JAVA,AES加密算法

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private static final String AES = "AES";    private static final String CHARSET_NAME = "utf-8";        private static SecretKeySpec getKey(String password)            throws NoSuchAlgorithmException {        // 密钥加密器生成器        KeyGenerator kgen = KeyGenerator.getInstance(AES);        SecureRandom random = SecureRandom.getInstance("SHA1PRNG");        random.setSeed(password.getBytes());        kgen.init(128, random);        // 创建加密器        SecretKey secretKey = kgen.generateKey();        byte[] enCodeFormat = secretKey.getEncoded();        SecretKeySpec key = new SecretKeySpec(enCodeFormat, AES);        return key;    }        public static String encode(String str, String password) {        byte[] arr = encodeToArr(str, password);        return byteArrToString(arr);    }        private static byte[] encodeToArr(String str, String password) {        try {            Cipher cipher = Cipher.getInstance(AES);// 创建密码器            byte[] byteContent = str.getBytes(CHARSET_NAME);            cipher.init(Cipher.ENCRYPT_MODE, getKey(password));// 初始化            byte[] result = cipher.doFinal(byteContent);            return result;        } catch (Exception e) {            e.printStackTrace();        }        return null;    }        public static String decode(String hexStr, String password) {        try {            byte[] arr = string2ByteArr(hexStr);            return decode(arr, password);        } catch (Exception e) {            e.printStackTrace();            return null;        }    }        private static String decode(byte[] arr, String password) {        try {            // 创建密码器            Cipher cipher = Cipher.getInstance(AES);            cipher.init(Cipher.DECRYPT_MODE, getKey(password));// 初始化            byte[] result = cipher.doFinal(arr);            return new String(result, CHARSET_NAME);        } catch (Exception e) {            e.printStackTrace();        }        return null;    }        private static String byteArrToString(byte[] arr) {        StringBuffer sb = new StringBuffer();        for (int i = 0; i < arr.length; i++) {            String s = Integer.toString(arr[i] + 128, 16);            if (s.length() == 1) {                s = "0" + s;            }            sb.append(s);        }        return sb.toString().toUpperCase();    }        private static byte[] string2ByteArr(String s) {        s = s.toUpperCase();        String str = "0123456789ABCDEF";        byte[] arr = new byte[s.length() / 2];        for (int i = 0; i < arr.length; i++) {            char s1 = s.charAt(i * 2);            char s2 = s.charAt(i * 2 + 1);            int tmp1 = str.indexOf(s1) * 16;            int tmp2 = str.indexOf(s2);            arr[i] = (byte) (tmp1 + tmp2 - 128);        }        return arr;    }
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