1- # Basic Fernet
1+ # Enhanced Fernet Encryption Example
22
3- # msg = "I am going to encrypt this sentence using Fernet"
4- msg = "D$bd1@k3"
5- 6- from cryptography import fernet
73from cryptography .fernet import Fernet
84
9- # first generate key
10- eKey = Fernet .generate_key ()
11- print ("\n Key is : " + eKey .decode ())
12- # print("\nType of key is .. " + str(type(eKey)))
13- print ("\n Key is : " + str (len (eKey .decode ())))
5+ def generate_key ():
6+ """Generate and return a Fernet key."""
7+ return Fernet .generate_key ()
8+ 9+ def save_key (key , filename ):
10+ """Save the key to a file."""
11+ with open (filename , 'wb' ) as file :
12+ file .write (key )
13+ 14+ def load_key (filename ):
15+ """Load the key from a file."""
16+ with open (filename , 'rb' ) as file :
17+ return file .read ()
18+ 19+ def encrypt_message (message , key ):
20+ """Encrypt a message using the provided key."""
21+ f = Fernet (key )
22+ return f .encrypt (message .encode ())
23+ 24+ def decrypt_message (token , key ):
25+ """Decrypt a token using the provided key."""
26+ f = Fernet (key )
27+ return f .decrypt (token ).decode ()
28+ 29+ if __name__ == "__main__" :
30+ msg = "D$bd1@k3"
31+ key_file = "fernet.key"
32+ 33+ # Generate and save key
34+ key = generate_key ()
35+ print ("\n Generated Key:" , key .decode ())
36+ save_key (key , key_file )
37+ print ("Key saved to" , key_file )
1438
15- # create a class instance object
16- f1 = Fernet (eKey )
39+ # Load key (simulating a new session)
40+ loaded_key = load_key (key_file )
41+ print ("Loaded Key:" , loaded_key .decode ())
1742
18- eMsg = f1 .encrypt (msg .encode ()) # f1 instance can encrypt only bytes
19- print ("\n Encrypted message is - " + eMsg .decode ())
20- print ("\n Encrypted message is -" + str (len (eMsg )))
43+ # Encrypt message
44+ try :
45+ encrypted = encrypt_message (msg , loaded_key )
46+ print ("\n Encrypted Message:" , encrypted .decode ())
47+ print ("Encrypted message length:" , len (encrypted ))
48+ except Exception as e :
49+ print ("Encryption error:" , e )
2150
22- # decrypt with same instance
23- dMsg = f1 .decrypt (eMsg ).decode ()
24- print ("\n Decrypted Message - " + dMsg )
51+ # Decrypt message
52+ try :
53+ decrypted = decrypt_message (encrypted , loaded_key )
54+ print ("\n Decrypted Message:" , decrypted )
55+ except Exception as e :
56+ print ("Decryption error:" , e )
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