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/* Copyright 2021 The ChromiumOS Authors
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*
* SHA256 implementation using x86 SHA extension.
* Mainly from https://github.com/noloader/SHA-Intrinsics/blob/master/sha256-x86.c,
* Written and place in public domain by Jeffrey Walton
* Based on code from Intel, and by Sean Gulley for
* the miTLS project.
*/
#include "2common.h"
#include "2sha.h"
#include "2sha_private.h"
#include "2api.h"
const uint32_t vb2_hash_seq[8] = {3, 2, 7, 6, 1, 0, 5, 4};
typedef int vb2_m128i __attribute__ ((vector_size(16)));
static inline vb2_m128i vb2_loadu_si128(vb2_m128i *ptr)
{
vb2_m128i result;
asm volatile ("movups %1, %0" : "=x"(result) : "m"(*ptr));
return result;
}
static inline void vb2_storeu_si128(vb2_m128i *to, vb2_m128i from)
{
asm volatile ("movups %1, %0" : "=m"(*to) : "x"(from));
}
static inline vb2_m128i vb2_add_epi32(vb2_m128i a, vb2_m128i b)
{
return a + b;
}
static inline vb2_m128i vb2_shuffle_epi8(vb2_m128i value, vb2_m128i mask)
{
asm ("pshufb %1, %0" : "+x"(value) : "xm"(mask));
return value;
}
static inline vb2_m128i vb2_shuffle_epi32(vb2_m128i value, int mask)
{
vb2_m128i result;
asm ("pshufd %2, %1, %0" : "=x"(result) : "xm"(value), "i" (mask));
return result;
}
static inline vb2_m128i vb2_alignr_epi8(vb2_m128i a, vb2_m128i b, int imm8)
{
asm ("palignr %2, %1, %0" : "+x"(a) : "xm"(b), "i"(imm8));
return a;
}
static inline vb2_m128i vb2_sha256msg1_epu32(vb2_m128i a, vb2_m128i b)
{
asm ("sha256msg1 %1, %0" : "+x"(a) : "xm"(b));
return a;
}
static inline vb2_m128i vb2_sha256msg2_epu32(vb2_m128i a, vb2_m128i b)
{
asm ("sha256msg2 %1, %0" : "+x"(a) : "xm"(b));
return a;
}
static inline vb2_m128i vb2_sha256rnds2_epu32(vb2_m128i a, vb2_m128i b,
vb2_m128i k)
{
asm ("sha256rnds2 %1, %0" : "+x"(a) : "xm"(b), "Yz"(k));
return a;
}
#define SHA256_X86_PUT_STATE1(j, i) \
{ \
msgtmp[j] = vb2_loadu_si128((vb2_m128i *) \
(message + (i << 6) + (j * 16))); \
msgtmp[j] = vb2_shuffle_epi8(msgtmp[j], shuf_mask); \
msg = vb2_add_epi32(msgtmp[j], \
vb2_loadu_si128((vb2_m128i *)&vb2_sha256_k[j * 4])); \
state1 = vb2_sha256rnds2_epu32(state1, state0, msg); \
}
#define SHA256_X86_PUT_STATE0() \
{ \
msg = vb2_shuffle_epi32(msg, 0x0E); \
state0 = vb2_sha256rnds2_epu32(state0, state1, msg); \
}
#define SHA256_X86_LOOP(j) \
{ \
int k = j & 3; \
int prev_k = (k + 3) & 3; \
int next_k = (k + 1) & 3; \
msg = vb2_add_epi32(msgtmp[k], \
vb2_loadu_si128((vb2_m128i *)&vb2_sha256_k[j * 4])); \
state1 = vb2_sha256rnds2_epu32(state1, state0, msg); \
tmp = vb2_alignr_epi8(msgtmp[k], msgtmp[prev_k], 4); \
msgtmp[next_k] = vb2_add_epi32(msgtmp[next_k], tmp); \
msgtmp[next_k] = vb2_sha256msg2_epu32(msgtmp[next_k], \
msgtmp[k]); \
SHA256_X86_PUT_STATE0(); \
msgtmp[prev_k] = vb2_sha256msg1_epu32(msgtmp[prev_k], \
msgtmp[k]); \
}
static void vb2_sha256_transform_x86ext(const uint8_t *message,
unsigned int block_nb)
{
vb2_m128i state0, state1, msg, abef_save, cdgh_save;
vb2_m128i msgtmp[4];
vb2_m128i tmp;
int i;
const vb2_m128i shuf_mask = {0x00010203, 0x04050607, 0x08090a0b, 0x0c0d0e0f};
state0 = vb2_loadu_si128((vb2_m128i *)&vb2_sha_ctx.h[0]);
state1 = vb2_loadu_si128((vb2_m128i *)&vb2_sha_ctx.h[4]);
for (i = 0; i < (int) block_nb; i++) {
abef_save = state0;
cdgh_save = state1;
SHA256_X86_PUT_STATE1(0, i);
SHA256_X86_PUT_STATE0();
SHA256_X86_PUT_STATE1(1, i);
SHA256_X86_PUT_STATE0();
msgtmp[0] = vb2_sha256msg1_epu32(msgtmp[0], msgtmp[1]);
SHA256_X86_PUT_STATE1(2, i);
SHA256_X86_PUT_STATE0();
msgtmp[1] = vb2_sha256msg1_epu32(msgtmp[1], msgtmp[2]);
SHA256_X86_PUT_STATE1(3, i);
tmp = vb2_alignr_epi8(msgtmp[3], msgtmp[2], 4);
msgtmp[0] = vb2_add_epi32(msgtmp[0], tmp);
msgtmp[0] = vb2_sha256msg2_epu32(msgtmp[0], msgtmp[3]);
SHA256_X86_PUT_STATE0();
msgtmp[2] = vb2_sha256msg1_epu32(msgtmp[2], msgtmp[3]);
SHA256_X86_LOOP(4);
SHA256_X86_LOOP(5);
SHA256_X86_LOOP(6);
SHA256_X86_LOOP(7);
SHA256_X86_LOOP(8);
SHA256_X86_LOOP(9);
SHA256_X86_LOOP(10);
SHA256_X86_LOOP(11);
SHA256_X86_LOOP(12);
SHA256_X86_LOOP(13);
SHA256_X86_LOOP(14);
msg = vb2_add_epi32(msgtmp[3],
vb2_loadu_si128((vb2_m128i *)&vb2_sha256_k[15 * 4]));
state1 = vb2_sha256rnds2_epu32(state1, state0, msg);
SHA256_X86_PUT_STATE0();
state0 = vb2_add_epi32(state0, abef_save);
state1 = vb2_add_epi32(state1, cdgh_save);
}
vb2_storeu_si128((vb2_m128i *)&vb2_sha_ctx.h[0], state0);
vb2_storeu_si128((vb2_m128i *)&vb2_sha_ctx.h[4], state1);
}
void vb2_sha256_transform_hwcrypto(const uint8_t *message,
unsigned int block_nb)
{
vb2_sha256_transform_x86ext(message, block_nb);
}
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