forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
43 lines
1.3 KiB
43 lines
1.3 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
|
/* mpihelp-sub.c - MPI helper functions |
|
* Copyright (C) 1994, 1996 Free Software Foundation, Inc. |
|
* Copyright (C) 1998, 1999, 2000, 2001 Free Software Foundation, Inc. |
|
* |
|
* This file is part of GnuPG. |
|
* |
|
* Note: This code is heavily based on the GNU MP Library. |
|
* Actually it's the same code with only minor changes in the |
|
* way the data is stored; this is to support the abstraction |
|
* of an optional secure memory allocation which may be used |
|
* to avoid revealing of sensitive data due to paging etc. |
|
* The GNU MP Library itself is published under the LGPL; |
|
* however I decided to publish this code under the plain GPL. |
|
*/ |
|
|
|
#include "mpi-internal.h" |
|
|
|
/**************** |
|
* Compare OP1_PTR/OP1_SIZE with OP2_PTR/OP2_SIZE. |
|
* There are no restrictions on the relative sizes of |
|
* the two arguments. |
|
* Return 1 if OP1 > OP2, 0 if they are equal, and -1 if OP1 < OP2. |
|
*/ |
|
int mpihelp_cmp(mpi_ptr_t op1_ptr, mpi_ptr_t op2_ptr, mpi_size_t size) |
|
{ |
|
mpi_size_t i; |
|
mpi_limb_t op1_word, op2_word; |
|
|
|
for (i = size - 1; i >= 0; i--) { |
|
op1_word = op1_ptr[i]; |
|
op2_word = op2_ptr[i]; |
|
if (op1_word != op2_word) |
|
goto diff; |
|
} |
|
return 0; |
|
|
|
diff: |
|
/* This can *not* be simplified to |
|
* op2_word - op2_word |
|
* since that expression might give signed overflow. */ |
|
return (op1_word > op2_word) ? 1 : -1; |
|
}
|
|
|