ascon-permutation.h

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/*
 * Copyright (C) 2021 Southern Storm Software, Pty Ltd.
 *
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#ifndef LWCRYPTO_ASCON_PERMUTATION_H
#define LWCRYPTO_ASCON_PERMUTATION_H

#include <stdint.h>

#ifdef __cplusplus
extern "C" {
#endif

#define ASCON_STATE_SIZE 40

#define ASCON_MAX_ROUNDS 12

typedef union
{
    uint64_t S[ASCON_STATE_SIZE / 8];   
    uint32_t W[ASCON_STATE_SIZE / 4];   
    uint8_t B[ASCON_STATE_SIZE];        
} ascon_permutation_state_t;

void ascon_init(ascon_permutation_state_t *state);

void ascon_from_operational(ascon_permutation_state_t *state);

void ascon_to_operational(ascon_permutation_state_t *state);

void ascon_add_byte
    (ascon_permutation_state_t *state, unsigned char data, unsigned offset);

void ascon_add_bytes
    (ascon_permutation_state_t *state, const unsigned char *data,
     unsigned offset, unsigned length);

void ascon_overwrite_bytes
    (ascon_permutation_state_t *state, const unsigned char *data,
     unsigned offset, unsigned length);

void ascon_overwrite_with_zeroes
    (ascon_permutation_state_t *state, unsigned count);

void ascon_permute_n_rounds(ascon_permutation_state_t *state, unsigned rounds);

void ascon_permute_all_rounds(ascon_permutation_state_t *state);

void ascon_extract_bytes
    (const ascon_permutation_state_t *state, unsigned char *data,
     unsigned offset, unsigned length);

void ascon_extract_and_add_bytes
    (const ascon_permutation_state_t *state, const unsigned char *input,
     unsigned char *output, unsigned offset, unsigned length);

void ascon_encrypt_bytes
    (ascon_permutation_state_t *state, const unsigned char *input,
     unsigned char *output, unsigned offset, unsigned length, int padded);

void ascon_decrypt_bytes
    (ascon_permutation_state_t *state, const unsigned char *input,
     unsigned char *output, unsigned offset, unsigned length, int padded);

#ifdef __cplusplus
}
#endif

#endif