Here you can find the source of encryptToBytes(String key, String src)
public static byte[] encryptToBytes(String key, String src) throws Exception
//package com.java2s; import java.security.SecureRandom; import javax.crypto.Cipher; import javax.crypto.KeyGenerator; import javax.crypto.SecretKey; import javax.crypto.spec.SecretKeySpec; public class Main { public static byte[] encryptToBytes(String key, String src) throws Exception { byte[] rawKey = getRawKey(key); return encrypt(rawKey, src.getBytes()); }/* ww w . java 2s.c o m*/ private static byte[] getRawKey(String key) throws Exception { KeyGenerator kgen = KeyGenerator.getInstance("AES"); SecureRandom sr = SecureRandom.getInstance("SHA1PRNG"); sr.setSeed(key.getBytes()); kgen.init(256, sr); SecretKey skey = kgen.generateKey(); return skey.getEncoded(); } private static byte[] encrypt(byte[] key, byte[] src) throws Exception { SecretKeySpec skeySpec = new SecretKeySpec(key, "AES"); Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding"); cipher.init(Cipher.ENCRYPT_MODE, skeySpec); return cipher.doFinal(src); } }