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rapidhash.go
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308 lines (282 loc) · 8.03 KB
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package rapidhash
import (
"encoding/binary"
"math/bits"
)
// Default seed
// const rapid_seed uint64 = 0xBDD89AA982704029
// Default secret parameters
var rapid_secret [8]uint64 = [8]uint64{
0x2d358dccaa6c78a5,
0x8bb84b93962eacc9,
0x4b33a62ed433d4a3,
0x4d5a2da51de1aa47,
0xa0761d6478bd642f,
0xe7037ed1a0b428db,
0x90ed1765281c388c,
0xaaaaaaaaaaaaaaaa,
}
/*
64*64 -> 128bit multiply function.
Calculates 128-bit C = *A * *B.
*/
func rapid_mum(A *uint64, B *uint64) {
hi, lo := bits.Mul64(*A, *B)
*A = lo
*B = hi
}
func rapid_mum_protected(A *uint64, B *uint64) {
hi, lo := bits.Mul64(*A, *B)
*A ^= lo
*B ^= hi
}
/*
* Multiply and xor mix function.
*
* Calculates 128-bit C = A * B.
* Returns 64-bit xor between high and low 64 bits of C.
*/
func rapid_mix(A, B uint64) uint64 {
rapid_mum(&A, &B)
return A ^ B
}
func readSmall(data []byte, bufferlen uint64) uint64 {
return (uint64(data[0]) << 56) | (uint64(data[bufferlen>>1]) << 32) | uint64(data[bufferlen-1])
}
func read64(data []byte) uint64 {
return binary.LittleEndian.Uint64(data)
}
func read32(data []byte) uint64 {
return uint64(binary.LittleEndian.Uint32(data))
}
func rapidhash_internal(data []byte, seed uint64, secret [8]uint64) uint64 {
bufferlen := uint64(len(data))
seed ^= rapid_mix(seed^secret[2], secret[1])
var a, b uint64
p := data
i := bufferlen
if bufferlen <= 16 {
if bufferlen >= 4 {
seed ^= bufferlen
if bufferlen >= 8 {
var datalast = data[bufferlen-8:]
a = read64(data)
b = read64(datalast)
} else {
var datalast = data[bufferlen-4:]
a = read32(data)
b = read32(datalast)
}
} else {
if bufferlen > 0 {
a = (((uint64)(data[0])) << 45) | ((uint64)(data[bufferlen-1]))
b = (uint64)(data[bufferlen>>1])
} /* else { // Initialized to 0 by default
a = 0
b = 0
} */
}
} else {
var see1, see2 = seed, seed
var see3, see4 = seed, seed
var see5, see6 = seed, seed
// unrolled loop
if i > 224 {
for i >= 224 {
seed = rapid_mix(read64(p)^secret[0], read64(p[8:])^seed)
see1 = rapid_mix(read64(p[16:])^secret[1], read64(data[24:])^see1)
see2 = rapid_mix(read64(p[32:])^secret[2], read64(data[40:])^see2)
see3 = rapid_mix(read64(p[48:])^secret[3], read64(data[56:])^see3)
see4 = rapid_mix(read64(p[64:])^secret[4], read64(data[72:])^see4)
see5 = rapid_mix(read64(p[80:])^secret[5], read64(data[88:])^see5)
see6 = rapid_mix(read64(p[96:])^secret[6], read64(data[104:])^see6)
seed = rapid_mix(read64(p[112:])^secret[0], read64(p[120:])^seed)
see1 = rapid_mix(read64(p[128:])^secret[1], read64(data[136:])^see1)
see2 = rapid_mix(read64(p[144:])^secret[2], read64(data[152:])^see2)
see3 = rapid_mix(read64(p[160:])^secret[3], read64(data[168:])^see3)
see4 = rapid_mix(read64(p[176:])^secret[4], read64(data[184:])^see4)
see5 = rapid_mix(read64(p[192:])^secret[5], read64(data[200:])^see5)
see6 = rapid_mix(read64(p[208:])^secret[6], read64(data[216:])^see6)
p = p[224:]
i -= 224
}
}
if i > 112 {
seed = rapid_mix(read64(p)^secret[0], read64(p[8:])^seed)
see1 = rapid_mix(read64(p[16:])^secret[1], read64(data[24:])^see1)
see2 = rapid_mix(read64(p[32:])^secret[2], read64(data[40:])^see2)
see3 = rapid_mix(read64(p[48:])^secret[3], read64(data[56:])^see3)
see4 = rapid_mix(read64(p[64:])^secret[4], read64(data[72:])^see4)
see5 = rapid_mix(read64(p[80:])^secret[5], read64(data[88:])^see5)
see6 = rapid_mix(read64(p[96:])^secret[6], read64(data[104:])^see6)
p = p[112:]
i -= 112
}
seed ^= see1
see2 ^= see3
see4 ^= see5
seed ^= see6
see2 ^= see4
seed ^= see2
if i > 16 {
seed = rapid_mix(read64(p)^secret[2], read64(p[8:])^seed)
if i > 32 {
seed = rapid_mix(read64(p[16:])^secret[2], read64(p[24:])^seed)
if i > 48 {
seed = rapid_mix(read64(p[32:])^secret[1], read64(p[40:])^seed)
if i > 64 {
seed = rapid_mix(read64(p[48:])^secret[1], read64(p[56:])^seed)
if i > 80 {
seed = rapid_mix(read64(p[64:])^secret[2], read64(p[72:])^seed)
if i > 96 {
seed = rapid_mix(read64(p[80:])^secret[1], read64(p[88:])^seed)
}
}
}
}
}
}
a = read64(data[bufferlen-((uint64)(len(p)))+i-16:]) ^ i
b = read64(data[bufferlen-((uint64)(len(p)))+i-8:])
}
a ^= secret[1]
b ^= seed
rapid_mum(&a, &b)
return rapid_mix(a^secret[7], b^secret[1]^i)
}
func RapidhashWithSeed(data []byte, seed uint64) uint64 {
return rapidhash_internal(data, seed, rapid_secret)
}
func Rapidhash(data []byte) uint64 {
return RapidhashWithSeed(data, 0)
}
func rapidhash_micro_internal(data []byte, seed uint64, secret [8]uint64) uint64 {
bufferlen := uint64(len(data))
p := data
i := bufferlen
var a, b uint64
seed ^= rapid_mix(seed^secret[2], secret[1])
if bufferlen <= 16 {
if bufferlen >= 4 {
seed ^= bufferlen
if bufferlen >= 8 {
var datalast = data[bufferlen-8:]
a = read64(data)
b = read64(datalast)
} else {
var datalast = data[bufferlen-4:]
a = read32(data)
b = read32(datalast)
}
} else {
if bufferlen > 0 {
a = (((uint64)(data[0])) << 45) | ((uint64)(data[bufferlen-1]))
b = (uint64)(data[bufferlen>>1])
} /* else { // Initialized to 0 by default
a = 0
b = 0
} */
}
} else {
if i > 80 {
var see1, see2, see3, see4 = seed, seed, seed, seed
for i >= 80 {
seed = rapid_mix(read64(p)^secret[0], read64(p[8:])^seed)
see1 = rapid_mix(read64(p[16:])^secret[1], read64(p[24:])^see1)
see2 = rapid_mix(read64(p[32:])^secret[2], read64(p[40:])^see2)
see3 = rapid_mix(read64(p[48:])^secret[3], read64(p[56:])^see3)
see4 = rapid_mix(read64(p[64:])^secret[4], read64(p[72:])^see4)
p = p[80:]
i -= 80
}
seed ^= see1
see2 ^= see3
seed ^= see4
seed ^= see2
}
if i > 16 {
seed = rapid_mix(read64(p)^secret[2], read64(p[8:])^seed)
if i > 32 {
seed = rapid_mix(read64(p[16:])^secret[2], read64(p[24:])^seed)
if i > 48 {
seed = rapid_mix(read64(p[32:])^secret[1], read64(p[40:])^seed)
if i > 64 {
seed = rapid_mix(read64(p[48:])^secret[1], read64(p[56:])^seed)
}
}
}
}
a = read64(data[bufferlen-((uint64)(len(p)))+i-16:]) ^ i
b = read64(data[bufferlen-((uint64)(len(p)))+i-8:])
}
a ^= secret[1]
b ^= seed
rapid_mum(&a, &b)
return rapid_mix(a^secret[7], b^secret[1]^i)
}
func rapidhash_nano_internal(data []byte, seed uint64, secret [8]uint64) uint64 {
bufferlen := uint64(len(data))
p := data
i := bufferlen
var a, b uint64
seed ^= rapid_mix(seed^secret[2], secret[1])
if bufferlen <= 16 {
if bufferlen >= 4 {
seed ^= bufferlen
if bufferlen >= 8 {
var datalast = data[bufferlen-8:]
a = read64(data)
b = read64(datalast)
} else {
var datalast = data[bufferlen-4:]
a = read32(data)
b = read32(datalast)
}
} else {
if bufferlen > 0 {
a = (((uint64)(data[0])) << 45) | ((uint64)(data[bufferlen-1]))
b = (uint64)(data[bufferlen>>1])
} /* else { // Initialized to 0 by default
a = 0
b = 0
} */
}
} else {
if i > 48 {
var see1, see2 = seed, seed
for i >= 48 {
seed = rapid_mix(read64(p)^secret[0], read64(p[8:])^seed)
see1 = rapid_mix(read64(p[16:])^secret[1], read64(p[24:])^see1)
see2 = rapid_mix(read64(p[32:])^secret[2], read64(p[40:])^see2)
p = p[48:]
i -= 48
}
seed ^= see1
seed ^= see2
}
if i > 16 {
seed = rapid_mix(read64(p)^secret[2], read64(p[8:])^seed)
if i > 32 {
seed = rapid_mix(read64(p[16:])^secret[2], read64(p[24:])^seed)
}
}
a = read64(data[bufferlen-((uint64)(len(p)))+i-16:]) ^ i
b = read64(data[bufferlen-((uint64)(len(p)))+i-8:])
}
a ^= secret[1]
b ^= seed
rapid_mum(&a, &b)
return rapid_mix(a^secret[7], b^secret[1]^i)
}
func RapidhashMicroWithSeed(data []byte, seed uint64) uint64 {
return rapidhash_micro_internal(data, seed, rapid_secret)
}
func RapidhashMicro(data []byte) uint64 {
return RapidhashMicroWithSeed(data, 0)
}
func RapidhashNanoWithSeed(data []byte, seed uint64) uint64 {
return rapidhash_nano_internal(data, seed, rapid_secret)
}
func RapidhashNano(data []byte) uint64 {
return RapidhashNanoWithSeed(data, 0)
}