aes_cbc_mac()

int aes_cbc_mac	(	aes_ctx	ctx,
		const unsigned char *	plaintext,
		size_t	plaintext_len,
		unsigned char	mac[AES_BLOCK_SIZE]
	)

Calculate CBC-MAC (Cipher Block Chaining Message Authentication Code).

Parameters

ctx	AES context from aes_create_ctx()
plaintext	Input data
plaintext_len	Length in bytes (must be multiple of AES_BLOCK_SIZE)
mac	Input: IV (16 bytes), Output: MAC (16 bytes)

Returns

AES_OK on success, AES_ERR_* on error

Note

mac is both input (IV) and output (MAC result)