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// AesCfb128Decryptor.cpp
// Implements the cAesCfb128Decryptor class decrypting data using AES CFB-128
#include "Globals.h"
#include "AesCfb128Decryptor.h"
cAesCfb128Decryptor::cAesCfb128Decryptor(void):
m_IsValid(false)
{
mbedtls_aes_init(&m_Aes);
}
cAesCfb128Decryptor::~cAesCfb128Decryptor()
{
// Clear the leftover in-memory data, so that they can't be accessed by a backdoor
mbedtls_aes_free(&m_Aes);
}
void cAesCfb128Decryptor::Init(const Byte a_Key[16], const Byte a_IV[16])
{
ASSERT(!IsValid()); // Cannot Init twice
memcpy(m_IV, a_IV, 16);
mbedtls_aes_setkey_enc(&m_Aes, a_Key, 128);
m_IsValid = true;
}
void cAesCfb128Decryptor::ProcessData(std::byte * a_DecryptedOut, const Byte * a_EncryptedIn, size_t a_Length)
{
ASSERT(IsValid()); // Must Init() first
mbedtls_aes_crypt_cfb8(&m_Aes, MBEDTLS_AES_DECRYPT, a_Length, m_IV, a_EncryptedIn, reinterpret_cast<unsigned char *>(a_DecryptedOut));
}
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