add encryption function

index.py

@@ -1,26 +1,50 @@
 import argparse
-from pathlib import Path
-
-def encrypt(file):
-    sal = 'hello encryption'
-    return sal
+from Cryptodome.Cipher import AES
+from Cryptodome.Random import get_random_bytes
 
 
-def decrypt(file):
-    greet = 'hello decryption'
+def encrypt(text, key):
+    # make encryptor
+    encryptor = AES.new(key, AES.MODE_CFB)
+
+    # takes the data and returns ciphertext
+    cipher_text = encryptor.encrypt(text)
+
+    # now to write the ciphertext to the file
+    encrypted_file = open("encrypted_file.txt", "wb")
+    encrypted_file.write(cipher_text)
+    encrypted_file.close()
+
+    # return the cipher_text to show users
+    return cipher_text
+
+
+def decrypt():
+    greet = '\nhello decryption'
     return greet
 
 
 def main():
+    # get arguments from command line
     parser = argparse.ArgumentParser()
     parser.add_argument('-f', '--file', type=open)
-    parser.add_argument('modality', choices=['encrypt', 'decrypt'])
     args = parser.parse_args()
 
-    if args.modality == 'encrypt':
-        print(encrypt(args.file))
-    elif args.modality == 'decrypt':
-        print(decrypt(args.file))
+    # make random 32B long key
+    key = get_random_bytes(32)
+
+    # read the text file in and make it a string with no line breaks
+    text = args.file.read().replace('\n', '')
+
+    # encrypt the file
+    encrypted_text = encrypt(str.encode(text), key)
+
+    # print encrypted text
+    print("Encrypted file created. Contents:")
+    print(encrypted_text)
+
+    print(decrypt())
+
 
 if __name__ == '__main__':
     main()