code: def decode_aes256_cbc_base64(data, encryption_key):
      
      if not data:
          return b''
      else:
          # LastPass AES-256/CBC/base64 encryted string starts with an "!".
          # Next 24 bytes are the base64 encoded IV for the cipher.
          # Then comes the "|".
          # And the rest is the base64 encoded encrypted payload.
          return decode_aes256(
              'cbc',
              decode_base64(data[1:25]),
              decode_base64(data[26:]),
              encryption_key)
docs: Decrypts base64 encoded AES-256 CBC bytes.