Java Utililty Methods Key Pair Create

return generateKeyPair(DEFAULT_KEY_LENGTH);

try {
    KeyPairGenerator keyGen = KeyPairGenerator.getInstance(ASYM_ALGORITHM);
    SecureRandom random = SecureRandom.getInstance("SHA1PRNG");
    keyGen.initialize(512, random);
    return keyGen.generateKeyPair();
} catch (NoSuchAlgorithmException e) {
    throw new IllegalArgumentException("No such algorithm:" + e.getMessage());

KeyPairGenerator kpGen = KeyPairGenerator.getInstance("RSA", "BC");
kpGen.initialize(1024, new SecureRandom());
return kpGen.generateKeyPair();

try {
    KeyPairGenerator generator = KeyPairGenerator.getInstance("RSA");
    SecureRandom random = new SecureRandom();
    random.setSeed(System.currentTimeMillis());
    generator.initialize(1024, random);
    KeyPair keyPair = generator.generateKeyPair();
    RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();
    RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();
...

KeyPairGenerator keyPairGenerator = null;
try {
    keyPairGenerator = KeyPairGenerator.getInstance(ALGORITHM);
} catch (NoSuchAlgorithmException e) {
    e.printStackTrace();
keyPairGenerator.initialize(KEYSIZE);
KeyPair keyPair = keyPairGenerator.generateKeyPair();
...

KeyPairGenerator keyGen = KeyPairGenerator.getInstance("DSA", "SUN");
SecureRandom random = SecureRandom.getInstance("SHA1PRNG", "SUN");
keyGen.initialize(1024, random);
return keyGen.generateKeyPair();

final KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("EC");
final SecureRandom random = SecureRandom.getInstance("SHA1PRNG");
keyPairGenerator.initialize(256, random);
final KeyPair keyPair = keyPairGenerator.generateKeyPair();
return keyPair;

return generateKeyPair(DEFAULT_KEY_ALGORITHM, DEFAULT_KEY_SIZE);

try {
    KeyPairGenerator keyGen = KeyPairGenerator.getInstance("RSA");
    keyGen.initialize(2048);
    KeyPair kp = keyGen.genKeyPair();
    return kp;
} catch (Exception e) {
    throw new RuntimeException(e);

ECGenParameterSpec ecGenSpec = new ECGenParameterSpec("secp384r1");
KeyPairGenerator g;
try {
    g = KeyPairGenerator.getInstance("ECDSA", BC_PROVIDER_NAME);
} catch (NoSuchAlgorithmException | NoSuchProviderException e) {
    throw new RuntimeException(e.getMessage(), e);
try {
...