CtrDrbgContext.cpp

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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;
}