paperTrust/full_check_process.txt at master · kdickerson/paperTrust · GitHub

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Python 2.6.6 (r266:84292, Sep 15 2010, 15:52:39)
[GCC 4.4.5] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import M2Crypto
>>> import os
>>> M2Crypto.Rand.rand_seed(os.urandom(1024))
>>> bank_key = M2Crypto.RSA.gen_key(1024, 65537)
...............++++++
........++++++
>>> bank_key.save_key('demo-private.pem', None)
1
>>> bank_key.save_pub_key('demo-public.pem')
1
>>> check_data = {}
>>> check_data.date = "4/12/2011"
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'dict' object has no attribute 'date'
>>> check_data['date'] = "4/12/2011"
>>> check_data['amount'] = "132.45"
>>> check_data['check_num'] = "1001"
>>> check_data['routing'] = "12345678"
>>> check_data['account'] = "87654321"
>>> check_data
{'date': '4/12/2011', 'check_num': '1001', 'amount': '132.45', 'account': '87654321', 'routing': '12345678'}
>>> check_data['recipient'] = "Kyle Dickerson"
>>> print str(check_data)
{'account': '87654321', 'check_num': '1001', 'amount': '132.45', 'routing': '12345678', 'date': '4/12/2011', 'recipient': 'Kyle Dickerson'}
>>> check_data_str = str(check_data)
>>> signEVP = M2Crypto.EVP.load_key('demo-private.pem')
>>> signEVP.sign_init()
>>> signEVP.sign_update(check_data_str)
>>> string_sig = signEVP.sign_final()
>>> print string_sig.encode('base64')
edFtvkMpR+RfigxrVTGHz2mmzJNtG25CGNKUcltRfR1bcR6/sOMVac0u987xRfqABxxGGxg+qv2W
WF67Hy/eU6lxQ1lOKKSQOCdPO+E/E5osCombiUqCHZ1to0Y/VbjPhDsZ/ptk9NaMSTbqMqvBXuQF
hmETCyFayffvjJ63jIA=

>>> import qrencode
>>> check_qr_code = qrencode.encode_scaled(check_data_str.encode('base64'), 150)
>>> #check_qr_code[2].save('check_data.png')
>>> qr_code = qrencode.encode_scaled(string_sig.encode('base64'), 150)
>>> #qr_code[2].save("signed_check.png")
>>>
>>> import Image
>>>
>>> blank_check = Image.open('blankcheck.jpg').convert('L')
>>> blank_check.paste(check_data_img, (100,50))
>>> blank_check.paste(check_sig_img, (300,50))
>>> blank_check.save('filled_check.png')
>>>
>>>
>>> import zbar
>>> scanner = zbar.ImageScanner()
>>> scanner.parse_config('enable')

>>> pil = Image.open('filled_check.png').convert('L')
>>> width, height = pil.size
>>> raw = pil.tostring()
>>> image = zbar.Image(width, height, 'Y800', raw)
>>> scanner.scan(image)
2
>>> disovered_codes = []
>>> for symbol in image:
...   if str(symbol.type) == 'QRCODE':
...     discoverd_codes.append(symbol.data.decode('base64'))
...
>>> discovered_codes[0]
"{'account': '87654321', 'check_num': '1001', 'amount': '132.45', 'routing': '12345678', 'date': '4/12/2011', 'recipient': 'Kyle Dickerson'}"
>>> discovered_codes[1].encode('base64')
'edFtvkMpR+RfigxrVTGHz2mmzJNtG25CGNKUcltRfR1bcR6/sOMVac0u987xRfqABxxGGxg+qv2W\nWF67Hy/eU6lxQ1lOKKSQOCdPO+E/E5osCombiUqCHZ1to0Y/VbjPhDsZ/ptk9NaMSTbqMqvBXuQF\nhmETCyFayffvjJ63jIA=\n'
>>> pub_key = M2Crypto.RSA.load_pub_key('demo-public.pem')
>>> verifyEVP = M2Crypto.EVP.PKey()
>>> verifyEVP.assign_rsa(pub_key)
1
>>> verifyEVP.verify_init()
>>> verifyEVP.verify_update(discovered_codes[0])
1
>>> if verifyEVP.verify_final(discovered_codes[1]) == 1:
...   print "Signature Verified"
... else:
...   print "Not valid signature!"
...
Signature Verified
>>> verifyEVP.verify_final(discovered_codes[1])
1