Python TypeError Object type class str cannot be passed to C code

Question

I am trying to run the following code:

from Cryptodome.Cipher import AES

key = '0123456789abcdef'
IV='0123456789abcdef'
mode = AES.MODE_CBC
encryptor = AES.new(key, mode,IV=IV)
text = 'hello'
ciphertext = encryptor.encrypt(text)

 But I am getting the following error:

Traceback (most recent call last):

  File "F:/Python Scripts/sample.py", line 8, in <module>

    ciphertext = encryptor.encrypt(text)

  File "F:\Python Scripts\Crosspost\venv\lib\site-packages\Cryptodome\Cipher\_mode_cbc.py", line 178, in encrypt

    c_uint8_ptr(plaintext),

  File "F:\Python Scripts\Crosspost\venv\lib\site-packages\Cryptodome\Util\_raw_api.py", line 145, in c_uint8_ptr

    raise TypeError("Object type %s cannot be passed to C code" % type(data))

TypeError: Object type <class 'str'> cannot be passed to C code

Comments

Hey,

Did you miss to encode the IV!

You can try something like this:

​

key = b'0123456789abcdef'
IV= b'0123456789abcdef'   #need to be encoded too

mode = AES.MODE_CBC

encryptor = AES.new(key, mode,IV=IV)
text = b'hello'
ciphertext = encryptor.encrypt(text)

I hope this will work.

Answer 1

You have to pass byte string as values so try encoding the data values to byte and then pass it. Try this:

​from Cryptodome.Cipher import AES

key = '0123456789abcdef'
IV='0123456789abcdef'
mode = AES.MODE_CBC
encryptor = AES.new(key.encode('utf8'), mode,IV=IV.encode('utf8'))
text = 'hello'
ciphertext = encryptor.encrypt(text)

Hope this will help!

To learn more, go for Python Master course today.

Thank!

Comments

still happen the same error

---

Hey,

Did you check the other answer given above? I hope that might help.

---

Python3 has package named pycryptodome which causes this error.just uninstall the package

sudo pip3 uninstall pycryptodome

---

key = '0123456789abcdef'
IV='0123456789abcdef'
mode = AES.MODE_CBC
#encode the key and IV
encryptor = AES.new(key.encode('utf-8'), mode,IV=IV.encode('utf-8'))
# pad the text to 16bytes
text = 'hello'
padded_text = text + "0"*(16-len(text))
#encode the text
ciphertext = encryptor.encrypt(padded_text.encode("utf-8"))
print(ciphertext)