1void 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}
23