/*
 * Copyright 2007 The Android Open Source Project
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * 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.
 *     * Neither the name of Google Inc. 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 Google Inc. ``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 Google Inc. 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 CONSTRAINEDCRYPTO_HASH_INTERNAL_H_
#define CONSTRAINEDCRYPTO_HASH_INTERNAL_H_

#include <stdint.h>

#ifdef __cplusplus
extern "C" {
#endif  // __cplusplus

struct HASH_CTX;  // forward decl

typedef struct HASH_VTAB {
  void (* const init)(struct HASH_CTX*);
  void (* const update)(struct HASH_CTX*, const void*, int);
  const uint8_t* (* const final)(struct HASH_CTX*);
  const uint8_t* (* const hash)(const void*, int, uint8_t*);
  int size;
} HASH_VTAB;

typedef struct HASH_CTX {
  const HASH_VTAB * f;
  uint64_t count;
  uint8_t buf[64];
  uint32_t state[8];  // upto SHA2
} HASH_CTX;

#define HASH_init(ctx) (ctx)->f->init(ctx)
#define HASH_update(ctx, data, len) (ctx)->f->update(ctx, data, len)
#define HASH_final(ctx) (ctx)->f->final(ctx)
#define HASH_hash(data, len, digest) (ctx)->f->hash(data, len, digest)
#define HASH_size(ctx) (ctx)->f->size

#ifdef __cplusplus
}
#endif  // __cplusplus

#endif  // CONSTRAINEDCRYPTO_HASH_INTERNAL_H_