AesCfb128Encryptor.cpp

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// AesCfb128Encryptor.cpp
 
// Implements the cAesCfb128Encryptor class encrypting data using AES CFB-128
 
#include "Globals.h"
#include "AesCfb128Encryptor.h"
 
 
 
 
 
cAesCfb128Encryptor::cAesCfb128Encryptor(void):
    m_IsValid(false)
{
    mbedtls_aes_init(&m_Aes);
}
 
 
 
 
 
cAesCfb128Encryptor::~cAesCfb128Encryptor()
{
    // Clear the leftover in-memory data, so that they can't be accessed by a backdoor
    mbedtls_aes_free(&m_Aes);
}
 
 
 
 
 
void cAesCfb128Encryptor::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 cAesCfb128Encryptor::ProcessData(std::byte * const a_PlainIn, const size_t a_Length)
{
    ASSERT(IsValid());  // Must Init() first
    mbedtls_aes_crypt_cfb8(&m_Aes, MBEDTLS_AES_ENCRYPT, a_Length, m_IV, reinterpret_cast<const unsigned char *>(a_PlainIn), reinterpret_cast<unsigned char *>(a_PlainIn));
}