5CFP3x2m

1package org.example.bouncyzeneca;
2
3import org.bouncycastle.crypto.StreamCipher;
4import org.bouncycastle.crypto.engines.HC128Engine;
5import org.bouncycastle.crypto.params.KeyParameter;
6
7import java.io.UnsupportedEncodingException;
8import java.nio.charset.StandardCharsets;
9import java.util.Base64;
10
11public class App {
12    private static String encrypt(String plaintext, String secretKey) {
13        final StreamCipher cipher;
14        byte[] secretKeyBytes = secretKey.getBytes(StandardCharsets.UTF_8);
15
16        byte[] plaintextBytes;
17        plaintextBytes = plaintext.getBytes(StandardCharsets.UTF_8);
18
19        byte[] encryptedBytes = new byte[plaintextBytes.length];
20
21        cipher = new HC128Engine();
22        KeyParameter keyParameter = new KeyParameter(secretKeyBytes);
23
24        cipher.init(true, keyParameter);
25
26        cipher.processBytes(plaintextBytes, 0, plaintextBytes.length, encryptedBytes, 0);
27        return Base64.getEncoder().encodeToString(encryptedBytes);
28    }
29
30    private static String decrypt(String ciphertext, String secretKey) {
31        final StreamCipher cipher;
32        byte[] byteSecretKey = secretKey.getBytes(StandardCharsets.UTF_8);
33        byte[] ciphertextBytes = Base64.getDecoder().decode(ciphertext.getBytes(StandardCharsets.UTF_8));
34        byte[] plaintextBytes = new byte[ciphertextBytes.length];
35
36        cipher = new HC128Engine();
37        KeyParameter keyParameter = new KeyParameter(byteSecretKey);
38
39        cipher.init(false, keyParameter);
40
41        cipher.processBytes(ciphertextBytes, 0, ciphertextBytes.length, plaintextBytes, 0);
42        return new String(plaintextBytes);
43    }
44    public static void main(String[] args) throws UnsupportedEncodingException {
45        String secretKey = "1234567890abcdef";
46        String plaintext = "Alice got vaccinated";
47
48        String encryptedText = encrypt(plaintext, secretKey);
49        System.out.println("Encrypted text:");
50        System.out.println(encryptedText);
51
52        String decryptedText = decrypt(encryptedText, secretKey);
53        System.out.println("Decrypted text:");
54        System.out.println(decryptedText);
55
56    }
57}
58