how to create and validate access token using crypto library in python

To create an access token using cryptography library in Python, we can use the JSON Web Tokens (JWT) with the HMAC SHA-256 algorithm. Here's an example:


main.py
import jwt
from cryptography.hazmat.primitives import hashes
from cryptography.hazmat.primitives.kdf.pbkdf2 import PBKDF2HMAC
from cryptography.hazmat.backends import default_backend

# define a secret key and salt for encryption
secret_key = b'mysecretkey'
salt = b'mysalt'

# create a key derivation function using PBKDF2HMAC
# to derive a more secure encryption key
kdf = PBKDF2HMAC(
    algorithm=hashes.SHA256(),
    length=32,
    salt=salt,
    iterations=100000,
    backend=default_backend()
)
key = kdf.derive(secret_key)

# create a payload with the necessary information
payload = {
    'username': 'myusername',
    'exp': datetime.utcnow() + timedelta(minutes=30)  # token expiration time
}

# create the access token with JWT and the SHA-256 algorithm
token = jwt.encode(payload, key, algorithm='HS256')

# to validate the token, decode it using the same key
decoded_payload = jwt.decode(token, key, algorithms=['HS256'])
print(decoded_payload)
960 chars
33 lines

In this example, we first define a secret key and a salt for encryption. We then create a key derivation function using PBKDF2HMAC to derive a more secure encryption key.

Next, we define a payload with the necessary information such as the username and expiration time. We create the access token using the jwt.encode() method with the HS256 algorithm and the derived encryption key.

To validate the token, we can use the jwt.decode() method with the same key and algorithm. This will decode the token and return the original payload. If the token has been tampered with or is otherwise invalid, an exception will be raised.

similar python code snippets

buy crypto in python

generate access token using crypto library in python

parse jwt tokens in python

jwt token in python

find urls in a string in python

send an email in python

open a file in python

throw and catch errors in python

connect to secrets manager in python

how to create a class in python

related categories