code: public static byte[] messageDigest(String value) {
          MessageDigest md5;
          try {
              md5 = MessageDigest.getInstance("MD5");
              md5.update(value.getBytes("UTF-8"));
              return md5.digest();
          } catch (NoSuchAlgorithmException e) {
              throw new SofaRpcRuntimeException("No such algorithm named md5", e);
          } catch (UnsupportedEncodingException e) {
              throw new SofaRpcRuntimeException("Unsupported encoding of" + value, e);
          }
      }
docs: 换算法？ MD5  SHA-1 MurMurHash???
  
  @param value the value
  @return the byte []