[英]BadPaddingException when decrypting encrypted stream
我正在使用javax.crypto.Cipher
加密文件,然后對其解密,但是我仍然收到BadPaddingException。 下列類從輸入文件接收inputStream
,並從輸出文件接收outputStream
。
Error
13:22:15,049 ERROR [STDERR] javax.crypto.BadPaddingException: Given final block not properly padded
13:22:15,081 ERROR [STDERR] at com.sun.crypto.provider.SunJCE_f.b(DashoA13*..)
13:22:15,096 ERROR [STDERR] at com.sun.crypto.provider.SunJCE_f.b(DashoA13*..)
13:22:15,128 ERROR [STDERR] at com.sun.crypto.provider.AESCipher.engineDoFinal(DashoA13*..)
13:22:15,143 ERROR [STDERR] at javax.crypto.Cipher.doFinal(DashoA13*..)
Code
public class CipherAES implements Cipher {
private static final Logger logger = Logger.getLogger(CipherAES.class);
private Key key;
public CipherAES() {
this.key = generateKey();
}
private Key generateKey() {
try {
KeyGenerator generator;
generator = KeyGenerator.getInstance("AES");
generator.init(new SecureRandom());
return generator.generateKey();
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
}
return null;
}
@Override
public void decrypt(InputStream inputStream, OutputStream outputStream) throws IOException {
try {
javax.crypto.Cipher cipher = javax.crypto.Cipher.getInstance("AES");
cipher.init(javax.crypto.Cipher.DECRYPT_MODE, key);
byte[] raw = IOUtil.toByteArray(inputStream);
byte[] base64Decoded = Base64.decodeBase64(raw);
byte[] decryptedData = cipher.doFinal(base64Decoded);
outputStream.write(decryptedData);
} catch (InvalidKeyException e) {
e.printStackTrace();
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
} catch (NoSuchPaddingException e) {
e.printStackTrace();
} catch (IllegalBlockSizeException e) {
e.printStackTrace();
} catch (BadPaddingException e) {
e.printStackTrace();
} finally {
inputStream.close();
outputStream.close();
}
}
@Override
public void encrypt(InputStream inputStream, OutputStream outputStream) throws IOException {
try {
javax.crypto.Cipher cipher = javax.crypto.Cipher.getInstance("AES");
cipher.init(javax.crypto.Cipher.ENCRYPT_MODE, key);
byte[] raw = IOUtil.toByteArray(inputStream);
byte[] encryptedData = cipher.doFinal(raw);
byte[] base64Encoded = Base64.encodeBase64(encryptedData);
outputStream.write(base64Encoded);
} catch (InvalidKeyException e) {
e.printStackTrace();
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
} catch (NoSuchPaddingException e) {
e.printStackTrace();
} catch (IllegalBlockSizeException e) {
e.printStackTrace();
} catch (BadPaddingException e) {
e.printStackTrace();
} finally {
inputStream.close();
outputStream.close();
}
}
}
LOG
# this is log from encryption
raw:
[97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122]
encrypted:
[92, -104, -48, -10, 95, -3, -21, 46, 27, -60, -115, 85, 114, -95, -126, 108, 88, -105, 94, -84, 86, 86, -75, -83, -73, 24, -109, 86, -34, 83, -35, 106]
base64Encoded:
[88, 74, 106, 81, 57, 108, 47, 57, 54, 121, 52, 98, 120, 73, 49, 86, 99, 113, 71, 67, 98, 70, 105, 88, 88, 113, 120, 87, 86, 114, 87, 116, 116, 120, 105, 84, 86, 116, 53, 84, 51, 87, 111, 61]
# this is from decryption
raw (this is the base64Encoded):
[88, 74, 106, 81, 57, 108, 47, 57, 54, 121, 52, 98, 120, 73, 49, 86, 99, 113, 71, 67, 98, 70, 105, 88, 88, 113, 120, 87, 86, 114, 87, 116, 116, 120, 105, 84, 86, 116, 53, 84, 51, 87, 111, 61]
base64Decoded (this is the encrypted):
[92, -104, -48, -10, 95, -3, -21, 46, 27, -60, -115, 85, 114, -95, -126, 108, 88, -105, 94, -84, 86, 86, -75, -83, -73, 24, -109, 86, -34, 83, -35, 106]
decrypted (this should be the raw from the encryption):
I don't know - the exception is thrown
好吧,您的加密代碼開始時似乎有點不穩定:
byte[] raw = IOUtil.toByteArray(inputStream);
byte[] encryptedData = cipher.doFinal();
如何給cipher
提供要cipher
的數據? 我懷疑您打算將raw
傳遞給doFinal
調用。
我懷疑那是個完整的問題,但這至少是一個起點。
后代編輯:從評論來看,問題在於使用不同的實例進行加密和解密,因此使用了不同的密鑰。
BadPaddingException解密加密流時主要是由於將加密數據保存為錯誤格式
有關詳細信息,請查看
http://themasterofmagik.wordpress.com/2014/03/19/simple-aes-encryption-and-decryption-in-java-part1/
它提到了哪個代碼給出了錯誤以及如何解決。
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