From 6dcdaf17fe9ed607f48d8288ca2068a93d3e51f1 Mon Sep 17 00:00:00 2001
From: schneider <schneider@blinkenlichts.net>
Date: Wed, 3 Aug 2011 17:38:30 +0200
Subject: [PATCH] added sendcard l0dable

---
 firmware/l0dable/EXPORTS     |  12 ++
 firmware/l0dable/loadable.ld |   2 +-
 firmware/l0dable/sendcard.c  | 284 +++++++++++++++++++++++++++++++++++
 3 files changed, 297 insertions(+), 1 deletion(-)
 create mode 100644 firmware/l0dable/sendcard.c

diff --git a/firmware/l0dable/EXPORTS b/firmware/l0dable/EXPORTS
index 05a3962..ea15048 100644
--- a/firmware/l0dable/EXPORTS
+++ b/firmware/l0dable/EXPORTS
@@ -35,3 +35,15 @@ push_queue
 the_config
 the_queue
 work_queue
+selectFile
+nrf_snd_pkt_crc_encr
+nrf_rcv_pkt_time_encr
+getInput
+ECIES_encyptkeygen
+f_open
+f_read
+strlen
+strcpy
+xxtea_encode_words
+getRandom
+crc16
diff --git a/firmware/l0dable/loadable.ld b/firmware/l0dable/loadable.ld
index fb4d66c..b569c2f 100644
--- a/firmware/l0dable/loadable.ld
+++ b/firmware/l0dable/loadable.ld
@@ -1,5 +1,5 @@
 MEMORY
 {
-    sram(rwx): ORIGIN = 0x10002000 - 2048, LENGTH = 2048
+    sram(rwx): ORIGIN = 0x10002000 - 2548, LENGTH = 2548
 }
 INCLUDE ram.ld
diff --git a/firmware/l0dable/sendcard.c b/firmware/l0dable/sendcard.c
new file mode 100644
index 0000000..8bcf110
--- /dev/null
+++ b/firmware/l0dable/sendcard.c
@@ -0,0 +1,284 @@
+#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 "funk/rftransfer.h"
+#include "funk/nrf24l01p.h"
+#include <basic/basic.h>
+#include <basic/random.h>
+#include <core/systick/systick.h>
+//#include <lcd/print.h>
+
+#include "usetable.h"
+
+//#include "lcd/print.h"
+
+
+
+uint8_t mac[5] = {1,2,3,2,1};
+
+void ram(void)
+{
+    char file[13];
+    selectFile(file,"TXT");
+    sendFile(file); 
+}
+
+void sendR(uint8_t *rx, uint8_t *ry)
+{
+    uint8_t exp[2 + 4*NUMWORDS + 2];
+    exp[0] = 'R';
+    for(int i=0; i<4*NUMWORDS; i++)
+        exp[2+i] = rx[i];
+    exp[1] = 'X';
+    nrf_snd_pkt_crc(32, exp);
+    delayms(10);
+    exp[1] = 'Y';
+    for(int i=0; i<4*NUMWORDS; i++)
+        exp[2+i] = ry[i]; 
+    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 receivePublicKey(uint8_t *px, uint8_t *py)
+{
+    return receiveKey('P',px,py);
+}
+
+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 receiveMac(uint8_t *mac)
+{
+    uint8_t buf[32]; 
+    uint8_t n;
+
+    n = nrf_rcv_pkt_time(100, 32, buf);
+    if( n == 32 && buf[0] == 'M' && buf[1] == 'C' ){
+        for(int i=0; i<5; i++)
+            mac[i] = buf[i+2];
+        return 0;
+    }
+    return -1;
+}
+
+int receiveKeys(uint8_t *px, uint8_t *py, uint8_t *mac)
+{
+    uint8_t done = 0;
+    char key;
+    while( !done ){
+        lcdClear();
+        lcdPrintln("Recv. PUBKEY");
+        lcdPrintln("Down=Abort");
+        lcdRefresh();
+        key = getInput();
+        delayms(20);
+        if( key == BTN_DOWN ){
+            return -1;
+        }
+        if( receivePublicKey(px,py) )
+            continue;
+        if( receiveMac(mac) )
+            continue;
+        lcdClear();
+        lcdPrintln("Got PUBKEY"); lcdRefresh(); 
+        lcdPrintln("Hash:");
+        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;
+}
+
+
+void sendFile(char *filename)
+{
+    uint8_t px[4*NUMWORDS];
+    uint8_t py[4*NUMWORDS];
+    uint8_t mac[5];
+    if( receiveKeys(px, py, mac) )
+        return;
+    
+    uint8_t done = 0;
+    uint8_t key;
+
+    uint8_t k1[16], k2[16], rx[4*NUMWORDS], ry[4*NUMWORDS];
+    
+    lcdClear();
+    lcdPrintln("Creating key"); lcdRefresh();
+    ECIES_encyptkeygen(px, py, k1, k2, rx, ry);
+    
+    while( !done ){
+        lcdPrintln("Sending file");lcdRefresh();
+        sendR(rx,ry);
+        delayms(3000);
+        filetransfer_send((uint8_t*)filename, 0, mac, (uint32_t*)k1);
+        lcdPrintln("Done");
+        lcdPrintln("Right=OK");
+        lcdPrintln("Left=Retry");
+        lcdRefresh();
+        while(1){
+            key = getInput();
+            delayms(20);
+            if( key == BTN_LEFT ){
+                break;
+            }else if( key == BTN_RIGHT ){
+                done = 1;
+                break;
+            }
+        } 
+        lcdClear();
+    }
+}
+//TODO: use a proper MAC to sign the message
+int filetransfer_send(uint8_t *filename, uint16_t size,
+                uint8_t *mac, uint32_t const k[4])
+{
+    uint8_t buf[MAXSIZE];
+    FIL file;
+    FRESULT res;
+    UINT readbytes;
+
+
+    if( size > MAXSIZE )
+        return 1;           //File to big
+ 
+    res=f_open(&file, (const char*)filename, FA_OPEN_EXISTING|FA_READ);
+    if( res )
+        return res;
+
+    //res = f_read(&file, (char *)buf, size, &readbytes);
+    for(uint16_t i=0; i<MAXSIZE; i++)
+        buf[i] = 0;
+
+    res = f_read(&file, (char *)buf, MAXSIZE, &readbytes);
+    size = readbytes;
+
+    if( res )
+        return res;
+    if( size != readbytes)
+        return 1;           //Error while reading
+    
+    uint16_t wordcount = (size+3)/4;
+    //uint8_t macbuf[5];
+
+    uint8_t metadata[32];
+    if( strlen((char*)filename) < 20 )
+        strcpy((char*)metadata, (char*)filename);
+    else
+        return 1;           //File name too long
+    metadata[20] = size >> 8;
+    metadata[21] = size & 0xFF;
+
+    //nrf_get_tx_max(5,macbuf);
+
+    //nrf_set_tx_mac(5, mac); 
+    nrf_snd_pkt_crc_encr(32, metadata, k); 
+    delayms(20);
+    xxtea_encode_words((uint32_t *)buf, wordcount, k);
+    rftransfer_send(wordcount*4, buf);
+    //nrf_set_tx_mac(5, macbuf);
+    return 0;
+}
+
+#define MAXPACKET   32
+void rftransfer_send(uint16_t size, uint8_t *data)
+{
+    uint8_t buf[MAXPACKET];
+    buf[0] = 'L';
+    buf[1] = size >> 8;
+    buf[2] = size & 0xFF;
+
+    uint16_t rand = getRandom() & 0xFFFF;
+    buf[3] = rand >> 8;
+    buf[4] = rand & 0xFF;
+
+    nrf_snd_pkt_crc(32,buf);     //setup packet
+    delayms(20);
+    uint16_t index = 0;
+    uint8_t i;
+    uint16_t crc = crc16(data,size);
+
+    while(size){
+        buf[0] = 'D';
+        buf[1] = index >> 8;
+        buf[2] = index & 0xFF;
+        buf[3] = rand >> 8;
+        buf[4] = rand & 0xFF;
+        for(i=5; i<MAXPACKET-2 && size>0; i++,size--){
+            buf[i] = *data++;
+        }
+        index++;
+        nrf_snd_pkt_crc(32,buf);     //data packet
+        delayms(20);
+    }
+
+    buf[0] = 'C';
+    buf[1] = crc >> 8;
+    buf[2] = crc & 0xFF;
+    buf[3] = rand >> 8;
+    buf[4] = rand & 0xFF;
+    nrf_snd_pkt_crc(32,buf);     //setup packet
+    delayms(20);
+}
+