char *silc_file_readfile(const char *filename, SilcUInt32 *return_len);

    Reads the content of `filename' to a buffer.  The allocated buffer is
    returned.  This does not NULL terminate the buffer but EOF terminate
    it.  The caller must replace the EOF with NULL if the buffer must be
    NULL terminated.

    If the `return_len' pointer is not NULL, it's filled with the length of
    the file.