[英]How to encrypt and decrypt with variables in Python
My goal is to write a code in Python that do the following: 1.Generate a public key.我的目标是用 Python 编写执行以下操作的代码: 1.生成公钥。 2. Hash the public key. 2. 散列公钥。 3. Generate a random string. 3. 生成随机字符串。 4. Encrypt & decrypt the random string with the hashed public key. 4. 用散列的公钥加密和解密随机字符串。
This is the code I written:这是我写的代码:
from Crypto.PublicKey import RSA
import random
import string
import hashlib
import base64
from cryptography.fernet import Fernet
from cryptography.hazmat.backends import default_backend
from cryptography.hazmat.primitives import hashes
from cryptography.hazmat.primitives.kdf.pbkdf2 import PBKDF2HMAC
def encrypt(plaintext, password):
f = Fernet(base64.urlsafe_b64encode(
PBKDF2HMAC(algorithm=hashes.SHA256(), length=32, salt=b'abcd', iterations=1000,
backend=default_backend()).derive(password.encode())))
return f.encrypt(plaintext.encode()).decode()
def decrypt(ciphertext, password):
f = Fernet(base64.urlsafe_b64encode(
PBKDF2HMAC(algorithm=hashes.SHA256(), length=32, salt=b'abcd', iterations=1000,
backend=default_backend()).derive(password.encode())))
return f.decrypt(ciphertext.encode()).decode()
def randomString(strlength = 16): #Random code
letters = string.ascii_letters
return ''.join(random.choice(letters) for i in range(strlength))
key = RSA.generate(2048) # Private key creation
code = 'nooneknows'
privatekey = key.exportKey(passphrase=code, pkcs=8)
publickey = key.publickey().exportKey()
result = hashlib.md5(publickey) #Hashing the Publickey
publickey = result.digest()
Nonce=randomString() # Creating Nonce
encrypt((str(Nonce)), password=(str(publickey))) # Encrypting nonce with hashed pub.key
decrypt((str(encrypt)), password=(str(publickey)))
print("This is the decrption", encrypt)
print("This is the decrption", decrypt)
When I run it, I get the error:当我运行它时,我收到错误:
D:\Anaconda3\python.exe C:/Users/AVIV/.PyCharmCE2019.1/config/scratches/test.py
Traceback (most recent call last):
File "D:\Anaconda3\lib\site-packages\cryptography\fernet.py", line 87, in _get_unverified_token_data
data = base64.urlsafe_b64decode(token)
File "D:\Anaconda3\lib\base64.py", line 133, in urlsafe_b64decode
return b64decode(s)
File "D:\Anaconda3\lib\base64.py", line 87, in b64decode
return binascii.a2b_base64(s)
binascii.Error: Incorrect padding
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "C:/Users/AVIV/.PyCharmCE2019.1/config/scratches/test.py", line 39, in <module>
decrypt((str(encrypt)), password=(str(publickey)))
File "C:/Users/AVIV/.PyCharmCE2019.1/config/scratches/test.py", line 21, in decrypt
return f.decrypt(ciphertext.encode()).decode()
File "D:\Anaconda3\lib\site-packages\cryptography\fernet.py", line 74, in decrypt
timestamp, data = Fernet._get_unverified_token_data(token)
File "D:\Anaconda3\lib\site-packages\cryptography\fernet.py", line 89, in _get_unverified_token_data
raise InvalidToken
cryptography.fernet.InvalidToken
Is there a way to solve this error?有没有办法解决这个错误? My guess, is that the issue is with the decoding and encoding to/from bytes.我的猜测是,问题在于字节的解码和编码。 I tried to decode/encode it many times, but always ended up with an error.我多次尝试对其进行解码/编码,但总是以错误告终。 Also, I guess that it has an issue with the padding, but I couldn't figured how to solve it.另外,我猜它的填充有问题,但我不知道如何解决。 I was thinking, maybe the Fernet encryption isn't the right fit for the goals of my project, maybe I should use other encryption/library?我在想,也许 Fernet 加密不适合我的项目目标,也许我应该使用其他加密/库?
You are not actually assigning encrypt to a variable, you are sending in an encrypt function as the argument for the decrypt function.您实际上并没有将 encrypt 分配给变量,而是将 encrypt 函数作为解密函数的参数发送。 Make this change this at the end of your code:在代码末尾进行更改:
encrypted = encrypt((str(Nonce)), password=(str(publickey))) # Encrypting nonce with hashed pub.key
decrypted = decrypt((str(encrypted)), password=(str(publickey)))
print("This is the encrypted", encrypted)
print("This is the decrypted", decrypted)
The output for decrypted
will be the Nonce that you encrypted. decrypted
的输出将是您加密的 Nonce。
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