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demo: read from urandom if someone requests real random data

This commit is contained in:
Steffen Jaeckel 2015-04-18 14:58:15 +02:00
parent ac4550ccbd
commit cb085f06cf
1 changed files with 28 additions and 0 deletions
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28
demo/demo.c
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@ -61,10 +61,23 @@ int lbit(void)
}
}
#if defined(LTM_DEMO_REAL_RAND) && !defined(_WIN32)
static FILE* fd_urandom;
#endif
int myrng(unsigned char *dst, int len, void *dat)
{
int x;
(void)dat;
#if defined(LTM_DEMO_REAL_RAND)
if (!fd_urandom) {
#if !defined(_WIN32)
fprintf(stderr, "\nno /dev/urandom\n");
#endif
}
else {
return fread(dst, 1, len, fd_urandom);
}
#endif
for (x = 0; x < len; x++)
dst[x] = rand() & 0xFF;
return len;
@ -84,6 +97,11 @@ static void _cleanup(void)
{
mp_clear_multi(&a, &b, &c, &d, &e, &f, NULL);
printf("\n");
#ifdef LTM_DEMO_REAL_RAND
if(fd_urandom)
fclose(fd_urandom);
#endif
}
char cmd[4096], buf[4096];
@ -107,6 +125,16 @@ int main(void)
atexit(_cleanup);
#if defined(LTM_DEMO_REAL_RAND)
if (!fd_urandom) {
fd_urandom = fopen("/dev/urandom", "r");
if (!fd_urandom) {
#if !defined(_WIN32)
fprintf(stderr, "\ncould not open /dev/urandom\n");
#endif
}
}
#endif
srand(LTM_DEMO_RAND_SEED);
#ifdef MP_8BIT