Java AES 256 Secure Key Generator — Illegal key size

Question

I am trying to generate a key for encryption:

public static final String ENCYT_ALGORITHM = "AES/ECB/PKCS7Padding";
public static final String KEY_ALGORITHM = "PBEWITHSHA256AND256BITAES-CBC-BC" ;
//BENCYT_ALGORITHMSE64Encoder encod = new BENCYT_ALGORITHMSE64Encoder();
//BENCYT_ALGORITHMSE64Decoder decod = new BENCYT_ALGORITHMSE64Decoder();

public Encryption(String preMaster,String text,int x){      
    this.preMaster=preMaster;       
    this.text=text.getBytes();
}
public void keyGenerator(){
    KeyGenerator kg = null;
    try {
        kg = KeyGenerator.getInstance("AES");
        secret = kg.generateKey();
    } catch (Exception e) {
        // TODO ENCYT_ALGORITHMuto-generated catch block
        e.printStackTrace();
    }

}

public String preMaster() {

    byte[] keys = null;
    keys = preMaster.getBytes();
    int x = -1;
    int process = 0;
    while (x < keys.length - 2) {
        x++;
        switch (x) {
        case 1:
            process = keys[x + 1] | a ^ c & (d | keys[x] % a);
        case 2:
            process += a | (keys[x] ^ c) & d;
        case 3:
            process += keys[x] ^ (keys[x + 1] / a) % d ^ b;
        default:
            process += keys[x + 1] / (keys[x] ^ c | d);
        }
    }

    byte[] xs = new byte[] { (byte) (process >>> 24),
            (byte) (process >> 16 & 0xff), (byte) (process >> 8 & 0xff),
            (byte) (process & 0xff) };
    preMaster = new String(xs);
    KeyGenerators key = new KeyGenerators(preMaster);
    String toMaster = key.calculateSecurityHash("MD5")
            + key.calculateSecurityHash("MD2")
            + key.calculateSecurityHash("SHA-512");


    return toMaster;
}

public String keyWrapper(){
    Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider()); 
    Key SharedKey = secret;
    String key = null;
    char[] preMaster = this.preMaster().toCharArray();
    try {

        byte[]salt={ 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06}; 
        paramSpec = new PBEParameterSpec(salt,256);
        PBEKeySpec keySpec = new PBEKeySpec(preMaster,salt,1024,256);
        SecretKeyFactory factory = SecretKeyFactory.getInstance(KEY_ALGORITHM);
        passwordKey = factory.generateSecret(keySpec);
        Cipher c = Cipher.getInstance(KEY_ALGORITHM);
        c.init(Cipher.WRAP_MODE, passwordKey, paramSpec);
        byte[] wrappedKey = c.wrap(SharedKey);
        key=new String(wrappedKey,"UTF8");
    }catch(Exception e){
        e.printStackTrace();
    }
    return key;
}

And this is the result:

java.security.InvalidKeyException: Illegal key size
at javax.crypto.Cipher.a(DashoA13*..)
at javax.crypto.Cipher.a(DashoA13*..)
at javax.crypto.Cipher.a(DashoA13*..)
at javax.crypto.Cipher.init(DashoA13*..)
at javax.crypto.Cipher.init(DashoA13*..)
at fiador.authentication.util.Encryption.keyWrapper(Encryption.java:101)
at fiador.authentication.util.Encryption.main(Encryption.java:144)
null

I am really desperate... please help me, thanks !

Answer 1

You have not installed the unlimited strength crypto files, (the default JDK install allows 128 bit keys as documented in http://download.oracle.com/javase/6/docs/technotes/guides/security/crypto/CryptoSpec.html#AppC ).

Download unlimited strength crypto package here .

Installation Help

Answer 2

I can't see where keyGenerator is being called. If it is not called, then secret is not being initialized. That could be the cause of the root exception. (It is hard to tell, because you've left out the declaration of secret .)