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104 lines
4.0 KiB
104 lines
4.0 KiB
/* |
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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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