Examples of java.security.KeyPairGenerator.initialize()

java.security.KeyPairGenerator.initialize()
Initializes the key pair generator for a certain keysize using a default parameter set and the SecureRandom implementation of the highest-priority installed provider as the source of randomness. (If none of the installed providers supply an implementation of SecureRandom, a system-provided source of randomness is used.) @param keysize the keysize. This is analgorithm-specific metric, such as modulus length, specified in number of bits. @exception InvalidParameterException if the keysize is notsupported by this KeyPairGenerator object.

        if (side) {
            AlgorithmParameterGenerator paramGen = AlgorithmParameterGenerator.getInstance("DH");
            paramGen.init(512);


            KeyPairGenerator dh = KeyPairGenerator.getInstance("DH");
            dh.initialize(paramGen.generateParameters().getParameterSpec(DHParameterSpec.class));
            keyPair = dh.generateKeyPair();


            // send a half and get a half
            writeKey(keyPair.getPublic());
            otherHalf = KeyFactory.getInstance("DH").generatePublic(readKey());

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            otherHalf = KeyFactory.getInstance("DH").generatePublic(readKey());
        } else {
            otherHalf = KeyFactory.getInstance("DH").generatePublic(readKey());


            KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance("DH");
            keyPairGen.initialize(((DHPublicKey) otherHalf).getParams());
            keyPair = keyPairGen.generateKeyPair();


            // send a half and get a half
            writeKey(keyPair.getPublic());
        }

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        try {
            keyGen = KeyPairGenerator.getInstance(algorithm);
        } catch (NoSuchAlgorithmException e) {
            throw new RuntimeException(e);
        }
        keyGen.initialize(keylength, new SecureRandom());
        return keyGen.generateKeyPair();
    }


    public static KeyStore loadKeystore() throws Exception {
        KeyStore keystore = KeyStore.getInstance(KeyStore.getDefaultType());

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        try {
            keyGen = KeyPairGenerator.getInstance(algorithm);
        } catch (NoSuchAlgorithmException e) {
            throw new RuntimeException(e);
        }
        keyGen.initialize(keylength, new SecureRandom());
        return keyGen.generateKeyPair();
    }


    public static KeyStore loadKeystore() throws Exception {
        KeyStore keystore = KeyStore.getInstance(KeyStore.getDefaultType());

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        try {
            keyGen = KeyPairGenerator.getInstance(algorithm);
        } catch (NoSuchAlgorithmException e) {
            throw new RuntimeException(e);
        }
        keyGen.initialize(keylength, new SecureRandom());
        return keyGen.generateKeyPair();
    }


    public static KeyStore loadKeystore() throws Exception {
        KeyStore keystore = KeyStore.getInstance(KeyStore.getDefaultType());

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    try {
      generator = KeyPairGenerator.getInstance(algorithm);
    } catch (NoSuchAlgorithmException e) {
      throw new IllegalStateException("Error loading crypto provider", e);
    }
    generator.initialize(keysize);
    KeyPair keyPair = generator.generateKeyPair();
    return keyPair;


  }

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      generator = KeyPairGenerator.getInstance(algorithm);
    } catch (NoSuchAlgorithmException e) {
      throw new OpsException("Error building keypair generator: " + algorithm, e);
    }
    if (keySize != null) {
      generator.initialize(keySize);
    }
    return generator.generateKeyPair();
  }


}

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        if(type.equals(KeyPairType.DSA)){
            throw new UnsupportedTypeException(type);
        }
        try {
            KeyPairGenerator kg = KeyPairGenerator.getInstance(type.alg);
            kg.initialize(type.spec);
            return kg.generateKeyPair();
        } catch (NoSuchAlgorithmException e) {
            throw new Error(e); // Impossible?
        } catch (InvalidAlgorithmParameterException e) {
            throw new Error(e); // Impossible?

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    {
        DHParameterSpec             dhParams = new DHParameterSpec(p, g, privateValueSize);


        KeyPairGenerator keyGen = KeyPairGenerator.getInstance(algName, "BC");


        keyGen.initialize(dhParams);


        testTwoParty(algName, size, privateValueSize, keyGen);


        KeyPair aKeyPair = keyGen.generateKeyPair();

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        //
        // three party test
        //
        KeyPairGenerator aPairGen = KeyPairGenerator.getInstance(algName, "BC");
        aPairGen.initialize(spec);
        KeyPair aPair = aPairGen.generateKeyPair();


        KeyPairGenerator bPairGen = KeyPairGenerator.getInstance(algName, "BC");
        bPairGen.initialize(spec);
        KeyPair bPair = bPairGen.generateKeyPair();

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