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filetransfer: better mac handling

This commit is contained in:
schneider 2011-07-16 03:38:44 +02:00
parent 3cc27add50
commit b3e4323a37
1 changed files with 16 additions and 7 deletions
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23
firmware/funk/filetransfer.c
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@ -5,6 +5,8 @@
#include "basic/xxtea.h" #include "basic/xxtea.h"
#include "filesystem/ff.h" #include "filesystem/ff.h"
//TODO: use a proper MAC to sign the message
int filetransfer_send(uint8_t *filename, uint16_t size, int filetransfer_send(uint8_t *filename, uint16_t size,
uint8_t *mac, uint32_t const k[4]) uint8_t *mac, uint32_t const k[4])
{ {
@ -20,7 +22,10 @@ int filetransfer_send(uint8_t *filename, uint16_t size,
if( res ) if( res )
return res; return res;
res = f_read(&file, (char *)buf, size, &readbytes); //res = f_read(&file, (char *)buf, size, &readbytes);
res = f_read(&file, (char *)buf, MAXSIZE, &readbytes);
size = readbytes;
if( res ) if( res )
return res; return res;
if( size != readbytes) if( size != readbytes)
@ -38,8 +43,8 @@ int filetransfer_send(uint8_t *filename, uint16_t size,
metadata[21] = size & 0xFF; metadata[21] = size & 0xFF;
//nrf_get_tx_max(5,macbuf); //nrf_get_tx_max(5,macbuf);
nrf_set_tx_mac(5, mac);
nrf_set_tx_mac(5, mac);
nrf_snd_pkt_xxtea(30, metadata, k); nrf_snd_pkt_xxtea(30, metadata, k);
xxtea_encode_words((uint32_t *)buf, wordcount, k); xxtea_encode_words((uint32_t *)buf, wordcount, k);
rftransfer_send(wordcount*4, buf); rftransfer_send(wordcount*4, buf);
@ -56,11 +61,14 @@ int filetransfer_receive(uint8_t *mac, uint32_t const k[4])
FIL file; FIL file;
FRESULT res; FRESULT res;
uint8_t macbuf[5]; uint8_t macbuf[5];
//nrf_get_tx_max(5,macbuf); //nrf_get_rx_max(0,5,macbuf);
nrf_set_tx_mac(5, mac);
uint8_t metadata[30]; uint8_t metadata[30];
nrf_set_rx_mac(0, 32, 5, mac);
nrf_rcv_pkt_time_xxtea(1000, 30, metadata, k); nrf_rcv_pkt_time_xxtea(1000, 30, metadata, k);
nrf_set_rx_mac(0, 32, 5, macbuf);
metadata[19] = 0; //enforce termination metadata[19] = 0; //enforce termination
size = (metadata[20] << 8) | metadata[21]; size = (metadata[20] << 8) | metadata[21];
@ -72,9 +80,10 @@ int filetransfer_receive(uint8_t *mac, uint32_t const k[4])
return res; return res;
uint16_t wordcount = (size+3)/4; uint16_t wordcount = (size+3)/4;
nrf_set_rx_mac(0, 32, 5, mac);
rftransfer_receive(buf, wordcount*4, 1000); rftransfer_receive(buf, wordcount*4, 1000);
nrf_set_rx_mac(0, 32, 5, macbuf);
nrf_set_tx_mac(5, macbuf);
xxtea_decode_words((uint32_t *)buf, wordcount, k); xxtea_decode_words((uint32_t *)buf, wordcount, k);