pbhDy0HK

1package javaapplication28;
2
3import org.bouncycastle.jce.provider.BouncyCastleProvider;
4import java.security.GeneralSecurityException;
5import java.security.Security;
6import javax.crypto.Cipher;
7import javax.crypto.SecretKey;
8import javax.crypto.spec.SecretKeySpec;
9import org.bouncycastle.util.encoders.Hex;
10
11public class JavaApplication28 {
12
13    public static void main(String[] args) throws GeneralSecurityException {
14
15        String key = "DBFE96D0A5F09D24";
16        byte[] bytes = key.getBytes();
17        String kcv = JavaApplication28.getKcv(bytes);
18        System.out.println("key=" + key + ", kcv=" + kcv);
19    }
20
21    // Heavily based on code provided in the article "Calculating the Key Check Value of a key".
22    // https://hk.saowen.com/a/55c92a558ccb3e062970bab22eaa83c5c4d121878925c05f7949b988f61963e3
23    private static String getKcv(byte[] key) throws GeneralSecurityException {
24        // Add Bouncy Castle Security Provider
25        Security.addProvider(new BouncyCastleProvider());
26        // Construct a Secret Key from the given key
27        SecretKey skey = new SecretKeySpec(key, "DESede");
28        // Instantiate a DESede Cipher
29        Cipher encrypter = Cipher.getInstance("DESede/ECB/NoPadding", "BC");
30        // Initialize the cipher with the key in Encrypt mode
31        encrypter.init(Cipher.ENCRYPT_MODE, skey);
32        // Encrypt an 8-byte null array with the cipher and return the first 6 Hex digits of the result
33        return Hex.toHexString(encrypter.doFinal(new byte[8])).substring(0, 6).toUpperCase();
34    }
35}
36	
37run:
38key=DBFE96D0A5F09D24, kcv=F153C7
39BUILD SUCCESSFUL (total time: 0 seconds)