From 2c997f95cb167e9023c1a44abaeda4ea80bbc7d3 Mon Sep 17 00:00:00 2001
From: Christian Pointner <equinox@spreadspace.org>
Date: Thu, 8 Aug 2013 22:39:50 +0000
Subject: moved usb-i2c-sl018 to tuer-rfid

git-svn-id: https://svn.spreadspace.org/avr/trunk@216 aa12f405-d877-488e-9caf-2d797e2a1cc7
---
 tuer-rfid/update-keys.c | 138 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 138 insertions(+)
 create mode 100644 tuer-rfid/update-keys.c

(limited to 'tuer-rfid/update-keys.c')

diff --git a/tuer-rfid/update-keys.c b/tuer-rfid/update-keys.c
new file mode 100644
index 0000000..d4dfd06
--- /dev/null
+++ b/tuer-rfid/update-keys.c
@@ -0,0 +1,138 @@
+/*
+ *  spreadspace avr utils
+ *
+ *
+ *  Copyright (C) 2013 Christian Pointner <equinox@spreadspace.org>
+ *
+ *  This file is part of spreadspace avr utils.
+ *
+ *  spreadspace avr utils is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  any later version.
+ *
+ *  spreadspace avr utils is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with spreadspace avr utils. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdint.h>
+#include <ctype.h>
+#include <stdio.h>
+#include <termios.h>
+
+#define EEPROM_SIZE 1024
+typedef uint8_t keyslot_t[8];
+
+/* this generates a Fletcher8 checksum  */
+/* code from: http://stackoverflow.com/questions/13491700/8-bit-fletcher-checksum-of-16-byte-data */
+uint8_t generate_csum(keyslot_t data)
+{
+  uint16_t sum1 = 0xf, sum2 = 0xf, len = sizeof(keyslot_t)-1;
+  do { sum2 += ( sum1 += *data++ ); } while (--len);
+  return sum2<<4 | sum1;
+}
+
+int send_key(keyslot_t key, FILE* dev)
+{
+  fwrite(key, sizeof(keyslot_t), 1, dev);
+  fflush(dev);
+  char tmp;
+  while(fread(&tmp, 1, 1, dev)) {
+    fwrite(&tmp, 1, 1, stdout);
+    if(tmp == 0) return 1;
+    if(tmp == '.') return 0;
+  }
+  return 0;
+}
+
+int main(int argc, char* argv[])
+{
+  if(argc<2) {
+    fprintf(stderr, "Usage: update-keys <device>\n");
+    return -1;
+  }
+  
+  FILE* dev;
+  dev = fopen(argv[1], "r+");
+  if(!dev) {
+    fprintf(stderr, "fopen failed!\n");
+    return -2;
+  }
+
+  int fd = fileno(dev);
+  struct termios t;
+  tcgetattr(fd, &t);
+  t.c_lflag &= ~(ICANON | ECHO);
+  t.c_iflag &= ~(ICRNL | INLCR | IXON | IXOFF);
+  cfmakeraw(&t);
+  tcflush(fd, TCIOFLUSH);
+  tcsetattr(fd, TCSANOW, &t);
+
+  fprintf(dev, "e");
+
+  char* line = NULL;
+  size_t len = 0;
+  int line_num = 0;
+  keyslot_t key;
+  int key_num = 0;
+
+  for(;;) {
+    ssize_t ret = getline(&line, &len, stdin);
+    if(ret <= 0) break;
+    line_num++;
+
+    int i;
+    for(i=0; i<len; ++i) {
+      if(!isxdigit(line[i])) {
+        line[i] = 0;
+        break;
+      }
+    }
+    if(i & 1 || i == 0 || i > (sizeof(keyslot_t)-1)*2) {
+      fprintf(stderr, "ignoring invalid key (odd number of digits or empty string or too long) at line %d\n", line_num);
+      continue;
+    }
+    uint8_t tmp[3];
+    int j;
+    tmp[2] = 0;
+    for(j = 0; j<(i/2); ++j) {
+      tmp[0] = line[j*2];
+      tmp[1] = line[j*2 + 1];
+      key[j] = (char)strtoul(tmp, NULL, 16);
+    }
+    for(j=i/2; j < sizeof(keyslot_t)-1; ++j) {
+      key[j] = 0;
+    }
+    key[sizeof(keyslot_t)-1] = generate_csum(key);
+    if(send_key(key, dev)) {
+      fprintf(stderr, "send_key failed at keyslot %d\n", key_num);
+      return 1;
+    }
+
+    key_num++;
+    if(key_num > EEPROM_SIZE/sizeof(keyslot_t)) {
+      fprintf(stderr, "reached maximum number of key slots (%d), will ignore remaining keys\n", EEPROM_SIZE/sizeof(keyslot_t));
+      break;
+    }
+  }
+  printf("\nread %d keys from STDIN - filling rest of keystore with invalid keys\n", key_num);
+  
+  int i;
+  for(i=0; i<=sizeof(keyslot_t)-1; ++i) key[i] = 0xFF;
+  for(i=key_num; i < EEPROM_SIZE/sizeof(keyslot_t); ++i) {
+    if(send_key(key, dev)) {
+      fprintf(stderr, "send_key failed at keyslot %d\n", key_num);
+      return 1;
+    }
+    key_num++;
+  }
+
+  printf("\nwrite of %d keys finished\n", key_num);
+
+  return 0;
+}
-- 
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