我有一个从 Java 客户端接收消息的 Java HTTP 服务器。
服务器和客户端都使用相同的 Encrypter 类：
public class Encrypter {
private Cipher cipher; //The encryption cipher object
public static final String ALGORITHM = "Blowfish"; //Encryption Algorithm
/**
* Constructor
*/
public Encrypter()
{
try {
initlizeCipher();
} catch (Throwable e) {
ServerSettings.LOG.logError(e);
e.printStackTrace();
}
}
/**
* Initialize the Cipher object
* @throws NoSuchAlgorithmException
* @throws NoSuchPaddingException
*/
private void initlizeCipher() throws NoSuchAlgorithmException, NoSuchPaddingException
{
cipher = Cipher.getInstance(ServerSettings.ALGORITHM);
}
/**
* Encrypt a String
* @param string String to encrypt
* @return an encrypted String
* @throws InvalidKeyException
* @throws IllegalBlockSizeException
* @throws BadPaddingException
* @throws UnsupportedEncodingException
*/
public synchronized String encrypt(String string) throws InvalidKeyException, IllegalBlockSizeException, BadPaddingException, UnsupportedEncodingException
{
cipher.init(Cipher.ENCRYPT_MODE, ServerSettings.SECRECT_KEY_SPEC);
byte[] stringBytes = string.getBytes("UTF-8");
byte[] encryptedBytes = cipher.doFinal(stringBytes);
return Base64.encodeBytes(encryptedBytes);
}
/**
* Decrypt a String
* @param string String to decrypt
* @return a decrypted String
* @throws InvalidKeyException
* @throws IllegalBlockSizeException
* @throws BadPaddingException
* @throws IOException
*/
public synchronized String decrypt(String string) throws InvalidKeyException, IllegalBlockSizeException, BadPaddingException, IOException
{
cipher.init(Cipher.DECRYPT_MODE, ServerSettings.SECRECT_KEY_SPEC);
byte[] decryptedBytes = Base64.decode(string.getBytes());
byte[] encryptedBytes = cipher.doFinal(decryptedBytes);
return new String(encryptedBytes,"UTF-8");
}
}
当发送的变量是：m=encryptedMessage.
由于某种原因，我总是得到
javax.crypto.IllegalBlockSizeException: Input length must be multiple of 8 when decrypting with padded cipher
而且我无法解密在服务器端收到的消息..
起初我以为消息可能已损坏，但事实并非如此..
有任何想法吗 ？
更新1：
奇怪的是，一些发往服务器的消息被正确解密，而一些则返回该错误。好消息：
zuhRpmbtH0xSmv6cnBFkAxaGFmRbDP/97LwF4bcDyhANCTLb4afBzFpP3GI1pGFLok03GRQVCwi81Hsp bCpGtuoIVY9cqWYDzNFgOCx5w2sboR2Qx6oxtTSIFIzj1XadQdk9V8lCxcCVVYEH8vA3tph63wU6qJOo OyROz0OJauLBEiWbn5OUQxJ7Yz9Qc1wzl8z7UQb71v4pswF69c1CM/LWWmAzBDCjlRQ5YIB9wN8mBgoC t8Ngt38XkCg/yRHh0EpXYQfrgP6Ls5I8/FY8BQorMy/le5y2
坏消息：
cjj7yzW v3NDtbIJXurrrf318DcY PBk2inzSfz qoIaTKns2tWvR7ftOKK30XY VAlXDrQlyTLatgKA S4IkAIK3lXQKNcwPh87CybHrTqD3HWEM3tqkpVWdB7GNmpHYsITTLrWsBvaMeDcXEr/gr9KYSZ0ks0gR z12jHxPiZoSKHdy5nZ4zShHUy/wlkslmjFvA1G8A15nTVBhjBI GWSh54tyBZF113lL pm5eZNkZrqzo RWI2QAjfqNPzCpV0tqd/pEO70vdSLbCYi7V0bVQNW2KpBv3Hj3VOTCP92k62/iQhIY4F VuMo2UTgGWV 1fqoelrl/eelAvsZO8YNC5/2KTKw2sDFaTOwW9R12AgeyzOuhkKQQro2Umd0KoiGnYL9AaQ6 T2MBnLK ZyROHh3cvI T9chPlGfmUHbCN2f3pHoF5rb383KpJNjvlnmnwtaEhQYw8TQjj4PLenK24Hpcs4 wO8gu XSrUglFzLIkkwjvsA5AyTHx/jP9AwMSnWjDwco184YQGAePeM8PYy42oMOaw7Pg/3jWFy1uOzFok2LN9 RJWv1iyXejh5s9zXoAT3kywICQygK2YTLZNIS1d5lc0H0f15EN6itZhaR0YnslhYGmH1KcNwdMWhBKsf PytWnK0N8AzUVzt4P4mtmGSuaLi2t54J2pv7m7/c6WjTi1/E16rd3QyWkmXrghSshOJNRRwcydlhhTLH drHTEFaXSPZyVFqlaFu4 f5kxiBa6ewglKHe6zbmRyM15Mq3lRj8Ab/RWBd2tgvaEO/vhw
这两条消息都以相同的方式发送并打印到 System.Out 进行测试。正如您所见，由于某种原因，坏消息有空格，而好消息却没有可能给出块错误消息。知道如何解决它吗？
更新 2：
在深入研究我的代码后，我发现我的问题出在解析 POST 方法参数的函数内部。我不能说我是编码方面的专家，但是通过 Base64 编码抛出 POST URLEcoding 存在一些问题。
这是我的解析代码，在获取 URLDecode 后会转到我的 Encrypter 进行解密：
private void parseQuery(String query, HashMap parameters) throws UnsupportedEncodingException {
if (query != null) {
String pairs[] = query.split("[&]");
for (String pair : pairs)
{
String param[] = pair.split("[=]");
String key = null;
String value = null;
if (param.length > 0)
key = URLDecoder.decode(param[0], "UTF-8");//System.getProperty("file.encoding"));
if (param.length > 1)
value = URLDecoder.decode(param[1], "UTF-8");//System.getProperty("file.encoding"));
if (parameters.containsKey(key))
{
Object obj = parameters.get(key);
if(obj instanceof List<?>)
{
@SuppressWarnings("unchecked")
List<String> values = (List<String>)obj;
values.add(value);
}
else if(obj instanceof String)
{
List<String> values = new ArrayList<String>();
values.add((String)obj);
values.add(value);
parameters.put(key, values);
}
}
else
parameters.put(key, value);
}
}
}
有任何想法吗 ？