Trying to import a code from python2 to python 3 and this problem happens
<ipython-input-53-e9f33b00348a> in aesEncrypt(text, secKey)
43 def aesEncrypt(text, secKey):
44 pad = 16 - len(text) % 16
---> 45 text = text.encode("utf-8") + (pad * chr(pad)).encode("utf-8")
46 encryptor = AES.new(secKey, 2, '0102030405060708')
47 ciphertext = encryptor.encrypt(text)
AttributeError:'bytes' object has no attribute 'encode'
If I remove .encode("utf-8")
the error is "can't concat str to bytes". Apparently pad*chr(pad)
seems to be a byte string. It cannot use encode()
<ipython-input-65-9e84e1f3dd26> in aesEncrypt(text, secKey)
43 def aesEncrypt(text, secKey):
44 pad = 16 - len(text) % 16
---> 45 text = text.encode("utf-8") + (pad * chr(pad))
46 encryptor = AES.new(secKey, 2, '0102030405060708')
47 ciphertext = encryptor.encrypt(text)
TypeError: can't concat str to bytes
However, the weird thing is that if i just try the part along. encode() works fine.
text = { 'username': '', 'password': '', 'rememberLogin': 'true' }
text=json.dumps(text)
print(text)
pad = 16 - len(text) % 16
print(type(text))
text = text + pad * chr(pad)
print(type(pad * chr(pad)))
print(type(text))
text = text.encode("utf-8") + (pad * chr(pad)).encode("utf-8")
print(type(text))
{"username": "", "password": "", "rememberLogin": "true"}
<class 'str'>
<class 'str'>
<class 'str'>
<class 'bytes'>
If you don't know if a stringlike object is a Python 2 string (bytes) or Python 3 string (unicode). You could have a generic converter.
Python3 shell:
>>> def to_bytes(s):
... if type(s) is bytes:
... return s
... elif type(s) is str or (sys.version_info[0] < 3 and type(s) is unicode):
... return codecs.encode(s, 'utf-8')
... else:
... raise TypeError("Expected bytes or string, but got %s." % type(s))
...
>>> to_bytes("hello")
b'hello'
>>> to_bytes("hello".encode('utf-8'))
b'hello'
On Python 2 both these expressions evaluate to True
: type("hello") == bytes
and type("hello") == str
. And type(u"hello") == str
evaluates to False
, while type(u"hello") == unicode
is True
.
On Python 3 type("hello") == bytes
is False
, and type("hello") == str
is True
. And type("hello") == unicode
raises a NameError
exception since unicode
isn't defined on 3.
Python 2 shell:
>>> to_bytes(u"hello")
'hello'
>>> to_bytes("hello")
'hello'