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// CtrDrbgContext.h
// Declares the cCtrDrbgContext class representing a wrapper over CTR-DRBG implementation in mbedTLS
#pragma once
#include "mbedtls/ctr_drbg.h"
// fwd: EntropyContext.h
class cEntropyContext;
class cCtrDrbgContext
{
friend class cSslConfig;
friend class cRsaPrivateKey;
friend class cCryptoKey;
public:
/** Constructs the context with a new entropy context. */
cCtrDrbgContext(void);
/** Constructs the context with the specified entropy context. */
cCtrDrbgContext(const std::shared_ptr<cEntropyContext> & a_EntropyContext);
/** Initializes the context.
a_Custom is optional additional data to use for entropy, nullptr is accepted.
Returns 0 if successful, mbedTLS error code on failure. */
int Initialize(const void * a_Custom, size_t a_CustomSize);
/** Returns true if the object is valid (has been initialized properly) */
bool IsValid(void) const { return m_IsValid; }
protected:
/** The entropy source used for generating the random */
std::shared_ptr<cEntropyContext> m_EntropyContext;
/** The random generator context */
mbedtls_ctr_drbg_context m_CtrDrbg;
/** Set to true if the object is valid (has been initialized properly) */
bool m_IsValid;
/** Returns the internal context ptr. Only use in mbedTLS API calls. */
mbedtls_ctr_drbg_context * GetInternal(void) { return &m_CtrDrbg; }
} ;
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