hash.h

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/* SPDX-License-Identifier: BSD-2-Clause */
 
/*
 * Copyright (C) 2021 embedded brains GmbH & Co. KG
 *
 * 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.
 *
 * 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 _RTEMS_SCORE_HASH_H
#define _RTEMS_SCORE_HASH_H
 
#include <rtems/score/basedefs.h>
 
#include <sha256.h>
#include <string.h>
 
#ifdef __cplusplus
extern "C" {
#endif
 
#define HASH_CONTROL_STRING_SIZE 45
 
typedef struct {
  char chars[ HASH_CONTROL_STRING_SIZE ];
} Hash_Control;
 
static inline const char *_Hash_Get_string( const Hash_Control *hash )
{
  return &hash->chars[ 0 ];
}
 
typedef struct {
  SHA256_CTX Context;
 
  Hash_Control *hash;
 
  size_t index;
} Hash_Context;
 
static inline void _Hash_Initialize( Hash_Context *context )
{
  SHA256_Init( &context->Context );
}
 
static inline void _Hash_Add_data(
  Hash_Context *context,
  const void   *begin,
  size_t        size
)
{
  SHA256_Update( &context->Context, begin, size );
}
 
static inline void _Hash_Add_string(
  Hash_Context *context,
  const char   *str
)
{
  SHA256_Update( &context->Context, str, strlen( str ) );
}
 
void _Hash_Finalize( Hash_Context *context, Hash_Control *hash );
 
#ifdef __cplusplus
}
#endif
 
#endif /* _RTEMS_SCORE_HASH_H */