Java use AES128

SecureProviderTest.java

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.PBEParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.security.Key;
import java.security.SecureRandom;
import java.security.Security;
 
public class SecureProviderTest {
    @Test
    public void use_jdk_aes128() throws Exception {
        String source = "Hala Madrid";
        // generate key
        KeyGenerator keyGen = KeyGenerator.getInstance("AES");
        keyGen.init(128);
        SecretKey secretKey = keyGen.generateKey();
        byte[] keyEncoded = secretKey.getEncoded();

        // convert key
        Key key = new SecretKeySpec(keyEncoded, "AES");

        // encrypt
        Cipher encryptCipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
        encryptCipher.init(Cipher.ENCRYPT_MODE, key);
        byte[] encryptBytes = encryptCipher.doFinal(source.getBytes());
        String cipherText = Base64.encodeBase64String(encryptBytes);
        System.out.println("cipher text: " + cipherText);

        // decrypt
        Cipher decryptCipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
        decryptCipher.init(Cipher.DECRYPT_MODE, key);
        byte[] plainBytes = decryptCipher.doFinal(Base64.decodeBase64(cipherText));
        String plainText = new String(plainBytes);
        System.out.println("plain text: " + plainText);
    }

    @Test
    public void use_bc_aes128() throws Exception {
        String source = "Hala Madrid";
        Security.addProvider(new BouncyCastleProvider());

        // generate key
        KeyGenerator keyGenerator = KeyGenerator.getInstance("AES", "BC");
        keyGenerator.init(128);
        SecretKey secretKey = keyGenerator.generateKey();
        byte[] keyEncoded = secretKey.getEncoded();

        // convert key
        Key key = new SecretKeySpec(keyEncoded, "AES");

        // encrypt
        Cipher encryptCipher = Cipher.getInstance("AES/ECB/PKCS7Padding", "BC");
        encryptCipher.init(Cipher.ENCRYPT_MODE, key);
        byte[] encryptBytes = encryptCipher.doFinal(source.getBytes());
        String cipherText = Base64.encodeBase64String(encryptBytes);
        System.out.println("cipher text: " + cipherText);

        // decrypt
        Cipher decryptCipher = Cipher.getInstance("AES/ECB/PKCS7Padding", "BC");
        decryptCipher.init(Cipher.DECRYPT_MODE, key);
        byte[] plainBytes = decryptCipher.doFinal(Base64.decodeBase64(cipherText));
        String plainText = new String(plainBytes);
        System.out.println("plain text: " + plainText);
    }
}