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