131 lines
4.5 KiB
C
131 lines
4.5 KiB
C
// Copyright 2013-2016 The OpenSSL Project Authors. All Rights Reserved.
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// Copyright (c) 2012, Intel Corporation. All Rights Reserved.
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//
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// Originally written by Shay Gueron (1, 2), and Vlad Krasnov (1)
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// (1) Intel Corporation, Israel Development Center, Haifa, Israel
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// (2) University of Haifa, Israel
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//
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// SPDX-License-Identifier: Apache-2.0
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#include "rsaz_exp.h"
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#if defined(RSAZ_ENABLED)
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#include <openssl/mem.h>
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#include "internal.h"
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#include "../../internal.h"
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// rsaz_one is 1 in RSAZ's representation.
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alignas(64) static const BN_ULONG rsaz_one[40] = {
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1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
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// rsaz_two80 is 2^80 in RSAZ's representation. Note RSAZ uses base 2^29, so this is
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// 2^(29*2 + 22) = 2^80, not 2^(64*2 + 22).
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alignas(64) static const BN_ULONG rsaz_two80[40] = {
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0, 0, 1 << 22, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
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void RSAZ_1024_mod_exp_avx2(BN_ULONG result_norm[16],
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const BN_ULONG base_norm[16],
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const BN_ULONG exponent[16],
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const BN_ULONG m_norm[16], const BN_ULONG RR[16],
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BN_ULONG k0,
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BN_ULONG storage[MOD_EXP_CTIME_STORAGE_LEN]) {
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OPENSSL_STATIC_ASSERT(MOD_EXP_CTIME_ALIGN % 64 == 0,
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MOD_EXP_CTIME_ALIGN_is_too_small)
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assert((uintptr_t)storage % 64 == 0);
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BN_ULONG *a_inv, *m, *result, *table_s = storage + 40 * 3, *R2 = table_s;
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// Note |R2| aliases |table_s|.
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if (((((uintptr_t)storage & 4095) + 320) >> 12) != 0) {
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result = storage;
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a_inv = storage + 40;
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m = storage + 40 * 2; // should not cross page
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} else {
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m = storage; // should not cross page
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result = storage + 40;
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a_inv = storage + 40 * 2;
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}
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rsaz_1024_norm2red_avx2(m, m_norm);
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rsaz_1024_norm2red_avx2(a_inv, base_norm);
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rsaz_1024_norm2red_avx2(R2, RR);
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// Convert |R2| from the usual radix, giving R = 2^1024, to RSAZ's radix,
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// giving R = 2^(36*29) = 2^1044.
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rsaz_1024_mul_avx2(R2, R2, R2, m, k0);
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// R2 = 2^2048 * 2^2048 / 2^1044 = 2^3052
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rsaz_1024_mul_avx2(R2, R2, rsaz_two80, m, k0);
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// R2 = 2^3052 * 2^80 / 2^1044 = 2^2088 = (2^1044)^2
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// table[0] = 1
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// table[1] = a_inv^1
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rsaz_1024_mul_avx2(result, R2, rsaz_one, m, k0);
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rsaz_1024_mul_avx2(a_inv, a_inv, R2, m, k0);
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rsaz_1024_scatter5_avx2(table_s, result, 0);
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rsaz_1024_scatter5_avx2(table_s, a_inv, 1);
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// table[2] = a_inv^2
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rsaz_1024_sqr_avx2(result, a_inv, m, k0, 1);
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rsaz_1024_scatter5_avx2(table_s, result, 2);
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// table[4] = a_inv^4
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rsaz_1024_sqr_avx2(result, result, m, k0, 1);
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rsaz_1024_scatter5_avx2(table_s, result, 4);
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// table[8] = a_inv^8
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rsaz_1024_sqr_avx2(result, result, m, k0, 1);
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rsaz_1024_scatter5_avx2(table_s, result, 8);
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// table[16] = a_inv^16
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rsaz_1024_sqr_avx2(result, result, m, k0, 1);
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rsaz_1024_scatter5_avx2(table_s, result, 16);
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for (int i = 3; i < 32; i += 2) {
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// table[i] = table[i-1] * a_inv = a_inv^i
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rsaz_1024_gather5_avx2(result, table_s, i - 1);
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rsaz_1024_mul_avx2(result, result, a_inv, m, k0);
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rsaz_1024_scatter5_avx2(table_s, result, i);
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for (int j = 2 * i; j < 32; j *= 2) {
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// table[j] = table[j/2]^2 = a_inv^j
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rsaz_1024_sqr_avx2(result, result, m, k0, 1);
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rsaz_1024_scatter5_avx2(table_s, result, j);
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}
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}
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// Load the first window.
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const uint8_t *p_str = (const uint8_t *)exponent;
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int wvalue = p_str[127] >> 3;
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rsaz_1024_gather5_avx2(result, table_s, wvalue);
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int index = 1014;
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while (index > -1) { // Loop for the remaining 127 windows.
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rsaz_1024_sqr_avx2(result, result, m, k0, 5);
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uint16_t wvalue_16;
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memcpy(&wvalue_16, &p_str[index / 8], sizeof(wvalue_16));
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wvalue = wvalue_16;
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wvalue = (wvalue >> (index % 8)) & 31;
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index -= 5;
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rsaz_1024_gather5_avx2(a_inv, table_s, wvalue); // Borrow |a_inv|.
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rsaz_1024_mul_avx2(result, result, a_inv, m, k0);
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}
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// Square four times.
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rsaz_1024_sqr_avx2(result, result, m, k0, 4);
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wvalue = p_str[0] & 15;
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rsaz_1024_gather5_avx2(a_inv, table_s, wvalue); // Borrow |a_inv|.
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rsaz_1024_mul_avx2(result, result, a_inv, m, k0);
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// Convert from Montgomery.
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rsaz_1024_mul_avx2(result, result, rsaz_one, m, k0);
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rsaz_1024_red2norm_avx2(result_norm, result);
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BN_ULONG scratch[16];
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bn_reduce_once_in_place(result_norm, /*carry=*/0, m_norm, scratch, 16);
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OPENSSL_cleanse(storage, MOD_EXP_CTIME_STORAGE_LEN * sizeof(BN_ULONG));
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}
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#endif // RSAZ_ENABLED
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