Subversion Repositories planix.SVN

Rev

Rev 2 | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
2 - 1 
#include <u.h>
2 
#include <libc.h>
3 
#include <mp.h>
4 
#include <libsec.h>
5 
 
6 
#define STRLEN(s)	(sizeof(s)-1)
7 
 
8 
uchar*
9 
decodepem(char *s, char *type, int *len)
10 
{
11 
	uchar *d;
12 
	char *t, *e, *tt;
13 
	int n;
14 
 
15 
	/*
16 
	 * find the correct section of the file, stripping garbage at the beginning and end.
17 
	 * the data is delimited by -----BEGIN <type>-----\n and -----END <type>-----\n
18 
	 */
19 
	n = strlen(type);
20 
	e = strchr(s, '\0');
21 
	for(t = s; t != nil && t < e; ){
22 
		tt = t;
23 
		t = strchr(tt, '\n');
24 
		if(t != nil)
25 
			t++;
26 
		if(strncmp(tt, "-----BEGIN ", STRLEN("-----BEGIN ")) == 0
27 
		&& strncmp(&tt[STRLEN("-----BEGIN ")], type, n) == 0
28 
		&& strncmp(&tt[STRLEN("-----BEGIN ")+n], "-----\n", STRLEN("-----\n")) == 0)
29 
			break;
30 
	}
31 
	for(tt = t; tt != nil && tt < e; tt++){
32 
		if(strncmp(tt, "-----END ", STRLEN("-----END ")) == 0
33 
		&& strncmp(&tt[STRLEN("-----END ")], type, n) == 0
34 
		&& strncmp(&tt[STRLEN("-----END ")+n], "-----\n", STRLEN("-----\n")) == 0)
35 
			break;
36 
		tt = strchr(tt, '\n');
37 
		if(tt == nil)
38 
			break;
39 
	}
40 
	if(tt == nil || tt == e){
41 
		werrstr("incorrect .pem file format: bad header or trailer");
42 
		return nil;
43 
	}
44 
 
45 
	n = ((tt - t) * 6 + 7) / 8;
46 
	d = malloc(n);
47 
	if(d == nil){
48 
		werrstr("out of memory");
49 
		return nil;
50 
	}
51 
	n = dec64(d, n, t, tt - t);
52 
	if(n < 0){
53 
		free(d);
54 
		werrstr("incorrect .pem file format: bad base64 encoded data");
55 
		return nil;
56 
	}
57 
	*len = n;
58 
	return d;
59 
}