Java tutorial
//package com.java2s; import java.security.SecureRandom; import javax.crypto.KeyGenerator; import javax.crypto.SecretKey; public class Main { private static byte[] getRawKey(byte[] seed) throws Exception { KeyGenerator kgen = KeyGenerator.getInstance("AES"); SecureRandom sr = SecureRandom.getInstance("SHA1PRNG", "Crypto"); sr.setSeed(seed); kgen.init(256, sr); // 192 and 256 bits may not be available SecretKey skey = kgen.generateKey(); byte[] raw = skey.getEncoded(); return raw; } }