Initial commit

wipe.py

@@ -0,0 +1,69 @@
+#!/usr/bin/env python
+
+#!/usr/bin/env python
+import RPi.GPIO as GPIO
+import MFRC522
+import signal
+
+# Keys
+DEFAULT_KEY = [0xFF,0xFF,0xFF,0xFF,0xFF,0xFF]
+KEY_S0 = [0x20, 0x20, 0x20, 0x20, 0x20, 0x20]
+
+# Selecting key
+KEY = DEFAULT_KEY
+
+def uid_to_num(uid):
+    n = 0
+    for i in range(0, 5):
+        n = n * 256 + uid[i]
+    return n
+
+MIFAREReader = MFRC522.MFRC522()
+
+print "Waiting for tag...\n"
+
+while True:
+
+    sector = 1
+
+    while True:
+
+        (status, TagSize) = MIFAREReader.MFRC522_Request(MIFAREReader.PICC_REQIDL)
+
+        if status != MIFAREReader.MI_OK:
+            continue
+
+        if sector >= TagSize:
+            break
+
+        print "Wiping sector", sector, "..."
+
+        # Selecting blocks
+        BlockAddrs = [ (sector * 4), (sector * 4 + 1), (sector * 4 + 2) ]
+        TrailerBlockAddr = (sector * 4 + 3)
+
+        # Writing data
+        (status, UID) = MIFAREReader.MFRC522_Anticoll()
+
+        if status != MIFAREReader.MI_OK:
+            break
+
+        MIFAREReader.MFRC522_SelectTag(UID)
+        status = MIFAREReader.MFRC522_Auth(MIFAREReader.PICC_AUTHENT1A, TrailerBlockAddr, KEY, UID)
+        if status == MIFAREReader.MI_OK:
+            data = bytearray()
+            data.extend(bytearray("".ljust(len(BlockAddrs) * 16)))
+            i = 0
+            for block_num in BlockAddrs:
+                MIFAREReader.MFRC522_Write(block_num, data[(i*16):(i+1)*16])
+                i += 1
+            print "Sector", sector, "wiped!"
+        else:
+            print "Can't access sector", sector, "!"
+        MIFAREReader.MFRC522_StopCrypto1()
+        sector += 1
+
+    print "\nTag wiped!"
+    break
+
+GPIO.cleanup()