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tryinitio.go
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tryinitio.go
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// 20 october 2015
package main
import (
"fmt"
"os"
"io/ioutil"
"crypto/aes"
"bytes"
"encoding/binary"
"encoding/hex"
)
var pi = []byte{
0x03, 0x14, 0x15, 0x92, 0x65, 0x35, 0x89, 0x79, 0x32, 0x38, 0x46, 0x26, 0x43, 0x38, 0x32, 0x79,
0xFC, 0xEB, 0xEA, 0x6D, 0x9A, 0xCA, 0x76, 0x86, 0xCD, 0xC7, 0xB9, 0xD9, 0xBC, 0xC7, 0xCD, 0x86,
}
func reverse(b []byte) {
for i := 0; i < len(b) / 2; i++ {
n := len(b) - i - 1
b[i], b[n] = b[n], b[i]
}
}
func swap(b []byte) {
for i := 0; i < len(b); i += 4 {
b[i + 0], b[i + 3] = b[i + 3], b[i + 0]
b[i + 1], b[i + 2] = b[i + 2], b[i + 1]
}
}
func fliphalves(b []byte) {
c := make([]byte, len(b))
copy(c, b[16:])
copy(c[16:], b)
copy(b, c)
}
func decryptDEK(dek []byte, key []byte) error {
fliphalves(key)
reverse(key)
c, err := aes.NewCipher(key)
if err != nil {
return err
}
for i := 0; i < len(dek); i += 16 {
swap(dek[i:i + 16])
c.Decrypt(dek[i:], dek[i:])
// don't swap back; it'll be correct this way
}
return nil
}
type Initio struct {
Magic [4]byte // 27 5D BA 35
Unknown [8]byte
Key [32]byte // stored as little-endian longs
}
var errWrongChip = fmt.Errorf("wrong chip")
func ReadInitio(dek []byte) (j *Initio, err error) {
i := 0x190
if dek[i] == 0x27 &&
dek[i + 1] == 0x5D &&
dek[i + 2] == 0xBA &&
dek[i + 3] == 0x35 {
// do nothing
} else {
return nil, errWrongChip
}
j = new(Initio)
r := bytes.NewReader(dek[i:])
err = binary.Read(r, binary.LittleEndian, j)
if err != nil {
return nil, err
}
swap(j.Key[:])
return j, nil
}
func main() {
fdek, _ := os.Open(os.Args[1])
fblock, _ := os.Open(os.Args[2])
dek, _ := ioutil.ReadAll(fdek)
block, _ := ioutil.ReadAll(fblock)
fdek.Close()
fblock.Close()
decryptDEK(dek, pi)
j, err := ReadInitio(dek)
if err != nil { panic(err) }
key := make([]byte, len(j.Key))
copy(key, j.Key[:])
fliphalves(key)
reverse(key)
c, _ := aes.NewCipher(key)
for i := 0; i < len(block); i += 16 {
// reverse(block[i:i + 16])
swap(block[i:i + 16])
c.Decrypt(block[i:], block[i:])
// we DO need to swap after this though
swap(block[i:i + 16])
}
fmt.Println(hex.Dump(block))
}