Examples of java.security.KeyPair

java.security.KeyPair
This class is a simple holder for a key pair (a public key and a private key). It does not enforce any security, and, when initialized, should be treated like a PrivateKey. @see PublicKey @see PrivateKey @version 1.16 05/11/17 @author Benjamin Renaud


  public byte[] createPublicKey() throws CryptoException {
    try {
      KeyPairGenerator keyGen = KeyPairGenerator.getInstance(ALGORITHM);
      keyGen.initialize(DH_SPEC);
      KeyPair keypair = keyGen.generateKeyPair();


      privateKey = keypair.getPrivate();
      PublicKey publicKey = keypair.getPublic();


      return publicKey.getEncoded();
    } catch (NoSuchAlgorithmException e) {
      throw new CryptoException(e);
    } catch (InvalidAlgorithmParameterException e) {

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  {
    KeyPairGenerator  kg = KeyPairGenerator.getInstance( "RSA" );
    
    kg.initialize(strength, RandomUtils.SECURE_RANDOM );


    KeyPair pair = kg.generateKeyPair();
          
    X509V3CertificateGenerator certificateGenerator = 
      new X509V3CertificateGenerator();
    
    certificateGenerator.setSignatureAlgorithm( "MD5WithRSAEncryption" );
    
    certificateGenerator.setSerialNumber( new BigInteger( ""+SystemTime.getCurrentTime()));
          
    X509Name  issuer_dn = new X509Name(true,cert_dn);
    
    certificateGenerator.setIssuerDN(issuer_dn);
    
    X509Name  subject_dn = new X509Name(true,cert_dn);
    
    certificateGenerator.setSubjectDN(subject_dn);
    
    Calendar  not_after = Calendar.getInstance();
    
    not_after.add(Calendar.YEAR, 1);
    
    certificateGenerator.setNotAfter( not_after.getTime());
    
    certificateGenerator.setNotBefore(Calendar.getInstance().getTime());
    
    certificateGenerator.setPublicKey( pair.getPublic());
    
    X509Certificate certificate = certificateGenerator.generateX509Certificate(pair.getPrivate());
    
    java.security.cert.Certificate[] certChain = {(java.security.cert.Certificate) certificate };


    manager.addCertToKeyStore( alias, pair.getPrivate(), certChain );
    
    return( certificate );
  }

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            AsymmetricCipherKeyPair     pair = engine.generateKeyPair();
            ECPublicKeyParameters       pub = (ECPublicKeyParameters)pair.getPublic();
            ECPrivateKeyParameters      priv = (ECPrivateKeyParameters)pair.getPrivate();


            return new KeyPair(new JCEECPublicKey(algorithm, pub, ecParams),
                               new JCEECPrivateKey(algorithm, priv, ecParams));
        }

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  initCrypto()
  
    throws IOException
  {
    try{
          KeyPair key_pair = generateDHKeyPair( transport, outbound );
            
          key_agreement = KeyAgreement.getInstance("DH");
          
          key_agreement.init(key_pair.getPrivate());
         
          DHPublicKey  dh_public_key = (DHPublicKey)key_pair.getPublic();
          
          BigInteger  dh_y = dh_public_key.getY();
          
          dh_public_key_bytes = bigIntegerToBytes( dh_y, DH_SIZE_BYTES );

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        }
        
        last_dh_incoming_key_generate = now;
      }
      
      KeyPair  res = dh_key_generator.generateKeyPair();
      
      return( res );
    }
  }

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    try{
      synchronized( this ){
        
        if ( use_method_public_key == null || use_method_private_key == null ){
          
          KeyPair  keys = CryptoECCUtils.createKeys();
          
          use_method_public_key  = keys.getPublic();
          
          use_method_private_key  = keys.getPrivate();
          
          last_unlock_time = SystemTime.getCurrentTime();
          
          COConfigurationManager.setParameter( CONFIG_PREFIX + "publickey", CryptoECCUtils.keyToRawdata( use_method_public_key ));

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    add_time      = SystemTime.getCurrentTime();
    
    is_subscribed    = true;


    try{
      KeyPair  kp = CryptoECCUtils.createKeys();
        
      public_key       = CryptoECCUtils.keyToRawdata( kp.getPublic());
      private_key     = CryptoECCUtils.keyToRawdata( kp.getPrivate());
            
      
      fixed_random  = new Random().nextInt();
      
      init();

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      byte[]  encoded_subs = Base64.encode( bytes );
      
        // use a transient key-pair as we won't have the private key in general
      
      KeyPair  kp = CryptoECCUtils.createKeys();
      
      byte[] public_key     = CryptoECCUtils.keyToRawdata( kp.getPublic());
      byte[] private_key     = CryptoECCUtils.keyToRawdata( kp.getPrivate());
  
      PlatformSubscriptionsMessenger.updateSubscription(
          true,
          subs.getName(),
          public_key,

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    public void testGenerateKeyPairSha1Default()
    {
        DHParameterSpec parameterSpec = DiffieHellmanSession.getDefaultParameter();


        KeyPair keyPair = DiffieHellmanSession.generateKeyPair(parameterSpec);


        assertNotNull(keyPair);
    }

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    public void testGenerateKeyPairSha1Random()
    {
        DHParameterSpec parameterSpec = DiffieHellmanSession.generateRandomParameter(512, 256);


        KeyPair keyPair = DiffieHellmanSession.generateKeyPair(parameterSpec);


        assertNotNull(keyPair);
    }

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