1  void asn1_length_der (unsigned long int len, unsigned char *ans, int *ans_len)
       2  {
       3      int k;
       4      unsigned char temp[4];
       5      if (len < 128) {
       6  	if (ans != ((void *) 0))
       7  	    ans[0] = (unsigned char) len;
       8  	*ans_len = 1;
       9      } else {
      10  	k = 0;
      11  	while (len) {
      12  	    temp[k++] = len & 0xFF;
      13  	    len = len >> 8;
      14  	}
      15  	*ans_len = k + 1;
      16  	if (ans != ((void *) 0)) {
      17  	    ans[0] = ((unsigned char) k & 0x7F) + 128;
      18  	    while (k--)
      19  		ans[*ans_len - 1 - k] = temp[k];
      20  	}
      21      }
      22  }