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1package AesEncryption;
2
3import javax.crypto.Cipher;
4import javax.crypto.spec.SecretKeySpec;
5import java.util.Random;
6
7public class AdvancedEncryptionStandard {
8    private byte[] key;
9    private static final String ALGORITHM = "AES";
10
11    //     Encrypts the given plain text
12    public byte[] encrypt(String plainText) throws Exception {
13        SecretKeySpec secretKey = new SecretKeySpec(key, ALGORITHM);
14        Cipher cipher = Cipher.getInstance(ALGORITHM);
15        cipher.init(Cipher.ENCRYPT_MODE, secretKey);
16        byte[] encryptedData = cipher.doFinal(plainText.getBytes("UTF-8"));
17        return encryptedData;
18    }
19
20    //    Decrypts the given byte array
21    public String decrypt(byte[] cipherText) throws Exception {
22        SecretKeySpec secretKey = new SecretKeySpec(key, ALGORITHM);
23        Cipher cipher = Cipher.getInstance(ALGORITHM);
24        cipher.init(Cipher.DECRYPT_MODE, secretKey);
25        String decryptedData = new String(cipher.doFinal(cipherText));
26        return decryptedData;
27    }
28
29    //    creates random key for aes encryption
30    public static byte[] createRandomKey(int size) {
31        String SALTCHARS = "ABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890abcdefghijklmnopqrstuvwxyz!§$%&/()=?*'#+-:;.,_";
32        StringBuilder salt = new StringBuilder();
33        Random rnd = new Random();
34        while (salt.length() < size) { // length of key
35            int index = (int) (rnd.nextFloat() * SALTCHARS.length());
36            salt.append(SALTCHARS.charAt(index));
37        }
38
39        return salt.toString().getBytes();
40    }
41
42    public AdvancedEncryptionStandard(byte[] key) {
43        this.key = key;
44    }
45}