static int trivial_quick(rand_pool *r) { return (-1); }
+#if __GNUC__ && (CPUFAM_X86 || CPUFAM_AMD64)
+static int rdrand_quick(rand_pool *r)
+{
+ unsigned long rr;
+ int i = 16;
+
+ __asm__ ("0: rdrand %0; jc 9f; dec %1; jnz 0b; 9:"
+ : "=r" (rr), "=r" (i) : "1" (i) : "cc");
+ if (!i) return (-1);
+ rand_add(r, &rr, sizeof(rr), 8*sizeof(rr));
+ return (0);
+}
+#endif
+
static quick__functype *pick_quick(void)
{
+#if __GNUC__ && (CPUFAM_X86 || CPUFAM_AMD64)
+ DISPATCH_PICK_COND(rand_quick, rdrand_quick,
+ cpu_feature_p(CPUFEAT_X86_RDRAND));
+#endif
DISPATCH_PICK_FALLBACK(rand_quick, trivial_quick);
}
HASH_INIT(&hc);
STORE32(g, r->gen); HASH(&hc, g, sizeof(g));
+ HASH(&hc, r->k.k, RAND_KEYSZ);
HASH(&hc, r->pool, RAND_POOLSZ);
HASH(&hc, r->buf, RAND_BUFSZ);
HASH_DONE(&hc, h);
r->o = RAND_SECSZ;
r->obits += r->ibits;
if (r->obits > RAND_OBITS) {
- r->ibits = r->obits - r->ibits;
+ r->ibits = r->obits - RAND_OBITS;
r->obits = RAND_OBITS;
} else
r->ibits = 0;
HASH_INIT(&hc);
STORE32(g, r->gen); HASH(&hc, g, sizeof(g));
+ HASH(&hc, r->k.k, RAND_KEYSZ);
HASH(&hc, r->pool, RAND_POOLSZ);
HASH(&hc, r->buf, RAND_BUFSZ);
HASH_DONE(&hc, h);
chunk = r->obits / 8;
}
- if (chunk + r->o > RAND_BUFSZ)
+ if (chunk + r->o <= RAND_BUFSZ) {
+ memcpy(o, r->buf + r->o, chunk);
+ r->o += chunk;
+ } else {
chunk = RAND_BUFSZ - r->o;
+ memcpy(o, r->buf + r->o, chunk);
+ rand_stretch(r);
+ }
- memcpy(o, r->buf + r->o, chunk);
- r->o += chunk;
r->obits -= chunk * 8;
o += chunk;
sz -= chunk;