网站右侧虚代码网络推广宣传方式
首先定义一组密钥,加密和解密使用同一组密钥
private final String key = "hahahahahaha";
也可以随机生成密钥
/**
* 生成随机密钥
* @param keySize 密钥大小推荐128 256
* @return
* @throws NoSuchAlgorithmException
*/
public static String generateSecret(int keySize) throws NoSuchAlgorithmException {
KeyGenerator generator = KeyGenerator.getInstance("AES");
generator.init(keySize, new SecureRandom());
SecretKey key = generator.generateKey();
return byteToHexString(key.getEncoded());
}
加密
/**
* 加密
* @param strToEncrypt 待加密字符串
* @param secret 密钥
* @return 密文
* @throws UnsupportedEncodingException
* @throws NoSuchAlgorithmException
* @throws NoSuchPaddingException
* @throws InvalidKeyException
* @throws BadPaddingException
* @throws IllegalBlockSizeException
*/
public static String encrypt(String strToEncrypt, String secret) throws UnsupportedEncodingException, NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, BadPaddingException, IllegalBlockSizeException {
SecretKeySpec secretKey = getKey(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)));
}
解密
/**
* 解密
* @param strToDecrypt 待解密字符串
* @param secret 密钥
* @return 明文
* @throws UnsupportedEncodingException
* @throws NoSuchAlgorithmException
* @throws NoSuchPaddingException
* @throws InvalidKeyException
* @throws BadPaddingException
* @throws IllegalBlockSizeException
*/
public static String decrypt(String strToDecrypt, String secret) throws UnsupportedEncodingException, NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, BadPaddingException, IllegalBlockSizeException {
SecretKeySpec secretKey = getKey(secret);
Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5PADDING");
cipher.init(Cipher.DECRYPT_MODE, secretKey);
return new String(cipher.doFinal(Base64.getDecoder().decode(strToDecrypt)));
}