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Fully reduce sampled ternary vectors. #56

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Fully reduce sampled ternary vectors. #56

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c7b4e6d
Fully reduce sampled ternary vectors.
dfaranha Oct 12, 2022
8446d78
Extend NFLlib PRNG.
dfaranha Oct 13, 2022
b96c9fd
Replace PRNG with AES256 generator.
dfaranha Oct 14, 2022
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30 changes: 17 additions & 13 deletions include/nfl/core.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -243,7 +243,7 @@ void poly<T, Degree, NbModuli>::set(non_uniform const& mode) {
}
}
}
}
}
else
{
for (unsigned int i = 0; i < degree; i++) {
Expand Down Expand Up @@ -303,10 +303,10 @@ void poly<T, Degree, NbModuli>::set(gaussian<in_class, T, _lu_depth> const& mode
mode.fg_prng->getNoise((value_type *)rnd, degree);

if (amplifier != 1) for (unsigned int i = 0; i < degree; i++) rnd[i]*= amplifier;
for (size_t cm = 0; cm < nmoduli; cm++)
for (size_t cm = 0; cm < nmoduli; cm++)
{
for (size_t i = 0 ; i < degree; i++)
{
{
if(rnd[i]<0)
_data[degree*cm+i] = get_modulus(cm) + rnd[i];
else
Expand Down Expand Up @@ -338,8 +338,12 @@ void poly<T, Degree, NbModuli>::set(ZO_dist const& mode) {
for (size_t cm = 0; cm < NbModuli; ++cm) {
const T pm = params<T>::P[cm] - 1u;
/* sample {-1, 0, 1} */
for (size_t i = 0; i < Degree; ++i)
*ptr++ = rnd[i] <= mode.rho ? pm + (rnd[i] & 2) : 0u;
for (size_t i = 0; i < Degree; ++i, ptr++) {
*ptr = rnd[i] <= mode.rho ? (pm + (rnd[i] & 2)) : 0u;
if (*ptr > params<T>::P[cm]) {
*ptr -= params<T>::P[cm];
}
}
}
}

Expand All @@ -357,7 +361,7 @@ void poly<T, Degree, NbModuli>::set(hwt_dist const& mode) {
auto rnd_end = rnd.end();
auto rnd_ptr = rnd_end;
/* Reservoir Sampling: uniformly select hwt coefficients. */
for (size_t k = mode.hwt; k < degree; ++k)
for (size_t k = mode.hwt; k < degree; ++k)
{
size_t pos = 0;
size_t reject_sample = std::numeric_limits<size_t>::max() / k;
Expand All @@ -384,8 +388,10 @@ void poly<T, Degree, NbModuli>::set(hwt_dist const& mode) {
for (size_t cm = 0, offset = 0; cm < NbModuli; ++cm, offset += degree) {
const T pm = params<T>::P[cm] - 1u;
rnd_ptr = rnd.begin();
for (size_t pos : hitted)
_data[pos + offset] = pm + ((*rnd_ptr++) & 2U); // {-1, 1}
for (size_t pos : hitted) {
_data[pos + offset] = ((*rnd_ptr++) & 2U); // {-1, 1}
_data[pos + offset] = (_data[pos + offset] > 0 ? 1 : pm);
}
}
std::memset(hitted.data(), 0x0, hitted.size() * sizeof(size_t)); // erase from memory
}
Expand All @@ -400,9 +406,9 @@ std::ostream& operator<<(std::ostream& outs, poly<T, Degree, NbModuli> const& p)
{
bool first = true;
std::string term;
if (typeid(T) == typeid(uint64_t)) term = "ULL";
else if (typeid(T) == typeid(uint32_t)) term = "UL";
else term = "U";
if (typeid(T) == typeid(uint64_t)) term = "ULL";
else if (typeid(T) == typeid(uint32_t)) term = "UL";
else term = "U";

outs << "{ ";
for(auto v : p)
Expand Down Expand Up @@ -688,5 +694,3 @@ template<class T, size_t Degree, size_t NbModuli> void poly<T, Degree, NbModuli
}

#endif


2 changes: 2 additions & 0 deletions include/nfl/prng/fastrandombytes.h
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Original file line number Diff line number Diff line change
Expand Up @@ -8,6 +8,8 @@
#define FASTRANDOMBYTES_H

namespace nfl {
void fastrandombytes_seed(const unsigned char *s);
void fastrandombytes_reseed();
void fastrandombytes(unsigned char *r, unsigned long long rlen);
}

Expand Down
169 changes: 141 additions & 28 deletions lib/prng/fastrandombytes.cpp
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Original file line number Diff line number Diff line change
@@ -1,35 +1,148 @@
/*
* File: lattisigns512-20130329/fastrandombytes.c
* Author: Gim Güneysu, Tobias Oder, Thomas Pöppelmann, Peter Schwabe
* Public Domain
/* Adapted from Intel® Advanced Encryption Standard (Intel® AES) Instructions Set - Rev 3.01
* https://software.intel.com/sites/default/files/article/165683/aes-wp-2012-09-22-v01.pdf
*/

#include <inttypes.h>
#include <iostream>
#include "nfl/prng/crypto_stream_salsa20.h"
#include "nfl/prng/randombytes.h"
#include "fastrandombytes.h"
#include "randombytes.h"
#include <string.h>
#include <x86intrin.h>

namespace nfl {
static __m128i round_key[15];
static __m128i iv;
static const __m128i ONE = {1, 0};

#define AES256_KEY_LENGTH 32

static size_t constexpr crypto_stream_salsa20_KEYBYTES = 32;
static size_t constexpr crypto_stream_salsa20_NONCEBYTES = 8;
namespace nfl {

static int init = 0;
static unsigned char key[crypto_stream_salsa20_KEYBYTES];
static unsigned char nonce[crypto_stream_salsa20_NONCEBYTES] = {0};

void fastrandombytes(unsigned char *r, unsigned long long rlen) {
unsigned long long n = 0;
int i;
if (!init) {
randombytes(key, crypto_stream_salsa20_KEYBYTES);
init = 1;
}
nfl_crypto_stream_salsa20_amd64_xmm6(r, rlen, nonce, key);

// Increase 64-bit counter (nonce)
for (i = 0; i < crypto_stream_salsa20_NONCEBYTES; i++) n ^= ((unsigned long long)nonce[i]) << 8 * i;
n++;
for (i = 0; i < crypto_stream_salsa20_NONCEBYTES; i++) nonce[i] = (n >> 8 * i) & 0xff;

static inline void KEY_256_ASSIST_1(__m128i* temp1, __m128i * temp2)
{
__m128i temp4;
*temp2 = _mm_shuffle_epi32(*temp2, 0xff);
temp4 = _mm_slli_si128(*temp1, 0x4);
*temp1 = _mm_xor_si128(*temp1, temp4);
temp4 = _mm_slli_si128(temp4, 0x4);
*temp1 = _mm_xor_si128(*temp1, temp4);
temp4 = _mm_slli_si128(temp4, 0x4);
*temp1 = _mm_xor_si128(*temp1, temp4);
*temp1 = _mm_xor_si128(*temp1, *temp2);
}

static inline void KEY_256_ASSIST_2(__m128i* temp1, __m128i * temp3)
{
__m128i temp2,temp4;
temp4 = _mm_aeskeygenassist_si128(*temp1, 0x0);
temp2 = _mm_shuffle_epi32(temp4, 0xaa);
temp4 = _mm_slli_si128(*temp3, 0x4);
*temp3 = _mm_xor_si128(*temp3, temp4);
temp4 = _mm_slli_si128(temp4, 0x4);
*temp3 = _mm_xor_si128(*temp3, temp4);
temp4 = _mm_slli_si128(temp4, 0x4);
*temp3 = _mm_xor_si128(*temp3, temp4);
*temp3 = _mm_xor_si128(*temp3, temp2);
}

/* round_key <-- aes256_key_expansion(randomness), iv <-- 0 */
void fastrandombytes_seed(const unsigned char *randomness)
{
__m128i temp1, temp2, temp3;

temp1 = _mm_loadu_si128((__m128i*)randomness);
temp3 = _mm_loadu_si128((__m128i*)(randomness+16));
round_key[0] = temp1;
round_key[1] = temp3;
temp2 = _mm_aeskeygenassist_si128(temp3,0x01);
KEY_256_ASSIST_1(&temp1, &temp2);
round_key[2]=temp1;
KEY_256_ASSIST_2(&temp1, &temp3);
round_key[3]=temp3;
temp2 = _mm_aeskeygenassist_si128(temp3,0x02);
KEY_256_ASSIST_1(&temp1, &temp2);
round_key[4]=temp1;
KEY_256_ASSIST_2(&temp1, &temp3);
round_key[5]=temp3;
temp2 = _mm_aeskeygenassist_si128(temp3,0x04);
KEY_256_ASSIST_1(&temp1, &temp2);
round_key[6]=temp1;
KEY_256_ASSIST_2(&temp1, &temp3);
round_key[7]=temp3;
temp2 = _mm_aeskeygenassist_si128(temp3,0x08);
KEY_256_ASSIST_1(&temp1, &temp2);
round_key[8]=temp1;
KEY_256_ASSIST_2(&temp1, &temp3);
round_key[9]=temp3;
temp2 = _mm_aeskeygenassist_si128(temp3,0x10);
KEY_256_ASSIST_1(&temp1, &temp2);
round_key[10]=temp1;
KEY_256_ASSIST_2(&temp1, &temp3);
round_key[11]=temp3;
temp2 = _mm_aeskeygenassist_si128(temp3,0x20);
KEY_256_ASSIST_1(&temp1, &temp2);
round_key[12]=temp1;
KEY_256_ASSIST_2(&temp1, &temp3);
round_key[13]=temp3;
temp2 = _mm_aeskeygenassist_si128(temp3,0x40);
KEY_256_ASSIST_1(&temp1, &temp2);
round_key[14]=temp1;

iv = _mm_setzero_si128();
init = -1;
}

void fastrandombytes_reseed() {
init = 0;
}

static inline void AES_ctr_round(unsigned char *out)
{
__m128i tmp;

tmp = _mm_xor_si128(iv,round_key[0]);
tmp = _mm_aesenc_si128(tmp,round_key[1]);
tmp = _mm_aesenc_si128(tmp,round_key[2]);
tmp = _mm_aesenc_si128(tmp,round_key[3]);
tmp = _mm_aesenc_si128(tmp,round_key[4]);
tmp = _mm_aesenc_si128(tmp,round_key[5]);
tmp = _mm_aesenc_si128(tmp,round_key[6]);
tmp = _mm_aesenc_si128(tmp,round_key[7]);
tmp = _mm_aesenc_si128(tmp,round_key[8]);
tmp = _mm_aesenc_si128(tmp,round_key[9]);
tmp = _mm_aesenc_si128(tmp,round_key[10]);
tmp = _mm_aesenc_si128(tmp,round_key[11]);
tmp = _mm_aesenc_si128(tmp,round_key[12]);
tmp = _mm_aesenc_si128(tmp,round_key[13]);
tmp = _mm_aesenclast_si128(tmp,round_key[14]);
_mm_storeu_si128((__m128i*)out,tmp);

iv = _mm_add_epi32(iv, ONE);
}

/* r <-- aes256_ctr(round_key, iv, rlen) */
void fastrandombytes(unsigned char *r, unsigned long long rlen)
{
unsigned char ct[16];
unsigned long long num_of_blocks = rlen >> 4;
unsigned long long i;

if (!init) {
unsigned char seed[AES256_KEY_LENGTH];
randombytes(seed, AES256_KEY_LENGTH);
fastrandombytes_seed(seed);
init = 1;
}

for (i = 0; i < num_of_blocks; i++)
{
AES_ctr_round(r + (i << 4));
}

if (rlen & 0x0f)
{
AES_ctr_round(ct);

memcpy(r + (i << 4), ct, rlen & 0x0f);
}
}
}
}
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