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utils.go
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/
utils.go
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package esch
import (
"math/bits"
"encoding/binary"
)
// Endianness option
const littleEndian bool = true
func GETU32(ptr []byte) uint32 {
if littleEndian {
return binary.LittleEndian.Uint32(ptr)
} else {
return binary.BigEndian.Uint32(ptr)
}
}
func PUTU32(ptr []byte, a uint32) {
if littleEndian {
binary.LittleEndian.PutUint32(ptr, a)
} else {
binary.BigEndian.PutUint32(ptr, a)
}
}
func bytesToUint32s(b []byte) []uint32 {
size := len(b) / 4
dst := make([]uint32, size)
for i := 0; i < size; i++ {
j := i * 4
if littleEndian {
dst[i] = binary.LittleEndian.Uint32(b[j:])
} else {
dst[i] = binary.BigEndian.Uint32(b[j:])
}
}
return dst
}
func uint32sToBytes(w []uint32) []byte {
size := len(w) * 4
dst := make([]byte, size)
for i := 0; i < len(w); i++ {
j := i * 4
if littleEndian {
binary.LittleEndian.PutUint32(dst[j:], w[i])
} else {
binary.BigEndian.PutUint32(dst[j:], w[i])
}
}
return dst
}
func tmin(a, b int) int {
if a < b {
return a
}
return b
}
func rotatel32(x uint32, n int) uint32 {
return bits.RotateLeft32(x, n)
}
func rotater32(x uint32, n int) uint32 {
return rotatel32(x, 32 - n)
}
func sparkle(H *[16]uint32, rounds int, ns int) {
var s, i, j, px, py int
var x, y uint32
for s = 0; s < ns; s++ {
H[1] ^= C[s % 8]
H[3] ^= uint32(s)
px = 0
py = 1
for j = 0; j < rounds; j++ {
H[px] += rotater32(H[py], 31)
H[py] ^= rotater32(H[px], 24)
H[px] ^= C[j]
H[px] += rotater32(H[py], 17)
H[py] ^= rotater32(H[px], 17)
H[px] ^= C[j]
H[px] += H[py]
H[py] ^= rotater32(H[px], 31)
H[px] ^= C[j]
H[px] += rotater32(H[py], 24)
H[py] ^= rotater32(H[px], 16)
H[px] ^= C[j]
px += 2
py += 2
}
x = H[0] ^ H[2] ^ H[4]
y = H[1] ^ H[3] ^ H[5]
if rounds > 6 {
x ^= H[6]
y ^= H[7]
}
x = rotater32(x ^ (x << 16), 16)
y = rotater32(y ^ (y << 16), 16)
j = rounds
for i = 0; i < rounds; i += 2 {
H[j] ^= H[i] ^ y
H[j + 1] ^= H[i + 1] ^ x
j += 2
}
x = H[rounds]
y = H[rounds + 1]
for i = 0; i < rounds - 2; i++ {
H[i + rounds] = H[i]
H[i] = H[i + rounds + 2]
}
H[rounds * 2 - 2] = H[rounds - 2]
H[rounds * 2 - 1] = H[rounds - 1]
H[rounds - 2] = x
H[rounds - 1] = y
}
}