Mercurial > dropbear

annotate libtommath/etc/mont.c @ 902:2351b2da8e0d DROPBEAR_2014.63

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2014.63
author Matt Johnston <matt@ucc.asn.au>
date Wed, 19 Feb 2014 22:04:35 +0800
parents 5ff8218bcee9
children 60fc6476e044
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /* tests the montgomery routines */
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2 #include <tommath.h>
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3
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4 int main(void)
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5 {
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6 mp_int modulus, R, p, pp;
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7 mp_digit mp;
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8 long x, y;
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9
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10 srand(time(NULL));
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11 mp_init_multi(&modulus, &R, &p, &pp, NULL);
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12
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13 /* loop through various sizes */
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14 for (x = 4; x < 256; x++) {
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15 printf("DIGITS == %3ld...", x); fflush(stdout);
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16
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17 /* make up the odd modulus */
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18 mp_rand(&modulus, x);
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19 modulus.dp[0] |= 1;
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20
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21 /* now find the R value */
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22 mp_montgomery_calc_normalization(&R, &modulus);
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23 mp_montgomery_setup(&modulus, &mp);
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24
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25 /* now run through a bunch tests */
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26 for (y = 0; y < 1000; y++) {
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27 mp_rand(&p, x/2); /* p = random */
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28 mp_mul(&p, &R, &pp); /* pp = R * p */
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29 mp_montgomery_reduce(&pp, &modulus, mp);
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30
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31 /* should be equal to p */
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32 if (mp_cmp(&pp, &p) != MP_EQ) {
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33 printf("FAILURE!\n");
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34 exit(-1);
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35 }
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36 }
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37 printf("PASSED\n");
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38 }
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39
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40 return 0;
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41 }
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46
389
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47
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48 /* $Source: /cvs/libtom/libtommath/etc/mont.c,v $ */
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49 /* $Revision: 1.2 $ */
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50 /* $Date: 2005/05/05 14:38:47 $ */