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// CtrDrbgContext.cpp
// Implements the cCtrDrbgContext class representing a wrapper over CTR-DRBG implementation in mbedTLS
#include "Globals.h"
#include "CtrDrbgContext.h"
#include "EntropyContext.h"
cCtrDrbgContext::cCtrDrbgContext(void) :
m_EntropyContext(std::make_shared<cEntropyContext>()),
m_IsValid(false)
{
mbedtls_ctr_drbg_init(&m_CtrDrbg);
}
cCtrDrbgContext::cCtrDrbgContext(const std::shared_ptr<cEntropyContext> & a_EntropyContext) :
m_EntropyContext(a_EntropyContext),
m_IsValid(false)
{
mbedtls_ctr_drbg_init(&m_CtrDrbg);
}
int cCtrDrbgContext::Initialize(const void * a_Custom, size_t a_CustomSize)
{
if (m_IsValid)
{
// Already initialized
return 0;
}
int res = mbedtls_ctr_drbg_seed(&m_CtrDrbg, mbedtls_entropy_func, &(m_EntropyContext->m_Entropy), static_cast<const unsigned char *>(a_Custom), a_CustomSize);
m_IsValid = (res == 0);
return res;
}
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