unsigned udns_jranval(struct udns_jranctx *x) {
/* This routine can be made to work with either 32 or 64bit words -
* if JRAN_32_64 is defined when compiling the file.
* We use if() instead of #if since there's no good
* portable way to check sizeof() in preprocessor without
* introducing some ugly configure-time checks.
* Most compilers will optimize the wrong branches away anyway.
* By default it assumes 32bit integers
*/
#ifdef JRAN_32_64
if (sizeof(unsigned) == 4) {
#endif
unsigned e = tr32(x->a - rot32(x->b, 27));
x->a = tr32(x->b ^ rot32(x->c, 17));
x->b = tr32(x->c + x->d);
x->c = tr32(x->d + e);
x->d = tr32(e + x->a);
#ifdef JRAN_32_64
}
else if (sizeof(unsigned) == 8) { /* assuming it's 64bits */
unsigned e = x->a - rot64(x->b, 7);
x->a = x->b ^ rot64(x->c, 13);
x->b = x->c + rot64(x->d, 37);
x->c = x->d + e;
x->d = e + x->a;
}
else {
unsigned e = 0;
x->d = 1/e; /* bail */
}
#endif
return x->d;
}
static __always_inline uint64_t final128(uint64_t a, uint64_t b, uint64_t c,
uint64_t d, uint64_t *h) {
mixup64(&a, &b, rot64(c, 41) ^ d, prime_0);
mixup64(&b, &c, rot64(d, 23) ^ a, prime_6);
mixup64(&c, &d, rot64(a, 19) ^ b, prime_5);
mixup64(&d, &a, rot64(b, 31) ^ c, prime_4);
*h = c + d;
return a ^ b;
}
static __inline uint64_t final_weak_avalanche(uint64_t a, uint64_t b) {
/* LY: for performance reason on a some not high-end CPUs
* I replaced the second mux64() operation by mix64().
* Unfortunately this approach fails the "strict avalanche criteria",
* see test results at https://github.com/demerphq/smhasher. */
return mux64(rot64(a + b, 17), prime_4) + mix64(a ^ b, prime_0);
}
/* xor-mul-xor mixer */
static __inline uint64_t mix64(uint64_t v, uint64_t p) {
v *= p;
return v ^ rot64(v, 41);
}
static __always_inline void squash(t1ha_state256_t *s) {
s->n.a ^= prime_6 * (s->n.c + rot64(s->n.d, 23));
s->n.b ^= prime_5 * (rot64(s->n.c, 19) + s->n.d);
}
static __always_inline void init_cd(t1ha_state256_t *s, uint64_t x,
uint64_t y) {
s->n.c = rot64(y, 23) + ~x;
s->n.d = ~y + rot64(x, 19);
}
