AES对称加密解密类

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import java.io.UnsupportedEncodingException; import javax.crypto.Cipher; import javax.crypto.spec.SecretKeySpec;   ///** AES对称加密解密类 **/ public class Aes {    // /** 算法/模式/填充 **/    private static final String CipherMode = "AES/ECB/PKCS5Padding";    ///** 创建密钥 **/    private static SecretKeySpec createKey(String password) {       byte[] data = null;       if (password == null) {          password = "";       }       StringBuffer sb = new StringBuffer(32);       sb.append(password);       while (sb.length() < 32) {          sb.append("0");       }       if (sb.length() > 32) {          sb.setLength(32);       }         try {          data = sb.toString().getBytes("UTF-8");       } catch (UnsupportedEncodingException e) {          e.printStackTrace();       }       return new SecretKeySpec(data, "AES");    }    // /** 加密字节数据 **/    public static byte[] encrypt(byte[] content, String password) {       try {          SecretKeySpec key = createKey(password);          System.out.println(key);          Cipher cipher = Cipher.getInstance(CipherMode);          cipher.init(Cipher.ENCRYPT_MODE, key);          byte[] result = cipher.doFinal(content);          return result;       } catch (Exception e) {          e.printStackTrace();       }       return null;    }      ///** 加密(结果为16进制字符串) **/    public static String encrypt(String content, String password) {       byte[] data = null;       try {          data = content.getBytes("UTF-8");       } catch (Exception e) {          e.printStackTrace();       }       data = encrypt(data, password);       String result = byte2hex(data);       return result;    }      // /** 解密字节数组 **/    public static byte[] decrypt(byte[] content, String password) {       try {          SecretKeySpec key = createKey(password);          Cipher cipher = Cipher.getInstance(CipherMode);          cipher.init(Cipher.DECRYPT_MODE, key);          byte[] result = cipher.doFinal(content);          return result;       } catch (Exception e) {          e.printStackTrace();       }       return null;    }      ///** 解密16进制的字符串为字符串 **/    public static String decrypt(String content, String password) {       byte[] data = null;       try {          data = hex2byte(content);       } catch (Exception e) {          e.printStackTrace();       }       data = decrypt(data, password);       if (data == null)          return null;       String result = null;       try {          result = new String(data, "UTF-8");       } catch (UnsupportedEncodingException e) {          e.printStackTrace();       }       return result;    }      // /** 字节数组转成16进制字符串 **/    public static String byte2hex(byte[] b) { // 一个字节的数，       StringBuffer sb = new StringBuffer(b.length * 2);       String tmp = "";       for (int n = 0; n < b.length; n++) {          // 整数转成十六进制表示          tmp = (Integer.toHexString(b[n] & 0XFF));          if (tmp.length() == 1) {             sb.append("0");          }          sb.append(tmp);       }       return sb.toString().toUpperCase(); // 转成大写    }      // /** 将hex字符串转换成字节数组 **/    private static byte[] hex2byte(String inputString) {       if (inputString == null || inputString.length() < 2) {          return new byte[0];       }       inputString = inputString.toLowerCase();       int l = inputString.length() / 2;       byte[] result = new byte[l];       for (int i = 0; i < l; ++i) {          String tmp = inputString.substring(2 * i, 2 * i + 2);          result[i] = (byte) (Integer.parseInt(tmp, 16) & 0xFF);       }       return result;    } }