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utils.go
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/
utils.go
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package siphash
import (
"math/bits"
)
const BLOCK_SIZE = 8
const KEY_SIZE = 16
const MIN_DIGEST_SIZE = 8
const MAX_DIGEST_SIZE = 16
const C_ROUNDS = 2
const D_ROUNDS = 4
func ROTL(x, n uint64) uint64 {
return bits.RotateLeft64(x, int(n))
}
func U32TO8_LE(p []byte, v uint32) {
p[0] = byte(v)
p[1] = byte(v >> 8)
p[2] = byte(v >> 16)
p[3] = byte(v >> 24)
}
func U64TO8_LE(p []byte, v uint64) {
U32TO8_LE(p, uint32(v))
U32TO8_LE(p[4:], uint32(v >> 32))
}
func U8TO64_LE(p []byte) uint64 {
v := (uint64(p[0]) ) |
(uint64(p[1]) << 8) |
(uint64(p[2]) << 16) |
(uint64(p[3]) << 24) |
(uint64(p[4]) << 32) |
(uint64(p[5]) << 40) |
(uint64(p[6]) << 48) |
(uint64(p[7]) << 56)
return v
}
func SIPROUND(v0, v1, v2, v3 *uint64) {
(*v0) += (*v1)
(*v1) = ROTL((*v1), 13)
(*v1) ^= (*v0)
(*v0) = ROTL((*v0), 32)
(*v2) += (*v3)
(*v3) = ROTL((*v3), 16)
(*v3) ^= (*v2)
(*v0) += (*v3)
(*v3) = ROTL((*v3), 21)
(*v3) ^= (*v0)
(*v2) += (*v1)
(*v1) = ROTL((*v1), 17)
(*v1) ^= (*v2)
(*v2) = ROTL((*v2), 32)
}