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@Slf4j
@Component
public class AESUtil {

    @Value("${aes.secret.key}")
    private String secretKey;

    @Value("${aes.iv}")
    private String iv;

    public String decrypt(String encryptedText) throws Exception {
        IvParameterSpec ivSpec = new IvParameterSpec(iv.getBytes(StandardCharsets.UTF_8));
        SecretKeySpec skeySpec = new SecretKeySpec(secretKey.getBytes(StandardCharsets.UTF_8), "AES");
        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5PADDING");
        cipher.init(Cipher.DECRYPT_MODE, skeySpec, ivSpec);

        byte[] original = cipher.doFinal(Base64.getDecoder().decode(encryptedText));

        return new String(original, StandardCharsets.UTF_8);
    }

    public String encrypt(String plainText) throws Exception {
        IvParameterSpec ivSpec = new IvParameterSpec(iv.getBytes(StandardCharsets.UTF_8));
        SecretKeySpec skeySpec = new SecretKeySpec(secretKey.getBytes(StandardCharsets.UTF_8), "AES");

        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5PADDING");
        cipher.init(Cipher.ENCRYPT_MODE, skeySpec, ivSpec);

        byte[] encrypted = cipher.doFinal(plainText.getBytes(StandardCharsets.UTF_8));

        return Base64.getEncoder().encodeToString(encrypted);
    }
}