asn1_length_der(unsigned long int len,unsigned char * ans,int * ans_len)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 }
23