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PPP, magic, use LWIP_RAND() if available

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If LWIP_RAND() is available, it is used instead of libc srand()/rand()
if PPP_MD5_RANDM is disabled and it is added as a source of randomness
if PPP_MD5_RANDM is enabled.
This commit is contained in:
Sylvain Rochet 2015-08-30 21:04:14 +02:00
parent 541e3b6eb4
commit 36305e5bd8
1 changed files with 13 additions and 2 deletions
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15
src/netif/ppp/magic.c
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@ -112,8 +112,14 @@ static void magic_churnrand(char *rand_data, u32_t rand_len) {
struct {
/* INCLUDE fields for any system sources of randomness */
u32_t jiffies;
#ifdef LWIP_RAND
u32_t rand;
#endif /* LWIP_RAND */
} sys_data;
sys_data.jiffies = sys_jiffies();
#ifdef LWIP_RAND
sys_data.rand = LWIP_RAND();
#endif /* LWIP_RAND */
/* Load sys_data fields here. */
md5_update(&md5, (u_char *)&sys_data, sizeof(sys_data));
}
@ -211,9 +217,10 @@ static u32_t magic_randomseed = 0; /* Seed used for random number generatio
*/
void magic_init(void) {
magic_randomseed += sys_jiffies();
#ifndef LWIP_RAND
/* Initialize the Borland random number generator. */
srand((unsigned)magic_randomseed);
#endif /* LWIP_RAND */
}
/*
@ -247,7 +254,11 @@ void magic_randomize(void) {
* seeded by the real time clock.
*/
u32_t magic(void) {
return ((((u32_t)rand() << 16) + rand()) + magic_randomseed);
#ifdef LWIP_RAND
return LWIP_RAND() + magic_randomseed;
#else /* LWIP_RAND */
return (u32_t)rand() << 16 + (u32_t)rand() + magic_randomseed;
#endif /* LWIP_RAND */
}
/*