lc_ascon_hash.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_HASH_H
#define LC_ASCON_HASH_H
 
#include "lc_hash.h"
 
#ifdef __cplusplus
extern "C" {
#endif

#define LC_ASCON_HASH_STATE_WORDS 5
#define LC_ASCON_HASH_STATE_SIZE (LC_ASCON_HASH_STATE_WORDS * sizeof(uint64_t))
 
#define LC_ASCON_HASH_RATE (64 / 8)
#define LC_ASCON_HASH_RATE_WORDS (LC_ASCON_HASH_RATE / sizeof(uint64_t))
 
#define LC_ASCON_HASH_DIGESTSIZE_BITS 256
#define LC_ASCON_HASH_DIGESTSIZE (LC_ASCON_HASH_DIGESTSIZE_BITS >> 3)
 
/* Macro set during leancrypto compile time for target platform */
#undef LC_DEF_ASCON_AVX512
 
struct lc_ascon_hash {
        uint64_t state[LC_ASCON_HASH_STATE_WORDS
#ifdef LC_DEF_ASCON_AVX512
        + 3
#endif
        ];
        size_t msg_len;
        size_t digestsize;
        uint8_t roundb;
        uint8_t offset;
        uint8_t squeeze_more : 1;
};
 
#define LC_ASCON_STATE_SIZE (sizeof(struct lc_ascon_hash))
#define LC_ASCON_CTX_SIZE (sizeof(struct lc_hash) + LC_ASCON_STATE_SIZE)
 
#define LC_ASCON_CTX(name, ascon)                                              \
        LC_HASH_SET_CTX(name, ascon);                                          \
        lc_hash_zero(name)
 
#define LC_ASCON_CTX_ON_STACK(name, ascon)                                          \
        _Pragma("GCC diagnostic push")                                              \
                _Pragma("GCC diagnostic ignored \"-Wvla\"") _Pragma(                \
                        "GCC diagnostic ignored \"-Wdeclaration-after-statement\"") \
                        LC_ALIGNED_BUFFER(name##_ctx_buf, LC_ASCON_CTX_SIZE,        \
                                          LC_HASH_COMMON_ALIGNMENT);                \
        struct lc_hash_ctx *name = (struct lc_hash_ctx *)name##_ctx_buf;            \
        LC_ASCON_CTX(name, ascon);                                                  \
        _Pragma("GCC diagnostic pop")

extern const struct lc_hash *lc_ascon_256;

extern const struct lc_hash *lc_ascon_128a;

extern const struct lc_hash *lc_ascon_xof;

#define LC_ASCON_256_CTX_ON_STACK(name)                                        \
        LC_ASCON_CTX_ON_STACK(name, lc_ascon_256)

#define LC_ASCON_XOF_CTX_ON_STACK(name)                                        \
        LC_ASCON_CTX_ON_STACK(name, lc_ascon_xof)
 
#ifdef __cplusplus
}
#endif
 
#endif /* LC_ASCON_HASH_H */