1 0fc65b37 2004-03-21 devnull #include <u.h>
 2 0fc65b37 2004-03-21 devnull #include <libc.h>
 3 0fc65b37 2004-03-21 devnull #include <mp.h>
 4 0fc65b37 2004-03-21 devnull #include <libsec.h>
 5 0fc65b37 2004-03-21 devnull 
 6 0fc65b37 2004-03-21 devnull #define STRLEN(s)	(sizeof(s)-1)
 7 0fc65b37 2004-03-21 devnull 
 8 0fc65b37 2004-03-21 devnull uchar*
 9 0fc65b37 2004-03-21 devnull decodepem(char *s, char *type, int *len)
10 0fc65b37 2004-03-21 devnull {
11 0fc65b37 2004-03-21 devnull 	uchar *d;
12 0fc65b37 2004-03-21 devnull 	char *t, *e, *tt;
13 0fc65b37 2004-03-21 devnull 	int n;
14 0fc65b37 2004-03-21 devnull 
15 0fc65b37 2004-03-21 devnull 	*len = 0;
16 0fc65b37 2004-03-21 devnull 
17 0fc65b37 2004-03-21 devnull 	/*
18 0fc65b37 2004-03-21 devnull 	 * find the correct section of the file, stripping garbage at the beginning and end.
19 0fc65b37 2004-03-21 devnull 	 * the data is delimited by -----BEGIN <type>-----\n and -----END <type>-----\n
20 0fc65b37 2004-03-21 devnull 	 */
21 0fc65b37 2004-03-21 devnull 	n = strlen(type);
22 0fc65b37 2004-03-21 devnull 	e = strchr(s, '\0');
23 0fc65b37 2004-03-21 devnull 	for(t = s; t != nil && t < e; ){
24 0fc65b37 2004-03-21 devnull 		tt = t;
25 0fc65b37 2004-03-21 devnull 		t = strchr(tt, '\n');
26 0fc65b37 2004-03-21 devnull 		if(t != nil)
27 0fc65b37 2004-03-21 devnull 			t++;
28 0fc65b37 2004-03-21 devnull 		if(strncmp(tt, "-----BEGIN ", STRLEN("-----BEGIN ")) == 0
29 0fc65b37 2004-03-21 devnull 		&& strncmp(&tt[STRLEN("-----BEGIN ")], type, n) == 0
30 0fc65b37 2004-03-21 devnull 		&& strncmp(&tt[STRLEN("-----BEGIN ")+n], "-----\n", STRLEN("-----\n")) == 0)
31 0fc65b37 2004-03-21 devnull 			break;
32 0fc65b37 2004-03-21 devnull 	}
33 0fc65b37 2004-03-21 devnull 	for(tt = t; tt != nil && tt < e; tt++){
34 0fc65b37 2004-03-21 devnull 		if(strncmp(tt, "-----END ", STRLEN("-----END ")) == 0
35 0fc65b37 2004-03-21 devnull 		&& strncmp(&tt[STRLEN("-----END ")], type, n) == 0
36 0fc65b37 2004-03-21 devnull 		&& strncmp(&tt[STRLEN("-----END ")+n], "-----\n", STRLEN("-----\n")) == 0)
37 0fc65b37 2004-03-21 devnull 			break;
38 0fc65b37 2004-03-21 devnull 		tt = strchr(tt, '\n');
39 0fc65b37 2004-03-21 devnull 		if(tt == nil)
40 0fc65b37 2004-03-21 devnull 			break;
41 0fc65b37 2004-03-21 devnull 	}
42 0fc65b37 2004-03-21 devnull 	if(tt == nil || tt == e){
43 0fc65b37 2004-03-21 devnull 		werrstr("incorrect .pem file format: bad header or trailer");
44 0fc65b37 2004-03-21 devnull 		return nil;
45 0fc65b37 2004-03-21 devnull 	}
46 0fc65b37 2004-03-21 devnull 
47 0fc65b37 2004-03-21 devnull 	n = ((tt - t) * 6 + 7) / 8;
48 0fc65b37 2004-03-21 devnull 	d = malloc(n);
49 0fc65b37 2004-03-21 devnull 	if(d == nil){
50 0fc65b37 2004-03-21 devnull 		werrstr("out of memory");
51 0fc65b37 2004-03-21 devnull 		return nil;
52 0fc65b37 2004-03-21 devnull 	}
53 0fc65b37 2004-03-21 devnull 	n = dec64(d, n, t, tt - t);
54 0fc65b37 2004-03-21 devnull 	if(n < 0){
55 0fc65b37 2004-03-21 devnull 		free(d);
56 0fc65b37 2004-03-21 devnull 		werrstr("incorrect .pem file format: bad base64 encoded data");
57 0fc65b37 2004-03-21 devnull 		return nil;
58 0fc65b37 2004-03-21 devnull 	}
59 0fc65b37 2004-03-21 devnull 	*len = n;
60 0fc65b37 2004-03-21 devnull 	return d;
61 0fc65b37 2004-03-21 devnull }