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/*
* Copyright 2020-2021 The OpenSSL Project Authors. All Rights Reserved.
* Copyright (c) 2020-2021, Intel Corporation. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*
*
* Originally written by Sergey Kirillov and Andrey Matyukov.
* Special thanks to Ilya Albrekht for his valuable hints.
* Intel Corporation
*
*/
#include <openssl/opensslconf.h>
#include <openssl/crypto.h>
#include "rsaz_exp.h"
#ifndef RSAZ_ENABLED
NON_EMPTY_TRANSLATION_UNIT
#else
# include <assert.h>
# include <string.h>
# if defined(__GNUC__)
# define ALIGN64 __attribute__((aligned(64)))
# elif defined(_MSC_VER)
# define ALIGN64 __declspec(align(64))
# else
# define ALIGN64
# endif
# define ALIGN_OF(ptr, boundary) \
((unsigned char *)(ptr) + (boundary - (((size_t)(ptr)) & (boundary - 1))))
/* Internal radix */
# define DIGIT_SIZE (52)
/* 52-bit mask */
# define DIGIT_MASK ((uint64_t)0xFFFFFFFFFFFFF)
# define BITS2WORD8_SIZE(x) (((x) + 7) >> 3)
# define BITS2WORD64_SIZE(x) (((x) + 63) >> 6)
/* Number of registers required to hold |digits_num| amount of qword digits */
# define NUMBER_OF_REGISTERS(digits_num, register_size) \
(((digits_num) * 64 + (register_size) - 1) / (register_size))
static ossl_inline uint64_t get_digit(const uint8_t *in, int in_len);
static ossl_inline void put_digit(uint8_t *out, int out_len, uint64_t digit);
static void to_words52(BN_ULONG *out, int out_len, const BN_ULONG *in,
int in_bitsize);
static void from_words52(BN_ULONG *bn_out, int out_bitsize, const BN_ULONG *in);
static ossl_inline void set_bit(BN_ULONG *a, int idx);
/* Number of |digit_size|-bit digits in |bitsize|-bit value */
static ossl_inline int number_of_digits(int bitsize, int digit_size)
{
return (bitsize + digit_size - 1) / digit_size;
}
/*
* For details of the methods declared below please refer to
* crypto/bn/asm/rsaz-avx512.pl
*
* Naming conventions:
* amm = Almost Montgomery Multiplication
* ams = Almost Montgomery Squaring
* 52xZZ - data represented as array of ZZ digits in 52-bit radix
* _x1_/_x2_ - 1 or 2 independent inputs/outputs
* _ifma256 - uses 256-bit wide IFMA ISA (AVX512_IFMA256)
*/
void ossl_rsaz_amm52x20_x1_ifma256(BN_ULONG *res, const BN_ULONG *a,
const BN_ULONG *b, const BN_ULONG *m,
BN_ULONG k0);
void ossl_rsaz_amm52x20_x2_ifma256(BN_ULONG *out, const BN_ULONG *a,
const BN_ULONG *b, const BN_ULONG *m,
const BN_ULONG k0[2]);
void ossl_extract_multiplier_2x20_win5(BN_ULONG *red_Y,
const BN_ULONG *red_table,
int red_table_idx1, int red_table_idx2);
void ossl_rsaz_amm52x30_x1_ifma256(BN_ULONG *res, const BN_ULONG *a,
const BN_ULONG *b, const BN_ULONG *m,
BN_ULONG k0);
void ossl_rsaz_amm52x30_x2_ifma256(BN_ULONG *out, const BN_ULONG *a,
const BN_ULONG *b, const BN_ULONG *m,
const BN_ULONG k0[2]);
void ossl_extract_multiplier_2x30_win5(BN_ULONG *red_Y,
const BN_ULONG *red_table,
int red_table_idx1, int red_table_idx2);
void ossl_rsaz_amm52x40_x1_ifma256(BN_ULONG *res, const BN_ULONG *a,
const BN_ULONG *b, const BN_ULONG *m,
BN_ULONG k0);
void ossl_rsaz_amm52x40_x2_ifma256(BN_ULONG *out, const BN_ULONG *a,
const BN_ULONG *b, const BN_ULONG *m,
const BN_ULONG k0[2]);
void ossl_extract_multiplier_2x40_win5(BN_ULONG *red_Y,
const BN_ULONG *red_table,
int red_table_idx1, int red_table_idx2);
static int RSAZ_mod_exp_x2_ifma256(BN_ULONG *res, const BN_ULONG *base,
const BN_ULONG *exp[2], const BN_ULONG *m,
const BN_ULONG *rr, const BN_ULONG k0[2],
int modulus_bitsize);
/*
* Dual Montgomery modular exponentiation using prime moduli of the
* same bit size, optimized with AVX512 ISA.
*
* Input and output parameters for each exponentiation are independent and
* denoted here by index |i|, i = 1..2.
*
* Input and output are all in regular 2^64 radix.
*
* Each moduli shall be |factor_size| bit size.
*
* Supported cases:
* - 2x1024
* - 2x1536
* - 2x2048
*
* [out] res|i| - result of modular exponentiation: array of qword values
* in regular (2^64) radix. Size of array shall be enough
* to hold |factor_size| bits.
* [in] base|i| - base
* [in] exp|i| - exponent
* [in] m|i| - moduli
* [in] rr|i| - Montgomery parameter RR = R^2 mod m|i|
* [in] k0_|i| - Montgomery parameter k0 = -1/m|i| mod 2^64
* [in] factor_size - moduli bit size
*
* \return 0 in case of failure,
* 1 in case of success.
*/
int ossl_rsaz_mod_exp_avx512_x2(BN_ULONG *res1,
const BN_ULONG *base1,
const BN_ULONG *exp1,
const BN_ULONG *m1,
const BN_ULONG *rr1,
BN_ULONG k0_1,
BN_ULONG *res2,
const BN_ULONG *base2,
const BN_ULONG *exp2,
const BN_ULONG *m2,
const BN_ULONG *rr2,
BN_ULONG k0_2,
int factor_size)
{
typedef void (*AMM)(BN_ULONG *res, const BN_ULONG *a,
const BN_ULONG *b, const BN_ULONG *m, BN_ULONG k0);
int ret = 0;
/*
* Number of word-size (BN_ULONG) digits to store exponent in redundant
* representation.
*/
int exp_digits = number_of_digits(factor_size + 2, DIGIT_SIZE);
int coeff_pow = 4 * (DIGIT_SIZE * exp_digits - factor_size);
/* Number of YMM registers required to store exponent's digits */
int ymm_regs_num = NUMBER_OF_REGISTERS(exp_digits, 256 /* ymm bit size */);
/* Capacity of the register set (in qwords) to store exponent */
int regs_capacity = ymm_regs_num * 4;
BN_ULONG *base1_red, *m1_red, *rr1_red;
BN_ULONG *base2_red, *m2_red, *rr2_red;
BN_ULONG *coeff_red;
BN_ULONG *storage = NULL;
BN_ULONG *storage_aligned = NULL;
int storage_len_bytes = 7 * regs_capacity * sizeof(BN_ULONG)
+ 64 /* alignment */;
const BN_ULONG *exp[2] = {0};
BN_ULONG k0[2] = {0};
/* AMM = Almost Montgomery Multiplication */
AMM amm = NULL;
switch (factor_size) {
case 1024:
amm = ossl_rsaz_amm52x20_x1_ifma256;
break;
case 1536:
amm = ossl_rsaz_amm52x30_x1_ifma256;
break;
case 2048:
amm = ossl_rsaz_amm52x40_x1_ifma256;
break;
default:
goto err;
}
storage = (BN_ULONG *)OPENSSL_malloc(storage_len_bytes);
if (storage == NULL)
goto err;
storage_aligned = (BN_ULONG *)ALIGN_OF(storage, 64);
/* Memory layout for red(undant) representation
|