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utils.go
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utils.go
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package magenta
import (
"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 Byte(x uint32, n int) uint32 {
return uint32(byte(x >> (8 * n)))
}
const GF_POLY = 0x0165
var f_tab [256]uint32
func init_tab() {
var i, f uint32
f = 1
for i = 0; i < 255; i++ {
f_tab[i] = uint32(byte(f))
f <<= 1
if (f & 0x100) > 0 {
f ^= GF_POLY
}
}
f_tab[255] = 0
}
func pi_fun(y *[4]uint32, x [4]uint32) {
y[0] = f_tab[Byte(x[0], 0) ^ f_tab[Byte(x[2], 0)]] |
(f_tab[Byte(x[2], 0) ^ f_tab[Byte(x[0], 0)]] << 8) |
(f_tab[Byte(x[0], 1) ^ f_tab[Byte(x[2], 1)]] << 16) |
(f_tab[Byte(x[2], 1) ^ f_tab[Byte(x[0], 1)]] << 24)
y[1] = f_tab[Byte(x[0], 2) ^ f_tab[Byte(x[2], 2)]] |
(f_tab[Byte(x[2], 2) ^ f_tab[Byte(x[0], 2)]] << 8) |
(f_tab[Byte(x[0], 3) ^ f_tab[Byte(x[2], 3)]] << 16) |
(f_tab[Byte(x[2], 3) ^ f_tab[Byte(x[0], 3)]] << 24)
y[2] = f_tab[Byte(x[1], 0) ^ f_tab[Byte(x[3], 0)]] |
(f_tab[Byte(x[3], 0) ^ f_tab[Byte(x[1], 0)]] << 8) |
(f_tab[Byte(x[1], 1) ^ f_tab[Byte(x[3], 1)]] << 16) |
(f_tab[Byte(x[3], 1) ^ f_tab[Byte(x[1], 1)]] << 24)
y[3] = f_tab[Byte(x[1], 2) ^ f_tab[Byte(x[3], 2)]] |
(f_tab[Byte(x[3], 2) ^ f_tab[Byte(x[1], 2)]] << 8) |
(f_tab[Byte(x[1], 3) ^ f_tab[Byte(x[3], 3)]] << 16) |
(f_tab[Byte(x[3], 3) ^ f_tab[Byte(x[1], 3)]] << 24)
}
func e3_fun(x *[4]uint32) {
var u, v [4]uint32
u[0] = x[0]
u[1] = x[1]
u[2] = x[2]
u[3] = x[3]
pi_fun(&v, u)
pi_fun(&u, v)
pi_fun(&v, u)
pi_fun(&u, v)
v[0] = Byte(u[0], 0) | (Byte(u[0], 2) << 8) | (Byte(u[1], 0) << 16) | (Byte(u[1], 2) << 24)
v[1] = Byte(u[2], 0) | (Byte(u[2], 2) << 8) | (Byte(u[3], 0) << 16) | (Byte(u[3], 2) << 24)
v[2] = Byte(u[0], 1) | (Byte(u[0], 3) << 8) | (Byte(u[1], 1) << 16) | (Byte(u[1], 3) << 24)
v[3] = Byte(u[2], 1) | (Byte(u[2], 3) << 8) | (Byte(u[3], 1) << 16) | (Byte(u[3], 3) << 24)
u[0] = x[0] ^ v[0]
u[1] = x[1] ^ v[1]
u[2] = x[2] ^ v[2]
u[3] = x[3] ^ v[3]
pi_fun(&v, u)
pi_fun(&u, v)
pi_fun(&v, u)
pi_fun(&u, v)
v[0] = Byte(u[0], 0) | (Byte(u[0], 2) << 8) | (Byte(u[1], 0) << 16) | (Byte(u[1], 2) << 24)
v[1] = Byte(u[2], 0) | (Byte(u[2], 2) << 8) | (Byte(u[3], 0) << 16) | (Byte(u[3], 2) << 24)
v[2] = Byte(u[0], 1) | (Byte(u[0], 3) << 8) | (Byte(u[1], 1) << 16) | (Byte(u[1], 3) << 24)
v[3] = Byte(u[2], 1) | (Byte(u[2], 3) << 8) | (Byte(u[3], 1) << 16) | (Byte(u[3], 3) << 24)
u[0] = x[0] ^ v[0]
u[1] = x[1] ^ v[1]
u[2] = x[2] ^ v[2]
u[3] = x[3] ^ v[3]
pi_fun(&v, u)
pi_fun(&u, v)
pi_fun(&v, u)
pi_fun(&u, v)
v[0] = Byte(u[0], 0) | (Byte(u[0], 2) << 8) | (Byte(u[1], 0) << 16) | (Byte(u[1], 2) << 24)
v[1] = Byte(u[2], 0) | (Byte(u[2], 2) << 8) | (Byte(u[3], 0) << 16) | (Byte(u[3], 2) << 24)
v[2] = Byte(u[0], 1) | (Byte(u[0], 3) << 8) | (Byte(u[1], 1) << 16) | (Byte(u[1], 3) << 24)
v[3] = Byte(u[2], 1) | (Byte(u[2], 3) << 8) | (Byte(u[3], 1) << 16) | (Byte(u[3], 3) << 24)
x[0] = v[0]
x[1] = v[1]
}
func r_fun(tt *[4]uint32, x, y, k []uint32) {
tt[0] = y[0]
tt[1] = y[1]
tt[2] = k[0]
tt[3] = k[1]
e3_fun(tt)
x[0] ^= tt[0]
x[1] ^= tt[1]
}