gascon128.h

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/*
 * Copyright (C) 2020 Southern Storm Software, Pty Ltd.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 */

#ifndef LWCRYPTO_GASCON_H
#define LWCRYPTO_GASCON_H

#include "aead-common.h"

#ifdef __cplusplus
extern "C" {
#endif

#define GASCON128_KEY_SIZE 16

#define GASCON128_NONCE_SIZE 16

#define GASCON128_TAG_SIZE 16

#define GASCON80PQ_KEY_SIZE 20

#define GASCON80PQ_NONCE_SIZE 16

#define GASCON80PQ_TAG_SIZE 16

#define GASCON_HASH_SIZE 32

typedef union
{
    struct {
        unsigned char state[40]; 
        unsigned char count;     
        unsigned char mode;      
    } s;                         
    unsigned long long align;    
} gascon_hash_state_t;

extern aead_cipher_t const gascon128_cipher;

extern aead_cipher_t const gascon128a_cipher;

extern aead_cipher_t const gascon80pq_cipher;

extern aead_hash_algorithm_t const gascon_hash_algorithm;

extern aead_hash_algorithm_t const gascon_xof_algorithm;

int gascon128_aead_encrypt
    (unsigned char *c, unsigned long long *clen,
     const unsigned char *m, unsigned long long mlen,
     const unsigned char *ad, unsigned long long adlen,
     const unsigned char *nsec,
     const unsigned char *npub,
     const unsigned char *k);

int gascon128_aead_decrypt
    (unsigned char *m, unsigned long long *mlen,
     unsigned char *nsec,
     const unsigned char *c, unsigned long long clen,
     const unsigned char *ad, unsigned long long adlen,
     const unsigned char *npub,
     const unsigned char *k);

int gascon128a_aead_encrypt
    (unsigned char *c, unsigned long long *clen,
     const unsigned char *m, unsigned long long mlen,
     const unsigned char *ad, unsigned long long adlen,
     const unsigned char *nsec,
     const unsigned char *npub,
     const unsigned char *k);

int gascon128a_aead_decrypt
    (unsigned char *m, unsigned long long *mlen,
     unsigned char *nsec,
     const unsigned char *c, unsigned long long clen,
     const unsigned char *ad, unsigned long long adlen,
     const unsigned char *npub,
     const unsigned char *k);

int gascon80pq_aead_encrypt
    (unsigned char *c, unsigned long long *clen,
     const unsigned char *m, unsigned long long mlen,
     const unsigned char *ad, unsigned long long adlen,
     const unsigned char *nsec,
     const unsigned char *npub,
     const unsigned char *k);

int gascon80pq_aead_decrypt
    (unsigned char *m, unsigned long long *mlen,
     unsigned char *nsec,
     const unsigned char *c, unsigned long long clen,
     const unsigned char *ad, unsigned long long adlen,
     const unsigned char *npub,
     const unsigned char *k);

int gascon_hash
    (unsigned char *out, const unsigned char *in, unsigned long long inlen);

void gascon_hash_init(gascon_hash_state_t *state);

void gascon_hash_update
    (gascon_hash_state_t *state, const unsigned char *in,
     unsigned long long inlen);

void gascon_hash_finalize
    (gascon_hash_state_t *state, unsigned char *out);

int gascon_xof
    (unsigned char *out, const unsigned char *in, unsigned long long inlen);

void gascon_xof_init(gascon_hash_state_t *state);

void gascon_xof_absorb
    (gascon_hash_state_t *state, const unsigned char *in,
     unsigned long long inlen);

void gascon_xof_squeeze
    (gascon_hash_state_t *state, unsigned char *out, unsigned long long outlen);

#ifdef __cplusplus
}
#endif

#endif