sha256.h

//
//  SHA-256 implementation, Mark 2
//
//  Copyright (c) 2010,2014 Literatecode, http://www.literatecode.com
//  Copyright (c) 2022 Ilia Levin (ilia@levin.sg)
//
//  Permission to use, copy, modify, and distribute this software for any
//  purpose with or without fee is hereby granted, provided that the above
//  copyright notice and this permission notice appear in all copies.
//
//  THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
//  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
//  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
//  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
//  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
//  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
//  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
//

#ifndef SHA256_H_
#define SHA256_H_

#include <stddef.h>
#include <stdint.h>

#define SHA256_SIZE_BYTES    (32)

#ifdef __cplusplus
extern "C"
{
#endif

typedef struct {
    uint8_t  buf[64];
    uint32_t hash[8];
    uint32_t bits[2];
    uint32_t len;
    uint32_t rfu__;
    uint32_t W[64];
} sha256_context;

void sha256_init(sha256_context *ctx);
void sha256_hash(sha256_context *ctx, const void *data, size_t len);
void sha256_done(sha256_context *ctx, uint8_t *hash);

void sha256(const void *data, size_t len, uint8_t *hash);

#ifdef __cplusplus
}
#endif

#endif