[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

Author: pre-commit-ci[bot]

ciphers/rc4.py

@@ -140,6 +140,7 @@ def decrypt(ciphertext: bytes, key: bytes) -> bytes:
     # Check for doctests
     if len(sys.argv) > 1 and sys.argv[1] == "--test":
         import doctest
+
         doctest.testmod()
         sys.exit(0)
 
@@ -159,7 +160,9 @@ def decrypt(ciphertext: bytes, key: bytes) -> bytes:
             if not key_str:
                 print("Key cannot be empty!")
                 continue
-            encrypted_bytes = encrypt(plain_str.encode("utf-8"), key_str.encode("utf-8"))
+            encrypted_bytes = encrypt(
+                plain_str.encode("utf-8"), key_str.encode("utf-8")
+            )
             print(f"Ciphertext (Hex): {encrypted_bytes.hex()}")
         elif choice == "2":
             hex_str = input("Enter hex ciphertext to decrypt: ")
@@ -170,7 +173,9 @@ def decrypt(ciphertext: bytes, key: bytes) -> bytes:
             try:
                 cipher_bytes = bytes.fromhex(hex_str)
                 decrypted_bytes = decrypt(cipher_bytes, key_str.encode("utf-8"))
-                print(f"Decrypted text: {decrypted_bytes.decode('utf-8', errors='replace')}")
+                print(
+                    f"Decrypted text: {decrypted_bytes.decode('utf-8', errors='replace')}"
+                )
             except ValueError as e:
                 print(f"Invalid input: {e}")
         else: