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utils.go
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utils.go
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package noekeon
import (
"math/bits"
"encoding/binary"
)
// Endianness option
const littleEndian bool = false
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 bytesToUint32(inp []byte) (blk uint32) {
if littleEndian {
blk = binary.LittleEndian.Uint32(inp[0:])
} else {
blk = binary.BigEndian.Uint32(inp[0:])
}
return
}
func uint32ToBytes(blk uint32) [4]byte {
var sav [4]byte
if littleEndian {
binary.LittleEndian.PutUint32(sav[0:], blk)
} else {
binary.BigEndian.PutUint32(sav[0:], blk)
}
return sav
}
func ROLc(x uint32, n uint32) uint32 {
return bits.RotateLeft32(x, int(n))
}
func RORc(x uint32, n uint32) uint32 {
return ROLc(x, 32 - n);
}
var RC = []uint32{
0x00000080, 0x0000001b, 0x00000036, 0x0000006c,
0x000000d8, 0x000000ab, 0x0000004d, 0x0000009a,
0x0000002f, 0x0000005e, 0x000000bc, 0x00000063,
0x000000c6, 0x00000097, 0x00000035, 0x0000006a,
0x000000d4,
}
func kTHETA(a, b, c, d *uint32) {
var temp uint32
temp = (*a) ^ (*c)
temp = temp ^ ROLc(temp, 8) ^ RORc(temp, 8)
(*b) ^= temp
(*d) ^= temp
temp = (*b) ^ (*d)
temp = temp ^ ROLc(temp, 8) ^ RORc(temp, 8)
(*a) ^= temp
(*c) ^= temp
}
func THETA(k []uint32, a, b, c, d *uint32) {
var temp uint32
temp = (*a) ^ (*c)
temp = temp ^ ROLc(temp, 8) ^ RORc(temp, 8)
(*b) ^= temp ^ k[1]
(*d) ^= temp ^ k[3]
temp = (*b) ^ (*d)
temp = temp ^ ROLc(temp, 8) ^ RORc(temp, 8)
(*a) ^= temp ^ k[0]
(*c) ^= temp ^ k[2]
}
func GAMMA(a, b, c, d *uint32) {
(*b) ^= ^((*d) | (*c))
(*a) ^= (*c) & (*b)
(*d), (*a) = (*a), (*d)
(*c) ^= (*a) ^ (*b) ^ (*d)
(*b) ^= ^((*d) | (*c))
(*a) ^= (*c) & (*b)
}
func PI1(a, b, c, d *uint32) {
(*b) = ROLc((*b), 1)
(*c) = ROLc((*c), 5)
(*d) = ROLc((*d), 2)
}
func PI2(a, b, c, d *uint32) {
(*b) = RORc((*b), 1)
(*c) = RORc((*c), 5)
(*d) = RORc((*d), 2)
}