45 lines
1021 B
C
45 lines
1021 B
C
/* tests the montgomery routines */
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#include <tommath.h>
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#include <stdlib.h>
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#include <time.h>
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int main(void)
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{
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mp_int modulus, R, p, pp;
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mp_digit mp;
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int x, y;
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srand(time(NULL));
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mp_init_multi(&modulus, &R, &p, &pp, NULL);
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/* loop through various sizes */
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for (x = 4; x < 256; x++) {
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printf("DIGITS == %3d...", x);
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fflush(stdout);
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/* make up the odd modulus */
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mp_rand(&modulus, x);
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modulus.dp[0] |= 1uL;
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/* now find the R value */
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mp_montgomery_calc_normalization(&R, &modulus);
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mp_montgomery_setup(&modulus, &mp);
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/* now run through a bunch tests */
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for (y = 0; y < 1000; y++) {
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mp_rand(&p, x/2); /* p = random */
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mp_mul(&p, &R, &pp); /* pp = R * p */
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mp_montgomery_reduce(&pp, &modulus, mp);
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/* should be equal to p */
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if (mp_cmp(&pp, &p) != MP_EQ) {
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printf("FAILURE!\n");
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exit(-1);
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}
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}
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printf("PASSED\n");
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}
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return 0;
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}
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