我正在尝试更改android中的默认主密钥（PICC）。我得到的是INTEGRITY ERROR。以下是我的代码。问题可能在于解密。 DES / 3 DES格式是必要的还是AES很好？
private void authenticate() {
byte[] rndB = new byte[8];
byte[] response;
try {
response = desfire.transceive(NATIVE_AUTHENTICATION_COMMAND);
System.arraycopy(response, 1, rndB, 0, 8);
byte[] command = new byte[17];
System.arraycopy(DES.gen_sessionKey(rndB), 0, command, 1, 16);
command[0] = (byte) 0xAF;
response = desfire.transceive(command);
changePICC(DES.gen_sessionKey(rndB));
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
private void changePICC(byte[] rndB) {
byte[] response;
try {
byte[] command = new byte[26];
System.arraycopy(DES.gen_piccKey(rndB), 0, command, 2, 24);
command[0] = (byte) 0xC4;
command[1] = (byte) 0x00;
Log.v("command", ByteArrayToHexString(command));
response = desfire.transceive(command);
Log.v("auth1 response", ByteArrayToHexString(response));
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
这是关键设置类
public class DES {
private static final int POLYNOMIAL = 0x8408;
private static final int PRESET_VALUE = 0x6363;
public static byte[] gen_sessionKey(byte[] b) {
byte[] key = new byte[] { (byte) 0x0, (byte) 0x0, (byte) 0x0, (byte) 0x0, (byte) 0x0, (byte) 0x0, (byte) 0x0,
(byte) 0x0, (byte) 0x0, (byte) 0x0, (byte) 0x0, (byte) 0x0, (byte) 0x0, (byte) 0x0, (byte) 0x0,
(byte) 0x0 };
byte[] response = decrypt(key, b);
byte[] rndB = response;
byte[] rndA = new byte[] { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
byte[] rndAB = new byte[16];
System.arraycopy(rndA, 0, rndAB, 0, 8);
rndB = leftShift(rndB);
rndB = xorBytes(rndA, rndB);
rndB = decrypt(key, rndB);
System.arraycopy(rndB, 0, rndAB, 8, 8);
return rndAB;
}
public static byte[] gen_piccKey(byte[] key) {
byte[] rndA = new byte[] { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
byte[] rndB = new byte[] { 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, (byte) 0x88, (byte) 0x99, (byte) 0xAA, (byte) 0xBB, (byte) 0xCC, (byte) 0xDD, (byte) 0xEE, (byte) 0xFF, (byte) 0xFF };
byte[] rndAB = new byte[24];
rndA = xorBytes(rndA, rndB);
Log.v("xor length", String.valueOf(rndB.length));
byte[] rndABC = iso14443a_crc(rndA);
byte[] rndABB = iso14443a_crc(rndB);
Log.v("rnd length", ByteArrayToHexString(rndABC)+"\n"+ByteArrayToHexString(rndABB));
System.arraycopy(rndA, 0, rndAB, 0, 16);
System.arraycopy(rndABC, 0, rndAB, 16, 2);
System.arraycopy(rndABB, 0, rndAB, 18, 2);
byte[] rndABCD = new byte[] { 0x00, 0x00, 0x00, 0x00};
System.arraycopy(rndABCD, 0, rndAB, 20, 4);
Log.v("final", ByteArrayToHexString(rndAB));
rndAB = decrypt(key , rndAB);
return rndAB;
}
private static byte[] xorBytes(byte[] rndA, byte[] rndB) {
// TODO Auto-generated method stub
byte[] b = new byte[rndB.length];
for (int i = 0; i < rndB.length; i++) {
b[i] = (byte) (rndA[i] ^ rndB[i]);
}
return b;
}
public static byte[] leftShift(byte[] data) {
// TODO Auto-generated method stub
byte[] temp = new byte[data.length];
temp[data.length - 1] = data[0];
for (int i = 1; i < data.length; i++) {
temp[i - 1] = data[i];
}
return temp;
}
public static byte[] decrypt(byte[] key, byte[] enciphered_data) {
try {
byte[] iv = new byte[] { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
IvParameterSpec ivParameterSpec = new IvParameterSpec(iv);
SecretKey s = new SecretKeySpec(key, "DESede");
Cipher cipher;
cipher = Cipher.getInstance("DESede/CBC/NoPadding", "BC");
cipher.init(Cipher.DECRYPT_MODE, s, ivParameterSpec);
byte[] deciphered_data = cipher.doFinal(enciphered_data);
return deciphered_data;
} catch (NoSuchAlgorithmException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (NoSuchProviderException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (NoSuchPaddingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (InvalidKeyException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (InvalidAlgorithmParameterException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalBlockSizeException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (BadPaddingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
static byte[] iso14443a_crc(byte[] Data) // DESFireSAM crc16 do not invert the result
{
int bt;
int wCrc = 0x6363;
int j = 0;
int t8 = 0;
int t9 = 0;
int tA = 0;
int Len = Data.length;
final int maskB = 0x0000000000000000FF;
final int maskW = 0x00000000000000FFFF;
do
{
bt = Data[j++] & maskB;
bt = (bt^(wCrc & 0x00FF)) & maskB;
bt = (bt^(bt<<4)) & maskB;
t8 = (bt << 8) & maskW;
t9 = (bt<<3) & maskW;
tA = (bt>>4) & maskW;
wCrc = (wCrc >> 8)^(t8^t9^tA) & maskW;
}
while (j < Len);
byte[] bb = new byte[2];
bb[0] = (byte) (wCrc & maskB);
bb[1] = (byte) ((wCrc >>8) & maskB);
return bb;
}
private static String ByteArrayToHexString(byte[] inarray) {
int i, j, in;
String[] hex = { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "A", "B", "C", "D", "E", "F" };
String out = "";
for (j = 0; j < inarray.length; ++j) {
in = (int) inarray[j] & 0xff;
i = (in >> 4) & 0x0f;
out += hex[i];
i = in & 0x0f;
out += hex[i];
}
return out;
}
请帮我解决这个问题。