| 1 | /*
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| 2 | * Copyright 2009-2022 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the Apache License 2.0 (the "License"). You may not use
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| 5 | * this file except in compliance with the License. You can obtain a copy
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| 6 | * in the file LICENSE in the source distribution or at
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| 7 | * https://www.openssl.org/source/license.html
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| 8 | */
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| 9 |
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| 10 | #include <openssl/crypto.h>
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| 11 | #include <openssl/bn.h>
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| 12 | #include "crypto/ppc_arch.h"
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| 13 | #include "bn_local.h"
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| 14 |
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| 15 | int bn_mul_mont(BN_ULONG *rp, const BN_ULONG *ap, const BN_ULONG *bp,
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| 16 | const BN_ULONG *np, const BN_ULONG *n0, int num)
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| 17 | {
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| 18 | int bn_mul_mont_int(BN_ULONG *rp, const BN_ULONG *ap, const BN_ULONG *bp,
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| 19 | const BN_ULONG *np, const BN_ULONG *n0, int num);
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| 20 | int bn_mul4x_mont_int(BN_ULONG *rp, const BN_ULONG *ap, const BN_ULONG *bp,
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| 21 | const BN_ULONG *np, const BN_ULONG *n0, int num);
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| 22 | int bn_mul_mont_fixed_n6(BN_ULONG *rp, const BN_ULONG *ap,
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| 23 | const BN_ULONG *bp, const BN_ULONG *np,
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| 24 | const BN_ULONG *n0, int num);
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| 25 | int bn_mul_mont_300_fixed_n6(BN_ULONG *rp, const BN_ULONG *ap,
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| 26 | const BN_ULONG *bp, const BN_ULONG *np,
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| 27 | const BN_ULONG *n0, int num);
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| 28 |
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| 29 | if (num < 4)
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| 30 | return 0;
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| 31 |
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| 32 | if ((num & 3) == 0)
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| 33 | return bn_mul4x_mont_int(rp, ap, bp, np, n0, num);
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| 34 |
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| 35 | /*
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| 36 | * There used to be [optional] call to bn_mul_mont_fpu64 here,
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| 37 | * but above subroutine is faster on contemporary processors.
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| 38 | * Formulation means that there might be old processors where
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| 39 | * FPU code path would be faster, POWER6 perhaps, but there was
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| 40 | * no opportunity to figure it out...
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| 41 | */
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| 42 |
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| 43 | #if defined(_ARCH_PPC64) && !defined(__ILP32__)
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| 44 | if (num == 6) {
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| 45 | if (OPENSSL_ppccap_P & PPC_MADD300)
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| 46 | return bn_mul_mont_300_fixed_n6(rp, ap, bp, np, n0, num);
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| 47 | else
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| 48 | return bn_mul_mont_fixed_n6(rp, ap, bp, np, n0, num);
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| 49 | }
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| 50 | #endif
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| 51 |
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| 52 | return bn_mul_mont_int(rp, ap, bp, np, n0, num);
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| 53 | }
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