Question: Finish out the code of the simple encryption plus hash system and add a decryption operation. The decryption operation should, upon finalization, recompute the hash

Finish out the code of the simple encryption plus hash system and add a decryption operation. The decryption operation should, upon finalization, recompute the hash of the ciphertext and compare it to the hash that was sent over. If the hashes dont match, it should raise an exception. Be careful! The MAC is not encrypted and should not be decrypted! If you dont think carefully about this, you might decrypt data that doesnt exist!

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