lc_sha256.h

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/*
 * Copyright (C) 2020 - 2024, 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_SHA256_H
#define LC_SHA256_H
 
#include "lc_hash.h"
 
#ifdef __cplusplus
extern "C" {
#endif
 
extern const struct lc_hash *lc_sha256;
 
#define LC_SHA256_SIZE_BLOCK 64
#define LC_SHA256_SIZE_DIGEST 32
 
struct lc_sha256_state {
        uint32_t H[8];
        size_t msg_len;
        uint8_t partial[LC_SHA256_SIZE_BLOCK];
};
 
#define LC_SHA256_STATE_SIZE (sizeof(struct lc_sha256_state))
#define LC_SHA256_CTX_SIZE (sizeof(struct lc_hash) + LC_SHA256_STATE_SIZE)
 
#define LC_SHA256_CTX(name)                                                    \
        LC_HASH_SET_CTX(name, lc_sha256);                                      \
        lc_hash_zero(name)
 
#define LC_SHA256_CTX_ON_STACK(name)                                                \
        _Pragma("GCC diagnostic push")                                              \
                _Pragma("GCC diagnostic ignored \"-Wvla\"") _Pragma(                \
                        "GCC diagnostic ignored \"-Wdeclaration-after-statement\"") \
                        LC_ALIGNED_BUFFER(name##_ctx_buf, LC_SHA256_CTX_SIZE,       \
                                          LC_HASH_COMMON_ALIGNMENT);                \
        struct lc_hash_ctx *name = (struct lc_hash_ctx *)name##_ctx_buf;            \
        LC_SHA256_CTX(name);                                                        \
        _Pragma("GCC diagnostic pop")
 
#ifdef __cplusplus
}
#endif
 
#endif /* LC_SHA256_H */