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yescrypt-sse.c
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yescrypt-sse.c
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/*-
* Copyright 2009 Colin Percival
* Copyright 2012-2014 Alexander Peslyak
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* This file was originally written by Colin Percival as part of the Tarsnap
* online backup system.
*/
/*
* On 64-bit, enabling SSE4.1 helps our pwxform code indirectly, via avoiding
* gcc bug 54349 (fixed for gcc 4.9+). On 32-bit, it's of direct help. AVX
* and XOP are of further help either way.
*/
#ifndef __SSE4_1__
#warning "Consider enabling SSE4.1, AVX, or XOP in the C compiler for significantly better performance"
#endif
#include <emmintrin.h>
#ifdef __XOP__
#include <x86intrin.h>
#endif
#include <errno.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include "sha256.h"
#include "sysendian.h"
#include "yescrypt.h"
#include "yescrypt-platform.c"
#if __STDC_VERSION__ >= 199901L
/* have restrict */
#elif defined(__GNUC__)
#define restrict __restrict
#else
#define restrict
#endif
#define PREFETCH(x, hint) _mm_prefetch((const char *)(x), (hint));
#define PREFETCH_OUT(x, hint) /* disabled */
#ifdef __XOP__
#define ARX(out, in1, in2, s) \
out = _mm_xor_si128(out, _mm_roti_epi32(_mm_add_epi32(in1, in2), s));
#else
#define ARX(out, in1, in2, s) \
{ \
__m128i T = _mm_add_epi32(in1, in2); \
out = _mm_xor_si128(out, _mm_slli_epi32(T, s)); \
out = _mm_xor_si128(out, _mm_srli_epi32(T, 32-s)); \
}
#endif
#define SALSA20_2ROUNDS \
/* Operate on "columns" */ \
ARX(X1, X0, X3, 7) \
ARX(X2, X1, X0, 9) \
ARX(X3, X2, X1, 13) \
ARX(X0, X3, X2, 18) \
\
/* Rearrange data */ \
X1 = _mm_shuffle_epi32(X1, 0x93); \
X2 = _mm_shuffle_epi32(X2, 0x4E); \
X3 = _mm_shuffle_epi32(X3, 0x39); \
\
/* Operate on "rows" */ \
ARX(X3, X0, X1, 7) \
ARX(X2, X3, X0, 9) \
ARX(X1, X2, X3, 13) \
ARX(X0, X1, X2, 18) \
\
/* Rearrange data */ \
X1 = _mm_shuffle_epi32(X1, 0x39); \
X2 = _mm_shuffle_epi32(X2, 0x4E); \
X3 = _mm_shuffle_epi32(X3, 0x93);
/**
* Apply the salsa20/8 core to the block provided in (X0 ... X3).
*/
#define SALSA20_8_BASE(maybe_decl, out) \
{ \
maybe_decl Y0 = X0; \
maybe_decl Y1 = X1; \
maybe_decl Y2 = X2; \
maybe_decl Y3 = X3; \
SALSA20_2ROUNDS \
SALSA20_2ROUNDS \
SALSA20_2ROUNDS \
SALSA20_2ROUNDS \
(out)[0] = X0 = _mm_add_epi32(X0, Y0); \
(out)[1] = X1 = _mm_add_epi32(X1, Y1); \
(out)[2] = X2 = _mm_add_epi32(X2, Y2); \
(out)[3] = X3 = _mm_add_epi32(X3, Y3); \
}
#define SALSA20_8(out) \
SALSA20_8_BASE(__m128i, out)
/**
* Apply the salsa20/8 core to the block provided in (X0 ... X3) ^ (Z0 ... Z3).
*/
#define SALSA20_8_XOR_ANY(maybe_decl, Z0, Z1, Z2, Z3, out) \
X0 = _mm_xor_si128(X0, Z0); \
X1 = _mm_xor_si128(X1, Z1); \
X2 = _mm_xor_si128(X2, Z2); \
X3 = _mm_xor_si128(X3, Z3); \
SALSA20_8_BASE(maybe_decl, out)
#define SALSA20_8_XOR_MEM(in, out) \
SALSA20_8_XOR_ANY(__m128i, (in)[0], (in)[1], (in)[2], (in)[3], out)
#define SALSA20_8_XOR_REG(out) \
SALSA20_8_XOR_ANY(/* empty */, Y0, Y1, Y2, Y3, out)
typedef union {
uint32_t w[16];
__m128i q[4];
} salsa20_blk_t;
/**
* blockmix_salsa8(Bin, Bout, r):
* Compute Bout = BlockMix_{salsa20/8, r}(Bin). The input Bin must be 128r
* bytes in length; the output Bout must also be the same size.
*/
static inline void
blockmix_salsa8(const salsa20_blk_t *restrict Bin,
salsa20_blk_t *restrict Bout, size_t r)
{
__m128i X0, X1, X2, X3;
size_t i;
r--;
PREFETCH(&Bin[r * 2 + 1], _MM_HINT_T0)
for (i = 0; i < r; i++) {
PREFETCH(&Bin[i * 2], _MM_HINT_T0)
PREFETCH_OUT(&Bout[i], _MM_HINT_T0)
PREFETCH(&Bin[i * 2 + 1], _MM_HINT_T0)
PREFETCH_OUT(&Bout[r + 1 + i], _MM_HINT_T0)
}
PREFETCH(&Bin[r * 2], _MM_HINT_T0)
PREFETCH_OUT(&Bout[r], _MM_HINT_T0)
PREFETCH_OUT(&Bout[r * 2 + 1], _MM_HINT_T0)
/* 1: X <-- B_{2r - 1} */
X0 = Bin[r * 2 + 1].q[0];
X1 = Bin[r * 2 + 1].q[1];
X2 = Bin[r * 2 + 1].q[2];
X3 = Bin[r * 2 + 1].q[3];
/* 3: X <-- H(X \xor B_i) */
/* 4: Y_i <-- X */
/* 6: B' <-- (Y_0, Y_2 ... Y_{2r-2}, Y_1, Y_3 ... Y_{2r-1}) */
SALSA20_8_XOR_MEM(Bin[0].q, Bout[0].q)
/* 2: for i = 0 to 2r - 1 do */
for (i = 0; i < r;) {
/* 3: X <-- H(X \xor B_i) */
/* 4: Y_i <-- X */
/* 6: B' <-- (Y_0, Y_2 ... Y_{2r-2}, Y_1, Y_3 ... Y_{2r-1}) */
SALSA20_8_XOR_MEM(Bin[i * 2 + 1].q, Bout[r + 1 + i].q)
i++;
/* 3: X <-- H(X \xor B_i) */
/* 4: Y_i <-- X */
/* 6: B' <-- (Y_0, Y_2 ... Y_{2r-2}, Y_1, Y_3 ... Y_{2r-1}) */
SALSA20_8_XOR_MEM(Bin[i * 2].q, Bout[i].q)
}
/* 3: X <-- H(X \xor B_i) */
/* 4: Y_i <-- X */
/* 6: B' <-- (Y_0, Y_2 ... Y_{2r-2}, Y_1, Y_3 ... Y_{2r-1}) */
SALSA20_8_XOR_MEM(Bin[r * 2 + 1].q, Bout[r * 2 + 1].q)
}
/*
* (V)PSRLDQ and (V)PSHUFD have higher throughput than (V)PSRLQ on some CPUs
* starting with Sandy Bridge. Additionally, PSHUFD uses separate source and
* destination registers, whereas the shifts would require an extra move
* instruction for our code when building without AVX. Unfortunately, PSHUFD
* is much slower on Conroe (4 cycles latency vs. 1 cycle latency for PSRLQ)
* and somewhat slower on some non-Intel CPUs (luckily not including AMD
* Bulldozer and Piledriver). Since for many other CPUs using (V)PSHUFD is a
* win in terms of throughput or/and not needing a move instruction, we
* currently use it despite of the higher latency on some older CPUs. As an
* alternative, the #if below may be patched to only enable use of (V)PSHUFD
* when building with SSE4.1 or newer, which is not available on older CPUs
* where this instruction has higher latency.
*/
#if 1
#define HI32(X) \
_mm_shuffle_epi32((X), _MM_SHUFFLE(2,3,0,1))
#elif 0
#define HI32(X) \
_mm_srli_si128((X), 4)
#else
#define HI32(X) \
_mm_srli_epi64((X), 32)
#endif
#if defined(__x86_64__) && (defined(__ICC) || defined(__llvm__))
/* Intel's name, also supported by recent gcc */
#define EXTRACT64(X) _mm_cvtsi128_si64(X)
#elif defined(__x86_64__) && !defined(_MSC_VER) && !defined(__OPEN64__)
/* gcc got the 'x' name earlier than non-'x', MSVC and Open64 had bugs */
#define EXTRACT64(X) _mm_cvtsi128_si64x(X)
#elif defined(__x86_64__) && defined(__SSE4_1__)
/* No known bugs for this intrinsic */
#include <smmintrin.h>
#define EXTRACT64(X) _mm_extract_epi64((X), 0)
#elif defined(__SSE4_1__)
/* 32-bit */
#include <smmintrin.h>
#if 0
/* This is currently unused by the code below, which instead uses these two
* intrinsics explicitly when (!defined(__x86_64__) && defined(__SSE4_1__)) */
#define EXTRACT64(X) \
((uint64_t)(uint32_t)_mm_cvtsi128_si32(X) | \
((uint64_t)(uint32_t)_mm_extract_epi32((X), 1) << 32))
#endif
#else
/* 32-bit or compilers with known past bugs in _mm_cvtsi128_si64*() */
#define EXTRACT64(X) \
((uint64_t)(uint32_t)_mm_cvtsi128_si32(X) | \
((uint64_t)(uint32_t)_mm_cvtsi128_si32(HI32(X)) << 32))
#endif
/* This is tunable */
#define S_BITS 8
/* Not tunable in this implementation, hard-coded in a few places */
#define S_SIMD 2
#define S_P 4
/* Number of S-boxes. Not tunable by design, hard-coded in a few places. */
#define S_N 2
/* Derived values. Not tunable except via S_BITS above. */
#define S_SIZE1 (1 << S_BITS)
#define S_MASK ((S_SIZE1 - 1) * S_SIMD * 8)
#define S_MASK2 (((uint64_t)S_MASK << 32) | S_MASK)
#define S_SIZE_ALL (S_N * S_SIZE1 * S_SIMD * 8)
#if !defined(__x86_64__) && defined(__SSE4_1__)
/* 32-bit with SSE4.1 */
#define PWXFORM_X_T __m128i
#define PWXFORM_SIMD(X, x, s0, s1) \
x = _mm_and_si128(X, _mm_set1_epi64x(S_MASK2)); \
s0 = *(const __m128i *)(S0 + (uint32_t)_mm_cvtsi128_si32(x)); \
s1 = *(const __m128i *)(S1 + (uint32_t)_mm_extract_epi32(x, 1)); \
X = _mm_mul_epu32(HI32(X), X); \
X = _mm_add_epi64(X, s0); \
X = _mm_xor_si128(X, s1);
#else
/* 64-bit, or 32-bit without SSE4.1 */
#define PWXFORM_X_T uint64_t
#define PWXFORM_SIMD(X, x, s0, s1) \
x = EXTRACT64(X) & S_MASK2; \
s0 = *(const __m128i *)(S0 + (uint32_t)x); \
s1 = *(const __m128i *)(S1 + (x >> 32)); \
X = _mm_mul_epu32(HI32(X), X); \
X = _mm_add_epi64(X, s0); \
X = _mm_xor_si128(X, s1);
#endif
#define PWXFORM_ROUND \
PWXFORM_SIMD(X0, x0, s00, s01) \
PWXFORM_SIMD(X1, x1, s10, s11) \
PWXFORM_SIMD(X2, x2, s20, s21) \
PWXFORM_SIMD(X3, x3, s30, s31)
#define PWXFORM \
{ \
PWXFORM_X_T x0, x1, x2, x3; \
__m128i s00, s01, s10, s11, s20, s21, s30, s31; \
PWXFORM_ROUND PWXFORM_ROUND \
PWXFORM_ROUND PWXFORM_ROUND \
PWXFORM_ROUND PWXFORM_ROUND \
}
#define XOR4(in) \
X0 = _mm_xor_si128(X0, (in)[0]); \
X1 = _mm_xor_si128(X1, (in)[1]); \
X2 = _mm_xor_si128(X2, (in)[2]); \
X3 = _mm_xor_si128(X3, (in)[3]);
#define OUT(out) \
(out)[0] = X0; \
(out)[1] = X1; \
(out)[2] = X2; \
(out)[3] = X3;
/**
* blockmix_pwxform(Bin, Bout, r, S):
* Compute Bout = BlockMix_pwxform{salsa20/8, r, S}(Bin). The input Bin must
* be 128r bytes in length; the output Bout must also be the same size.
*/
static void
blockmix(const salsa20_blk_t *restrict Bin, salsa20_blk_t *restrict Bout,
size_t r, const __m128i *restrict S)
{
const uint8_t * S0, * S1;
__m128i X0, X1, X2, X3;
size_t i;
if (!S) {
blockmix_salsa8(Bin, Bout, r);
return;
}
S0 = (const uint8_t *)S;
S1 = (const uint8_t *)S + S_SIZE_ALL / 2;
/* Convert 128-byte blocks to 64-byte blocks */
r *= 2;
r--;
PREFETCH(&Bin[r], _MM_HINT_T0)
for (i = 0; i < r; i++) {
PREFETCH(&Bin[i], _MM_HINT_T0)
PREFETCH_OUT(&Bout[i], _MM_HINT_T0)
}
PREFETCH_OUT(&Bout[r], _MM_HINT_T0)
/* X <-- B_{r1 - 1} */
X0 = Bin[r].q[0];
X1 = Bin[r].q[1];
X2 = Bin[r].q[2];
X3 = Bin[r].q[3];
/* for i = 0 to r1 - 1 do */
for (i = 0; i < r; i++) {
/* X <-- H'(X \xor B_i) */
XOR4(Bin[i].q)
PWXFORM
/* B'_i <-- X */
OUT(Bout[i].q)
}
/* Last iteration of the loop above */
XOR4(Bin[i].q)
PWXFORM
/* B'_i <-- H(B'_i) */
SALSA20_8(Bout[i].q)
}
#define XOR4_2(in1, in2) \
X0 = _mm_xor_si128((in1)[0], (in2)[0]); \
X1 = _mm_xor_si128((in1)[1], (in2)[1]); \
X2 = _mm_xor_si128((in1)[2], (in2)[2]); \
X3 = _mm_xor_si128((in1)[3], (in2)[3]);
static inline uint32_t
blockmix_salsa8_xor(const salsa20_blk_t *restrict Bin1,
const salsa20_blk_t *restrict Bin2, salsa20_blk_t *restrict Bout,
size_t r, int Bin2_in_ROM)
{
__m128i X0, X1, X2, X3;
size_t i;
r--;
if (Bin2_in_ROM) {
PREFETCH(&Bin2[r * 2 + 1], _MM_HINT_NTA)
PREFETCH(&Bin1[r * 2 + 1], _MM_HINT_T0)
for (i = 0; i < r; i++) {
PREFETCH(&Bin2[i * 2], _MM_HINT_NTA)
PREFETCH(&Bin1[i * 2], _MM_HINT_T0)
PREFETCH(&Bin2[i * 2 + 1], _MM_HINT_NTA)
PREFETCH(&Bin1[i * 2 + 1], _MM_HINT_T0)
PREFETCH_OUT(&Bout[i], _MM_HINT_T0)
PREFETCH_OUT(&Bout[r + 1 + i], _MM_HINT_T0)
}
PREFETCH(&Bin2[r * 2], _MM_HINT_T0)
} else {
PREFETCH(&Bin2[r * 2 + 1], _MM_HINT_T0)
PREFETCH(&Bin1[r * 2 + 1], _MM_HINT_T0)
for (i = 0; i < r; i++) {
PREFETCH(&Bin2[i * 2], _MM_HINT_T0)
PREFETCH(&Bin1[i * 2], _MM_HINT_T0)
PREFETCH(&Bin2[i * 2 + 1], _MM_HINT_T0)
PREFETCH(&Bin1[i * 2 + 1], _MM_HINT_T0)
PREFETCH_OUT(&Bout[i], _MM_HINT_T0)
PREFETCH_OUT(&Bout[r + 1 + i], _MM_HINT_T0)
}
PREFETCH(&Bin2[r * 2], _MM_HINT_T0)
}
PREFETCH(&Bin1[r * 2], _MM_HINT_T0)
PREFETCH_OUT(&Bout[r], _MM_HINT_T0)
PREFETCH_OUT(&Bout[r * 2 + 1], _MM_HINT_T0)
/* 1: X <-- B_{2r - 1} */
XOR4_2(Bin1[r * 2 + 1].q, Bin2[r * 2 + 1].q)
/* 3: X <-- H(X \xor B_i) */
/* 4: Y_i <-- X */
/* 6: B' <-- (Y_0, Y_2 ... Y_{2r-2}, Y_1, Y_3 ... Y_{2r-1}) */
XOR4(Bin1[0].q)
SALSA20_8_XOR_MEM(Bin2[0].q, Bout[0].q)
/* 2: for i = 0 to 2r - 1 do */
for (i = 0; i < r;) {
/* 3: X <-- H(X \xor B_i) */
/* 4: Y_i <-- X */
/* 6: B' <-- (Y_0, Y_2 ... Y_{2r-2}, Y_1, Y_3 ... Y_{2r-1}) */
XOR4(Bin1[i * 2 + 1].q)
SALSA20_8_XOR_MEM(Bin2[i * 2 + 1].q, Bout[r + 1 + i].q)
i++;
/* 3: X <-- H(X \xor B_i) */
/* 4: Y_i <-- X */
/* 6: B' <-- (Y_0, Y_2 ... Y_{2r-2}, Y_1, Y_3 ... Y_{2r-1}) */
XOR4(Bin1[i * 2].q)
SALSA20_8_XOR_MEM(Bin2[i * 2].q, Bout[i].q)
}
/* 3: X <-- H(X \xor B_i) */
/* 4: Y_i <-- X */
/* 6: B' <-- (Y_0, Y_2 ... Y_{2r-2}, Y_1, Y_3 ... Y_{2r-1}) */
XOR4(Bin1[r * 2 + 1].q)
SALSA20_8_XOR_MEM(Bin2[r * 2 + 1].q, Bout[r * 2 + 1].q)
return _mm_cvtsi128_si32(X0);
}
static uint32_t
blockmix_xor(const salsa20_blk_t *restrict Bin1,
const salsa20_blk_t *restrict Bin2, salsa20_blk_t *restrict Bout,
size_t r, int Bin2_in_ROM, const __m128i *restrict S)
{
const uint8_t * S0, * S1;
__m128i X0, X1, X2, X3;
size_t i;
if (!S)
return blockmix_salsa8_xor(Bin1, Bin2, Bout, r, Bin2_in_ROM);
S0 = (const uint8_t *)S;
S1 = (const uint8_t *)S + S_SIZE_ALL / 2;
/* Convert 128-byte blocks to 64-byte blocks */
r *= 2;
r--;
if (Bin2_in_ROM) {
PREFETCH(&Bin2[r], _MM_HINT_NTA)
PREFETCH(&Bin1[r], _MM_HINT_T0)
for (i = 0; i < r; i++) {
PREFETCH(&Bin2[i], _MM_HINT_NTA)
PREFETCH(&Bin1[i], _MM_HINT_T0)
PREFETCH_OUT(&Bout[i], _MM_HINT_T0)
}
} else {
PREFETCH(&Bin2[r], _MM_HINT_T0)
PREFETCH(&Bin1[r], _MM_HINT_T0)
for (i = 0; i < r; i++) {
PREFETCH(&Bin2[i], _MM_HINT_T0)
PREFETCH(&Bin1[i], _MM_HINT_T0)
PREFETCH_OUT(&Bout[i], _MM_HINT_T0)
}
}
PREFETCH_OUT(&Bout[r], _MM_HINT_T0);
/* X <-- B_{r1 - 1} */
XOR4_2(Bin1[r].q, Bin2[r].q)
/* for i = 0 to r1 - 1 do */
for (i = 0; i < r; i++) {
/* X <-- H'(X \xor B_i) */
XOR4(Bin1[i].q)
XOR4(Bin2[i].q)
PWXFORM
/* B'_i <-- X */
OUT(Bout[i].q)
}
/* Last iteration of the loop above */
XOR4(Bin1[i].q)
XOR4(Bin2[i].q)
PWXFORM
/* B'_i <-- H(B'_i) */
SALSA20_8(Bout[i].q)
return _mm_cvtsi128_si32(X0);
}
#undef XOR4
#define XOR4(in, out) \
(out)[0] = Y0 = _mm_xor_si128((in)[0], (out)[0]); \
(out)[1] = Y1 = _mm_xor_si128((in)[1], (out)[1]); \
(out)[2] = Y2 = _mm_xor_si128((in)[2], (out)[2]); \
(out)[3] = Y3 = _mm_xor_si128((in)[3], (out)[3]);
static inline uint32_t
blockmix_salsa8_xor_save(const salsa20_blk_t *restrict Bin1,
salsa20_blk_t *restrict Bin2, salsa20_blk_t *restrict Bout,
size_t r)
{
__m128i X0, X1, X2, X3, Y0, Y1, Y2, Y3;
size_t i;
r--;
PREFETCH(&Bin2[r * 2 + 1], _MM_HINT_T0)
PREFETCH(&Bin1[r * 2 + 1], _MM_HINT_T0)
for (i = 0; i < r; i++) {
PREFETCH(&Bin2[i * 2], _MM_HINT_T0)
PREFETCH(&Bin1[i * 2], _MM_HINT_T0)
PREFETCH(&Bin2[i * 2 + 1], _MM_HINT_T0)
PREFETCH(&Bin1[i * 2 + 1], _MM_HINT_T0)
PREFETCH_OUT(&Bout[i], _MM_HINT_T0)
PREFETCH_OUT(&Bout[r + 1 + i], _MM_HINT_T0)
}
PREFETCH(&Bin2[r * 2], _MM_HINT_T0)
PREFETCH(&Bin1[r * 2], _MM_HINT_T0)
PREFETCH_OUT(&Bout[r], _MM_HINT_T0)
PREFETCH_OUT(&Bout[r * 2 + 1], _MM_HINT_T0)
/* 1: X <-- B_{2r - 1} */
XOR4_2(Bin1[r * 2 + 1].q, Bin2[r * 2 + 1].q)
/* 3: X <-- H(X \xor B_i) */
/* 4: Y_i <-- X */
/* 6: B' <-- (Y_0, Y_2 ... Y_{2r-2}, Y_1, Y_3 ... Y_{2r-1}) */
XOR4(Bin1[0].q, Bin2[0].q)
SALSA20_8_XOR_REG(Bout[0].q)
/* 2: for i = 0 to 2r - 1 do */
for (i = 0; i < r;) {
/* 3: X <-- H(X \xor B_i) */
/* 4: Y_i <-- X */
/* 6: B' <-- (Y_0, Y_2 ... Y_{2r-2}, Y_1, Y_3 ... Y_{2r-1}) */
XOR4(Bin1[i * 2 + 1].q, Bin2[i * 2 + 1].q)
SALSA20_8_XOR_REG(Bout[r + 1 + i].q)
i++;
/* 3: X <-- H(X \xor B_i) */
/* 4: Y_i <-- X */
/* 6: B' <-- (Y_0, Y_2 ... Y_{2r-2}, Y_1, Y_3 ... Y_{2r-1}) */
XOR4(Bin1[i * 2].q, Bin2[i * 2].q)
SALSA20_8_XOR_REG(Bout[i].q)
}
/* 3: X <-- H(X \xor B_i) */
/* 4: Y_i <-- X */
/* 6: B' <-- (Y_0, Y_2 ... Y_{2r-2}, Y_1, Y_3 ... Y_{2r-1}) */
XOR4(Bin1[r * 2 + 1].q, Bin2[r * 2 + 1].q)
SALSA20_8_XOR_REG(Bout[r * 2 + 1].q)
return _mm_cvtsi128_si32(X0);
}
#define XOR4_Y \
X0 = _mm_xor_si128(X0, Y0); \
X1 = _mm_xor_si128(X1, Y1); \
X2 = _mm_xor_si128(X2, Y2); \
X3 = _mm_xor_si128(X3, Y3);
static uint32_t
blockmix_xor_save(const salsa20_blk_t *restrict Bin1,
salsa20_blk_t *restrict Bin2, salsa20_blk_t *restrict Bout,
size_t r, const __m128i *restrict S)
{
const uint8_t * S0, * S1;
__m128i X0, X1, X2, X3, Y0, Y1, Y2, Y3;
size_t i;
if (!S)
return blockmix_salsa8_xor_save(Bin1, Bin2, Bout, r);
S0 = (const uint8_t *)S;
S1 = (const uint8_t *)S + S_SIZE_ALL / 2;
/* Convert 128-byte blocks to 64-byte blocks */
r *= 2;
r--;
PREFETCH(&Bin2[r], _MM_HINT_T0)
PREFETCH(&Bin1[r], _MM_HINT_T0)
for (i = 0; i < r; i++) {
PREFETCH(&Bin2[i], _MM_HINT_T0)
PREFETCH(&Bin1[i], _MM_HINT_T0)
PREFETCH_OUT(&Bout[i], _MM_HINT_T0)
}
PREFETCH_OUT(&Bout[r], _MM_HINT_T0);
/* X <-- B_{r1 - 1} */
XOR4_2(Bin1[r].q, Bin2[r].q)
/* for i = 0 to r1 - 1 do */
for (i = 0; i < r; i++) {
XOR4(Bin1[i].q, Bin2[i].q)
/* X <-- H'(X \xor B_i) */
XOR4_Y
PWXFORM
/* B'_i <-- X */
OUT(Bout[i].q)
}
/* Last iteration of the loop above */
XOR4(Bin1[i].q, Bin2[i].q)
XOR4_Y
PWXFORM
/* B'_i <-- H(B'_i) */
SALSA20_8(Bout[i].q)
return _mm_cvtsi128_si32(X0);
}
#undef ARX
#undef SALSA20_2ROUNDS
#undef SALSA20_8
#undef SALSA20_8_XOR_ANY
#undef SALSA20_8_XOR_MEM
#undef SALSA20_8_XOR_REG
#undef PWXFORM_SIMD_1
#undef PWXFORM_SIMD_2
#undef PWXFORM_ROUND
#undef PWXFORM
#undef OUT
#undef XOR4
#undef XOR4_2
#undef XOR4_Y
/**
* integerify(B, r):
* Return the result of parsing B_{2r-1} as a little-endian integer.
*/
static inline uint32_t
integerify(const salsa20_blk_t * B, size_t r)
{
return B[2 * r - 1].w[0];
}
/**
* smix1(B, r, N, flags, V, NROM, shared, XY, S):
* Compute first loop of B = SMix_r(B, N). The input B must be 128r bytes in
* length; the temporary storage V must be 128rN bytes in length; the temporary
* storage XY must be 128r bytes in length. The value N must be even and no
* smaller than 2. The array V must be aligned to a multiple of 64 bytes, and
* arrays B and XY to a multiple of at least 16 bytes (aligning them to 64
* bytes as well saves cache lines, but might result in cache bank conflicts).
*/
static void
smix1(uint8_t * B, size_t r, uint32_t N, yescrypt_flags_t flags,
salsa20_blk_t * V, uint32_t NROM, const yescrypt_shared_t * shared,
salsa20_blk_t * XY, void * S)
{
const salsa20_blk_t * VROM = shared->shared1.aligned;
uint32_t VROM_mask = shared->mask1;
size_t s = 2 * r;
salsa20_blk_t * X = V, * Y;
uint32_t i, j;
size_t k;
/* 1: X <-- B */
/* 3: V_i <-- X */
for (k = 0; k < 2 * r; k++) {
for (i = 0; i < 16; i++) {
X[k].w[i] = le32dec(&B[(k * 16 + (i * 5 % 16)) * 4]);
}
}
if (NROM && (VROM_mask & 1)) {
uint32_t n;
salsa20_blk_t * V_n;
const salsa20_blk_t * V_j;
/* 4: X <-- H(X) */
/* 3: V_i <-- X */
Y = &V[s];
blockmix(X, Y, r, S);
X = &V[2 * s];
if ((1 & VROM_mask) == 1) {
/* j <-- Integerify(X) mod NROM */
j = integerify(Y, r) & (NROM - 1);
V_j = &VROM[j * s];
/* X <-- H(X \xor VROM_j) */
j = blockmix_xor(Y, V_j, X, r, 1, S);
} else {
/* X <-- H(X) */
blockmix(Y, X, r, S);
j = integerify(X, r);
}
for (n = 2; n < N; n <<= 1) {
uint32_t m = (n < N / 2) ? n : (N - 1 - n);
V_n = &V[n * s];
/* 2: for i = 0 to N - 1 do */
for (i = 1; i < m; i += 2) {
/* j <-- Wrap(Integerify(X), i) */
j &= n - 1;
j += i - 1;
V_j = &V[j * s];
/* X <-- X \xor V_j */
/* 4: X <-- H(X) */
/* 3: V_i <-- X */
Y = &V_n[i * s];
j = blockmix_xor(X, V_j, Y, r, 0, S);
if (((n + i) & VROM_mask) == 1) {
/* j <-- Integerify(X) mod NROM */
j &= NROM - 1;
V_j = &VROM[j * s];
} else {
/* j <-- Wrap(Integerify(X), i) */
j &= n - 1;
j += i;
V_j = &V[j * s];
}
/* X <-- H(X \xor VROM_j) */
X = &V_n[(i + 1) * s];
j = blockmix_xor(Y, V_j, X, r, 1, S);
}
}
n >>= 1;
/* j <-- Wrap(Integerify(X), i) */
j &= n - 1;
j += N - 2 - n;
V_j = &V[j * s];
/* X <-- X \xor V_j */
/* 4: X <-- H(X) */
/* 3: V_i <-- X */
Y = &V[(N - 1) * s];
j = blockmix_xor(X, V_j, Y, r, 0, S);
if (((N - 1) & VROM_mask) == 1) {
/* j <-- Integerify(X) mod NROM */
j &= NROM - 1;
V_j = &VROM[j * s];
} else {
/* j <-- Wrap(Integerify(X), i) */
j &= n - 1;
j += N - 1 - n;
V_j = &V[j * s];
}
/* X <-- X \xor V_j */
/* 4: X <-- H(X) */
X = XY;
blockmix_xor(Y, V_j, X, r, 1, S);
} else if (flags & YESCRYPT_RW) {
uint32_t n;
salsa20_blk_t * V_n, * V_j;
/* 4: X <-- H(X) */
/* 3: V_i <-- X */
Y = &V[s];
blockmix(X, Y, r, S);
/* 4: X <-- H(X) */
/* 3: V_i <-- X */
X = &V[2 * s];
blockmix(Y, X, r, S);
j = integerify(X, r);
for (n = 2; n < N; n <<= 1) {
uint32_t m = (n < N / 2) ? n : (N - 1 - n);
V_n = &V[n * s];
/* 2: for i = 0 to N - 1 do */
for (i = 1; i < m; i += 2) {
Y = &V_n[i * s];
/* j <-- Wrap(Integerify(X), i) */
j &= n - 1;
j += i - 1;
V_j = &V[j * s];
/* X <-- X \xor V_j */
/* 4: X <-- H(X) */
/* 3: V_i <-- X */
j = blockmix_xor(X, V_j, Y, r, 0, S);
/* j <-- Wrap(Integerify(X), i) */
j &= n - 1;
j += i;
V_j = &V[j * s];
/* X <-- X \xor V_j */
/* 4: X <-- H(X) */
/* 3: V_i <-- X */
X = &V_n[(i + 1) * s];
j = blockmix_xor(Y, V_j, X, r, 0, S);
}
}
n >>= 1;
/* j <-- Wrap(Integerify(X), i) */
j &= n - 1;
j += N - 2 - n;
V_j = &V[j * s];
/* X <-- X \xor V_j */
/* 4: X <-- H(X) */
/* 3: V_i <-- X */
Y = &V[(N - 1) * s];
j = blockmix_xor(X, V_j, Y, r, 0, S);
/* j <-- Wrap(Integerify(X), i) */
j &= n - 1;
j += N - 1 - n;
V_j = &V[j * s];
/* X <-- X \xor V_j */
/* 4: X <-- H(X) */
X = XY;
blockmix_xor(Y, V_j, X, r, 0, S);
} else {
/* 2: for i = 0 to N - 1 do */
for (i = 1; i < N - 1; i += 2) {
/* 4: X <-- H(X) */
/* 3: V_i <-- X */
Y = &V[i * s];
blockmix(X, Y, r, S);
/* 4: X <-- H(X) */
/* 3: V_i <-- X */
X = &V[(i + 1) * s];
blockmix(Y, X, r, S);
}
/* 4: X <-- H(X) */
/* 3: V_i <-- X */
Y = &V[i * s];
blockmix(X, Y, r, S);
/* 4: X <-- H(X) */
X = XY;
blockmix(Y, X, r, S);
}
/* B' <-- X */
for (k = 0; k < 2 * r; k++) {
for (i = 0; i < 16; i++) {
le32enc(&B[(k * 16 + (i * 5 % 16)) * 4], X[k].w[i]);
}
}
}
/**
* smix2(B, r, N, Nloop, flags, V, NROM, shared, XY, S):
* Compute second loop of B = SMix_r(B, N). The input B must be 128r bytes in
* length; the temporary storage V must be 128rN bytes in length; the temporary
* storage XY must be 256r bytes in length. The value N must be a power of 2
* greater than 1. The value Nloop must be even. The array V must be aligned
* to a multiple of 64 bytes, and arrays B and XY to a multiple of at least 16
* bytes (aligning them to 64 bytes as well saves cache lines, but might result
* in cache bank conflicts).
*/
static void
smix2(uint8_t * B, size_t r, uint32_t N, uint64_t Nloop,
yescrypt_flags_t flags, salsa20_blk_t * V, uint32_t NROM,
const yescrypt_shared_t * shared, salsa20_blk_t * XY, void * S)
{
const salsa20_blk_t * VROM = shared->shared1.aligned;
uint32_t VROM_mask = shared->mask1;
size_t s = 2 * r;
salsa20_blk_t * X = XY, * Y = &XY[s];
uint64_t i;
uint32_t j;
size_t k;
if (Nloop == 0)
return;
/* X <-- B' */
/* 3: V_i <-- X */
for (k = 0; k < 2 * r; k++) {
for (i = 0; i < 16; i++) {
X[k].w[i] = le32dec(&B[(k * 16 + (i * 5 % 16)) * 4]);
}
}
i = Nloop / 2;
/* 7: j <-- Integerify(X) mod N */
j = integerify(X, r) & (N - 1);
/*
* Normally, NROM implies YESCRYPT_RW, but we check for these separately
* because YESCRYPT_PARALLEL_SMIX resets YESCRYPT_RW for the smix2() calls
* operating on the entire V.
*/
if (NROM && (flags & YESCRYPT_RW)) {
/* 6: for i = 0 to N - 1 do */
for (i = 0; i < Nloop; i += 2) {
salsa20_blk_t * V_j = &V[j * s];
/* 8: X <-- H(X \xor V_j) */
/* V_j <-- Xprev \xor V_j */
/* j <-- Integerify(X) mod NROM */
j = blockmix_xor_save(X, V_j, Y, r, S);
if (((i + 1) & VROM_mask) == 1) {
const salsa20_blk_t * VROM_j;
j &= NROM - 1;
VROM_j = &VROM[j * s];
/* X <-- H(X \xor VROM_j) */
/* 7: j <-- Integerify(X) mod N */
j = blockmix_xor(Y, VROM_j, X, r, 1, S);
} else {
j &= N - 1;
V_j = &V[j * s];
/* 8: X <-- H(X \xor V_j) */
/* V_j <-- Xprev \xor V_j */
/* j <-- Integerify(X) mod NROM */
j = blockmix_xor_save(Y, V_j, X, r, S);
}
j &= N - 1;
V_j = &V[j * s];
}
} else if (NROM) {
/* 6: for i = 0 to N - 1 do */
for (i = 0; i < Nloop; i += 2) {
const salsa20_blk_t * V_j = &V[j * s];
/* 8: X <-- H(X \xor V_j) */
/* V_j <-- Xprev \xor V_j */
/* j <-- Integerify(X) mod NROM */
j = blockmix_xor(X, V_j, Y, r, 0, S);
if (((i + 1) & VROM_mask) == 1) {
j &= NROM - 1;
V_j = &VROM[j * s];
} else {
j &= N - 1;
V_j = &V[j * s];
}
/* X <-- H(X \xor VROM_j) */
/* 7: j <-- Integerify(X) mod N */
j = blockmix_xor(Y, V_j, X, r, 1, S);
j &= N - 1;
V_j = &V[j * s];
}
} else if (flags & YESCRYPT_RW) {
/* 6: for i = 0 to N - 1 do */
do {
salsa20_blk_t * V_j = &V[j * s];
/* 8: X <-- H(X \xor V_j) */
/* V_j <-- Xprev \xor V_j */
/* 7: j <-- Integerify(X) mod N */
j = blockmix_xor_save(X, V_j, Y, r, S);
j &= N - 1;
V_j = &V[j * s];
/* 8: X <-- H(X \xor V_j) */
/* V_j <-- Xprev \xor V_j */
/* 7: j <-- Integerify(X) mod N */
j = blockmix_xor_save(Y, V_j, X, r, S);
j &= N - 1;
} while (--i);
} else {
/* 6: for i = 0 to N - 1 do */
do {
const salsa20_blk_t * V_j = &V[j * s];