add lf em 4x05protect plus lf config s option (#833)

[proxmark3-svn] / client / cmdlfem4x.c

diff --git a/client/cmdlfem4x.c b/client/cmdlfem4x.c
index cdaeb5ed282f30d5b10bc045d2d5beaf63a3cf51..d1bde91184e73e7a256dac95b227cd7c41ef4807 100644 (file)
--- a/client/cmdlfem4x.c
+++ b/client/cmdlfem4x.c
@@ -1161,6 +1161,119 @@ int CmdEM4x05WriteWord(const char *Cmd) {
        return EM4x05WriteWord(addr, data, pwd, usePwd, swap, invert);
 }
 
+int usage_lf_em_protect(void) {
+       PrintAndLog("Protect EM4x05.  Tag must be on antenna. ");
+       PrintAndLog("");
+       PrintAndLog("Usage:  lf em 4x05protect [h] d <data> p <pwd> [s] [i]");
+       PrintAndLog("Options:");
+       PrintAndLog("       h           - this help");
+       PrintAndLog("       d <data>    - data to write (hex)");
+       PrintAndLog("       p <pwd>     - password (hex) (optional)");
+       PrintAndLog("       s           - swap the data bit order before write");
+       PrintAndLog("       i           - invert the data bits before write");
+       PrintAndLog("samples:");
+       PrintAndLog("      lf em 4x05protect d 11223344");
+       PrintAndLog("      lf em 4x05protect p deadc0de d 11223344 s i");
+       return 0;
+}
+
+int EM4x05Protect(uint32_t data, uint32_t pwd, bool usePwd, bool swap, bool invert) {
+       if (swap) data = SwapBits(data, 32);
+
+       if (invert) data ^= 0xFFFFFFFF;
+
+       if ( !usePwd ) {
+               PrintAndLog("Writing Protect data %08X", data);
+       } else {
+               PrintAndLog("Writing Protect data %08X using password %08X", data, pwd);
+       }
+
+       uint16_t flag = usePwd;
+
+       UsbCommand c = {CMD_EM4X_PROTECT, {flag, data, pwd}};
+       clearCommandBuffer();
+       SendCommand(&c);
+       UsbCommand resp;
+       if (!WaitForResponseTimeout(CMD_ACK, &resp, 2000)){
+               PrintAndLog("Error occurred, device did not respond during protect operation.");
+               return -1;
+       }
+       if ( !downloadSamplesEM() ) {
+               return -1;
+       }
+       //check response for 00001010 for write confirmation!
+       //attempt demod:
+       uint32_t dummy = 0;
+       int result = demodEM4x05resp(&dummy,false);
+       if (result == 1) {
+               PrintAndLog("Protect Verified");
+       } else {
+               PrintAndLog("Protect could not be verified");
+       }
+       return result;
+}
+
+int CmdEM4x05ProtectWrite(const char *Cmd) {
+       bool errors = false;
+       bool usePwd = false;
+       uint32_t data = 0xFFFFFFFF;
+       uint32_t pwd = 0xFFFFFFFF;
+       bool swap = false;
+       bool invert = false;
+       bool gotData = false;
+       char cmdp = 0;
+       while(param_getchar(Cmd, cmdp) != 0x00)
+       {
+               switch(param_getchar(Cmd, cmdp))
+               {
+               case 'h':
+               case 'H':
+                       return usage_lf_em_write();
+               case 'd':
+               case 'D':
+                       data = param_get32ex(Cmd, cmdp+1, 0, 16);
+                       gotData = true;
+                       cmdp += 2;
+                       break;
+               case 'i':
+               case 'I':
+                       invert = true;
+                       cmdp++;
+                       break;
+               case 'p':
+               case 'P':
+                       pwd = param_get32ex(Cmd, cmdp+1, 1, 16);
+                       if (pwd == 1) {
+                               PrintAndLog("invalid pwd");
+                               errors = true;
+                       }
+                       usePwd = true;
+                       cmdp += 2;
+                       break;
+               case 's':
+               case 'S':
+                       swap = true;
+                       cmdp++;
+                       break;
+               default:
+                       PrintAndLog("Unknown parameter '%c'", param_getchar(Cmd, cmdp));
+                       errors = true;
+                       break;
+               }
+               if(errors) break;
+       }
+       //Validations
+       if(errors) return usage_lf_em_protect();
+
+       if ( strlen(Cmd) == 0 ) return usage_lf_em_protect();
+
+       if (!gotData) {
+               PrintAndLog("You must enter the data you want to write");
+               return usage_lf_em_protect();
+       }
+       return EM4x05Protect(data, pwd, usePwd, swap, invert);
+}
+
 void printEM4x05config(uint32_t wordData) {
        uint16_t datarate = EM4x05_GET_BITRATE(wordData);
        uint8_t encoder = ((wordData >> 6) & 0xF);
@@ -1345,6 +1458,7 @@ static command_t CommandTable[] =
        {"4x05info",  CmdEM4x05info, 0, "(pwd) -- Get info from EM4x05/EM4x69 tag"},
        {"4x05readword",  CmdEM4x05ReadWord, 0, "<Word> (pwd) -- Read EM4x05/EM4x69 word data"},
        {"4x05writeword", CmdEM4x05WriteWord, 0, "<Word> <data> (pwd) -- Write EM4x05/EM4x69 word data"},
+       {"4x05protect",   CmdEM4x05ProtectWrite, 0, "<data> (pwd) -- Write Protection to EM4x05"},
        {"4x50read",  CmdEM4x50Read, 1, "demod data from EM4x50 tag from the graph buffer"},
        {NULL, NULL, 0, NULL}
 };