def initCard():
log("Request to init new card")
card = None
while (card == None or card == 0):
card = pn532.read()
if (pn532.format() != 1):
log("Failed to format card")
return None
newhash = hashlib.sha256("%s %s %s" % (card[0],config.hashSecret,str(time.time()))).digest()
status = pn532.write(newhash)
if (status != 0):
log("Write failed: %s",(status))
return None
retries = 0
while(True):
card2 = pn532.read()
if ((card2[0] == card[0]) & (card2[1]==newhash)):
break
retries = retries + 1
if (retries > 5):
break
if ((card2[0] != card[0]) | (card2[1]!=newhash)):
log("Verify failed")
return None
log ("New card written serial=%s : hash=%s" % (card[0],binascii.hexlify(newhash)))
return(card[0],binascii.hexlify(newhash))
def writeHash(hash):
status = pn532.write(hash)
if (status==0):
log(" -> Write successful")
else:
log(" -> Write failed: err no "+status)
return False
card = pn532.read()
if (card == None or card == 0):
log(" -> Failed to read after write")
return False
if (card[1] != hash):
log(" -> Failed to verify hash")
return False
# If all that didn't fail, we must have succeeded!
return True
#!/usr/bin/python
import pn532
import hashlib
import binascii
pn532.init()
#print "Starting Value"
#print pn532.read()
print "Waiting for card..."
card = None
while (card == None or card == 0):
card = pn532.read()
print "Found Serial #", card[0]
print " hash -> ", binascii.hexlify(card[1])
newhash = hashlib.sha256(card[1]).digest()
print "New hash = ", binascii.hexlify(newhash)
print "Writing card"
#newhash = "12345678901234567890123456789012"
status = pn532.write(newhash)
if (status == 0):
print "Write successful"
else:
print "Write failed: err no", status
print "Final Hash Value"
print binascii.hexlify(pn532.read()[1])
pn532.close()
import binascii
import time
pn532.init()
card = None
while (card == None or card == 0):
card = pn532.read()
if (pn532.format() != 1):
print "Failed to format"
exit()
newhash = hashlib.sha256(card[0]+"newSecretValue"+time.time()).digest()
#print "New hash = ",binascii.hexlify(newhash)
#print "Writing card"
#newhash = "12345678901234567890123456789012"
status = pn532.write(newhash)
if (status != 0):
print "Write failed:\n",status
card2 = pn532.read()
if (card2 == card):
#Store in database
print "Success"
#print "Starting Value"
#print pn532.read()
#print "Waiting for card..."
#card = None
#while (card == None or card == 0):
# card = pn532.read()
#print "Found Serial #",card[0]
#print " hash -> ",binascii.hexlify(card[1])