src/usr.bin/ssh/dh.c - diff

Return to dh.c CVS log

Up to [local] / src / usr.bin / ssh

version 1.35, 2006/03/27 13:03:54

version 1.36, 2006/05/04 14:55:23

Line 181

int i;

int n = BN_num_bits(dh_pub);

int bits_set = 0;

BIGNUM *tmp;

if (dh_pub->neg) {

logit("invalid public DH value: negativ");

return 0;

}

if (BN_cmp(dh_pub, BN_value_one()) != 1) { /* pub_exp <= 1 */

logit("invalid public DH value: <= 1");

return 0;

}

if ((tmp = BN_new()) == NULL)

return (-1);

if (!BN_sub(tmp, dh->p, BN_value_one()) ||

BN_cmp(dh_pub, tmp) != -1) { /* pub_exp > p-2 */

BN_clear_free(tmp);

logit("invalid public DH value: >= p-1");

return 0;

}

BN_clear_free(tmp);

for (i = 0; i <= n; i++)

if (BN_is_bit_set(dh_pub, i))

bits_set++;

debug2("bits set: %d/%d", bits_set, BN_num_bits(dh->p));

/* if g==2 and bits_set==1 then computing log_g(dh_pub) is trivial */

if (bits_set > 1 && (BN_cmp(dh_pub, dh->p) == -1))

if (bits_set > 1)

return 1;

logit("invalid public DH value (%d/%d)", bits_set, BN_num_bits(dh->p));

return 0;

}