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jakcron
61 lines
1.3 KiB
C++
61 lines
1.3 KiB
C++
/**
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* @file PrbgImpl.h
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* @brief Declaration of tc::crypto::detail::PrbgImpl
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* @author Jack (jakcron)
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* @version 0.1
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* @date 2020/06/12
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**/
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#pragma once
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#include <tc/types.h>
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#include <tc/crypto/CryptoException.h>
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namespace tc { namespace crypto { namespace detail {
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/**
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* @class PrbgImpl
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* @brief This class implements a Psuedo Random Byte Generator.
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*
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* @details
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* The underlying algorithm is CTR_DBRG.
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* This class generates random data suitable for encryption use cases.
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* - Initialization vectors
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* - Salts / Nonces
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* - HMAC keys
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* - AES keys
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*/
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class PrbgImpl
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{
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public:
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/**
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* @brief Default constructor
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* @details
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* This initializes random number generator state
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*/
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PrbgImpl();
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/**
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* @brief Destructor
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* @details
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* Cleans up random number generator state
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*/
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~PrbgImpl();
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/**
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* @brief Populate array with random data.
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*
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* @param[out] data Buffer to hold random data.
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* @param[in] data_size Size of @p data buffer.
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*
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* @throw tc::crypto::CryptoException An unexpected error has occurred.
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* @throw tc::crypto::CryptoException Request too big.
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*/
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void getBytes(byte_t* data, size_t data_size);
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private:
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static const std::string kClassName;
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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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