Fix bug

cryptography/run

@@ -32,10 +32,9 @@ def show_b64(name, value):
 def show_hex_block(name, value, byte_block_size=16):
     value_to_show = ""
 
-    for i in range(len(value)):
-        value_to_show += f"{hex(value[i])[2:]}"
-        if i != 0 and i % byte_block_size == 0:
-            value_to_show += " "
+    for i in range(0, len(value), byte_block_size):
+        value_to_show += f"{value[i:i+byte_block_size].hex()}"
+        value_to_show += " "
     show(f"{name} (hex)", value_to_show)
 
 
@@ -129,13 +128,15 @@ def level5():
     key = get_random_bytes(16)
     cipher = AES.new(key=key, mode=AES.MODE_ECB)
 
+    print(f"{pad(flag, cipher.block_size)}")
     ciphertext = cipher.encrypt(pad(flag, cipher.block_size))
     show_b64("secret ciphertext", ciphertext)
     show_hex_block("secret ciphertext", ciphertext)
 
     while True:
         plaintext_prefix = input_b64("plaintext prefix")
         ciphertext = cipher.encrypt(pad(plaintext_prefix + flag, cipher.block_size))
+        print(f"{pad(plaintext_prefix + flag, cipher.block_size)}")
         show_b64("ciphertext", ciphertext)
         show_hex_block("ciphertext", ciphertext)