Java的AES 256安全密鑰生成器 - 非法密鑰大小

我試圖生成加密的密鑰：Java的AES 256安全密鑰生成器 - 非法密鑰大小

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; 
}

這是結果：

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

我真的絕望了..請幫助我，謝謝！

來源

2011-07-03 Sir Galahad