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/*
* Copyright (c) 2023-2025 Ian Marco Moffett and the Osmora Team.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Hyra nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS 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 ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _CRYPTO_SHA256_H
#define _CRYPTO_SHA256_H 1
#include <stddef.h>
#include <stdint.h>
#define SHA256_HEX_SIZE (64 + 1)
#define SHA256_BYTES_SIZE 32
/*
* Compute the SHA-256 checksum of a memory region given a pointer and
* the size of that memory region.
* The output is a hexadecimal string of 65 characters.
* The last character will be the null-character.
*/
void sha256_hex(const void *src, size_t n_bytes, char *dst_hex65);
void sha256_bytes(const void *src, size_t n_bytes, void *dst_bytes32);
typedef struct sha256 {
uint32_t state[8];
uint8_t buffer[64];
uint64_t n_bits;
uint8_t buffer_counter;
} sha256;
/* Functions to compute streaming SHA-256 checksums. */
void sha256_init(struct sha256 *sha);
void sha256_append(struct sha256 *sha, const void *data, size_t n_bytes);
void sha256_finalize_hex(struct sha256 *sha, char *dst_hex65);
void sha256_finalize_bytes(struct sha256 *sha, void *dst_bytes32);
#endif /* !_CRYPTO_SHA256_H */
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