mirror of
https://github.com/cryb-to/cryb-to.git
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285 lines
9 KiB
C
285 lines
9 KiB
C
/*
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* Copyright (c) 2014-2017 Dag-Erling Smørgrav
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "cryb/impl.h"
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#include <stdint.h>
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#include <string.h>
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#include <unistd.h>
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#include <cryb/endian.h>
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#include <cryb/mpi.h>
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#include <cryb/test.h>
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#include "t_mpi.h"
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/***************************************************************************
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* Multiplication
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*/
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static struct t_mul_case {
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const char *desc;
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int err;
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uint8_t a[16];
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size_t amsb;
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int aneg:1;
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uint8_t b[16];
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size_t bmsb;
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int bneg:1;
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uint8_t e[16];
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size_t emsb;
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int eneg:1;
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} t_mul_cases[] = {
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{
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"0 * 0 == 0", 0,
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{ }, 0, 0,
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{ }, 0, 0,
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{ }, 0, 0,
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},
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{
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"0 * 1 == 0", 0,
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{ }, 0, 0,
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{ 0x01 }, 1, 0,
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{ }, 0, 0,
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},
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{
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"1 * 0 == 0", 0,
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{ 0x01 }, 1, 0,
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{ }, 0, 0,
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{ }, 0, 0,
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},
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{
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"1 * 1 == 1", 0,
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{ 0x01 }, 1, 0,
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{ 0x01 }, 1, 0,
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{ 0x01 }, 1, 0,
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},
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{
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"(2^32 + 1) * (2^32 + 1) == 2^64 + 2^33 + 1", 0,
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{ 0x01, 0x00, 0x00, 0x00, 0x01 }, 33, 0,
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{ 0x01, 0x00, 0x00, 0x00, 0x01 }, 33, 0,
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{ 0x01, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00, 0x01 }, 65, 0,
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},
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{
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"(2^32 + 1) * (2^32 - 1) == 2^64 - 1", 0,
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{ 0x01, 0x00, 0x00, 0x00, 0x01 }, 33, 0,
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{ 0xff, 0xff, 0xff, 0xff }, 32, 0,
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{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }, 63, 0,
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},
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{
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"(2^32 - 1) * (2^32 + 1) == 2^64 - 1", 0,
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{ 0xff, 0xff, 0xff, 0xff }, 32, 0,
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{ 0x01, 0x00, 0x00, 0x00, 0x01 }, 33, 0,
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{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }, 63, 0,
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},
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{
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"(2^32 - 1) * (2^32 - 1) == 2^64 - 2^33 + 1", 0,
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{ 0xff, 0xff, 0xff, 0xff }, 32, 0,
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{ 0xff, 0xff, 0xff, 0xff }, 32, 0,
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{ 0xff, 0xff, 0xff, 0xfe, 0x00, 0x00, 0x00, 0x01 }, 64, 0,
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},
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};
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static int
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t_mpi_mul_tc(char **desc CRYB_UNUSED, void *arg)
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{
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struct t_mul_case *tc = arg;
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cryb_mpi a = CRYB_MPI_ZERO, b = CRYB_MPI_ZERO, e = CRYB_MPI_ZERO;
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cryb_mpi x = CRYB_MPI_ZERO;
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int ret = 1;
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mpi_load(&a, tc->a, (tc->amsb + 7) / 8);
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a.neg = tc->aneg;
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mpi_load(&b, tc->b, (tc->bmsb + 7) / 8);
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b.neg = tc->bneg;
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mpi_load(&e, tc->e, (tc->emsb + 7) / 8);
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e.neg = tc->eneg;
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ret &= t_is_zero_i(mpi_mul_abs(&x, &a, &b));
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ret &= t_compare_mpi(&e, &x);
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mpi_destroy(&a);
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mpi_destroy(&b);
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mpi_destroy(&e);
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mpi_destroy(&x);
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return (ret);
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}
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/***************************************************************************
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* Division
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*/
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static struct t_div_case {
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const char *desc;
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int err;
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uint8_t a[16];
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size_t amsb;
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int aneg:1;
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uint8_t b[16];
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size_t bmsb;
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int bneg:1;
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uint8_t q[16];
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size_t qmsb;
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int qneg:1;
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uint8_t r[16];
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size_t rmsb;
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int rneg:1;
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} t_div_cases[] = {
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{
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/* divide something by zero */
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"1 / 0 == ERROR", -1,
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{ 0x01 }, 1, 0,
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{ }, 0, 0,
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{ }, 0, 0,
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{ }, 0, 0,
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},
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{
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/* divide zero by something */
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"0 / 1 == 0", 0,
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{ }, 0, 0,
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{ 0x01 }, 1, 0,
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{ }, 0, 0,
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{ }, 0, 0,
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},
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{
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/* divide something by one */
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"3 / 1 == 3", 0,
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{ 0x03 }, 2, 0,
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{ 0x01 }, 1, 0,
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{ 0x03 }, 2, 0,
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{ }, 0, 0,
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},
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{
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/* divide something by itself */
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"3 / 3 == 1", 0,
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{ 0x03 }, 2, 0,
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{ 0x03 }, 2, 0,
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{ 0x01 }, 1, 0,
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{ }, 0, 0,
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},
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{
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/* divide something by something larger */
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"127 / 254 == 0 rem 127", 0,
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{ 0x7f }, 7, 0,
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{ 0xfe }, 8, 0,
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{ }, 0, 0,
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{ 0x7f }, 7, 0,
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},
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{
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/* no remainder */
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"254 / 127 = 2", 0,
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{ 0xfe }, 8, 0,
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{ 0x7f }, 7, 0,
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{ 0x02 }, 2, 0,
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{ }, 0, 0,
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},
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{
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/* remainder */
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"257 / 127 == 2 rem 3", 0,
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{ 0x01, 0x01 }, 9, 0,
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{ 0x7f }, 7, 0,
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{ 0x02 }, 2, 0,
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{ 0x03 }, 2, 0,
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},
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/* XXX needs lots more tests! */
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};
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static int
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t_mpi_div_tc(char **desc CRYB_UNUSED, void *arg)
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{
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struct t_div_case *tc = arg;
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cryb_mpi a = CRYB_MPI_ZERO, b = CRYB_MPI_ZERO;
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cryb_mpi q = CRYB_MPI_ZERO, r = CRYB_MPI_ZERO;
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cryb_mpi eq = CRYB_MPI_ZERO, er = CRYB_MPI_ZERO;
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int ret = 1;
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mpi_load(&a, tc->a, (tc->amsb + 7) / 8);
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a.neg = tc->aneg;
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mpi_load(&b, tc->b, (tc->bmsb + 7) / 8);
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b.neg = tc->bneg;
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mpi_load(&eq, tc->q, (tc->qmsb + 7) / 8);
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eq.neg = tc->qneg;
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mpi_load(&er, tc->r, (tc->rmsb + 7) / 8);
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er.neg = tc->rneg;
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ret &= t_compare_i(tc->err, mpi_div_abs(&q, &r, &a, &b));
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if (tc->err == 0) {
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ret &= t_compare_mpi(&eq, &q);
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ret &= t_compare_mpi(&er, &r);
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}
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mpi_destroy(&a);
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mpi_destroy(&b);
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mpi_destroy(&q);
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mpi_destroy(&r);
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mpi_destroy(&eq);
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mpi_destroy(&er);
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return (ret);
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}
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/***************************************************************************
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* Boilerplate
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*/
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static int
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t_prepare(int argc, char *argv[])
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{
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unsigned int i;
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(void)argc;
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(void)argv;
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t_mpi_prepare();
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/* multiplication */
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for (i = 0; i < sizeof t_mul_cases / sizeof t_mul_cases[0]; ++i)
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t_add_test(t_mpi_mul_tc, &t_mul_cases[i],
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"%s", t_mul_cases[i].desc);
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/* division */
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for (i = 0; i < sizeof t_div_cases / sizeof t_div_cases[0]; ++i)
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t_add_test(t_mpi_div_tc, &t_div_cases[i],
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"%s", t_div_cases[i].desc);
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return (0);
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}
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static void
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t_cleanup(void)
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{
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t_mpi_cleanup();
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}
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int
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main(int argc, char *argv[])
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{
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t_main(t_prepare, t_cleanup, argc, argv);
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}
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