Kam një përjashtim në kodin e mëposhtëm për algoritmin AES në java.
Kodi deshifron një varg të koduar dhe kthen vargun origjinal.
Ju lutem më ndihmoni ta rregulloj këtë.
Kodi:
public class AES
{
public byte[] encrypted;
public byte[] original;
public String originalString;
public static String asHex (byte buf[])
{
StringBuffer strbuf = new StringBuffer(buf.length * 2);
int i; for (i = 0; i < buf.length; i++)
{
if (((int) buf[i] & 0xff) < 0x10) strbuf.append("0");
strbuf.append(Long.toString((int) buf[i] & 0xff, 16));
}
return strbuf.toString();
}
public String AESencryptalgo(byte[] text)
{
String newtext="";
// Get the KeyGenerator
try
{
KeyGenerator kgen = KeyGenerator.getInstance("AES");
kgen.init(128); // 192 and 256 bits may not be available
// Generate the secret key specs.
SecretKey skey = kgen.generateKey();
byte[] raw = skey.getEncoded();
SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
// Instantiate the cipher Cipher cipher = Cipher.getInstance("AES");
cipher.init(Cipher.ENCRYPT_MODE, skeySpec); encrypted = cipher.doFinal(text);
System.out.println("encrypted string: " + asHex(encrypted));
cipher.init(Cipher.DECRYPT_MODE, skeySpec); original = cipher.doFinal(encrypted);
originalString = new String(original); System.out.println("Original string: " + originalString + " " + asHex(original));
}
catch(Exception e)
{ }
finally
{
newtext=new String(encrypted);
System.out.println("ENCRYPTED "+newtext);
//AESdecryptalgo(newtext.getBytes());
return newtext;
}
}
public String AESdecryptalgo(byte[] text)
{
// Get the KeyGenerator
try
{
KeyGenerator kgen = KeyGenerator.getInstance("AES");
kgen.init(128); // 192 and 256 bits may not be available
// Generate the secret key specs.
SecretKey skey = kgen.generateKey();
byte[] raw = skey.getEncoded();
SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
// Instantiate the cipher
Cipher cipher = Cipher.getInstance("AES");
cipher.init(Cipher.DECRYPT_MODE, skeySpec);
original = cipher.doFinal(text); //Exception occurs here
originalString = new String(original);
System.out.println("Original string: " + originalString + " " + asHex(original));
}
catch(Exception e)
{
System.out.println("exception");
}
finally
{
System.out.println("DECRYPTED "+originalString);
return originalString;
}
}
public static void main(String[] args)
{
AES a=new AES();
a.AESencryptalgo("hello".getBytes());
System.out.println();
}}
`
përjashtim:
javax.crypto.BadPaddingException: Given final block not properly padded at
com.sun.crypto.provider.SunJCE_f.b(DashoA13*..) at
com.sun.crypto.provider.SunJCE_f.b(DashoA13*..) at
com.sun.crypto.provider.AESCipher.engineDoFinal(DashoA13*..) at
javax.crypto.Cipher.doFinal(DashoA13*..)
