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712d9cc90e
This reverts commit 0d40ca47bd.
It was found that the computation produces incorrect results in some
cases.
Reviewed-by: Dmitry Belyavskiy <beldmit@gmail.com>
Reviewed-by: Paul Dale <pauli@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/18512)
39 lines
1.4 KiB
C
39 lines
1.4 KiB
C
/*
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* Copyright 2009-2022 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the Apache License 2.0 (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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#include <openssl/crypto.h>
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#include <openssl/bn.h>
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#include "crypto/ppc_arch.h"
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#include "bn_local.h"
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int bn_mul_mont(BN_ULONG *rp, const BN_ULONG *ap, const BN_ULONG *bp,
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const BN_ULONG *np, const BN_ULONG *n0, int num)
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{
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int bn_mul_mont_int(BN_ULONG *rp, const BN_ULONG *ap, const BN_ULONG *bp,
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const BN_ULONG *np, const BN_ULONG *n0, int num);
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int bn_mul4x_mont_int(BN_ULONG *rp, const BN_ULONG *ap, const BN_ULONG *bp,
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const BN_ULONG *np, const BN_ULONG *n0, int num);
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if (num < 4)
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return 0;
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if ((num & 3) == 0)
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return bn_mul4x_mont_int(rp, ap, bp, np, n0, num);
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/*
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* There used to be [optional] call to bn_mul_mont_fpu64 here,
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* but above subroutine is faster on contemporary processors.
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* Formulation means that there might be old processors where
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* FPU code path would be faster, POWER6 perhaps, but there was
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* no opportunity to figure it out...
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*/
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return bn_mul_mont_int(rp, ap, bp, np, n0, num);
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}
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