getSecureRawKey

gistfile1.java

static byte[] getSecureRawKey(String seed) {
	/* 
	 * check http://www.motorola.com/sites/motodev/library/using_aes_in_android.html
	 * for detail information
	 */
	char[] humanPassphrase = seed.toCharArray();
	byte[] salt = {
			0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0xA, 0xB, 0xC, 0xD, 0xE, 0xF
	}; // must save this!
	final int HASH_ITERATIONS = 10000;
	final int KEY_LENGTH = 128;
	PBEKeySpec mykeyspec = new PBEKeySpec(humanPassphrase, salt, HASH_ITERATIONS, KEY_LENGTH);

	SecretKeyFactory keyfactory;
	try {
		keyfactory = SecretKeyFactory.getInstance("PBEWITHSHAANDTWOFISH-CBC");
		SecretKey sk = keyfactory.generateSecret(mykeyspec);
		byte[] skAsByteArray = sk.getEncoded();
		SecretKey skforAES = new SecretKeySpec(skAsByteArray, "AES");
		byte[] raw = skforAES.getEncoded();
		return raw;
	} catch (NoSuchAlgorithmException e) {
		e.printStackTrace();
	} catch (InvalidKeySpecException e) {
		e.printStackTrace();
	}

	return null;
}