btrfs-progs: crypto: add SSE2 implementation of BLAKE2

Copy implementation from https://github.com/BLAKE2/BLAKE2, add runtime
detection of SSE2 and add the switch function.

Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2023-02-09 02:50:57 +01:00
parent 3157c572e1
commit 1f2117eae8
6 changed files with 411 additions and 2 deletions

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@ -129,6 +129,10 @@ LIBBTRFSUTIL_LDFLAGS = $(SUBST_LDFLAGS) \
# Default implementation
CRYPTO_OBJECTS =
ifeq ($(shell uname -m),x86_64)
crypto_blake2b_sse2_cflags = -msse2
endif
LIBS = $(LIBS_BASE) $(LIBS_CRYPTO)
LIBBTRFS_LIBS = $(LIBS_BASE) $(LIBS_CRYPTO)
@ -347,7 +351,7 @@ btrfs_fragments_libs = -lgd -lpng -ljpeg -lfreetype
cmds_restore_cflags = -DCOMPRESSION_LZO=$(COMPRESSION_LZO) -DCOMPRESSION_ZSTD=$(COMPRESSION_ZSTD)
ifeq ($(CRYPTOPROVIDER_BUILTIN),1)
CRYPTO_OBJECTS = crypto/sha224-256.o crypto/blake2b-ref.o
CRYPTO_OBJECTS = crypto/sha224-256.o crypto/blake2b-ref.o crypto/blake2b-sse2.o
CRYPTO_CFLAGS = -DCRYPTOPROVIDER_BUILTIN=1
endif

68
crypto/blake2-config.h Normal file
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@ -0,0 +1,68 @@
/*
BLAKE2 reference source code package - optimized C implementations
Copyright 2012, Samuel Neves <sneves@dei.uc.pt>. You may use this under the
terms of the CC0, the OpenSSL Licence, or the Apache Public License 2.0, at
your option. The terms of these licenses can be found at:
- CC0 1.0 Universal : http://creativecommons.org/publicdomain/zero/1.0
- OpenSSL license : https://www.openssl.org/source/license.html
- Apache 2.0 : http://www.apache.org/licenses/LICENSE-2.0
More information about the BLAKE2 hash function can be found at
https://blake2.net.
*/
#ifndef BLAKE2_CONFIG_H
#define BLAKE2_CONFIG_H
/* These don't work everywhere */
#if defined(__SSE2__) || defined(__x86_64__) || defined(__amd64__)
#define HAVE_SSE2
#endif
#if defined(__SSSE3__)
#define HAVE_SSSE3
#endif
#if defined(__SSE4_1__)
#define HAVE_SSE41
#endif
#if defined(__AVX__)
#define HAVE_AVX
#endif
#if defined(__XOP__)
#define HAVE_XOP
#endif
#ifdef HAVE_AVX2
#ifndef HAVE_AVX
#define HAVE_AVX
#endif
#endif
#ifdef HAVE_XOP
#ifndef HAVE_AVX
#define HAVE_AVX
#endif
#endif
#ifdef HAVE_AVX
#ifndef HAVE_SSE41
#define HAVE_SSE41
#endif
#endif
#ifdef HAVE_SSE41
#ifndef HAVE_SSSE3
#define HAVE_SSSE3
#endif
#endif
#ifdef HAVE_SSSE3
#define HAVE_SSE2
#endif
#endif

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@ -0,0 +1,68 @@
/*
BLAKE2 reference source code package - optimized C implementations
Copyright 2012, Samuel Neves <sneves@dei.uc.pt>. You may use this under the
terms of the CC0, the OpenSSL Licence, or the Apache Public License 2.0, at
your option. The terms of these licenses can be found at:
- CC0 1.0 Universal : http://creativecommons.org/publicdomain/zero/1.0
- OpenSSL license : https://www.openssl.org/source/license.html
- Apache 2.0 : http://www.apache.org/licenses/LICENSE-2.0
More information about the BLAKE2 hash function can be found at
https://blake2.net.
*/
#ifndef BLAKE2B_LOAD_SSE2_H
#define BLAKE2B_LOAD_SSE2_H
#define LOAD_MSG_0_1(b0, b1) b0 = _mm_set_epi64x(m2, m0); b1 = _mm_set_epi64x(m6, m4)
#define LOAD_MSG_0_2(b0, b1) b0 = _mm_set_epi64x(m3, m1); b1 = _mm_set_epi64x(m7, m5)
#define LOAD_MSG_0_3(b0, b1) b0 = _mm_set_epi64x(m10, m8); b1 = _mm_set_epi64x(m14, m12)
#define LOAD_MSG_0_4(b0, b1) b0 = _mm_set_epi64x(m11, m9); b1 = _mm_set_epi64x(m15, m13)
#define LOAD_MSG_1_1(b0, b1) b0 = _mm_set_epi64x(m4, m14); b1 = _mm_set_epi64x(m13, m9)
#define LOAD_MSG_1_2(b0, b1) b0 = _mm_set_epi64x(m8, m10); b1 = _mm_set_epi64x(m6, m15)
#define LOAD_MSG_1_3(b0, b1) b0 = _mm_set_epi64x(m0, m1); b1 = _mm_set_epi64x(m5, m11)
#define LOAD_MSG_1_4(b0, b1) b0 = _mm_set_epi64x(m2, m12); b1 = _mm_set_epi64x(m3, m7)
#define LOAD_MSG_2_1(b0, b1) b0 = _mm_set_epi64x(m12, m11); b1 = _mm_set_epi64x(m15, m5)
#define LOAD_MSG_2_2(b0, b1) b0 = _mm_set_epi64x(m0, m8); b1 = _mm_set_epi64x(m13, m2)
#define LOAD_MSG_2_3(b0, b1) b0 = _mm_set_epi64x(m3, m10); b1 = _mm_set_epi64x(m9, m7)
#define LOAD_MSG_2_4(b0, b1) b0 = _mm_set_epi64x(m6, m14); b1 = _mm_set_epi64x(m4, m1)
#define LOAD_MSG_3_1(b0, b1) b0 = _mm_set_epi64x(m3, m7); b1 = _mm_set_epi64x(m11, m13)
#define LOAD_MSG_3_2(b0, b1) b0 = _mm_set_epi64x(m1, m9); b1 = _mm_set_epi64x(m14, m12)
#define LOAD_MSG_3_3(b0, b1) b0 = _mm_set_epi64x(m5, m2); b1 = _mm_set_epi64x(m15, m4)
#define LOAD_MSG_3_4(b0, b1) b0 = _mm_set_epi64x(m10, m6); b1 = _mm_set_epi64x(m8, m0)
#define LOAD_MSG_4_1(b0, b1) b0 = _mm_set_epi64x(m5, m9); b1 = _mm_set_epi64x(m10, m2)
#define LOAD_MSG_4_2(b0, b1) b0 = _mm_set_epi64x(m7, m0); b1 = _mm_set_epi64x(m15, m4)
#define LOAD_MSG_4_3(b0, b1) b0 = _mm_set_epi64x(m11, m14); b1 = _mm_set_epi64x(m3, m6)
#define LOAD_MSG_4_4(b0, b1) b0 = _mm_set_epi64x(m12, m1); b1 = _mm_set_epi64x(m13, m8)
#define LOAD_MSG_5_1(b0, b1) b0 = _mm_set_epi64x(m6, m2); b1 = _mm_set_epi64x(m8, m0)
#define LOAD_MSG_5_2(b0, b1) b0 = _mm_set_epi64x(m10, m12); b1 = _mm_set_epi64x(m3, m11)
#define LOAD_MSG_5_3(b0, b1) b0 = _mm_set_epi64x(m7, m4); b1 = _mm_set_epi64x(m1, m15)
#define LOAD_MSG_5_4(b0, b1) b0 = _mm_set_epi64x(m5, m13); b1 = _mm_set_epi64x(m9, m14)
#define LOAD_MSG_6_1(b0, b1) b0 = _mm_set_epi64x(m1, m12); b1 = _mm_set_epi64x(m4, m14)
#define LOAD_MSG_6_2(b0, b1) b0 = _mm_set_epi64x(m15, m5); b1 = _mm_set_epi64x(m10, m13)
#define LOAD_MSG_6_3(b0, b1) b0 = _mm_set_epi64x(m6, m0); b1 = _mm_set_epi64x(m8, m9)
#define LOAD_MSG_6_4(b0, b1) b0 = _mm_set_epi64x(m3, m7); b1 = _mm_set_epi64x(m11, m2)
#define LOAD_MSG_7_1(b0, b1) b0 = _mm_set_epi64x(m7, m13); b1 = _mm_set_epi64x(m3, m12)
#define LOAD_MSG_7_2(b0, b1) b0 = _mm_set_epi64x(m14, m11); b1 = _mm_set_epi64x(m9, m1)
#define LOAD_MSG_7_3(b0, b1) b0 = _mm_set_epi64x(m15, m5); b1 = _mm_set_epi64x(m2, m8)
#define LOAD_MSG_7_4(b0, b1) b0 = _mm_set_epi64x(m4, m0); b1 = _mm_set_epi64x(m10, m6)
#define LOAD_MSG_8_1(b0, b1) b0 = _mm_set_epi64x(m14, m6); b1 = _mm_set_epi64x(m0, m11)
#define LOAD_MSG_8_2(b0, b1) b0 = _mm_set_epi64x(m9, m15); b1 = _mm_set_epi64x(m8, m3)
#define LOAD_MSG_8_3(b0, b1) b0 = _mm_set_epi64x(m13, m12); b1 = _mm_set_epi64x(m10, m1)
#define LOAD_MSG_8_4(b0, b1) b0 = _mm_set_epi64x(m7, m2); b1 = _mm_set_epi64x(m5, m4)
#define LOAD_MSG_9_1(b0, b1) b0 = _mm_set_epi64x(m8, m10); b1 = _mm_set_epi64x(m1, m7)
#define LOAD_MSG_9_2(b0, b1) b0 = _mm_set_epi64x(m4, m2); b1 = _mm_set_epi64x(m5, m6)
#define LOAD_MSG_9_3(b0, b1) b0 = _mm_set_epi64x(m9, m15); b1 = _mm_set_epi64x(m13, m3)
#define LOAD_MSG_9_4(b0, b1) b0 = _mm_set_epi64x(m14, m11); b1 = _mm_set_epi64x(m0, m12)
#define LOAD_MSG_10_1(b0, b1) b0 = _mm_set_epi64x(m2, m0); b1 = _mm_set_epi64x(m6, m4)
#define LOAD_MSG_10_2(b0, b1) b0 = _mm_set_epi64x(m3, m1); b1 = _mm_set_epi64x(m7, m5)
#define LOAD_MSG_10_3(b0, b1) b0 = _mm_set_epi64x(m10, m8); b1 = _mm_set_epi64x(m14, m12)
#define LOAD_MSG_10_4(b0, b1) b0 = _mm_set_epi64x(m11, m9); b1 = _mm_set_epi64x(m15, m13)
#define LOAD_MSG_11_1(b0, b1) b0 = _mm_set_epi64x(m4, m14); b1 = _mm_set_epi64x(m13, m9)
#define LOAD_MSG_11_2(b0, b1) b0 = _mm_set_epi64x(m8, m10); b1 = _mm_set_epi64x(m6, m15)
#define LOAD_MSG_11_3(b0, b1) b0 = _mm_set_epi64x(m0, m1); b1 = _mm_set_epi64x(m5, m11)
#define LOAD_MSG_11_4(b0, b1) b0 = _mm_set_epi64x(m2, m12); b1 = _mm_set_epi64x(m3, m7)
#endif

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@ -20,6 +20,8 @@
#include "blake2.h"
#include "blake2-impl.h"
#include "common/cpu-utils.h"
static const uint64_t blake2b_IV[8] =
{
0x6a09e667f3bcc908ULL, 0xbb67ae8584caa73bULL,
@ -174,7 +176,7 @@ int blake2b_init_key( blake2b_state *S, size_t outlen, const void *key, size_t k
G(r,7,v[ 3],v[ 4],v[ 9],v[14]); \
} while(0)
static void blake2b_compress( blake2b_state *S, const uint8_t block[BLAKE2B_BLOCKBYTES] )
static void blake2b_compress_ref( blake2b_state *S, const uint8_t block[BLAKE2B_BLOCKBYTES] )
{
uint64_t m[16];
uint64_t v[16];
@ -218,6 +220,17 @@ static void blake2b_compress( blake2b_state *S, const uint8_t block[BLAKE2B_BLOC
#undef G
#undef ROUND
void blake2b_compress_sse2( blake2b_state *S, const uint8_t block[BLAKE2B_BLOCKBYTES] );
static void blake2b_compress( blake2b_state *S, const uint8_t block[BLAKE2B_BLOCKBYTES] )
{
#if HAVE_SSE2
if (cpu_has_feature(CPU_FLAG_SSE2))
return blake2b_compress_sse2(S, block);
#endif
return blake2b_compress_ref(S, block);
}
int blake2b_update( blake2b_state *S, const void *pin, size_t inlen )
{
const unsigned char * in = (const unsigned char *)pin;

157
crypto/blake2b-round.h Normal file
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@ -0,0 +1,157 @@
/*
BLAKE2 reference source code package - optimized C implementations
Copyright 2012, Samuel Neves <sneves@dei.uc.pt>. You may use this under the
terms of the CC0, the OpenSSL Licence, or the Apache Public License 2.0, at
your option. The terms of these licenses can be found at:
- CC0 1.0 Universal : http://creativecommons.org/publicdomain/zero/1.0
- OpenSSL license : https://www.openssl.org/source/license.html
- Apache 2.0 : http://www.apache.org/licenses/LICENSE-2.0
More information about the BLAKE2 hash function can be found at
https://blake2.net.
*/
#ifndef BLAKE2B_ROUND_H
#define BLAKE2B_ROUND_H
#define LOADU(p) _mm_loadu_si128( (const __m128i *)(p) )
#define STOREU(p,r) _mm_storeu_si128((__m128i *)(p), r)
#define TOF(reg) _mm_castsi128_ps((reg))
#define TOI(reg) _mm_castps_si128((reg))
#define LIKELY(x) __builtin_expect((x),1)
/* Microarchitecture-specific macros */
#ifndef HAVE_XOP
#ifdef HAVE_SSSE3
#define _mm_roti_epi64(x, c) \
(-(c) == 32) ? _mm_shuffle_epi32((x), _MM_SHUFFLE(2,3,0,1)) \
: (-(c) == 24) ? _mm_shuffle_epi8((x), r24) \
: (-(c) == 16) ? _mm_shuffle_epi8((x), r16) \
: (-(c) == 63) ? _mm_xor_si128(_mm_srli_epi64((x), -(c)), _mm_add_epi64((x), (x))) \
: _mm_xor_si128(_mm_srli_epi64((x), -(c)), _mm_slli_epi64((x), 64-(-(c))))
#else
#define _mm_roti_epi64(r, c) _mm_xor_si128(_mm_srli_epi64( (r), -(c) ),_mm_slli_epi64( (r), 64-(-(c)) ))
#endif
#else
/* ... */
#endif
#define G1(row1l,row2l,row3l,row4l,row1h,row2h,row3h,row4h,b0,b1) \
row1l = _mm_add_epi64(_mm_add_epi64(row1l, b0), row2l); \
row1h = _mm_add_epi64(_mm_add_epi64(row1h, b1), row2h); \
\
row4l = _mm_xor_si128(row4l, row1l); \
row4h = _mm_xor_si128(row4h, row1h); \
\
row4l = _mm_roti_epi64(row4l, -32); \
row4h = _mm_roti_epi64(row4h, -32); \
\
row3l = _mm_add_epi64(row3l, row4l); \
row3h = _mm_add_epi64(row3h, row4h); \
\
row2l = _mm_xor_si128(row2l, row3l); \
row2h = _mm_xor_si128(row2h, row3h); \
\
row2l = _mm_roti_epi64(row2l, -24); \
row2h = _mm_roti_epi64(row2h, -24); \
#define G2(row1l,row2l,row3l,row4l,row1h,row2h,row3h,row4h,b0,b1) \
row1l = _mm_add_epi64(_mm_add_epi64(row1l, b0), row2l); \
row1h = _mm_add_epi64(_mm_add_epi64(row1h, b1), row2h); \
\
row4l = _mm_xor_si128(row4l, row1l); \
row4h = _mm_xor_si128(row4h, row1h); \
\
row4l = _mm_roti_epi64(row4l, -16); \
row4h = _mm_roti_epi64(row4h, -16); \
\
row3l = _mm_add_epi64(row3l, row4l); \
row3h = _mm_add_epi64(row3h, row4h); \
\
row2l = _mm_xor_si128(row2l, row3l); \
row2h = _mm_xor_si128(row2h, row3h); \
\
row2l = _mm_roti_epi64(row2l, -63); \
row2h = _mm_roti_epi64(row2h, -63); \
#if defined(HAVE_SSSE3)
#define DIAGONALIZE(row1l,row2l,row3l,row4l,row1h,row2h,row3h,row4h) \
t0 = _mm_alignr_epi8(row2h, row2l, 8); \
t1 = _mm_alignr_epi8(row2l, row2h, 8); \
row2l = t0; \
row2h = t1; \
\
t0 = row3l; \
row3l = row3h; \
row3h = t0; \
\
t0 = _mm_alignr_epi8(row4h, row4l, 8); \
t1 = _mm_alignr_epi8(row4l, row4h, 8); \
row4l = t1; \
row4h = t0;
#define UNDIAGONALIZE(row1l,row2l,row3l,row4l,row1h,row2h,row3h,row4h) \
t0 = _mm_alignr_epi8(row2l, row2h, 8); \
t1 = _mm_alignr_epi8(row2h, row2l, 8); \
row2l = t0; \
row2h = t1; \
\
t0 = row3l; \
row3l = row3h; \
row3h = t0; \
\
t0 = _mm_alignr_epi8(row4l, row4h, 8); \
t1 = _mm_alignr_epi8(row4h, row4l, 8); \
row4l = t1; \
row4h = t0;
#else
#define DIAGONALIZE(row1l,row2l,row3l,row4l,row1h,row2h,row3h,row4h) \
t0 = row4l;\
t1 = row2l;\
row4l = row3l;\
row3l = row3h;\
row3h = row4l;\
row4l = _mm_unpackhi_epi64(row4h, _mm_unpacklo_epi64(t0, t0)); \
row4h = _mm_unpackhi_epi64(t0, _mm_unpacklo_epi64(row4h, row4h)); \
row2l = _mm_unpackhi_epi64(row2l, _mm_unpacklo_epi64(row2h, row2h)); \
row2h = _mm_unpackhi_epi64(row2h, _mm_unpacklo_epi64(t1, t1))
#define UNDIAGONALIZE(row1l,row2l,row3l,row4l,row1h,row2h,row3h,row4h) \
t0 = row3l;\
row3l = row3h;\
row3h = t0;\
t0 = row2l;\
t1 = row4l;\
row2l = _mm_unpackhi_epi64(row2h, _mm_unpacklo_epi64(row2l, row2l)); \
row2h = _mm_unpackhi_epi64(t0, _mm_unpacklo_epi64(row2h, row2h)); \
row4l = _mm_unpackhi_epi64(row4l, _mm_unpacklo_epi64(row4h, row4h)); \
row4h = _mm_unpackhi_epi64(row4h, _mm_unpacklo_epi64(t1, t1))
#endif
#if defined(HAVE_SSE41)
#include "blake2b-load-sse41.h"
#else
#include "blake2b-load-sse2.h"
#endif
#define ROUND(r) \
LOAD_MSG_ ##r ##_1(b0, b1); \
G1(row1l,row2l,row3l,row4l,row1h,row2h,row3h,row4h,b0,b1); \
LOAD_MSG_ ##r ##_2(b0, b1); \
G2(row1l,row2l,row3l,row4l,row1h,row2h,row3h,row4h,b0,b1); \
DIAGONALIZE(row1l,row2l,row3l,row4l,row1h,row2h,row3h,row4h); \
LOAD_MSG_ ##r ##_3(b0, b1); \
G1(row1l,row2l,row3l,row4l,row1h,row2h,row3h,row4h,b0,b1); \
LOAD_MSG_ ##r ##_4(b0, b1); \
G2(row1l,row2l,row3l,row4l,row1h,row2h,row3h,row4h,b0,b1); \
UNDIAGONALIZE(row1l,row2l,row3l,row4l,row1h,row2h,row3h,row4h);
#endif

99
crypto/blake2b-sse2.c Normal file
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@ -0,0 +1,99 @@
/*
BLAKE2 reference source code package - optimized C implementations
Copyright 2012, Samuel Neves <sneves@dei.uc.pt>. You may use this under the
terms of the CC0, the OpenSSL Licence, or the Apache Public License 2.0, at
your option. The terms of these licenses can be found at:
- CC0 1.0 Universal : http://creativecommons.org/publicdomain/zero/1.0
- OpenSSL license : https://www.openssl.org/source/license.html
- Apache 2.0 : http://www.apache.org/licenses/LICENSE-2.0
More information about the BLAKE2 hash function can be found at
https://blake2.net.
*/
#include <stdint.h>
#include <string.h>
#include "blake2.h"
#include "blake2-impl.h"
#include "blake2-config.h"
#ifdef HAVE_SSE2
#include <emmintrin.h>
#if defined(HAVE_XOP)
#include <x86intrin.h>
#endif
#include "blake2b-round.h"
static const uint64_t blake2b_IV[8] =
{
0x6a09e667f3bcc908ULL, 0xbb67ae8584caa73bULL,
0x3c6ef372fe94f82bULL, 0xa54ff53a5f1d36f1ULL,
0x510e527fade682d1ULL, 0x9b05688c2b3e6c1fULL,
0x1f83d9abfb41bd6bULL, 0x5be0cd19137e2179ULL
};
void blake2b_compress_sse2( blake2b_state *S, const uint8_t block[BLAKE2B_BLOCKBYTES] )
{
__m128i row1l, row1h;
__m128i row2l, row2h;
__m128i row3l, row3h;
__m128i row4l, row4h;
__m128i b0, b1;
__m128i t0, t1;
#if defined(HAVE_SSSE3) && !defined(HAVE_XOP)
const __m128i r16 = _mm_setr_epi8( 2, 3, 4, 5, 6, 7, 0, 1, 10, 11, 12, 13, 14, 15, 8, 9 );
const __m128i r24 = _mm_setr_epi8( 3, 4, 5, 6, 7, 0, 1, 2, 11, 12, 13, 14, 15, 8, 9, 10 );
#endif
const uint64_t m0 = load64(block + 0 * sizeof(uint64_t));
const uint64_t m1 = load64(block + 1 * sizeof(uint64_t));
const uint64_t m2 = load64(block + 2 * sizeof(uint64_t));
const uint64_t m3 = load64(block + 3 * sizeof(uint64_t));
const uint64_t m4 = load64(block + 4 * sizeof(uint64_t));
const uint64_t m5 = load64(block + 5 * sizeof(uint64_t));
const uint64_t m6 = load64(block + 6 * sizeof(uint64_t));
const uint64_t m7 = load64(block + 7 * sizeof(uint64_t));
const uint64_t m8 = load64(block + 8 * sizeof(uint64_t));
const uint64_t m9 = load64(block + 9 * sizeof(uint64_t));
const uint64_t m10 = load64(block + 10 * sizeof(uint64_t));
const uint64_t m11 = load64(block + 11 * sizeof(uint64_t));
const uint64_t m12 = load64(block + 12 * sizeof(uint64_t));
const uint64_t m13 = load64(block + 13 * sizeof(uint64_t));
const uint64_t m14 = load64(block + 14 * sizeof(uint64_t));
const uint64_t m15 = load64(block + 15 * sizeof(uint64_t));
row1l = LOADU( &S->h[0] );
row1h = LOADU( &S->h[2] );
row2l = LOADU( &S->h[4] );
row2h = LOADU( &S->h[6] );
row3l = LOADU( &blake2b_IV[0] );
row3h = LOADU( &blake2b_IV[2] );
row4l = _mm_xor_si128( LOADU( &blake2b_IV[4] ), LOADU( &S->t[0] ) );
row4h = _mm_xor_si128( LOADU( &blake2b_IV[6] ), LOADU( &S->f[0] ) );
ROUND( 0 );
ROUND( 1 );
ROUND( 2 );
ROUND( 3 );
ROUND( 4 );
ROUND( 5 );
ROUND( 6 );
ROUND( 7 );
ROUND( 8 );
ROUND( 9 );
ROUND( 10 );
ROUND( 11 );
row1l = _mm_xor_si128( row3l, row1l );
row1h = _mm_xor_si128( row3h, row1h );
STOREU( &S->h[0], _mm_xor_si128( LOADU( &S->h[0] ), row1l ) );
STOREU( &S->h[2], _mm_xor_si128( LOADU( &S->h[2] ), row1h ) );
row2l = _mm_xor_si128( row4l, row2l );
row2h = _mm_xor_si128( row4h, row2h );
STOREU( &S->h[4], _mm_xor_si128( LOADU( &S->h[4] ), row2l ) );
STOREU( &S->h[6], _mm_xor_si128( LOADU( &S->h[6] ), row2h ) );
}
#endif