (jakcron)
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* @version 0.1
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* @date 2020/07/04
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**/
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#pragma once
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#include <tc/types.h>
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#include <tc/ArgumentNullException.h>
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#include <tc/ArgumentOutOfRangeException.h>
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namespace tc { namespace crypto { namespace detail {
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/**
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* @class AesImpl
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* @brief This class implements the AES block encryption algorithm.
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*/
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class AesImpl
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{
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public:
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static const size_t kBlockSize = 16; /**< AES processing block size. */
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/**
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* @brief Default constructor.
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*
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* @post
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* - State is None. @ref initialize() must be called before use.
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*/
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AesImpl();
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~AesImpl();
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/**
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* @brief Initialize AES state with key.
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*
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* @param[in] key Pointer to key data.
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* @param[in] key_size Size in bytes of key data.
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*
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* @pre
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* - @p key_size must be 16, 24 or 32.
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* @post
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* - Instance is now in initialized state.
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*
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* @throw tc::ArgumentNullException @p key was null.
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* @throw tc::ArgumentOutOfRangeException @p key_size did not equal 16, 24 or 32.
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*/
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void initialize(const byte_t* key, size_t key_size);
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/**
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* @brief Encrypt data block.
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*
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* @param[out] dst Buffer to store encrypted block.
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* @param[in] src Pointer to block to encrypt.
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*
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* @pre
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* - Instance is in initialized state.
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*
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* @details
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* This encrypts @ref kBlockSize number of bytes of data from @p src, writing it to @p dst.
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*
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* @note
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* - @p dst and @p src can be the same pointer.
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*
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* @throw tc::ArgumentNullException @p dst was null.
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* @throw tc::ArgumentNullException @p src was null.
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*/
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void encrypt(byte_t* dst, const byte_t* src);
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/**
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* @brief Decrypt data block.
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*
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* @param[out] dst Buffer to store decrypted block.
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* @param[in] src Pointer to block to decrypt.
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*
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* @pre
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* - Instance is in initialized state.
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*
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* @details
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* This decrypts @ref kBlockSize number of bytes of data from @p src, writing it to @p dst.
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*
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* @note
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* - @p dst and @p src can be the same pointer.
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*
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* @throw tc::ArgumentNullException @p dst was null.
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* @throw tc::ArgumentNullException @p src was null.
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*/
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void decrypt(byte_t* dst, const byte_t* src);
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private:
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enum class State
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{
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None,
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Initialized
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};
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State mState;
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struct ImplCtx;
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std::unique_ptr<ImplCtx> mImplCtx;
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};
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}}} // namespace tc::crypto::detail
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