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utils.go
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utils.go
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package crypton1
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
}
// u4byte = uint32
// u1byte = byte
func rotr(x, n uint32) uint32 {
return (x >> n) | (x << (32 - n))
}
func rotl(x, n uint32) uint32 {
return (x << n) | (x >> (32 - n))
}
func Byte(x uint32, n uint32) uint32 {
return uint32(byte(x >> (8 * n)))
}
func msk(n uint32) uint32 {
return (0x000000ff >> n) * 0x01010101
}
func brotl(x, n uint32) uint32 {
return (x & msk(n)) << n | (x & ^msk(n)) >> (8 - n)
}
func gamma_tau(b0 []uint32, b1 []uint32, i uint32) {
b0[i] = uint32(s_box[(i + 2) & 3][Byte(b1[0], i)]) |
uint32(s_box[(i + 3) & 3][Byte(b1[1], i)]) << 8 |
uint32(s_box[ i ][Byte(b1[2], i)]) << 16 |
uint32(s_box[(i + 1) & 3][Byte(b1[3], i)]) << 24
}
const (
mb_0 = 0xcffccffc
mb_1 = 0xf33ff33f
mb_2 = 0xfccffccf
mb_3 = 0x3ff33ff3
)
func row_perm(x uint32) uint32 {
return ( x & mb_0) ^
(rotl(x, 8) & mb_1) ^
(rotl(x, 16) & mb_2) ^
(rotl(x, 24) & mb_3)
}
// rotl(row_perm(x), 8) row_perm(rotr(x,8))
func fr0(y []uint32, x []uint32, i, k uint32) {
y[i] = s_tab[ i ][Byte(x[0], i)] ^
s_tab[(i + 1) & 3][Byte(x[1], i)] ^
s_tab[(i + 2) & 3][Byte(x[2], i)] ^
s_tab[(i + 3) & 3][Byte(x[3], i)] ^ k
}
func fr1(y []uint32, x []uint32, i, k uint32) {
y[i] = s_tab[(i + 2) & 3][Byte(x[0], i)] ^
s_tab[(i + 3) & 3][Byte(x[1], i)] ^
s_tab[ i ][Byte(x[2], i)] ^
s_tab[(i + 1) & 3][Byte(x[3], i)] ^ k
}
func f0_rnd(b1 []uint32, b0 []uint32, kp []uint32) {
fr0(b1, b0, 0, kp[0])
fr0(b1, b0, 1, kp[1])
fr0(b1, b0, 2, kp[2])
fr0(b1, b0, 3, kp[3])
}
func f1_rnd(b0 []uint32, b1 []uint32, kp []uint32) {
fr1(b0, b1, 0, kp[0])
fr1(b0, b1, 1, kp[1])
fr1(b0, b1, 2, kp[2])
fr1(b0, b1, 3, kp[3])
}
const (
mc0 = 0xacacacac
mc1 = 0x59595959
mc2 = 0xb2b2b2b2
mc3 = 0x65656565
)
func gen_tab() {
var i, xl, xr, y, yl, yr uint32
for i = 0; i < 256; i++ {
xl = uint32(p1[i >> 4])
xr = uint32(p0[i & 15])
yl = (xl & 0x0e) ^
((xl << 3) & 0x08) ^ ((xl >> 3) & 0x01) ^
((xr << 1) & 0x0a) ^ ((xr << 2) & 0x04) ^
((xr >> 2) & 0x02) ^ ((xr >> 1) & 0x01)
yr = (xr & 0x0d) ^
((xr << 1) & 0x04) ^ ((xr >> 1) & 0x02) ^
((xl >> 1) & 0x05) ^ ((xl << 2) & 0x08) ^
((xl << 1) & 0x02) ^ ((xl >> 2) & 0x01)
y = uint32(ip0[yl] | (ip1[yr] << 4))
yr = ((y << 3) | (y >> 5)) & 255
xr = ((i << 3) | (i >> 5)) & 255
yl = ((y << 1) | (y >> 7)) & 255
xl = ((i << 1) | (i >> 7)) & 255
s_box[0][i] = uint32(byte(yl))
s_box[1][i] = uint32(byte(yr))
s_box[2][xl] = uint32(byte(y))
s_box[3][xr] = uint32(byte(y))
s_tab[0][ i] = (yl * 0x01010101) & 0x3fcff3fc
s_tab[1][ i] = (yr * 0x01010101) & 0xfc3fcff3
s_tab[2][xl] = (y * 0x01010101) & 0xf3fc3fcf
s_tab[3][xr] = (y * 0x01010101) & 0xcff3fc3f
}
xl = 0xa54ff53a
for i = 0; i < 13; i++ {
ce[4 * i + 0] = xl ^ mc0
ce[4 * i + 1] = xl ^ mc1
ce[4 * i + 2] = xl ^ mc2
ce[4 * i + 3] = xl ^ mc3
if (i & 1) > 0 {
yl = row_perm(xl)
} else {
yl = row_perm(rotr(xl, 16))
}
cd[4 * (12 - i) + 0] = yl ^ mc0
cd[4 * (12 - i) + 1] = rotl(yl, 24) ^ mc1
cd[4 * (12 - i) + 2] = rotl(yl, 16) ^ mc2
cd[4 * (12 - i) + 3] = rotl(yl, 8) ^ mc3
xl += 0x3c6ef372
}
}