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added receive card l0adable

This commit is contained in:
schneider 2011-08-03 19:00:26 +02:00
parent c856eb4f99
commit 2799821daf
2 changed files with 347 additions and 0 deletions
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7
firmware/l0dable/EXPORTS
View File

@ -47,3 +47,10 @@ strcpy
xxtea_encode_words xxtea_encode_words
getRandom getRandom
crc16 crc16
f_write
f_close
ECIES_decryptkeygen
bitstr_parse_export
f_get_rc_string
xxtea_decode_words
systickGetTicks

340
firmware/l0dable/recvcard.c Normal file
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@ -0,0 +1,340 @@
#include <sysinit.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <stdint.h>
#include "basic/basic.h"
#include "lcd/render.h"
#include "lcd/allfonts.h"
#include "basic/ecc.h"
#include "funk/nrf24l01p.h"
#include "filesystem/ff.h"
#include "filesystem/diskio.h"
#include "funk/filetransfer.h"
#include "lcd/print.h"
#include <string.h>
#include "funk/nrf24l01p.h"
#include "funk/filetransfer.h"
#include "funk/rftransfer.h"
#include "basic/basic.h"
#include "basic/xxtea.h"
#include "filesystem/ff.h"
#include "lcd/print.h"
#include "usetable.h"
uint8_t mac[5] = {1,2,3,2,1};
void ram(void)
{
if( sendKeys() )
return;
char priv[42];
UINT readbytes;
FIL file;
if( f_open(&file, "priv.key", FA_OPEN_EXISTING|FA_READ) ){
return;
}
if( f_read(&file, priv, 41, &readbytes) || readbytes != 41 ){
return;
}
f_close(&file);
priv[41] = 0;
uint8_t done = 0;
uint8_t key;
uint8_t k1[16], k2[16], rx[4*NUMWORDS], ry[4*NUMWORDS];
while( !done ){
lcdClear();
lcdPrintln("Receiving file");
lcdPrintln("Down=Abort");
lcdRefresh();
key = getInput();
delayms(20);
if( key == BTN_DOWN ){
return -1;
}
if( receiveR(rx,ry) )
continue;
lcdPrintln("Creating key");
lcdRefresh();
ECIES_decryptkeygen(rx, ry, k1, k2, priv);
if( filetransfer_receive(mac,(uint32_t*)k1) < 0 )
continue;
lcdPrintln("Right=OK");
lcdPrintln("Left=Retry");
lcdPrintln("Down=Abort");
lcdRefresh();
while(1){
key = getInput();
delayms(20);
if( key == BTN_LEFT ){
break;
}else if( key == BTN_RIGHT ){
done = 1;
break;
}else if( key == BTN_DOWN ){
return -1;
}
}
}
}
void sendPublicKey(void)
{
uint8_t exp[2 + 4*NUMWORDS + 2];
char buf[42];
UINT readbytes;
FIL file;
if( f_open(&file, "pubx.key", FA_OPEN_EXISTING|FA_READ) ){
return;
}
if( f_read(&file, buf, 41, &readbytes) || readbytes != 41 ){
return;
}
f_close(&file);
buf[41] = 0;
exp[0] = 'P';
bitstr_parse_export((char*)exp+2, buf);
exp[1] = 'X';
nrf_snd_pkt_crc(32, exp);
delayms(10);
if( f_open(&file, "puby.key", FA_OPEN_EXISTING|FA_READ) ){
return;
}
if( f_read(&file, buf, 41, &readbytes) || readbytes != 41 ){
return;
}
f_close(&file);
buf[41] = 0;
exp[1] = 'Y';
bitstr_parse_export((char*)exp+2, buf);
nrf_snd_pkt_crc(32, exp);
delayms(10);
}
int receiveKey(uint8_t type, uint8_t *x, uint8_t *y)
{
uint8_t buf[32];
uint8_t n;
n = nrf_rcv_pkt_time(1000, 32, buf);
if( n == 32 && buf[0] == type && buf[1] == 'X' ){
for(int i=0; i<NUMWORDS*4; i++)
x[i] = buf[i+2];
n = nrf_rcv_pkt_time(100, 32, buf);
if( n == 32 && buf[0] ==type && buf[1] == 'Y' ){
for(int i=0; i<NUMWORDS*4; i++)
y[i] = buf[i+2];
return 0;
}
}
return -1;
}
int receiveR(uint8_t *rx, uint8_t *ry)
{
return receiveKey('R',rx,ry);
}
void sendMac(void)
{
uint8_t buf[32];
buf[0] = 'M';
buf[1] = 'C';
buf[2] = mac[0];
buf[3] = mac[1];
buf[4] = mac[2];
buf[5] = mac[3];
buf[6] = mac[4];
nrf_snd_pkt_crc(32, buf);
delayms(10);
}
int sendKeys(void)
{
uint8_t done = 0;
char key;
while( !done ){
lcdClear();
lcdPrintln("Sending PUBKEY");lcdRefresh();
sendPublicKey();
sendMac();
lcdPrintln("Done");
lcdPrintln("Right=OK");
lcdPrintln("Left=Retry");
lcdPrintln("Down=Abort");
lcdRefresh();
while(1){
key = getInput();
delayms(20);
if( key == BTN_LEFT ){
break;
}else if( key == BTN_RIGHT ){
done = 1;
break;
}else if( key == BTN_DOWN ){
return -1;
}
}
}
return 0;
}
int filetransfer_receive(uint8_t *mac, uint32_t const k[4])
{
uint8_t buf[MAXSIZE+1];
uint16_t size;
uint8_t n;
UINT written = 0;
FIL file;
FRESULT res;
//uint8_t macbuf[5];
//nrf_get_rx_max(0,5,macbuf);
uint8_t metadata[32];
//nrf_set_rx_mac(0, 32, 5, mac);
n = nrf_rcv_pkt_time_encr(3000, 32, metadata, k);
if( n != 32 )
return 1; //timeout
//nrf_set_rx_mac(0, 32, 5, macbuf);
//lcdPrintln("got meta"); lcdRefresh();
metadata[19] = 0; //enforce termination
size = (metadata[20] << 8) | metadata[21];
if( size > MAXSIZE ) {lcdPrintln("too big"); lcdRefresh(); while(1);}
if( size > MAXSIZE ) return 1; //file to big
//if(fileexists(metadata)) return 1; //file already exists
//lcdPrint("open"); lcdPrintln((const char*)metadata); lcdRefresh();
res = f_open(&file, (const char*)metadata, FA_OPEN_ALWAYS|FA_WRITE);
//lcdPrintln("file opened"); lcdRefresh();
if( res ) {lcdPrintln("res"); lcdPrint(f_get_rc_string(res)); lcdRefresh(); while(1);}
if( res )
return res;
uint16_t wordcount = (size+3)/4;
//nrf_set_rx_mac(0, 32, 5, mac);
//lcdPrintln("get file"); lcdRefresh();
int fres = rftransfer_receive(buf, wordcount*4, 1000);
if( fres == -1 ){
lcdPrintln("checksum wrong");
}else if( fres == -2 ){
lcdPrintln("timeout");
}else{
//lcdPrintln("got file");
}
lcdRefresh();
if( fres < 0 )
return 1;
//nrf_set_rx_mac(0, 32, 5, macbuf);
xxtea_decode_words((uint32_t *)buf, wordcount, k);
res = f_write(&file, buf, size, &written);
f_close(&file);
if( res )
return res;
if( written != size )
return 1; //error while writing
lcdClear();
lcdPrintln("Received"); lcdPrintln((const char*)metadata); lcdRefresh();
return 0;
}
#define MAXPACKET 32
int16_t rftransfer_receive(uint8_t *buffer, uint16_t maxlen, uint16_t timeout)
{
uint8_t buf[MAXPACKET];
uint8_t state = 0;
uint16_t pos = 0, seq = 0, size = 0, rand = 0, crc = 0;
int n,i;
unsigned int currentTick = systickGetTicks();
unsigned int startTick = currentTick;
while(systickGetTicks() < (startTick+timeout) ){//this fails if either overflows
n = nrf_rcv_pkt_time(1000, MAXPACKET, buf);
switch(state){
case 0:
if( n == 32 && buf[0] == 'L' ){
size = (buf[1] << 8) | buf[2];
rand = (buf[3] << 8) | buf[4];
seq = 0;
pos = 0;
if( size <= maxlen ){
//lcdClear();
//lcdPrint("got l="); lcdPrintInt(size);
//lcdPrintln(""); lcdRefresh();
state = 1;
}
}
break;
case 1:
if( n == 32 && buf[0] == 'D' && ((buf[3]<<8)|buf[4])==rand ){
//lcdPrint("got d"); lcdRefresh();
if( seq == ((buf[1]<<8)|buf[2]) ){
//lcdPrintln(" in seq"); lcdRefresh();
for(i=5; i<n-2 && pos<size; i++,pos++){
buffer[pos] = buf[i];
}
seq++;
}
}
if( pos == size ){
//lcdPrintln("got all"); lcdRefresh();
crc = crc16(buffer, size);
state = 2;
}
break;
case 2:
if( n == 32 && buf[0] == 'C' && ((buf[3]<<8)|buf[4])==rand){
//lcdPrint("got crc"); lcdRefresh();
if( crc == ((buf[1]<<8)|buf[2]) ){
//lcdPrintln(" ok"); lcdRefresh();
return size;
}else{
//lcdPrintln(" nok"); lcdRefresh();
return -1;
}
}
break;
};
}
//lcdPrintln("Timeout"); lcdRefresh();
return -2;
}
#if 0
int ECIES_decryptkeygen(uint8_t *rx, uint8_t *ry,
uint8_t k1[16], uint8_t k2[16], const char *privkey)
{
elem_t Rx, Ry, Zx, Zy;
exp_t d;
bitstr_import(Rx, (char*)rx);
bitstr_import(Ry, (char*)ry);
if (ECIES_embedded_public_key_validation(Rx, Ry) < 0)
return -1;
bitstr_parse(d, privkey);
point_copy(Zx, Zy, Rx, Ry);
point_mult(Zx, Zy, d);
point_double(Zx, Zy); /* cofactor h = 2 on B163 */
if (point_is_zero(Zx, Zy))
return -1;
ECIES_kdf((char*)k1,(char*) k2, Zx, Rx, Ry);
return 0;
}
#endif