michael@0: /*
michael@0:  * Simple test driver for MPI library
michael@0:  *
michael@0:  * Test 4: Modular arithmetic tests
michael@0:  *
michael@0:  * This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #include <stdio.h>
michael@0: #include <stdlib.h>
michael@0: #include <string.h>
michael@0: #include <ctype.h>
michael@0: #include <limits.h>
michael@0: 
michael@0: #include "mpi.h"
michael@0: 
michael@0: int main(int argc, char *argv[])
michael@0: {
michael@0:   int      ix;
michael@0:   mp_int   a, b, c, m;
michael@0:   mp_digit r;
michael@0: 
michael@0:   if(argc < 4) {
michael@0:     fprintf(stderr, "Usage: %s <a> <b> <m>\n", argv[0]);
michael@0:     return 1;
michael@0:   }
michael@0: 
michael@0:   printf("Test 4: Modular arithmetic\n\n");
michael@0: 
michael@0:   mp_init(&a);
michael@0:   mp_init(&b);
michael@0:   mp_init(&m);
michael@0: 
michael@0:   mp_read_radix(&a, argv[1], 10);
michael@0:   mp_read_radix(&b, argv[2], 10);
michael@0:   mp_read_radix(&m, argv[3], 10);
michael@0:   printf("a = "); mp_print(&a, stdout); fputc('\n', stdout);
michael@0:   printf("b = "); mp_print(&b, stdout); fputc('\n', stdout);
michael@0:   printf("m = "); mp_print(&m, stdout); fputc('\n', stdout);
michael@0:   
michael@0:   mp_init(&c);
michael@0:   printf("\nc = a (mod m)\n");
michael@0: 
michael@0:   mp_mod(&a, &m, &c);
michael@0:   printf("c = "); mp_print(&c, stdout); fputc('\n', stdout);
michael@0: 
michael@0:   printf("\nc = b (mod m)\n");
michael@0: 
michael@0:   mp_mod(&b, &m, &c);
michael@0:   printf("c = "); mp_print(&c, stdout); fputc('\n', stdout);
michael@0: 
michael@0:   printf("\nc = b (mod 1853)\n");
michael@0: 
michael@0:   mp_mod_d(&b, 1853, &r);
michael@0:   printf("c = %04X\n", r);
michael@0: 
michael@0:   printf("\nc = (a + b) mod m\n");
michael@0: 
michael@0:   mp_addmod(&a, &b, &m, &c);
michael@0:   printf("c = "); mp_print(&c, stdout); fputc('\n', stdout);
michael@0: 
michael@0:   printf("\nc = (a - b) mod m\n");
michael@0: 
michael@0:   mp_submod(&a, &b, &m, &c);
michael@0:   printf("c = "); mp_print(&c, stdout); fputc('\n', stdout);
michael@0: 
michael@0:   printf("\nc = (a * b) mod m\n");
michael@0: 
michael@0:   mp_mulmod(&a, &b, &m, &c);
michael@0:   printf("c = "); mp_print(&c, stdout); fputc('\n', stdout);
michael@0: 
michael@0:   printf("\nc = (a ** b) mod m\n");
michael@0: 
michael@0:   mp_exptmod(&a, &b, &m, &c);
michael@0:   printf("c = "); mp_print(&c, stdout); fputc('\n', stdout);
michael@0: 
michael@0:   printf("\nIn-place modular squaring test:\n");
michael@0:   for(ix = 0; ix < 5; ix++) {
michael@0:     printf("a = (a * a) mod m   a = ");
michael@0:     mp_sqrmod(&a, &m, &a);
michael@0:     mp_print(&a, stdout);
michael@0:     fputc('\n', stdout);
michael@0:   }
michael@0:   
michael@0: 
michael@0:   mp_clear(&c);
michael@0:   mp_clear(&m);
michael@0:   mp_clear(&b);
michael@0:   mp_clear(&a);
michael@0: 
michael@0:   return 0;
michael@0: }