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POBadPaddingException when decrypting encrypted stream
 

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  1. POBadPaddingException when decrypting encrypted stream
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    <p>I'm using <code>javax.crypto.Cipher</code> to encrypt a file and then decrypt it but I'm still getting the BadPaddingException. The following class receives <code>inputStream</code> from the input file and <code>outputStream</code> for the output file.</p> <p><code>Error</code></p> <pre><code>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></pre> <p><code>Code</code> </p> <pre><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(); } } } </code></pre> <p><code>LOG</code></p> <pre><code># 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 </code></pre>
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    1. USuser219882
    1. USuser219882
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    1. COAdd a main method which reproduces this problem, to allow us testing it.
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      1. POBadPaddingException when decrypting encrypted stream
      1. USPaŭlo Ebermann
 

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