Java HMAC-SHA1加密算法的实现

public static String hamcsha1(byte[] data, byte[] key)

{

      try {

          SecretKeySpec signingKey = new SecretKeySpec(key, "HmacSHA1");

          Mac mac = Mac.getInstance("HmacSHA1");

          mac.init(signingKey);

          return byte2hex(mac.doFinal(data));

      } catch (NoSuchAlgorithmException e) {

           e.printStackTrace();

      } catch (InvalidKeyException e) {

           e.printStackTrace();

      }

     return null;

 }

 //二行制转字符串

public static String byte2hex(byte[] b)

{

    StringBuilder hs = new StringBuilder();

    String stmp;

    for (int n = 0; b!=null && n < b.length; n++) {

        stmp = Integer.toHexString(b[n] & 0XFF);

        if (stmp.length() == 1)

            hs.append('0');

        hs.append(stmp);

    }

    return hs.toString().toUpperCase();

}