Feat: Add decryption support to CLI version

Author: Chaitanya6Nli

Secure_Password_Manager/cli/decrypt_passwords_cli.py

@@ -0,0 +1,63 @@
+from cryptography import fernet
+import os
+
+KEY_FILE = "secret.key"
+PASSWORD_FILE = "saved_passwords.txt"
+
+# STEP 1: Load the encryption key
+def load_key():
+    if not os.path.exists(KEY_FILE):
+        print("❌ Encryption key not found. Cannot decrypt passwords.")
+        return None
+    with open(KEY_FILE, "rb") as f:
+        return f.read()
+    
+# STEP 2: Decrypt the passwords
+def decrypt_password(encrypted_text, fernet_cipher_suite): # Renamed parameter for clarity
+    try:
+        return fernet_cipher_suite.decrypt(encrypted_text.encode()).decode()
+    except Exception:
+        return "[Decryption Failed]"
+    
+# STEP 3: Read and decrypt all entries
+def view_passwords():
+    if not os.path.exists(PASSWORD_FILE):
+        print("❌ No saved passwords found")
+        return
+    
+    key = load_key()
+    if not key:
+        return
+    
+    # Fernet = fernet(key) # Original line causing TypeError
+    active_fernet_cipher = fernet.Fernet(key) # Correctly instantiate Fernet class from the module
+
+    print("🔐 Saved Encrypted Passwords\n" + "=" * 40)
+    with open(PASSWORD_FILE, "r") as file:
+        lines = file.readlines()
+
+        current_block = {}
+
+        for line in lines:
+            line = line.strip()
+
+            if line.startswith("[") and "]" in line:
+                current_block["timestamp"] = line.strip("[]")
+            elif line.startswith("Label:"):
+                current_block["label"] = line.split("Label:")[1].strip()
+            elif line.startswith("Encrypted Password:"):
+                current_block["encrypted"] = line.split("Encrypted Password:")[1].strip()
+            elif line.startswith("Included -"):
+                current_block["options"] = line.split("Included -")[1].strip()
+            elif line.startswith("-" * 10):
+             # print everything together
+                print(f"\n📅 Date/Time: {current_block.get('timestamp', '[Unknown]')}")
+                print(f"🏷️  Label: {current_block.get('label', '[None]')}")
+                print(f"🔓 Password: {decrypt_password(current_block.get('encrypted', ''), active_fernet_cipher)}") # Pass the Fernet instance
+                print(f"⚙️  Options: {current_block.get('options', '[Not specified]')}")
+                print("-" * 40)
+                current_block = {}  # Reset for next block
+
+# STEP 4: Entry point
+if __name__ == '__main__':
+    view_passwords()