248 lines
6.8 KiB
C
248 lines
6.8 KiB
C
/*-
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* Copyright 2009 Colin Percival
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file was originally written by Colin Percival as part of the Tarsnap
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* online backup system.
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*/
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#include "cpusupport.h"
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#ifdef CPUSUPPORT_X86_SSE2
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#include <emmintrin.h>
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#include <stdint.h>
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#include "sysendian.h"
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#include "crypto_scrypt_smix_sse2.h"
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static void blkcpy(void *, const void *, size_t);
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static void blkxor(void *, const void *, size_t);
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static void salsa20_8(__m128i *);
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static void blockmix_salsa8(const __m128i *, __m128i *, __m128i *, size_t);
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static uint64_t integerify(const void *, size_t);
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static void
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blkcpy(void * dest, const void * src, size_t len)
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{
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__m128i * D = dest;
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const __m128i * S = src;
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size_t L = len / 16;
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size_t i;
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for (i = 0; i < L; i++)
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D[i] = S[i];
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}
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static void
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blkxor(void * dest, const void * src, size_t len)
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{
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__m128i * D = dest;
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const __m128i * S = src;
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size_t L = len / 16;
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size_t i;
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for (i = 0; i < L; i++)
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D[i] = _mm_xor_si128(D[i], S[i]);
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}
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/**
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* salsa20_8(B):
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* Apply the salsa20/8 core to the provided block.
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*/
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static void
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salsa20_8(__m128i B[4])
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{
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__m128i X0, X1, X2, X3;
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__m128i T;
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size_t i;
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X0 = B[0];
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X1 = B[1];
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X2 = B[2];
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X3 = B[3];
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for (i = 0; i < 8; i += 2) {
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/* Operate on "columns". */
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T = _mm_add_epi32(X0, X3);
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X1 = _mm_xor_si128(X1, _mm_slli_epi32(T, 7));
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X1 = _mm_xor_si128(X1, _mm_srli_epi32(T, 25));
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T = _mm_add_epi32(X1, X0);
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X2 = _mm_xor_si128(X2, _mm_slli_epi32(T, 9));
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X2 = _mm_xor_si128(X2, _mm_srli_epi32(T, 23));
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T = _mm_add_epi32(X2, X1);
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X3 = _mm_xor_si128(X3, _mm_slli_epi32(T, 13));
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X3 = _mm_xor_si128(X3, _mm_srli_epi32(T, 19));
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T = _mm_add_epi32(X3, X2);
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X0 = _mm_xor_si128(X0, _mm_slli_epi32(T, 18));
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X0 = _mm_xor_si128(X0, _mm_srli_epi32(T, 14));
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/* Rearrange data. */
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X1 = _mm_shuffle_epi32(X1, 0x93);
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X2 = _mm_shuffle_epi32(X2, 0x4E);
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X3 = _mm_shuffle_epi32(X3, 0x39);
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/* Operate on "rows". */
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T = _mm_add_epi32(X0, X1);
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X3 = _mm_xor_si128(X3, _mm_slli_epi32(T, 7));
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X3 = _mm_xor_si128(X3, _mm_srli_epi32(T, 25));
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T = _mm_add_epi32(X3, X0);
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X2 = _mm_xor_si128(X2, _mm_slli_epi32(T, 9));
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X2 = _mm_xor_si128(X2, _mm_srli_epi32(T, 23));
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T = _mm_add_epi32(X2, X3);
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X1 = _mm_xor_si128(X1, _mm_slli_epi32(T, 13));
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X1 = _mm_xor_si128(X1, _mm_srli_epi32(T, 19));
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T = _mm_add_epi32(X1, X2);
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X0 = _mm_xor_si128(X0, _mm_slli_epi32(T, 18));
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X0 = _mm_xor_si128(X0, _mm_srli_epi32(T, 14));
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/* Rearrange data. */
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X1 = _mm_shuffle_epi32(X1, 0x39);
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X2 = _mm_shuffle_epi32(X2, 0x4E);
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X3 = _mm_shuffle_epi32(X3, 0x93);
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}
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B[0] = _mm_add_epi32(B[0], X0);
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B[1] = _mm_add_epi32(B[1], X1);
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B[2] = _mm_add_epi32(B[2], X2);
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B[3] = _mm_add_epi32(B[3], X3);
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}
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/**
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* blockmix_salsa8(Bin, Bout, X, r):
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* Compute Bout = BlockMix_{salsa20/8, r}(Bin). The input Bin must be 128r
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* bytes in length; the output Bout must also be the same size. The
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* temporary space X must be 64 bytes.
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*/
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static void
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blockmix_salsa8(const __m128i * Bin, __m128i * Bout, __m128i * X, size_t r)
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{
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size_t i;
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/* 1: X <-- B_{2r - 1} */
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blkcpy(X, &Bin[8 * r - 4], 64);
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/* 2: for i = 0 to 2r - 1 do */
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for (i = 0; i < r; i++) {
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/* 3: X <-- H(X \xor B_i) */
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blkxor(X, &Bin[i * 8], 64);
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salsa20_8(X);
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/* 4: Y_i <-- X */
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/* 6: B' <-- (Y_0, Y_2 ... Y_{2r-2}, Y_1, Y_3 ... Y_{2r-1}) */
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blkcpy(&Bout[i * 4], X, 64);
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/* 3: X <-- H(X \xor B_i) */
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blkxor(X, &Bin[i * 8 + 4], 64);
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salsa20_8(X);
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/* 4: Y_i <-- X */
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/* 6: B' <-- (Y_0, Y_2 ... Y_{2r-2}, Y_1, Y_3 ... Y_{2r-1}) */
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blkcpy(&Bout[(r + i) * 4], X, 64);
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}
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}
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/**
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* integerify(B, r):
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* Return the result of parsing B_{2r-1} as a little-endian integer.
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*/
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static uint64_t
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integerify(const void * B, size_t r)
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{
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const uint32_t * X = (const void *)((uintptr_t)(B) + (2 * r - 1) * 64);
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return (((uint64_t)(X[13]) << 32) + X[0]);
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}
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/**
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* crypto_scrypt_smix_sse2(B, r, N, V, XY):
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* Compute B = SMix_r(B, N). The input B must be 128r bytes in length;
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* the temporary storage V must be 128rN bytes in length; the temporary
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* storage XY must be 256r + 64 bytes in length. The value N must be a
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* power of 2 greater than 1. The arrays B, V, and XY must be aligned to a
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* multiple of 64 bytes.
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*
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* Use SSE2 instructions.
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*/
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void
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crypto_scrypt_smix_sse2(uint8_t * B, size_t r, uint64_t N, void * V, void * XY)
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{
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__m128i * X = XY;
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__m128i * Y = (void *)((uintptr_t)(XY) + 128 * r);
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__m128i * Z = (void *)((uintptr_t)(XY) + 256 * r);
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uint32_t * X32 = (void *)X;
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uint64_t i, j;
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size_t k;
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/* 1: X <-- B */
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for (k = 0; k < 2 * r; k++) {
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for (i = 0; i < 16; i++) {
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X32[k * 16 + i] =
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le32dec(&B[(k * 16 + (i * 5 % 16)) * 4]);
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}
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}
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/* 2: for i = 0 to N - 1 do */
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for (i = 0; i < N; i += 2) {
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/* 3: V_i <-- X */
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blkcpy((void *)((uintptr_t)(V) + i * 128 * r), X, 128 * r);
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/* 4: X <-- H(X) */
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blockmix_salsa8(X, Y, Z, r);
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/* 3: V_i <-- X */
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blkcpy((void *)((uintptr_t)(V) + (i + 1) * 128 * r),
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Y, 128 * r);
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/* 4: X <-- H(X) */
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blockmix_salsa8(Y, X, Z, r);
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}
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/* 6: for i = 0 to N - 1 do */
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for (i = 0; i < N; i += 2) {
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/* 7: j <-- Integerify(X) mod N */
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j = integerify(X, r) & (N - 1);
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/* 8: X <-- H(X \xor V_j) */
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blkxor(X, (void *)((uintptr_t)(V) + j * 128 * r), 128 * r);
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blockmix_salsa8(X, Y, Z, r);
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/* 7: j <-- Integerify(X) mod N */
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j = integerify(Y, r) & (N - 1);
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/* 8: X <-- H(X \xor V_j) */
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blkxor(Y, (void *)((uintptr_t)(V) + j * 128 * r), 128 * r);
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blockmix_salsa8(Y, X, Z, r);
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}
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/* 10: B' <-- X */
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for (k = 0; k < 2 * r; k++) {
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for (i = 0; i < 16; i++) {
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le32enc(&B[(k * 16 + (i * 5 % 16)) * 4],
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X32[k * 16 + i]);
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}
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}
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}
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#endif /* CPUSUPPORT_X86_SSE2 */
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