1 // SPDX-License-Identifier: GPL-2.0-or-later 1
2 /* mpihelp-sub.c - MPI helper functions
3 * Copyright (C) 1994, 1996 Free Software
4 * Copyright (C) 1998, 1999, 2000, 2001 F
5 *
6 * This file is part of GnuPG.
7 *
8 * Note: This code is heavily based on the GNU
9 * Actually it's the same code with only
10 * way the data is stored; this is to su
11 * of an optional secure memory allocati
12 * to avoid revealing of sensitive data
13 * The GNU MP Library itself is publishe
14 * however I decided to publish this cod
15 */
16
17 #include "mpi-internal.h"
18
19 /****************
20 * Compare OP1_PTR/OP1_SIZE with OP2_PTR/OP2_S
21 * There are no restrictions on the relative s
22 * the two arguments.
23 * Return 1 if OP1 > OP2, 0 if they are equal,
24 */
25 int mpihelp_cmp(mpi_ptr_t op1_ptr, mpi_ptr_t o
26 {
27 mpi_size_t i;
28 mpi_limb_t op1_word, op2_word;
29
30 for (i = size - 1; i >= 0; i--) {
31 op1_word = op1_ptr[i];
32 op2_word = op2_ptr[i];
33 if (op1_word != op2_word)
34 goto diff;
35 }
36 return 0;
37
38 diff:
39 /* This can *not* be simplified to
40 * op2_word - op2_word
41 * since that expression might give si
42 return (op1_word > op2_word) ? 1 : -1;
43 }
44
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