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Improve the random logic for the INTIME RTOS RNG.

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This commit is contained in:
David Garske
2021-03-02 15:04:01 -08:00
parent 8c1a93d9e1
commit 3752347f14
1 changed files with 13 additions and 2 deletions
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15
wolfcrypt/src/random.c
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@ -2237,16 +2237,27 @@ int wc_GenerateSeed(OS_Seed* os, byte* output, word32 sz)
int wc_GenerateSeed(OS_Seed* os, byte* output, word32 sz)
{
uint32_t randval;
word32 len = sizeof(randval);
word32 len;
if (output == NULL) {
return BUFFER_E;
}
#ifdef INTIMEVER
/* If INTIMEVER exists then it is INTIME RTOS v6 or later */
#define INTIME_RAND_FUNC arc4random
len = 4;
#else
/* v5 and older */
#define INTIME_RAND_FUNC rand
srand(time(0));
len = 2; /* don't use all 31 returned bits */
#endif
while (sz > 0) {
if (sz < len)
len = sz;
randval = rand(); /* returns 32-bits of random */
randval = INTIME_RAND_FUNC();
XMEMCPY(output, &randval, len);
output += len;
sz -= len;