#pycryptodome
from Crypto.Cipher import AES

key = bytearray.fromhex('11111111111111111111111111111111')
iv = bytearray.fromhex('4D4554000000000100000000')
aad = bytearray.fromhex('3033333333333333333333333333333333')
#TSecurity.AuthenticationEncryption + 16 * 0x33

cipher = AES.new(key, AES.MODE_GCM, nonce=iv)

ciphertext = bytearray.fromhex('b662a493a5dfdbccc1dc832271bae416945f2e0474d102d2c7941fcd50c678534083e5d1520ae04c3038a281d176b6b2a1ce6e15fe861f4689b7fe7909f309908a40f843e9ceff7675f00b0e217b7620')

och = ciphertext.hex()
print(f'Original ciphertext is {och}\n')
plaintext = cipher.decrypt(ciphertext)
plaintext = plaintext[:-12]
plth = plaintext.hex()
print(f'Plaintext is {plth}\n')

cipher2 = AES.new(key, AES.MODE_GCM, nonce=iv, mac_len=16)
cipher2.update(aad)
genciphertext, tag = cipher2.encrypt_and_digest(plaintext)

tagh = tag.hex()
gcph = genciphertext.hex()
print(f'Generated ciphertext is {gcph} with tag {tagh}\n')

#cipher3 = AES.new(key, AES.MODE_GCM, nonce=iv, mac_len=12)
#cipher3.update(aad)
#data = cipher3.decrypt_and_verify(ciphertext[:-12], ciphertext[-12:]);

#datah = data.hex()
#print(f'Plaintext is {datah}\n')