Task $2$: Encrypting with AES$128-$OFB

Problem Statement: You need to encrypt a string using AES$128$ in Output Feedback $($OFB$)$ mode.

Your Specific Inputs:

String to Encrypt: "Salam Alaikom wa Rahmat Allah wa Barakatoh, $437102453"$

Key: $"8$aec$9$ec$018$cbb$948"$

IV $($Initialization Vector$)$: $"3078$f$2270$c$8669$ac$"$

Your Student ID: $437102453$

Python Code Snippet:from Crypto.Cipher import AES

import hashlib

def encrypt$\_$aes$\_$ofb$($input$\_$str$,$ key, iv$)$:

cipher $=$ AES.new$($key$,$ AES.MODE$\_$OFB, iv$)$

ciphertext $=$ cipher.encrypt$($input$\_$str$.$encode$(\text{'}$utf$-8\text{'}))$

return ciphertext

def get$\_$sha$1\_$hash$($data$)$:

return hashlib.sha$1($data$).$hexdigest$()$

if $\_\_$name$\_\_=="\_\_$main$\_\_"$:

key $=$ b$\text{'}\text{'}$

iv $=$ b$\text{'}\text{'}$

input$\_$string $=""$

encrypted$\_$data $=$ encrypt$\_$aes$\_$ofb$($input$\_$string, key, iv$)$

print$("$SHA$1$ Hash of Encrypted Output:", get$\_$sha$1\_$hash$($encrypted$\_$data$))$

Expected Output: You should provide the SHA$1$ hash of the encrypted output, ensuring your code can encrypt any string using the same key and IV to achieve full score.