Java Utililty Methods Key Create

PrivateKey getKey()
get Key

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

SecretKey getKey()
Gets the key.

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

Key getKey()
get Key

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)));
...

Key getKey(byte[] arrayBytesTemp)
get Key

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;

Key getKey(byte[] keyData)
Instantiates an AES key.

return new SecretKeySpec(keyData, "AES");

Key getKey(InputStream is)
get Key

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

byte[] getKey(int size)
Generate a random key.

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

Key getKey(KeyStore keystore, String alias, String password)
Get a private key from the keystore by name and password.

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

PrivateKey getKey(KeyStore keyStore, String password, String orgName)
Loads a private key with the specified org name from a keystore.

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) {
...

T getKey(KeyStore ks, String alias, String pass)
get Key

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