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