Пример #1
0
        /// <summary>Use a special char to padd up to AES block.
        /// TODO upgrade the java side
        /// Reference:
        /// \u2020, ? , a char not easy to be keyed in
        /// https://www.unicode.org/charts/PDF/Unicode-3.2/U32-2000.pdf
        /// \u0000, Nil
        /// https://www.unicode.org/charts/PDF/U0000.pdf
        /// </summary>
        /// <param name="s"></param>
        /// <returns> 16 / 32 byte string
        /// </returns>
        /// <exception cref="Exception"></exception>
        private static byte[] pad16_32(string s)
        {
            int l = Encoding.Unicode.GetByteCount(s);

            if (l <= 16)
            {
                l = 16;
            }
            else if (l <= 32)
            {
                l = 32;
            }
            else
            {
                throw new Exception("Not supported block length(16B/32B): " + s);
            }

            byte[] buf = new byte[l];

            LangExt.Fill <byte>(buf, 0);

            Encoding.Unicode.GetBytes(s, 0, s.Length, buf, 0);
            return(buf);
        }