Examples of java.security.spec.KeySpec

java.security.spec.KeySpec
A (transparent) specification of the key material that constitutes a cryptographic key.
If the key is stored on a hardware device, its specification may contain information that helps identify the key on the device.
A key may be specified in an algorithm-specific way, or in an algorithm-independent encoding format (such as ASN.1). For example, a DSA private key may be specified by its components x, p, q, and g (see {@link DSAPrivateKeySpec}), or it may be specified using its DER encoding (see {@link PKCS8EncodedKeySpec}).
This interface contains no methods or constants. Its only purpose is to group (and provide type safety for) all key specifications. All key specifications must implement this interface. @author Jan Luehe @version 1.18, 11/17/05 @see java.security.Key @see java.security.KeyFactory @see EncodedKeySpec @see X509EncodedKeySpec @see PKCS8EncodedKeySpec @see DSAPrivateKeySpec @see DSAPublicKeySpec @since 1.2

     
       throws CryptoManagerException
     {
       BigInteger D = new BigInteger(input);
       
       KeySpec keyspec = new ECPrivateKeySpec(D,(ECParameterSpec)ECCparam);
       
       PrivateKey privkey = null;
       
       try{
         privkey = KeyFactory.getInstance("ECDSA","BC").generatePrivate(keyspec);

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       throws CryptoManagerException
     {
       ECPoint W = ECCparam.getCurve().decodePoint(input);
       
       KeySpec keyspec = new ECPublicKeySpec(W,(ECParameterSpec)ECCparam);


       try{
         
         return KeyFactory.getInstance("ECDSA", "BC").generatePublic(keyspec);

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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()));

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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)));

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                }


                keyblob = bar.readBinaryString();


                Cipher cipher = Cipher.getInstance("DESede/CBC/PKCS5Padding");
                KeySpec keyspec = new DESedeKeySpec(keydata);
                Key key = SecretKeyFactory.getInstance("DESede").generateSecret(keyspec);
                cipher.init(Cipher.DECRYPT_MODE, key,
                    new IvParameterSpec(iv, 0, cipher.getBlockSize()));


                ByteArrayReader data = new ByteArrayReader(cipher.doFinal(

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                    byte[] iv = new byte[8];
                    Utils.getRND().nextBytes(iv);


                    Cipher cipher = Cipher.getInstance(
                            "DESede/CBC/PKCS5Padding");
                    KeySpec keyspec = new DESedeKeySpec(keydata);
                    Key key = SecretKeyFactory.getInstance("DESede")
                                              .generateSecret(keyspec);
                    cipher.init(Cipher.ENCRYPT_MODE, key,
                        new IvParameterSpec(iv, 0, cipher.getBlockSize()));

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   */
  protected static byte[] getSharedSecret(byte[] otherPublicKeyBytes, KeyAgreement agreement) {
    BigInteger otherPublicKeyInt = new BigInteger(1, otherPublicKeyBytes);
    try {
      KeyFactory keyFactory = KeyFactory.getInstance("DH");
      KeySpec otherPublicKeySpec = new DHPublicKeySpec(otherPublicKeyInt, RTMPHandshake.DH_MODULUS, RTMPHandshake.DH_BASE);
      PublicKey otherPublicKey = keyFactory.generatePublic(otherPublicKeySpec);
      agreement.doPhase(otherPublicKey, true);
    } catch (Exception e) {
      JFLog.log("Exception getting the shared secret", e);
    }

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    }    
    
    private static PublicKey getPublicKey(String algo) 
            throws InvalidKeySpecException, NoSuchAlgorithmException {
        KeyFactory kf = KeyFactory.getInstance(algo);
        KeySpec kspec = null;
        if (algo.equalsIgnoreCase("DSA")) {
            kspec = new DSAPublicKeySpec(new BigInteger(DSA_Y), 
                        new BigInteger(DSA_P), 
                        new BigInteger(DSA_Q), 
                        new BigInteger(DSA_G));

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     */
    private Key getCiperKey(byte[] salt) throws UnsupportedEncodingException, NoSuchAlgorithmException, InvalidKeySpecException {
        SecretKeyFactory factory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA1");
        // hashing the password 65K times takes 151ms, hashing 256 times takes 2ms.
        // Since the salt has 2^^72 values, 256 times is probably good enough.
        KeySpec spec = new PBEKeySpec(sharedKey.toCharArray(), salt, 256, 128);
        SecretKey tmp = factory.generateSecret(spec);
        SecretKey key = new SecretKeySpec(tmp.getEncoded(), "AES");
        return key;
    }

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     * @return the generated key.
     */
    private SecretKey generateAESKey(String privateKey, String salt) {
        try {
            byte[] raw = Hex.decodeHex(salt.toCharArray());
            KeySpec spec = new PBEKeySpec(privateKey.toCharArray(), raw, iterationCount, keySize);
            SecretKeyFactory factory = SecretKeyFactory.getInstance(PBKDF_2_WITH_HMAC_SHA_1);
            return new SecretKeySpec(factory.generateSecret(spec).getEncoded(), AES_ECB_ALGORITHM);
        } catch (DecoderException e) {
            throw new IllegalStateException(e);
        } catch ( NoSuchAlgorithmException e) {

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