Java使用AES算法

package gj.secure;

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.nio.charset.StandardCharsets;
import java.util.Base64;

/**
 * @author areful
 */
public class AESUtil {
    public static final String KEY_ALGORITHM = "AES";
    public static final String CIPHER_ALGORITHM_CBC = "AES/CBC/PKCS5Padding";
    public static final String CIPHER_ALGORITHM_ECB = "AES/ECB/PKCS5Padding";

    public static byte[] initKey() throws Exception {
        KeyGenerator kg = KeyGenerator.getInstance(KEY_ALGORITHM);
        kg.init(128);
        return kg.generateKey().getEncoded();
    }

    public static byte[] encrypt(byte[] data, byte[] key) throws Exception {
        Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM_ECB);
        cipher.init(Cipher.ENCRYPT_MODE, new SecretKeySpec(key, KEY_ALGORITHM));
        return cipher.doFinal(data);
    }

    public static byte[] decrypt(byte[] data, byte[] key) throws Exception {
        Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM_ECB);
        cipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec(key, KEY_ALGORITHM));
        return cipher.doFinal(data);
    }

    public static byte[] encrypt(byte[] data, byte[] key, byte[] iv) throws Exception {
        Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM_CBC);
        cipher.init(Cipher.ENCRYPT_MODE, new SecretKeySpec(key, KEY_ALGORITHM), new IvParameterSpec(iv));
        return cipher.doFinal(data);
    }

    public static byte[] decrypt(byte[] data, byte[] key, byte[] iv) throws Exception {
        Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM_CBC);
        cipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec(key, KEY_ALGORITHM), new IvParameterSpec(iv));
        return cipher.doFinal(data);
    }

    public static void main(String[] args) throws Exception {
        byte[] text = "Hello, AES cipher!".getBytes(StandardCharsets.UTF_8);
        byte[] key = "0123456789abcdef".getBytes();
        byte[] iv = "abcdefghijklmnop".getBytes();

        byte[] cipherText = encrypt(text, key, iv);
        String base64String = Base64.getEncoder().encodeToString(cipherText);
        System.out.println(base64String);

        byte[] plainText = decrypt(Base64.getDecoder().decode(base64String), key, iv);
        System.out.println(new String(plainText, StandardCharsets.UTF_8));
    }
}