code: protected int ceil(int a, int b)
      {
          int m = 0;
          if (a % b > 0)
          {
              m = 1;
          }
          return a / b + m;
      }
docs: Integer division with ceiling function.
  
  @see <a href="http://tools.ietf.org/html/rfc2898">RFC 2898 5.2 Step 2.</a>
  @param a Numerator
  @param b Denominator
  @return ceil(a/b)