add : writing on PCF7931 tags

[proxmark3-svn] / client / cmdlfpcf7931.c

diff --git a/client/cmdlfpcf7931.c b/client/cmdlfpcf7931.c
index 0d8fb93d4c2d89024d26507f8039e2657a66b4b5..8265126e3798b2cdf0dd4d2204323061762501d5 100644 (file)
--- a/client/cmdlfpcf7931.c
+++ b/client/cmdlfpcf7931.c
@@ -1,6 +1,7 @@
 //-----------------------------------------------------------------------------
 // Copyright (C) 2012 Chalk <chalk.secu at gmail.com>
-//
+//               2015 Dake <thomas.cayrou at gmail.com>
+
 // This code is licensed to you under the terms of the GNU GPL, version 2 or,
 // at your option, any later version. See the LICENSE.txt file for the text of
 // the license.
@@ -21,6 +22,8 @@
 
 static int CmdHelp(const char *Cmd);
 
+struct pcf7931_config configPcf = {{0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF},17500,{0,0}};
+
 int CmdLFPCF7931Read(const char *Cmd)
 {
   UsbCommand c = {CMD_PCF7931_READ};
@@ -30,10 +33,93 @@ int CmdLFPCF7931Read(const char *Cmd)
   return 0;
 }
 
+int CmdLFPCF7931Config(const char *Cmd)
+{ 
+  int res = 0;
+  res = sscanf(Cmd, "%02x %02x %02x %02x %02x %02x %02x %d %d %d", &configPcf.password[0], &configPcf.password[1], &configPcf.password[2], &configPcf.password[3], &configPcf.password[4], &configPcf.password[5], &configPcf.password[6], &configPcf.init_delay, &configPcf.offset[0], &configPcf.offset[1]);
+
+  if (res >= 7 || res < 1){
+      if(res == 7) configPcf.init_delay = 17500; //default value
+      
+      if(res<=8){
+        configPcf.offset[0] = -10; //default value
+        configPcf.offset[1] = 30; //default value
+      }
+     
+      if(res < 1){
+         PrintAndLog("Usage: <password byte 1 (in hex, lsb first)> <password byte 2  (in hex, lsb first)> [...] <password byte 7  (in hex, lsb first)> <tag initialization delay (in us)> <optional : offset on the low pulses width (in us)> <optional : offset on the low pulses position (in us)>");
+         PrintAndLog("The time offsets could be usefull to correct slew rate generated by the antenna.");
+      }
+
+      PrintAndLog("Current configuration :");
+      PrintAndLog("Password (LSB first on each byte) : %02x %02x %02x %02x %02x %02x %02x", configPcf.password[0], configPcf.password[1], configPcf.password[2], configPcf.password[3], configPcf.password[4], configPcf.password[5], configPcf.password[6]);
+      PrintAndLog("Tag initialization delay : %d us", configPcf.init_delay);
+      PrintAndLog("Offsets : %d us on the low pulses width, %d us on the low pulses positions", configPcf.offset[0], configPcf.offset[1]);
+
+      return 0;
+  }
+
+  //default values
+  configPcf.password[0] = 0xFF;  
+  configPcf.password[1] = 0xFF;  
+  configPcf.password[2] = 0xFF;  
+  configPcf.password[3] = 0xFF;  
+  configPcf.password[4] = 0xFF;  
+  configPcf.password[5] = 0xFF;  
+  configPcf.password[6] = 0xFF;
+
+  configPcf.init_delay = 17500;
+  configPcf.offset[0] = 0; 
+  configPcf.offset[1] = 0; 
+
+  PrintAndLog("Incorrect format");
+  PrintAndLog("Examples of right usage : lf pcf7931 config 11 22 33 44 55 66 77 20000");
+  PrintAndLog("                          lf pcf7931 config FF FF FF FF FF FF FF 17500 -10 30");
+  return 0;
+}
+
+
+
+int CmdLFPCF7931Write(const char *Cmd)
+{
+  UsbCommand c = {CMD_PCF7931_WRITE};
+
+  int res = 0;
+  res = sscanf(Cmd, "%x %x %x", &c.arg[0], &c.arg[1], &c.arg[2]);
+
+  if(res < 1) {
+      PrintAndLog("Please specify the block address in hex");
+      return 0;
+  }
+  if (res == 1){ 
+    PrintAndLog("Please specify the byte address in hex");
+     return 0;
+  }
+  if(res == 2) {
+    PrintAndLog("Please specify the data in hex (1 byte)");
+     return 0;
+  }
+  if(res == 3) {
+    uint8_t n=0;
+    for(n=0;n<7;n++)  c.d.asDwords[n] = configPcf.password[n];
+    c.d.asDwords[7] = (configPcf.offset[0]+128);
+    c.d.asDwords[8] = (configPcf.offset[1]+128);
+    c.d.asDwords[9] = configPcf.init_delay;
+    SendCommand(&c);
+    return 0;
+  }
+
+  PrintAndLog("INCORRECT FORMAT");
+  return 0;
+}
+
+
 static command_t CommandTable[] = 
 {
   {"help", CmdHelp, 1, "This help"},
   {"read", CmdLFPCF7931Read, 1, "Read content of a PCF7931 transponder"},
+  {"write", CmdLFPCF7931Write, 1, "Write data on a PCF7931 transponder. Usage : lf pcf7931 write <bloc address> <byte address> <data>"},
+   {"config", CmdLFPCF7931Config, 1, "Configure the password, the tags initialization delay and time offsets (optional)"},
   {NULL, NULL, 0, NULL}
 };