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1package chaCha20Poly1305Encryption;
2
3import javax.crypto.*;
4import javax.crypto.spec.IvParameterSpec;
5import javax.crypto.spec.SecretKeySpec;
6import java.security.InvalidAlgorithmParameterException;
7import java.security.InvalidKeyException;
8import java.security.NoSuchAlgorithmException;
9import java.security.spec.AlgorithmParameterSpec;
10import java.util.Base64;
11
12public class ChaCha20Poly1305 {
13
14    public static byte[] encrypt(byte[] data, SecretKey key) throws NoSuchPaddingException, NoSuchAlgorithmException,
15            InvalidAlgorithmParameterException, InvalidKeyException, BadPaddingException, IllegalBlockSizeException {
16        if(key == null) throw new InvalidKeyException("SecretKey must NOT be NULL");
17
18        byte[] nonceBytes = new byte[12];
19
20        // Get Cipher Instance
21        Cipher cipher = Cipher.getInstance("ChaCha20-Poly1305/None/NoPadding");
22
23        // Create IvParamterSpec
24        AlgorithmParameterSpec ivParameterSpec = new IvParameterSpec(nonceBytes);
25
26        // Create SecretKeySpec
27        SecretKeySpec keySpec = new SecretKeySpec(key.getEncoded(), "ChaCha20");
28
29        // Initialize Cipher for ENCRYPT_MODE
30        cipher.init(Cipher.ENCRYPT_MODE, keySpec, ivParameterSpec);
31
32        // Perform Encryption
33        return cipher.doFinal(data);
34    }
35
36    public static byte[] decrypt(byte[] cipherText, SecretKey key) throws Exception {
37        if(key == null) throw new InvalidKeyException("SecretKey must NOT be NULL");
38        byte[] nonceBytes = new byte[12];
39
40        // Get Cipher Instance
41        Cipher cipher = Cipher.getInstance("ChaCha20-Poly1305/None/NoPadding");
42
43        // Create IvParamterSpec
44        AlgorithmParameterSpec ivParameterSpec = new IvParameterSpec(nonceBytes);
45
46        // Create SecretKeySpec
47        SecretKeySpec keySpec = new SecretKeySpec(key.getEncoded(), "ChaCha20");
48
49        // Initialize Cipher for DECRYPT_MODE
50        cipher.init(Cipher.DECRYPT_MODE, keySpec, ivParameterSpec);
51
52        // Perform Decryption
53        return cipher.doFinal(cipherText);
54    }
55
56    public static void main(String[] args) throws Exception {
57        SecretKey key = ChaCha20Poly1305KeyGenerator.generateKey();
58
59        String testMessage = "hallo!";
60        byte[] encryptedBytes = encrypt(testMessage.getBytes(), key);
61        String decryptedMessage = new String(decrypt(encryptedBytes,key));
62        System.out.println("testMessage: " + testMessage);
63        System.out.println(key.getAlgorithm() + " SecretKey: " + Base64.getEncoder().encodeToString(key.getEncoded()));
64        System.out.println("encryptedBytes: " + Base64.getEncoder().encodeToString(encryptedBytes));
65        System.out.println("decryptedMessage: "+ decryptedMessage);
66
67    }
68}