duoram/prg_lowmc_impl.h

/* Copyright (C) 2019  Anonymous
 *
 * This is a pre-release version of the DPF++ library distributed anonymously
 * for peer review. A public release of the software will be published under the
 * LPGL v2.1 license in the near future. Please do not redistribute this version
 * of the software.
 */

#ifndef DPFPP_PRG_LOWMC_IMPL_H__
#define DPFPP_PRG_LOWMC_IMPL_H__

#include "prg.h"
#include "../lowmc/lowmc.h"

namespace dpf
{

template <typename lowmc>
inline void PRG(const lowmc & prgkey, const __m128i & seed, void * outbuf, const uint32_t len, const uint32_t from = 0)
{
	using block_t = typename lowmc::block_t;
	block_t * outbuf128 = reinterpret_cast<block_t*>(outbuf);
	//printf(" seed = %llu <-> %llu\n", seed[0], seed[1]);
	for (size_t i = 0; i < len; ++i)
	{
		auto tmp = _mm_xor_si128(seed, _mm_set_epi64x(0, from+i));
		outbuf128[i] = prgkey.encrypt(tmp);
		outbuf128[i] = _mm_xor_si128(outbuf128[i], tmp);
	}
}

template<typename lowmc>
inline std::ostream & operator<<(std::ostream & os, const lowmc & prgkey)
{
	auto zero = _mm_setzero_si128();
	return os.write(reinterpret_cast<const char *>(&zero), sizeof(__m128i));
}

} // namespace dpf

#endif // DPFPP_PRG_LOWMC_IMPL_H