Name: iiR10263 Date: 11/13/2003



The specification requires Cipher objects to throw
IllegaltateException "if this cipher is in a wrong state (e.g., has
not been initialized)" when doFianal() or wrap() are called. For
example we can consider that a Cipher object that is initialized for
encryption is "in a wrong state" for wrapping.

So it is reasonable to throw IllegalStateException if a Cipher was
initialized for encryption but wrap() is called (or a Cipher was
initialized for wrapping but doFinal() or update() is called).

The implementation does not throw any exceptions in such situations.

Please find the code example that reproduces the problem below

import java.io.PrintWriter;
import java.security.InvalidKeyException;
import java.security.Key;
import java.security.AlgorithmParameters;
import java.security.spec.KeySpec;
import javax.crypto.Cipher;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.SecretKeySpec;

public class e7 {
 
    public static void main(String argv[]) {
        Key k;
        Cipher c;
        AlgorithmParameters params = null;
        
        String alg = "PBEWITHMD5ANDDES";
        byte[] salt = {
            (byte)0xc7, (byte)0x73, (byte)0x21, (byte)0x8c,
            (byte)0x7e, (byte)0xc8, (byte)0xee, (byte)0x99
        };
        int count = 20;
        String s = "My wonderfull password that is long enough. Tra-la-la, let me sing a song";
        
        try {
            int kl = Cipher.getMaxAllowedKeyLength(alg);
            
            SecretKeyFactory skf =
                SecretKeyFactory.getInstance(alg);

            KeySpec ks = new PBEKeySpec(s.toCharArray(), salt, count, kl);

            // PBE algorithm is symmetric.
            k = skf.generateSecret(ks);

            c = Cipher.getInstance(alg);

            c.init(Cipher.WRAP_MODE, k);
            
            try {
            
                c.doFinal();
                
                System.out.println("Where is my exception?");
            } catch (IllegalStateException e) {
            }

        } catch (Exception e) {
            e.printStackTrace(System.out);
        }
    }
}

Test output is
Where is my exception?

java full version "1.5.0-beta-b26"

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