AES加密解密工具

AesUtil.java

/**
 * AES utility
 *
 * @author yanganyu
 * @date 2019/9/18 21:01
 */
public class AesUtil {
    private static SecretKeySpec secretKey;

    private AesUtil() {
    }

    private static void setKey(String myKey) {
        try {
            byte[] key = myKey.getBytes(StandardCharsets.UTF_8);
            MessageDigest sha = MessageDigest.getInstance("SHA-1");
            key = sha.digest(key);
            key = Arrays.copyOf(key, 16);
            secretKey = new SecretKeySpec(key, "AES");
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }
    }

    public static String encrypt(String strToEncrypt, String secret) {
        try {
            setKey(secret);
            Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
            cipher.init(Cipher.ENCRYPT_MODE, secretKey);
            return Base64.getEncoder().encodeToString(cipher.doFinal(strToEncrypt.getBytes(StandardCharsets.UTF_8)));
        } catch (Exception e) {
            throw new RuntimeException("Error while encrypting", e);
        }
    }

    public static String decrypt(String strToDecrypt, String secret) {
        try {
            setKey(secret);
            Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5PADDING");
            cipher.init(Cipher.DECRYPT_MODE, secretKey);
            return new String(cipher.doFinal(Base64.getDecoder().decode(strToDecrypt)));
        } catch (Exception e) {
            throw new RuntimeException("Error while decrypting", e);
        }
    }
}