mirror of https://github.com/0intro/conterm
60 lines
1.3 KiB
C
60 lines
1.3 KiB
C
|
#include <u.h>
|
||
|
|
#include <libc.h>
|
||
|
|
#include <mp.h>
|
||
|
|
#include <libsec.h>
|
||
|
|
|
||
|
|
#define STRLEN(s) (sizeof(s)-1)
|
||
|
|
|
||
|
|
uchar*
|
||
|
|
decodepem(char *s, char *type, int *len)
|
||
|
|
{
|
||
|
|
uchar *d;
|
||
|
|
char *t, *e, *tt;
|
||
|
|
int n;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* find the correct section of the file, stripping garbage at the beginning and end.
|
||
|
|
* the data is delimited by -----BEGIN <type>-----\n and -----END <type>-----\n
|
||
|
|
*/
|
||
|
|
n = strlen(type);
|
||
|
|
e = strchr(s, '\0');
|
||
|
|
for(t = s; t != nil && t < e; ){
|
||
|
|
tt = t;
|
||
|
|
t = strchr(tt, '\n');
|
||
|
|
if(t != nil)
|
||
|
|
t++;
|
||
|
|
if(strncmp(tt, "-----BEGIN ", STRLEN("-----BEGIN ")) == 0
|
||
|
|
&& strncmp(&tt[STRLEN("-----BEGIN ")], type, n) == 0
|
||
|
|
&& strncmp(&tt[STRLEN("-----BEGIN ")+n], "-----\n", STRLEN("-----\n")) == 0)
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
for(tt = t; tt != nil && tt < e; tt++){
|
||
|
|
if(strncmp(tt, "-----END ", STRLEN("-----END ")) == 0
|
||
|
|
&& strncmp(&tt[STRLEN("-----END ")], type, n) == 0
|
||
|
|
&& strncmp(&tt[STRLEN("-----END ")+n], "-----\n", STRLEN("-----\n")) == 0)
|
||
|
|
break;
|
||
|
|
tt = strchr(tt, '\n');
|
||
|
|
if(tt == nil)
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
if(tt == nil || tt == e){
|
||
|
|
werrstr("incorrect .pem file format: bad header or trailer");
|
||
|
|
return nil;
|
||
|
|
}
|
||
|
|
|
||
|
|
n = ((tt - t) * 6 + 7) / 8;
|
||
|
|
d = malloc(n);
|
||
|
|
if(d == nil){
|
||
|
|
werrstr("out of memory");
|
||
|
|
return nil;
|
||
|
|
}
|
||
|
|
n = dec64(d, n, t, tt - t);
|
||
|
|
if(n < 0){
|
||
|
|
free(d);
|
||
|
|
werrstr("incorrect .pem file format: bad base64 encoded data");
|
||
|
|
return nil;
|
||
|
|
}
|
||
|
|
*len = n;
|
||
|
|
return d;
|
||
|
|
}
|