Examples of javax.crypto.SecretKey

javax.crypto.SecretKey
A cryptographic secret (symmetric) key.
This interface is a marker interface to group secret keys and to provide type safety for.
Implementations of this interface have to overwrite the {@link Object#equals(Object) equals} and {@link Object#hashCode() hashCode}from {@link java.lang.Object} so comparison is done using the actual key dataand not the object reference.

   */
  public static byte[] createAESKey() {
    try {
          KeyGenerator kgen = KeyGenerator.getInstance("AES");
          kgen.init(0x100);
          SecretKey skey = kgen.generateKey();
          return skey.getEncoded();
        } catch (NoSuchAlgorithmException e) {
           throw new IllegalArgumentException("Cannot find key generator: AES", e);
        }
  }

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   * Encrypts griven string with given pass-phrase with DES.
   */
  public static String cipher(String msg, byte[] passPhrase) {
    try {
      KeySpec keySpec = new DESKeySpec(passPhrase);
      SecretKey key = SecretKeyFactory.getInstance("DES").generateSecret(
          keySpec);
      Cipher cipher = Cipher.getInstance(key.getAlgorithm());
      cipher.init(Cipher.ENCRYPT_MODE, key);
      return toHexString(cipher.doFinal(msg.getBytes()));
    } catch (Exception e) {
      return null;
    }

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   * Decrypts griven string with given pass-phrase with DES.
   */
  public static String decipher(String msg, byte[] passPhrase) {
    try {
      KeySpec keySpec = new DESKeySpec(passPhrase);
      SecretKey key = SecretKeyFactory.getInstance("DES").generateSecret(
          keySpec);
      Cipher cipher = Cipher.getInstance(key.getAlgorithm());
      cipher.init(Cipher.DECRYPT_MODE, key);
      return new String(cipher.doFinal(fromHexString(msg)));
    } catch (Exception e) {
      return null;
    }

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      System.out.println("Decrypted: "+theMsg);


      // Try a key that should fail
      KeyGenerator kgen = KeyGenerator.getInstance("Blowfish");
      kgen.init(320);
      SecretKey key = kgen.generateKey();
      cipher.init(Cipher.DECRYPT_MODE, key);
      try
      {
         String tmp = (String) msg.getObject(cipher);
         throw new IllegalArgumentException("Should have failed to decrypt the msg");

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   static void testKey() throws Exception
   {
      int size = 8 * 24;
      KeyGenerator kgen = KeyGenerator.getInstance("Blowfish");
      kgen.init(size);
      SecretKey key = kgen.generateKey();
      byte[] kbytes = key.getEncoded();
      System.out.println("key.Algorithm = "+key.getAlgorithm());
      System.out.println("key.Format = "+key.getFormat());
      System.out.println("key.Encoded Size = "+kbytes.length);
      
      SecureRandom rnd = SecureRandom.getInstance("SHA1PRNG");
      BigInteger bi = new BigInteger(320, rnd);
      byte[] k2bytes = bi.toByteArray();
      SecretKeySpec keySpec = new SecretKeySpec(k2bytes, "Blowfish");
      System.out.println("key2.Algorithm = "+key.getAlgorithm());
      System.out.println("key2.Format = "+key.getFormat());
      System.out.println("key2.Encoded Size = "+kbytes.length);
   }

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        }
      }
      key = (new DESedeKeySpec(desedekey)).getKey();
    }


    SecretKey secretKey = new SecretKeySpec(key,algorithm);


    /* DES in ECB mode does not require any parameters */
    if (mode.equals("ECB")) {
      _cipher.init(opmode, secretKey);

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      if (salt.length() > 8) salt = salt.substring(0,8);
      if (salt.length() < 8) salt = (salt + "XXXXXXXX").substring(0,8);
      
      // create the PBE key
      final SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(method);
      final SecretKey key = keyFactory.generateSecret(keySpec);


      // create parameter spec for PBE
      final PBEParameterSpec paramSpec = new PBEParameterSpec(UTF8.getBytes(salt), 1000 /*ITERATIONS*/);
        
      // Create a cipher and initialize it for encrypting end decrypting

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        try {
            KeyGenerator generator = provider == null
                                     ? KeyGenerator.getInstance(cipherName)
                                     : KeyGenerator.getInstance(cipherName,
                                         provider);
            SecretKey key = generator.generateKey();
            byte[]    raw = key.getEncoded();


            return raw;
        } catch (java.security.NoSuchAlgorithmException e) {
            throw Error.error(ErrorCode.X_S0531, e);
        } catch (NoSuchProviderException e) {

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            //Cipher encrypt = Cipher.getInstance("DES");            
            //SecretKey key = new SecretKeySpec(pass.getBytes(), "DES");
            
            Cipher encrypt = Cipher.getInstance("DESede/ECB/NoPadding", "BC");


            SecretKey key = new SecretKeySpec(pass.getBytes(), "DESede");


            encrypt.init(Cipher.ENCRYPT_MODE, key);


            // encode string mit utf8            
            byte[] utf8 = str.getBytes(SOSCrypt.charset);

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            //Cipher decrypt = Cipher.getInstance("DES");
            //SecretKey key = new SecretKeySpec(pass.getBytes(), "DES");
            Cipher decrypt = Cipher.getInstance("DESede/ECB/NoPadding", "BC");


            SecretKey key = new SecretKeySpec(pass.getBytes(), "DESede");


            decrypt.init(Cipher.DECRYPT_MODE, key);




            // decode base64 zu bytes

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