yYxhM37Z

1if(sMacSessionKey.length == 16) {
2    byte []temp  = sMacSessionKey.clone();
3    sMacSessionKey = new byte[24];
4    System.arraycopy(temp,0,sMacSessionKey,0,temp.length);
5    System.arraycopy(temp,0,sMacSessionKey,16,8);
6    }
7
8    byte []cMac = new byte[8];
9    byte []padding = {(byte)0x80,0x00,0x00,0x00,0x00,0x00,0x00,0x00,};
10    int paddingRequired  = 8 - (apdu.length) %8;
11    byte[] data = new byte[apdu.length + paddingRequired];
12    System.arraycopy(apdu, 0, data, 0, apdu.length);
13    System.arraycopy(padding, 0, data, apdu.length,paddingRequired);
14
15            Cipher cipher = Cipher.getInstance("DESede/CBC/NoPadding");
16
17            Cipher singleDesCipher = Cipher.getInstance("DES/CBC/NoPadding",
18                "SunJCE");
19            SecretKeySpec desSingleKey = new SecretKeySpec(sMacSessionKey, 0, 8,
20                "DES");
21            SecretKey secretKey = new SecretKeySpec(sMacSessionKey, "DESede");
22            // Calculate the first n - 1 block. For this case, n = 1
23            IvParameterSpec ivSpec = new IvParameterSpec(icv);
24            singleDesCipher.init(Cipher.ENCRYPT_MODE, desSingleKey, ivSpec);
25            // byte ivForLastBlock[] = singleDesCipher.doFinal(data, 0, 8);
26
27            int blocks = data.length / 8;
28
29            for (int i = 0; i < blocks - 1; i++) {
30                singleDesCipher.init(Cipher.ENCRYPT_MODE, desSingleKey, ivSpec);
31                byte[] block = singleDesCipher.doFinal(data, i * 8, 8);
32                ivSpec = new IvParameterSpec(block);
33            }
34
35            int offset = (blocks - 1) * 8;
36
37            cipher.init(Cipher.ENCRYPT_MODE, secretKey, ivSpec);
38            cMac = cipher.doFinal(data, offset, 8);
39
40            ivSpec = new IvParameterSpec(new byte[8]);
41
42            singleDesCipher.init(Cipher.ENCRYPT_MODE, desSingleKey, ivSpec);
43            icvNextCommand = singleDesCipher.doFinal(cMac);
44            System.out.println("icvNextCommand"+Utility.bytesToHex(icvNextCommand, icvNextCommand.length));
45
46            return cMac;
47
48    }