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.

        }
        
        DSAParameterSpec dsaP = (DSAParameterSpec)params.getParameterSpec(DSAParameterSpec.class);
        
        KeyPairGenerator    g = KeyPairGenerator.getInstance("DSA", "BC");
        g.initialize(dsaP, new SecureRandom());
        KeyPair p = g.generateKeyPair();
        
        PrivateKey  sKey = p.getPrivate();
        PublicKey   vKey = p.getPublic();

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        {
            fail("G incorrect");
        }


        KeyPairGenerator    g = KeyPairGenerator.getInstance("DSA", "BC");
        g.initialize(dsaP, new FixedSecureRandom(Hex.decode("0CAF2EF547EC49C4F3A6FE6DF4223A174D01F2C115D49A6F73437C29A2A8458C")));
        KeyPair p = g.generateKeyPair();


        DSAPrivateKey  sKey = (DSAPrivateKey)p.getPrivate();
        DSAPublicKey   vKey = (DSAPublicKey)p.getPublic();

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      // generate the public and private RSA key pair using the
      // BouncyCastle provider with a KEY_SIZE bit key size for
      // the digital signature
      final KeyPairGenerator keyPairGenerator = KeyPairGenerator
          .getInstance("RSA");
      keyPairGenerator.initialize(KEY_SIZE, new SecureRandom());
      KeyPair kp = keyPairGenerator.generateKeyPair();


      // final PKCS12BagAttributeCarrier bagAttr
      // =(PKCS12BagAttributeCarrier) kp.getPrivate();
      // bagAttr.setBagAttribute(PKCSObjectIdentifiers.pkcs_9_at_localKeyId,

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    private KeyPair generateKeyPair(String algorithm) {
        try {
            KeyPairGenerator generator = SecurityUtils.getKeyPairGenerator(algorithm);
            if (keySize != 0) {
                generator.initialize(keySize);
            }
            log.info("Generating host key...");
            KeyPair kp = generator.generateKeyPair();
            return kp;
        } catch (Exception e) {

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        DHParameterSpec dhParamSpec = publicKey.getParams();
        //Debug.logInfo(dhParamSpec.getP().toString() + " / " + dhParamSpec.getG().toString(), module);


        // create the public/private key pair using parameters defined by valuelink
        KeyPairGenerator keyGen = KeyPairGenerator.getInstance("DH");
        keyGen.initialize(dhParamSpec);
        KeyPair keyPair = keyGen.generateKeyPair();


        return keyPair;
    }

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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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    }


    public boolean generateKeyPair(String alias, char[] storePassword, char[] keyPassword, String keyAlgorithm, int keySize, String signatureAlgorithm, int validity, String commonName, String orgUnit, String organization, String locality, String state, String country) {
        try {
            KeyPairGenerator kpgen = KeyPairGenerator.getInstance(keyAlgorithm);
            kpgen.initialize(keySize);
            KeyPair keyPair = kpgen.generateKeyPair();
            X509Certificate cert = generateCertificate(keyPair.getPublic(), keyPair.getPrivate(), signatureAlgorithm,
                    validity, commonName, orgUnit, organization, locality, state, country);


            keystore.setKeyEntry(alias, keyPair.getPrivate(), keyPassword, new Certificate[] { cert });

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  KeyPair kp = null;
  try {
      KeyPairGenerator generator =
        KeyPairGenerator.getInstance("RSA", "IAIK");
      generator.initialize(512);
      kp = generator.generateKeyPair();
  } catch (NoSuchAlgorithmException e) {
      System.out.println("Can't create RSA/512 key pair: " + e);
      System.exit(1);
  } catch (NoSuchProviderException e) {

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            java.security.InvalidKeyException,
            java.security.cert.CertificateException, java.io.IOException {


        KeyPairGenerator kpgen = KeyPairGenerator.getInstance(keyalg);


        kpgen.initialize(keysize.intValue());


        KeyPair keyPair = kpgen.generateKeyPair();


        X509Certificate cert = generateCert(keyPair.getPublic(), keyPair
                .getPrivate(), sigalg, validity.intValue(), cn, ou, o, l, st, c);

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            throw new NullPointerException("storePassword is null");
        }
        ensureLoaded(storePassword);
        try {
            KeyPairGenerator kpgen = KeyPairGenerator.getInstance(keyAlgorithm);
            kpgen.initialize(keySize);
            KeyPair keyPair = kpgen.generateKeyPair();
            X509Certificate cert = generateCertificate(keyPair.getPublic(), keyPair.getPrivate(), signatureAlgorithm,
                    validity, commonName, orgUnit, organization, locality, state, country);
    
            keystore.setKeyEntry(alias, keyPair.getPrivate(), keyPassword, new Certificate[] { cert });

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