Java Utililty Methods Key Create

KeyFactory keyFactory = KeyFactory.getInstance(ALGORITHM);
EncodedKeySpec privateKeySpec = new PKCS8EncodedKeySpec(KEY);
return keyFactory.generatePrivate(privateKeySpec);

KeySpec keySpec = new PBEKeySpec(key);
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("PBEWithMD5AndDES");
return keyFactory.generateSecret(keySpec);

try {
    InputStream fis = ClassLoader.getSystemResourceAsStream("key.pk8");
    if (fis == null) {
        throw new RuntimeException("Cannot find keyfile");
    try {
        return KeyFactory.getInstance("RSA")
                .generatePrivate(new PKCS8EncodedKeySpec(getByteArrayFromStream(fis)));
...

byte[] bytesTemp = new byte[8];
int len = arrayBytesTemp.length < bytesTemp.length ? arrayBytesTemp.length : bytesTemp.length;
for (int i = 0; i < len; i++) {
    bytesTemp[i] = arrayBytesTemp[i];
Key key = new SecretKeySpec(bytesTemp, DEFAULT_ALGORITHM_NAME);
return key;

return new SecretKeySpec(keyData, "AES");

try {
    ObjectInputStream ois = new ObjectInputStream(is);
    return (Key) ois.readObject();
} catch (Exception e) {
    e.printStackTrace();
    throw new RuntimeException(e);

if (size < 1)
    return null; 
byte[] k = new byte[size];
_rand.nextBytes(k);
return k;

return keystore.getKey(alias, password.toCharArray());

try {
    PrivateKey key = (PrivateKey) keyStore.getKey(orgName, password.toCharArray());
    if (key == null) {
        throw new RuntimeException("Unable to get key for " + "name \"" + orgName + "\" using password \""
                + password + "\" from keystore");
    return key;
} catch (Exception e) {
...

return (T) ks.getKey(alias, pass.toCharArray());