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make sure the entire mp_digit is filled with random data

This commit is contained in:
Steffen Jaeckel 2016-04-10 01:01:29 +02:00
parent 2e1446f936
commit 7cf5c050e2
1 changed files with 14 additions and 2 deletions
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16
bn_mp_rand.c
View File

@ -16,6 +16,18 @@
*/
/* makes a pseudo-random int of a given size */
static mp_digit mp_gen_random(void)
{
mp_digit d;
d = ((mp_digit) abs (MP_GEN_RANDOM()));
#if MP_DIGIT_BIT > 32
d <<= 32;
d |= ((mp_digit) abs (MP_GEN_RANDOM()));
#endif
d &= MP_MASK;
return d;
}
int
mp_rand (mp_int * a, int digits)
{
@ -29,7 +41,7 @@ mp_rand (mp_int * a, int digits)
/* first place a random non-zero digit */
do {
d = ((mp_digit) abs (MP_GEN_RANDOM())) & MP_MASK;
d = mp_gen_random();
} while (d == 0);
if ((res = mp_add_d (a, d, a)) != MP_OKAY) {
@ -41,7 +53,7 @@ mp_rand (mp_int * a, int digits)
return res;
}
if ((res = mp_add_d (a, ((mp_digit) abs (MP_GEN_RANDOM())), a)) != MP_OKAY) {
if ((res = mp_add_d (a, mp_gen_random(), a)) != MP_OKAY) {
return res;
}
}