-
Notifications
You must be signed in to change notification settings - Fork 2
/
fnv.cuh
61 lines (48 loc) · 1.52 KB
/
fnv.cuh
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
/*
(C)TAO.Foundation for TETHASHV1 modification. GPL V3 License term.
https://en.wikipedia.org/wiki/Fowler%E2%80%93Noll%E2%80%93Vo_hash_function#FNV-1_hash
FNV_hash0 is depricated
use FNV1 hash
use hash offset
FNV-1a hash
The FNV-1a hash differs from the FNV-1 hash by only the order in which the multiply and XOR is performed:[8][10]
hash = FNV_offset_basis
for each byte_of_data to be hashed
hash = hash XOR byte_of_data
hash = hash × FNV_prime
return hash
Size in bits
{\displaystyle n=2^{s}} {\displaystyle n=2^{s}}
FNV prime FNV offset basis
32 224 + 28 + 0x93 = 16777619
2166136261 = 0x811c9dc5
*/
#define __TETHASHV1__
#undef __ETHASH__
#define FNV_PRIME 0x01000193
#define FNV_OFFSET_BASIS 0x811c9dc5
#ifdef __ETHASH__
#define fnv(x, y) ((x) * FNV_PRIME ^ (y))
#else // default __TETHASHV1__
#define fnv(x, y) ( ( ((FNV_OFFSET_BASIS) ^ (x)) * (FNV_PRIME) ^ (y) ) * FNV_PRIME)
#endif
__device__ uint4 fnv4(uint4 a, uint4 b)
{
uint4 c;
#ifdef ETHASH
c.x = a.x * FNV_PRIME ^ b.x;
c.y = a.y * FNV_PRIME ^ b.y;
c.z = a.z * FNV_PRIME ^ b.z;
c.w = a.w * FNV_PRIME ^ b.w;
#else // TETHASHV1
c.x = ( ((((FNV_OFFSET_BASIS)^(a.x))*FNV_PRIME) ^ (b.x)) * FNV_PRIME );
c.y = ( ((((FNV_OFFSET_BASIS)^(a.y))*FNV_PRIME) ^ (b.y)) * FNV_PRIME );
c.z = ( ((((FNV_OFFSET_BASIS)^(a.z))*FNV_PRIME) ^ (b.z)) * FNV_PRIME );
c.w = ( ((((FNV_OFFSET_BASIS)^(a.w))*FNV_PRIME) ^ (b.w)) * FNV_PRIME );
#endif
return c;
}
__device__ uint32_t fnv_reduce(uint4 v)
{
return fnv(fnv(fnv(v.x, v.y), v.z), v.w);
}