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filesystem: check signature of loadables with cbc-mc

This commit is contained in:
schneider 2011-07-19 01:12:53 +02:00
parent 27412ef03d
commit 43eddd123b
2 changed files with 18 additions and 3 deletions
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19
firmware/filesystem/execute.c
View File

@ -10,11 +10,14 @@
#include "filesystem/ff.h"
#include "filesystem/select.h"
const uint32_t signature_key[4] = {0,0,0,0};
extern void * sram_top;
/**************************************************************************/
void execute_file (const char * fname){
void execute_file (const char * fname, uint8_t checksignature){
FRESULT res;
FIL file;
UINT readbytes;
@ -27,6 +30,7 @@ void execute_file (const char * fname){
dst=(void (*)(void)) 0x10001800;
res=f_open(&file, fname, FA_OPEN_EXISTING|FA_READ);
//lcdPrint("open: ");
//lcdPrintln(f_get_rc_string(res));
//lcdRefresh();
@ -41,7 +45,18 @@ void execute_file (const char * fname){
if(res){
return;
};
if( checksignature ){
uint32_t mac[4];
uint32_t *data = (uint32_t*)dst;
uint32_t len = readbytes/4;
xxtea_cbcmac(mac, (uint32_t*)dst, len-4, signature_key);
if( data[len-4] != mac[0] || data[len-3] != mac[1]
|| data[len-2] != mac[2] || data[len-1] != mac[3] ){
return;
}
}
//lcdPrintInt(readbytes);
//lcdPrintln(" bytes");
//lcdRefresh();
@ -60,6 +75,6 @@ void executeSelect(char *ext){
filename[2]=0;
if( selectFile(filename+2,ext) == 0)
execute_file(filename);
execute_file(filename,0);
};

2
firmware/filesystem/execute.h
View File

@ -1,7 +1,7 @@
#ifndef _EXECUTE_H_
#define _EXECUTE_H_
void execute_file (const char * fname);
void execute_file (const char * fname, uint8_t checksignature);
void executeSelect(char *ext);
#endif