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PPP, magic, improved magic_randomize() when using PPP_MD5_RANDM

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Added the random seed already used without PPP_MD5_RANDM
as an entropy source when PPP_MD5_RANDM feature is enabled.

(And a little bit of code cleaning for both)
This commit is contained in:
Sylvain Rochet 2015-08-31 10:19:11 +02:00
parent dd8feb49aa
commit a17b3fc838
1 changed files with 7 additions and 5 deletions
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12
src/netif/ppp/magic.c
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@ -88,7 +88,8 @@
#define MD5_HASH_SIZE 16
static char magic_randpool[MD5_HASH_SIZE]; /* Pool of randomness. */
static long magic_randcount = 0; /* Pseudo-random incrementer */
static long magic_randcount; /* Pseudo-random incrementer */
static u32_t magic_randomseed; /* Seed used for random number generation. */
/*
* Churn the randomness pool on a random event. Call this early and often
@ -116,7 +117,8 @@ static void magic_churnrand(char *rand_data, u32_t rand_len) {
u32_t rand;
#endif /* LWIP_RAND */
} sys_data;
sys_data.jiffies = sys_jiffies();
magic_randomseed += sys_jiffies() & 0xffff;
sys_data.jiffies = magic_randomseed;
#ifdef LWIP_RAND
sys_data.rand = LWIP_RAND();
#endif /* LWIP_RAND */
@ -193,8 +195,8 @@ u32_t magic(void) {
/*****************************/
/*** LOCAL DATA STRUCTURES ***/
/*****************************/
static int magic_randomized = 0; /* Set when truely randomized. */
static u32_t magic_randomseed = 0; /* Seed used for random number generation. */
static int magic_randomized; /* Set when truely randomized. */
static u32_t magic_randomseed; /* Seed used for random number generation. */
/***********************************/
@ -257,7 +259,7 @@ u32_t magic(void) {
#ifdef LWIP_RAND
return LWIP_RAND() + magic_randomseed;
#else /* LWIP_RAND */
return (u32_t)rand() << 16 + (u32_t)rand() + magic_randomseed;
return ((u32_t)rand() << 16) + (u32_t)rand() + magic_randomseed;
#endif /* LWIP_RAND */
}