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utils.go
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utils.go
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package square
import (
"encoding/binary"
)
// Endianness option
const littleEndian bool = false
func bytesToUint16s(b []byte) []uint16 {
size := len(b) / 2
dst := make([]uint16, size)
for i := 0; i < size; i++ {
j := i * 2
if littleEndian {
dst[i] = binary.LittleEndian.Uint16(b[j:])
} else {
dst[i] = binary.BigEndian.Uint16(b[j:])
}
}
return dst
}
func uint16sToBytes(w []uint16) []byte {
size := len(w) * 2
dst := make([]byte, size)
for i := 0; i < len(w); i++ {
j := i * 2
if littleEndian {
binary.LittleEndian.PutUint16(dst[j:], w[i])
} else {
binary.BigEndian.PutUint16(dst[j:], w[i])
}
}
return dst
}
func bytesToUint16(inp []byte) (blk uint16) {
if littleEndian {
blk = binary.LittleEndian.Uint16(inp[0:])
} else {
blk = binary.BigEndian.Uint16(inp[0:])
}
return
}
func uint16ToBytes(blk uint16) [2]byte {
var sav [2]byte
if littleEndian {
binary.LittleEndian.PutUint16(sav[0:], blk)
} else {
binary.BigEndian.PutUint16(sav[0:], blk)
}
return sav
}
const R = 8 /* number of rounds */
const ROOT = 0x1f5 /* polynomial for generating GF(2^8) */
var S_GAMMA = [0x100]uint16{
0xb1,0xce,0xc3,0x95,0x5a,0xad,0xe7,0x02,0x4d,0x44,0xfb,0x91,0x0c,0x87,0xa1,0x50,
0xcb,0x67,0x54,0xdd,0x46,0x8f,0xe1,0x4e,0xf0,0xfd,0xfc,0xeb,0xf9,0xc4,0x1a,0x6e,
0x5e,0xf5,0xcc,0x8d,0x1c,0x56,0x43,0xfe,0x07,0x61,0xf8,0x75,0x59,0xff,0x03,0x22,
0x8a,0xd1,0x13,0xee,0x88,0x00,0x0e,0x34,0x15,0x80,0x94,0xe3,0xed,0xb5,0x53,0x23,
0x4b,0x47,0x17,0xa7,0x90,0x35,0xab,0xd8,0xb8,0xdf,0x4f,0x57,0x9a,0x92,0xdb,0x1b,
0x3c,0xc8,0x99,0x04,0x8e,0xe0,0xd7,0x7d,0x85,0xbb,0x40,0x2c,0x3a,0x45,0xf1,0x42,
0x65,0x20,0x41,0x18,0x72,0x25,0x93,0x70,0x36,0x05,0xf2,0x0b,0xa3,0x79,0xec,0x08,
0x27,0x31,0x32,0xb6,0x7c,0xb0,0x0a,0x73,0x5b,0x7b,0xb7,0x81,0xd2,0x0d,0x6a,0x26,
0x9e,0x58,0x9c,0x83,0x74,0xb3,0xac,0x30,0x7a,0x69,0x77,0x0f,0xae,0x21,0xde,0xd0,
0x2e,0x97,0x10,0xa4,0x98,0xa8,0xd4,0x68,0x2d,0x62,0x29,0x6d,0x16,0x49,0x76,0xc7,
0xe8,0xc1,0x96,0x37,0xe5,0xca,0xf4,0xe9,0x63,0x12,0xc2,0xa6,0x14,0xbc,0xd3,0x28,
0xaf,0x2f,0xe6,0x24,0x52,0xc6,0xa0,0x09,0xbd,0x8c,0xcf,0x5d,0x11,0x5f,0x01,0xc5,
0x9f,0x3d,0xa2,0x9b,0xc9,0x3b,0xbe,0x51,0x19,0x1f,0x3f,0x5c,0xb2,0xef,0x4a,0xcd,
0xbf,0xba,0x6f,0x64,0xd9,0xf3,0x3e,0xb4,0xaa,0xdc,0xd5,0x06,0xc0,0x7e,0xf6,0x66,
0x6c,0x84,0x71,0x38,0xb9,0x1d,0x7f,0x9d,0x48,0x8b,0x2a,0xda,0xa5,0x33,0x82,0x39,
0xd6,0x78,0x86,0xfa,0xe4,0x2b,0xa9,0x1e,0x89,0x60,0x6b,0xea,0x55,0x4c,0xf7,0xe2,
}
func xtime(x uint16) uint16 {
/* multiply with 2 in the Galois Field
*/
x <<= 1
if (x & 0x100) != 0 {
x ^= ROOT
}
return x;
}
func theta(a [16]uint16) {
var i, j int32
var b [16]uint16
for i = 0; i < 4; i++ {
for j = 0; j < 4; j++ {
b[4*i+j] = xtime(a[4*i + j])
b[4*i+j] ^= a[4*i + ((j+1)%4)]
b[4*i+j] ^= xtime(a[4*i + ((j+1)%4)])
b[4*i+j] ^= a[4*i + ((j+2)%4)]
b[4*i+j] ^= a[4*i + ((j+3)%4)]
}
}
for j = 0; j < 16; j++ {
a[j] = b[j]
}
}
func gamma(a [16]uint16) {
var i int32
for i = 0; i < 16; i++ {
a[i] = S_GAMMA[uint8(a[i])]
}
}
func pi(a [16]uint16) {
var tmp uint16
tmp = a[1]
a[1] = a[4]
a[4] = tmp
tmp = a[2]
a[2] = a[8]
a[8] = tmp
tmp = a[6]
a[6] = a[9]
a[9] = tmp
tmp = a[3]
a[3] = a[0xC]
a[0xC] = tmp
tmp = a[7]
a[7] = a[0xD]
a[0xD] = tmp
tmp = a[0xB]
a[0xB] = a[0xE]
a[0xE] = tmp
}
func sigma(a [16]uint16, rk [16]uint16) {
var i int32
for i = 0; i < 16; i++ {
a[i] ^= rk[i]
}
}
func keysched(rk [16]uint16, prcon *uint16) {
var tmp uint16
tmp = rk[0xC]
rk[0] ^= *prcon
rk[0] ^= rk[0xD]
rk[4] ^= rk[0]
rk[8] ^= rk[4]
rk[0xC] ^= rk[8]
rk[1] ^= rk[0xE]
rk[5] ^= rk[1]
rk[9] ^= rk[5]
rk[0xD] ^= rk[9]
rk[2] ^= rk[0xF]
rk[6] ^= rk[2]
rk[0xA] ^= rk[6]
rk[0xE] ^= rk[0xA]
rk[3] ^= tmp
rk[7] ^= rk[3]
rk[0xB] ^= rk[7]
rk[0xF] ^= rk[0xB]
*prcon = xtime(*prcon)
}