crypto_aead/lilliputaei128v1/ref/tweakey.h


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#pragma once

#include <stddef.h>
#include <stdio.h>              /* debug */
#include <stdint.h>


#define TWEAK_LENGTH_BITS         192
#define KEY_LENGTH_BITS           128
#define ROUND_TWEAKEY_LENGTH_BITS 64

#define TWEAK_BYTES         (TWEAK_LENGTH_BITS/8)
#define KEY_BYTES           (KEY_LENGTH_BITS/8)
#define ROUND_TWEAKEY_BYTES (ROUND_TWEAKEY_LENGTH_BITS/8)


struct tweakey_state
{
    FILE* debug;
    uint8_t TK[TWEAK_BYTES+KEY_BYTES];
};

typedef struct tweakey_state tweakey_state;


void tweakey_state_init(
    tweakey_state *TK,
    const uint8_t key[KEY_BYTES],
    const uint8_t tweak[TWEAK_BYTES],
    FILE* debug
);

void tweakey_state_extract(
    const tweakey_state *TK,
    uint8_t round_tweakey[ROUND_TWEAKEY_BYTES], /* output */
    uint8_t i                                   /* round constant */
);

void tweakey_state_update(tweakey_state *TK);