ab578adf44
As part of this, move the CPU checks to C. Change-Id: I17b701e1196c1ca116bbd23e0e669cf603ad464d Reviewed-on: https://boringssl-review.googlesource.com/c/34626 Reviewed-by: Adam Langley <agl@google.com> Commit-Queue: David Benjamin <davidben@google.com>
105 lines
4.0 KiB
C
105 lines
4.0 KiB
C
/*
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* 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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* Licensed under the OpenSSL license (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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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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#ifndef OPENSSL_HEADER_BN_RSAZ_EXP_H
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#define OPENSSL_HEADER_BN_RSAZ_EXP_H
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#include <openssl/bn.h>
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#include <openssl/cpu.h>
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#include "internal.h"
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#if defined(__cplusplus)
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extern "C" {
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#endif
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#if !defined(OPENSSL_NO_ASM) && defined(OPENSSL_X86_64)
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#define RSAZ_ENABLED
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// RSAZ_1024_mod_exp_avx2 sets |result| to |base_norm| raised to |exponent|
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// modulo |m_norm|. |base_norm| must be fully-reduced and |exponent| must have
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// the high bit set (it is 1024 bits wide). |RR| and |k0| must be |RR| and |n0|,
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// respectively, extracted from |m_norm|'s |BN_MONT_CTX|. |storage_words| is a
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// temporary buffer that must be aligned to |MOD_EXP_CTIME_MIN_CACHE_LINE_WIDTH|
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// bytes.
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void RSAZ_1024_mod_exp_avx2(BN_ULONG result[16], 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_words[MOD_EXP_CTIME_STORAGE_LEN]);
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OPENSSL_INLINE int rsaz_avx2_capable(void) {
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const uint32_t *cap = OPENSSL_ia32cap_get();
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return (cap[2] & (1 << 5)) != 0; // AVX2
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}
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OPENSSL_INLINE int rsaz_avx2_preferred(void) {
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const uint32_t *cap = OPENSSL_ia32cap_get();
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static const uint32_t kBMI2AndADX = (1 << 8) | (1 << 19);
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if ((cap[2] & kBMI2AndADX) == kBMI2AndADX) {
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// If BMI2 and ADX are available, x86_64-mont5.pl is faster.
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return 0;
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}
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return (cap[2] & (1 << 5)) != 0; // AVX2
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}
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// Assembly functions.
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// RSAZ represents 1024-bit integers using unsaturated 29-bit limbs stored in
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// 64-bit integers. This requires 36 limbs but padded up to 40.
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//
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// See crypto/bn/asm/rsaz-avx2.pl for further details.
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// rsaz_1024_norm2red_avx2 converts |norm| from |BIGNUM| to RSAZ representation
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// and writes the result to |red|.
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void rsaz_1024_norm2red_avx2(BN_ULONG red[40], const BN_ULONG norm[16]);
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// rsaz_1024_mul_avx2 computes |a| * |b| mod |n| and writes the result to |ret|.
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// Inputs and outputs are in Montgomery form, using RSAZ's representation. |k|
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// is -|n|^-1 mod 2^64 or |n0| from |BN_MONT_CTX|.
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void rsaz_1024_mul_avx2(BN_ULONG ret[40], const BN_ULONG a[40],
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const BN_ULONG b[40], const BN_ULONG n[40], BN_ULONG k);
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// rsaz_1024_mul_avx2 computes |a|^(2*|count|) mod |n| and writes the result to
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// |ret|. Inputs and outputs are in Montgomery form, using RSAZ's
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// representation. |k| is -|n|^-1 mod 2^64 or |n0| from |BN_MONT_CTX|.
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void rsaz_1024_sqr_avx2(BN_ULONG ret[40], const BN_ULONG a[40],
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const BN_ULONG n[40], BN_ULONG k, int count);
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// rsaz_1024_scatter5_avx2 stores |val| at index |i| of |tbl|. |i| must be
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// positive and at most 31. Note the table only uses 18 |BN_ULONG|s per entry
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// instead of 40. It packs two 29-bit limbs into each |BN_ULONG| and only stores
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// 36 limbs rather than the padded 40.
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void rsaz_1024_scatter5_avx2(BN_ULONG tbl[32 * 18], const BN_ULONG val[40],
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int i);
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// rsaz_1024_gather5_avx2 loads index |i| of |tbl| and writes it to |val|.
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void rsaz_1024_gather5_avx2(BN_ULONG val[40], const BN_ULONG tbl[32 * 18],
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int i);
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// rsaz_1024_red2norm_avx2 converts |red| from RSAZ to |BIGNUM| representation
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// and writes the result to |norm|.
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void rsaz_1024_red2norm_avx2(BN_ULONG norm[16], const BN_ULONG red[40]);
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#endif // !OPENSSL_NO_ASM && OPENSSL_X86_64
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#if defined(__cplusplus)
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} // extern "C"
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#endif
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#endif // OPENSSL_HEADER_BN_RSAZ_EXP_H
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