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Use PcgRandom from @kwolekr for OSes not providing /dev/urandom 

Also, begin with style fix changes.
master
est31 2015-05-01 09:57:11 +02:00
parent e5a12b1d06
commit 16d6125ed5
1 changed files with 47 additions and 17 deletions
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64
srp.c
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@ -462,37 +462,67 @@ static void calculate_H_AMK( SRP_HashAlgorithm alg, unsigned char *dest, const m
hash_final( alg, &ctx, dest );
}
struct srp_pcgrandom {
unsigned long long int m_state;
unsigned long long int m_inc;
}; typedef struct srp_pcgrandom srp_pcgrandom;
static unsigned long int srp_pcgrandom_next(srp_pcgrandom *r)
{
unsigned long long int oldstate = r->m_state;
r->m_state = oldstate * 6364136223846793005ULL + r->m_inc;
unsigned long int xorshifted = ((oldstate >> 18u) ^ oldstate) >> 27u;
unsigned long int rot = oldstate >> 59u;
return (xorshifted >> rot) | (xorshifted << ((-rot) & 31));
}
static srp_pcgrandom_seed(srp_pcgrandom *r, unsigned long long int state,
unsigned long long int seq)
{
r->m_state = 0U;
r->m_inc = (seq << 1u) | 1u;
srp_pcgrandom_next(r);
r->m_state += state;
srp_pcgrandom_next(r);
}
static int fill_buff()
{
g_rand_idx = 0;
g_rand_idx = 0;
#ifdef WIN32
HCRYPTPROV wctx;
HCRYPTPROV wctx;
#else
FILE *fp = 0;
FILE *fp = 0;
#endif
#ifdef WIN32
CryptAcquireContext(&wctx, NULL, NULL, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT);
CryptAcquireContext(&wctx, NULL, NULL, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT);
CryptGenRandom(wctx, sizeof(g_rand_buff), (BYTE*) g_rand_buff);
CryptReleaseContext(wctx, 0);
CryptGenRandom(wctx, sizeof(g_rand_buff), (BYTE*) g_rand_buff);
CryptReleaseContext(wctx, 0);
return 1;
return 1;
#else
fp = fopen("/dev/urandom", "r");
fp = fopen("/dev/urandom", "r");
if (fp)
{
fread(g_rand_buff, sizeof(g_rand_buff), 1, fp);
fclose(fp);
return 1;
}
if (fp) {
fread(g_rand_buff, sizeof(g_rand_buff), 1, fp);
fclose(fp);
} else {
srp_pcgrandom *r = malloc(sizeof(srp_pcgrandom));
srp_pcgrandom_seed(r, time(NULL) ^ clock(), 0xda3e39cb94b95bdbULL);
size_t i = 0;
for (i = 0; i < RAND_BUFF_MAX; i++) {
g_rand_buff[i] = srp_pcgrandom_next(r);
}
}
#endif
return 0;
return 1;
}
static void mpz_fill_random( mpz_t num )