我從文件中檢索文本密碼作爲輸入,並在該解密過程中應用AES加密。 當我第一次這樣做時,5次中的每4次正確運行(加密解密成功),但是1次,它拋出BadPaddingException。以下是我寫的:無效密鑰異常
//ABCD is class name
public static void enc(String fileName, String pwd) {
try {
Properties prop = new Properties();
InputStream input = ABCD.class.getClassLoader().getResourceAsStream(fileName);
prop.load(input);
input.close();
URL url = ABCD.class.getClassLoader().getResource(fileName);
FileOutputStream outputStream = new FileOutputStream(url.getPath());
KeyGenerator key = KeyGenerator.getInstance("AES");
key.init(128);
SecretKey aesKey = key.generateKey();
String newkey = new String(Base64.encode(aesKey.getEncoded()).getBytes("UTF-8"));
Cipher aesCipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
aesCipher.init(Cipher.ENCRYPT_MODE, aesKey);
byte[] clear = pwd.getBytes("UTF-8");
byte[] cipher = aesCipher.doFinal(clear);
String encPwd = new String(cipher);
prop.setProperty("password", encPwd);
prop.setProperty("secKey", newkey);
prop.store(outputStream, null);
outputStream.close();
} catch (Exception e) {
System.out.println(e);
}
}
public static String dec(Properties prop, String fileName) {
String decPwd = ABCD.map.get(fileName);
try {
String newkey = prop.getProperty("secKey");
StringBuilder pwd;
byte[] newkeybuff = Base64.decode(newkey.getBytes("UTF-8"));
SecretKey key = new SecretKeySpec(newkeyuff, "AES");
Cipher aesCipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
aesCipher.init(Cipher.DECRYPT_MODE, key);
pwd = new StringBuilder(prop.getProperty("password"));
byte[] cipher = aesCipher.doFinal(pwd.toString().getBytes());
decPwd = new String(cipher);
} catch (Exception e) {
System.out.println(e);
}
ABCD.map.put(fileName, decPwd);
return decPwd;
}
我需要解決這個問題。在某處,我讀到了BadPaddingExcpetion,因爲使用String完成的操作取代了實際應該使用字節的地方。因此,我改變了我的代碼如下:
public static void enc(String fileName, String pwd) {
try {
Properties prop = new Properties();
InputStream input = ABCD.class.getClassLoader().getResourceAsStream(fileName);
prop.load(input);
input.close();
URL url = ABCD.class.getClassLoader().getResource(fileName);
FileOutputStream outputStream = new FileOutputStream(url.getPath());
KeyGenerator key = KeyGenerator.getInstance("AES");
key.init(128);
SecretKey aesKey = key.generateKey();
byte[] newkey=(Base64.encode(aesKey.getEncoded())).getBytes("UTF-8");
Cipher aesCipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
aesCipher.init(Cipher.ENCRYPT_MODE, aesKey,new IvParameterSpec(new byte[16]));
byte[] clear = pwd.getBytes("UTF-8");
byte[] cipher = aesCipher.doFinal(clear);
prop.setProperty("password", Arrays.toString(cipher));
prop.setProperty("secKey", Arrays.toString(newkey));
prop.store(outputStream, null);
outputStream.flush();
outputStream.close();
} catch (Exception e) {
System.out.println(e);
}
}
public static String dec(Properties prop, String fileName) {
String decPwd = ABCD.map.get(fileName);
try {
byte[] newkey=prop.getProperty("secKey").getBytes("UTF-8");
byte[] pwd;
byte[] newkeybuff = Base64.decode(newkey);
SecretKeySpec key = new SecretKeySpec(newkeybuff, "AES");
Cipher aesCipher=Cipher.getInstance("AES/CBC/PKCS5Padding");
aesCipher.init(Cipher.DECRYPT_MODE, key,new IvParameterSpec(new byte[16]));
pwd = prop.getProperty("password").getBytes();
byte[] cipher = aesCipher.doFinal(pwd);
decPwd=new String(cipher);
System.out.println("Decrypted pwd " + decPwd);
}
catch (Exception e) {
System.out.println(e);
}
ABCD.map.put(fileName, decPwd);
return decPwd;
}
現在,我越來越InvalidKeyException異常。這一次,我讀到該密鑰的大小應該是16個字節。但我不知道如何應用這個。需要解決這個問題!
您的代碼很難修復。我建議你使用一些可用的例子,像http://stackoverflow.com/questions/15554296/simple-java-aes-encrypt-decrypt-example – pedrofb