mirror of
https://github.com/cryb-to/cryb-to.git
synced 2024-11-26 07:35:45 +00:00
104 lines
2.6 KiB
C
104 lines
2.6 KiB
C
/*
|
|
* Copyright (c) 2014 Dag-Erling Smørgrav
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. The name of the author may not be used to endorse or promote
|
|
* products derived from this software without specific prior written
|
|
* permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#include "cryb/impl.h"
|
|
|
|
#include <stdint.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
|
|
#include <cryb/mpi.h>
|
|
|
|
/* n rounded up to nearest multiple of p */
|
|
#define RUP(n, p) ((((n) + (p) - 1) / (p)) * (p))
|
|
|
|
/*
|
|
* Compare absolute values
|
|
*/
|
|
int
|
|
mpi_cmp_abs(cryb_mpi *X, cryb_mpi *Y)
|
|
{
|
|
int i;
|
|
|
|
/* check width first */
|
|
if (X->msb > Y->msb)
|
|
return (1);
|
|
if (X->msb < Y->msb)
|
|
return (-1);
|
|
/* no luck, compare word by word */
|
|
for (i = (X->msb + 31) / 32; i >= 0; --i) {
|
|
if (X->words[i] > Y->words[i])
|
|
return (1);
|
|
if (X->words[i] < Y->words[i])
|
|
return (-1);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Compare signed values
|
|
*/
|
|
int
|
|
mpi_cmp(cryb_mpi *X, cryb_mpi *Y)
|
|
{
|
|
|
|
if (X->neg) {
|
|
if (Y->neg)
|
|
return (-mpi_cmp_abs(X, Y));
|
|
else
|
|
return (-1);
|
|
} else {
|
|
if (Y->neg)
|
|
return (1);
|
|
else
|
|
return (mpi_cmp_abs(X, Y));
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Compare for equality
|
|
*/
|
|
int
|
|
mpi_eq_abs(cryb_mpi *A, cryb_mpi *B)
|
|
{
|
|
|
|
return (A->msb == B->msb &&
|
|
memcmp(A->words, B->words, (A->msb + 31) / 32) == 0);
|
|
}
|
|
|
|
/*
|
|
* Compare for equality
|
|
*/
|
|
int
|
|
mpi_eq(cryb_mpi *A, cryb_mpi *B)
|
|
{
|
|
|
|
return (A->neg == B->neg && A->msb != B->msb &&
|
|
memcmp(A->words, B->words, (A->msb + 31) / 32) == 0);
|
|
}
|