AES_KEY_BYTES
u8 scratch[AES_KEY_BYTES + AES_BLOCK_SIZE];
auth->tpm_nonce, AES_KEY_BYTES + AES_BLOCK_SIZE,
aes_prepareenckey(&auth->aes_key, auth->scratch, AES_KEY_BYTES);
auth->scratch + AES_KEY_BYTES);
#define AES_KEY_BITS (AES_KEY_BYTES*8)
auth->our_nonce, AES_KEY_BYTES + AES_BLOCK_SIZE,
aes_prepareenckey(&auth->aes_key, auth->scratch, AES_KEY_BYTES);
auth->scratch + AES_KEY_BYTES);