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comparison etc/mont.c @ 1:22d5cf7d4b1a libtommath

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Renaming branch
author Matt Johnston <matt@ucc.asn.au>
date Mon, 31 May 2004 18:23:46 +0000
parents
children 97db060d0ef5
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-1:000000000000 1:22d5cf7d4b1a
1 /* tests the montgomery routines */
2 #include <tommath.h>
3
4 int main(void)
5 {
6 mp_int modulus, R, p, pp;
7 mp_digit mp;
8 long x, y;
9
10 srand(time(NULL));
11 mp_init_multi(&modulus, &R, &p, &pp, NULL);
12
13 /* loop through various sizes */
14 for (x = 4; x < 256; x++) {
15 printf("DIGITS == %3ld...", x); fflush(stdout);
16
17 /* make up the odd modulus */
18 mp_rand(&modulus, x);
19 modulus.dp[0] |= 1;
20
21 /* now find the R value */
22 mp_montgomery_calc_normalization(&R, &modulus);
23 mp_montgomery_setup(&modulus, &mp);
24
25 /* now run through a bunch tests */
26 for (y = 0; y < 1000; y++) {
27 mp_rand(&p, x/2); /* p = random */
28 mp_mul(&p, &R, &pp); /* pp = R * p */
29 mp_montgomery_reduce(&pp, &modulus, mp);
30
31 /* should be equal to p */
32 if (mp_cmp(&pp, &p) != MP_EQ) {
33 printf("FAILURE!\n");
34 exit(-1);
35 }
36 }
37 printf("PASSED\n");
38 }
39
40 return 0;
41 }
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