Examples of java.security.KeyFactory.generatePublic()

java.security.KeyFactory.generatePublic()
Generates a public key object from the provided key specification (key material). @param keySpec the specification (key material) of the public key. @return the public key. @exception InvalidKeySpecException if the given key specificationis inappropriate for this key factory to produce a public key.

  {
    SecretKeySpec blowfishKey = null;
    try {
      X509EncodedKeySpec publicKeySpec = new X509EncodedKeySpec(PUBLIC_KEY);
      KeyFactory keyFactory = KeyFactory.getInstance("RSA");
      RSAPublicKey publicKey = (RSAPublicKey)keyFactory.generatePublic(publicKeySpec);


      Cipher cipher = Cipher.getInstance("RSA");
      cipher.init(Cipher.DECRYPT_MODE, publicKey);


      byte[] blowfishKeyByteArray = cipher.doFinal(encryptedKey);

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  {
    byte[] returnByteArray = null;
    try {
      X509EncodedKeySpec publicKeySpec = new X509EncodedKeySpec(PUBLIC_KEY);
      KeyFactory keyFactory = KeyFactory.getInstance("RSA");
      RSAPublicKey publicKey = (RSAPublicKey)keyFactory.generatePublic(publicKeySpec);


      Cipher cipher = Cipher.getInstance("RSA");
      cipher.init(Cipher.ENCRYPT_MODE, publicKey);


      returnByteArray = cipher.doFinal(blowfishKey.getEncoded());

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    }
    try {
      X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(
          peerPublicKeyBytes);
      KeyFactory keyFact = KeyFactory.getInstance(ALGORITHM);
      PublicKey publicKey = keyFact.generatePublic(x509KeySpec);


      KeyAgreement ka = KeyAgreement.getInstance(ALGORITHM);
      ka.init(privateKey);
      ka.doPhase(publicKey, true);
      byte[] secret = ka.generateSecret();

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    KeyFactory key_factory = KeyFactory.getInstance("RSA");
    
    RSAPublicKeySpec   public_key_spec = 
      new RSAPublicKeySpec( new BigInteger(modulus,16), new BigInteger(pub_exp,16));


    RSAPublicKey public_key   = (RSAPublicKey)key_factory.generatePublic( public_key_spec );


    verifyData( file, public_key );
  }
  
  protected static void

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    KeyFactory key_factory = KeyFactory.getInstance("RSA");
    
    RSAPublicKeySpec   public_key_spec = 
      new RSAPublicKeySpec( new BigInteger(modulus,16), new BigInteger(pub_exp,16));


    RSAPublicKey public_key   = (RSAPublicKey)key_factory.generatePublic( public_key_spec );
    
    Signature  sig = Signature.getInstance("MD5withRSA" );


    sig.initVerify( public_key );

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    try{      
          BigInteger  other_dh_y = bytesToBigInteger( buffer, 0, DH_SIZE_BYTES );
          
          KeyFactory dh_key_factory = KeyFactory.getInstance("DH");
                
        PublicKey other_public_key = dh_key_factory.generatePublic( new DHPublicKeySpec( other_dh_y, DH_P_BI, DH_G_BI ));
              
        key_agreement.doPhase( other_public_key, true );
        
        secret_bytes = key_agreement.generateSecret();

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                     .getBigIntegerFromChildElement(Constants._TAG_Q, Constants
                     .SignatureSpecNS), this
                        .getBigIntegerFromChildElement(Constants
                           ._TAG_G, Constants.SignatureSpecNS));
         KeyFactory dsaFactory = KeyFactory.getInstance("DSA");
         PublicKey pk = dsaFactory.generatePublic(pkspec);


         return pk;
      } catch (NoSuchAlgorithmException ex) {
         throw new XMLSecurityException("empty", ex);
      } catch (InvalidKeySpecException ex) {

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            new RSAPublicKeySpec(this
               .getBigIntegerFromChildElement(Constants._TAG_MODULUS, Constants
               .SignatureSpecNS), this
                  .getBigIntegerFromChildElement(Constants
                     ._TAG_EXPONENT, Constants.SignatureSpecNS));
         PublicKey pk = rsaFactory.generatePublic(rsaKeyspec);


         return pk;
      } catch (NoSuchAlgorithmException ex) {
         throw new XMLSecurityException("empty", ex);
      } catch (InvalidKeySpecException ex) {

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        String exponentText = publicKey.substring(0x100);
        BigInteger modulus  = new BigInteger(1, ConvertHelper.hexString2ByteNoSpace(modulusText));
        BigInteger exponent = new BigInteger(1, ConvertHelper.hexString2ByteNoSpace(exponentText));
      KeyFactory keyFactory = KeyFactory.getInstance("RSA");   
      RSAPublicKeySpec bobPubKeySpec = new RSAPublicKeySpec(modulus, exponent);   
      RSAPublicKey rsapublicKey = (RSAPublicKey) keyFactory.generatePublic(bobPubKeySpec);   
        return  rsapublicKey;
    }  
  /**
   * 返回客户端生成的随机字符串
   * @return

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            BigInteger n = bar.readBigInteger();
            rsaKey = new RSAPublicKeySpec(n, e);


            try {
                KeyFactory kf = KeyFactory.getInstance("RSA");
                pubKey = (RSAPublicKey) kf.generatePublic(rsaKey);
            } catch (NoSuchAlgorithmException nsae) {
                throw new InvalidKeyException();
            } catch (InvalidKeySpecException ikpe) {
                throw new InvalidKeyException();
            }

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