AuroraMiddleware/libtommath
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use arc4random() instead of rand() on *BSD

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This commit is contained in:
Carlin 2014-12-12 01:42:30 +13:00
parent 9d697d4686
commit 5d1096b0bd
2 changed files with 13 additions and 2 deletions
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4
bn_mp_rand.c
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@ -29,7 +29,7 @@ mp_rand (mp_int * a, int digits)
/* first place a random non-zero digit */
do {
d = ((mp_digit) abs (rand ())) & MP_MASK;
d = ((mp_digit) abs (MP_GEN_RANDOM())) & MP_MASK;
} while (d == 0);
if ((res = mp_add_d (a, d, a)) != MP_OKAY) {
@ -41,7 +41,7 @@ mp_rand (mp_int * a, int digits)
return res;
}
if ((res = mp_add_d (a, ((mp_digit) abs (rand ())), a)) != MP_OKAY) {
if ((res = mp_add_d (a, ((mp_digit) abs (MP_GEN_RANDOM())), a)) != MP_OKAY) {
return res;
}
}

11
tommath.h
View File

@ -138,6 +138,17 @@ extern "C" {
typedef mp_digit mp_min_u32;
#endif
/* platforms that can use a better rand function */
#if defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__) || defined(__DragonFly__)
#define MP_USE_ALT_RAND 1
#endif
/* use arc4random on platforms that support it */
#ifdef MP_USE_ALT_RAND
#define MP_GEN_RANDOM() arc4random()
#else
#define MP_GEN_RANDOM() rand()
#endif
#define MP_DIGIT_BIT DIGIT_BIT
#define MP_MASK ((((mp_digit)1)<<((mp_digit)DIGIT_BIT))-((mp_digit)1))