Databases
StackOverflow2013
Postsdbo
POCipherInputStream only read 16 bytes (AES/Java)
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POCipherInputStream only read 16 bytes (AES/Java)
    primarykey
    data
    text
    <p>I'm using CipherInputStream and CipherOutputStream to encrypt files using AES.</p> <p><code>encrypt(...)</code> seems to be working fine, but my <code>decrypt(...)</code> function only decrypt the first 16 bytes of my files.</p> <p>Here is my class :</p> <pre><code>public class AESFiles { private byte[] getKeyBytes(final byte[] key) throws Exception { byte[] keyBytes = new byte[16]; System.arraycopy(key, 0, keyBytes, 0, Math.min(key.length, keyBytes.length)); return keyBytes; } public Cipher getCipherEncrypt(final byte[] key) throws Exception { byte[] keyBytes = getKeyBytes(key); Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding"); SecretKeySpec secretKeySpec = new SecretKeySpec(keyBytes, "AES"); IvParameterSpec ivParameterSpec = new IvParameterSpec(keyBytes); cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec, ivParameterSpec); return cipher; } public Cipher getCipherDecrypt(byte[] key) throws Exception { byte[] keyBytes = getKeyBytes(key); Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding"); SecretKeySpec secretKeySpec = new SecretKeySpec(keyBytes, "AES"); IvParameterSpec ivParameterSpec = new IvParameterSpec(keyBytes); cipher.init(Cipher.DECRYPT_MODE, secretKeySpec, ivParameterSpec); return cipher; } public void encrypt(File inputFile, File outputFile, byte[] key) throws Exception { Cipher cipher = getCipherEncrypt(key); FileOutputStream fos = null; CipherOutputStream cos = null; FileInputStream fis = null; try { fis = new FileInputStream(inputFile); fos = new FileOutputStream(outputFile); cos = new CipherOutputStream(fos, cipher); byte[] data = new byte[1024]; int read = fis.read(data); while (read != -1) { cos.write(data, 0, read); read = fis.read(data); System.out.println(new String(data, "UTF-8").trim()); } cos.flush(); } finally { fos.close(); cos.close(); fis.close(); } } public void decrypt(File inputFile, File outputFile, byte[] key) throws Exception { Cipher cipher = getCipherDecrypt(key); FileOutputStream fos = null; CipherInputStream cis = null; FileInputStream fis = null; try { fis = new FileInputStream(inputFile); cis = new CipherInputStream(fis, cipher); fos = new FileOutputStream(outputFile); byte[] data = new byte[1024]; int read = cis.read(data); while (read != -1) { fos.write(data, 0, read); read = cis.read(data); System.out.println(new String(data, "UTF-8").trim()); } } finally { fos.close(); cis.close(); fis.close(); } } public static void main(String args[]) throws Exception { byte[] key = "mykey".getBytes("UTF-8"); new AESFiles().encrypt(new File("C:\\Tests\\secure.txt"), new File("C:\\Tests\\secure.txt.aes"), key); new AESFiles().decrypt(new File("C:\\Tests\\secure.txt.aes"), new File("C:\\Tests\\secure.txt.1"), key); } } </code></pre> <p>So my question is, why the <code>decrypt</code> function only read the first 16 bytes ?</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USGray
    1. USJoshua
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POCipherInputStream only read 16 bytes (AES/Java)
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. POCipherInputStream only read 16 bytes (AES/Java)
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. POCipherInputStream only read 16 bytes (AES/Java)
      1. USizilotti
      1. VTFavorite
    1. COHow do you know it decrypts only 16 bytes? Can you edit your post to show the exception you are getting?
      singulars
      1. POCipherInputStream only read 16 bytes (AES/Java)
      1. USGray
    2. COI'm not getting any exception. The size of the file "secure.txt.1" (decrypted files) has only 16 bytes, while the source has 41 bytes.
      singulars
      1. POCipherInputStream only read 16 bytes (AES/Java)
      1. USJoshua
    3. CONote that using `CipherInputStream` is very tricky as it sweeps exceptions under the carpet (that's a proverb meaning that it hides them). I would not use it myself.
      singulars
      1. POCipherInputStream only read 16 bytes (AES/Java)
      1. USMaarten Bodewes
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload