lc_ascon_keccak.h

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/*
 * Copyright (C) 2024 - 2025, Stephan Mueller <smueller@chronox.de>
 *
 * License: see LICENSE file in root directory
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ALL OF
 * WHICH ARE HEREBY DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
 * USE OF THIS SOFTWARE, EVEN IF NOT ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGE.
 */
 
#ifndef LC_ASCON_KECCAK_H
#define LC_ASCON_KECCAK_H
 
#include "lc_ascon_aead.h"
#include "lc_sha3.h"
 
#ifdef __cplusplus
extern "C" {
#endif

#define LC_AK_STATE_SIZE (LC_SHA3_STATE_SIZE + LC_ASCON_ALIGNMENT)
#define LC_AK_CTX_SIZE(x)                                                      \
        (sizeof(struct lc_aead) + sizeof(struct lc_ascon_cryptor) +            \
         LC_AK_STATE_SIZE)
 
/* Ascon-Keccak-based AEAD-algorithm */
extern const struct lc_aead *lc_ascon_keccak_aead;

int lc_ak_alloc(const struct lc_hash *hash, struct lc_aead_ctx **ctx);

int lc_ak_alloc_taglen(const struct lc_hash *hash, uint8_t taglen,
                       struct lc_aead_ctx **ctx);

#define LC_AK_CTX_ON_STACK(name, hash)                                              \
        _Pragma("GCC diagnostic push")                                              \
                _Pragma("GCC diagnostic ignored \"-Wvla\"") _Pragma(                \
                        "GCC diagnostic ignored \"-Wdeclaration-after-statement\"") \
                        LC_ALIGNED_BUFFER(name##_ctx_buf,                           \
                                          LC_AK_CTX_SIZE(hash),                     \
                                          LC_ASCON_ALIGNMENT);                      \
        struct lc_aead_ctx *name = (struct lc_aead_ctx *)name##_ctx_buf;            \
        LC_ASCON_SET_CTX(name, hash, lc_ascon_keccak_aead);                         \
        struct lc_ascon_cryptor *__name_ascon_crypto = name->aead_state;            \
        __name_ascon_crypto->statesize = LC_SHA3_STATE_SIZE;                        \
        __name_ascon_crypto->taglen = 16;                                           \
        _Pragma("GCC diagnostic pop")

#define LC_AK_CTX_ON_STACK_TAGLEN(name, hash, tagsize)                              \
        _Pragma("GCC diagnostic push")                                              \
                _Pragma("GCC diagnostic ignored \"-Wvla\"") _Pragma(                \
                        "GCC diagnostic ignored \"-Wdeclaration-after-statement\"") \
                        LC_ALIGNED_BUFFER(name##_ctx_buf,                           \
                                          LC_AK_CTX_SIZE(hash),                     \
                                          LC_ASCON_ALIGNMENT);                      \
        struct lc_aead_ctx *name = (struct lc_aead_ctx *)name##_ctx_buf;            \
        LC_ASCON_SET_CTX(name, hash, lc_ascon_keccak_aead);                         \
        struct lc_ascon_cryptor *__name_ascon_crypto = name->aead_state;            \
        __name_ascon_crypto->statesize = LC_SHA3_STATE_SIZE;                        \
        __name_ascon_crypto->taglen = tagsize;                                      \
        _Pragma("GCC diagnostic pop")
 
#ifdef __cplusplus
}
#endif
 
#endif /* LC_ASCON_KECCAK_H */