Android aes 加密垫块损坏
我正在使用下面的方法，如果我输入正确的密钥，一切都会正常工作。 但是，如果我输入错误的密钥，我会收到 BadPaddingException：填充块已损坏... 我做错了什么吗？
public void initKey(String passwd, byte[] salt) throws NoSuchAlgorithmException, InvalidKeySpecException, NoSuchProviderException{
byte[] localsalt = salt;
PBEKeySpec password = new PBEKeySpec(passwd.toCharArray(),localsalt, 1024,128);//, localsalt, 1000, 128); //128bit enc aes
SecretKeyFactory factory = SecretKeyFactory.getInstance("PBEWithMD5And128BitAES-CBC-OpenSSL","BC");
PBEKey key = (PBEKey) factory.generateSecret(password);
encKey = new SecretKeySpec(key.getEncoded(), "AES");
}
public String txt2enc(String etxt) throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, IllegalBlockSizeException, BadPaddingException, UnsupportedEncodingException {
final Cipher cipher = Cipher.getInstance("AES");//AES
cipher.init(Cipher.ENCRYPT_MODE, encKey);
byte[] encrypted = cipher.doFinal((etxt).getBytes("UTF-8"));
return Base64.encodeToString(encrypted, 0);
}
//decryption
public String txt2dec(String dtxt) throws InvalidKeyException, NoSuchAlgorithmException, NoSuchPaddingException, IllegalBlockSizeException, BadPaddingException, UnsupportedEncodingException{
final Cipher cipher = Cipher.getInstance("AES");
cipher.init(Cipher.DECRYPT_MODE, encKey);
byte[] decrypt = cipher.doFinal(Base64.decode(dtxt, 0));
return new String(decrypt);//return Base64.encodeToString(decrypt, 0);
}
I am using the methods below and if I enter the right key everything works fine.
But if I enter a wrong key I am receiving a BadPaddingException:pad block corrupted...
Am I doing something wrong?
public void initKey(String passwd, byte[] salt) throws NoSuchAlgorithmException, InvalidKeySpecException, NoSuchProviderException{
byte[] localsalt = salt;
PBEKeySpec password = new PBEKeySpec(passwd.toCharArray(),localsalt, 1024,128);//, localsalt, 1000, 128); //128bit enc aes
SecretKeyFactory factory = SecretKeyFactory.getInstance("PBEWithMD5And128BitAES-CBC-OpenSSL","BC");
PBEKey key = (PBEKey) factory.generateSecret(password);
encKey = new SecretKeySpec(key.getEncoded(), "AES");
}
public String txt2enc(String etxt) throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, IllegalBlockSizeException, BadPaddingException, UnsupportedEncodingException {
final Cipher cipher = Cipher.getInstance("AES");//AES
cipher.init(Cipher.ENCRYPT_MODE, encKey);
byte[] encrypted = cipher.doFinal((etxt).getBytes("UTF-8"));
return Base64.encodeToString(encrypted, 0);
}
//decryption
public String txt2dec(String dtxt) throws InvalidKeyException, NoSuchAlgorithmException, NoSuchPaddingException, IllegalBlockSizeException, BadPaddingException, UnsupportedEncodingException{
final Cipher cipher = Cipher.getInstance("AES");
cipher.init(Cipher.DECRYPT_MODE, encKey);
byte[] decrypt = cipher.doFinal(Base64.decode(dtxt, 0));
return new String(decrypt);//return Base64.encodeToString(decrypt, 0);
}
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你没有做错任何事。这是预期的。从技术上讲，这与 Java 加密问题 重复（似乎不容易找到）。请参阅此答案以获得很好的解释。您可以考虑添加 MAC（消息身份验证代码）来安全地完成类似于校验和的操作。
You're not doing anything wrong. It's expected. This is technically a duplicate of Java Encryption issue (which doesn't seem to be easy to find). See this answer for a good explanation. You can consider adding a MAC (Message Authentication Code) to safely accomplish something more like a checksum.
除了提供错误的密钥之外，我不这么认为:)
堆栈跟踪会有所帮助，这样我们就可以看到哪个函数抛出了 BadPaddingException。
这很可能是因为“坏”密钥与“好”密钥的长度不同 - “坏”密钥是来自 initKey() 还是其他地方？
最好的祝愿，
菲尔·莱洛
Other than supplying the wrong key, I don't think so :)
A stack trace would help, so we can see which function is throwing the BadPaddingException.
This may well be because the 'bad' key is a different length to the 'good' key - does the 'bad' key come out of initKey() or somewhere else?
Best wishes,
Phil Lello