include/mincrypt/sha.h

/* sha.h
**
** Copyright 2008, 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,
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** PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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*/

#ifndef _EMBEDDED_SHA_H_
#define _EMBEDDED_SHA_H_

#include <inttypes.h>
#include <endian.h>

#ifdef __cplusplus
extern "C" {
#endif

typedef struct SHA_CTX {
    uint64_t count;
    uint32_t state[5];
#if __BYTE_ORDER == __LITTLE_ENDIAN
    union {
        uint8_t b[64];
        uint32_t w[16];
    } buf;
#else
    uint8_t buf[64];
#endif
} SHA_CTX;

void SHA_init(SHA_CTX* ctx);
void SHA_update(SHA_CTX* ctx, const void* data, int len);
const uint8_t* SHA_final(SHA_CTX* ctx);

/* Convenience method. Returns digest parameter value. */
const uint8_t* SHA(const void* data, int len, uint8_t* digest);

#define SHA_DIGEST_SIZE 20

#ifdef __cplusplus
}
#endif

#endif