/usr/include/polarssl/sha512.h is in libpolarssl-dev 1.3.4-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* \file sha512.h
*
* \brief SHA-384 and SHA-512 cryptographic hash function
*
* Copyright (C) 2006-2013, Brainspark B.V.
*
* This file is part of PolarSSL (http://www.polarssl.org)
* Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
*
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef POLARSSL_SHA512_H
#define POLARSSL_SHA512_H
#include "config.h"
#include <string.h>
#if defined(_MSC_VER) || defined(__WATCOMC__)
#define UL64(x) x##ui64
typedef unsigned __int64 uint64_t;
#else
#include <inttypes.h>
#define UL64(x) x##ULL
#endif
#define POLARSSL_ERR_SHA512_FILE_IO_ERROR -0x007A /**< Read/write error in file. */
#if !defined(POLARSSL_SHA512_ALT)
// Regular implementation
//
#ifdef __cplusplus
extern "C" {
#endif
/**
* \brief SHA-512 context structure
*/
typedef struct
{
uint64_t total[2]; /*!< number of bytes processed */
uint64_t state[8]; /*!< intermediate digest state */
unsigned char buffer[128]; /*!< data block being processed */
unsigned char ipad[128]; /*!< HMAC: inner padding */
unsigned char opad[128]; /*!< HMAC: outer padding */
int is384; /*!< 0 => SHA-512, else SHA-384 */
}
sha512_context;
/**
* \brief SHA-512 context setup
*
* \param ctx context to be initialized
* \param is384 0 = use SHA512, 1 = use SHA384
*/
void sha512_starts( sha512_context *ctx, int is384 );
/**
* \brief SHA-512 process buffer
*
* \param ctx SHA-512 context
* \param input buffer holding the data
* \param ilen length of the input data
*/
void sha512_update( sha512_context *ctx, const unsigned char *input, size_t ilen );
/**
* \brief SHA-512 final digest
*
* \param ctx SHA-512 context
* \param output SHA-384/512 checksum result
*/
void sha512_finish( sha512_context *ctx, unsigned char output[64] );
#ifdef __cplusplus
}
#endif
#else /* POLARSSL_SHA512_ALT */
#include "sha512_alt.h"
#endif /* POLARSSL_SHA512_ALT */
#ifdef __cplusplus
extern "C" {
#endif
/**
* \brief Output = SHA-512( input buffer )
*
* \param input buffer holding the data
* \param ilen length of the input data
* \param output SHA-384/512 checksum result
* \param is384 0 = use SHA512, 1 = use SHA384
*/
void sha512( const unsigned char *input, size_t ilen,
unsigned char output[64], int is384 );
/**
* \brief Output = SHA-512( file contents )
*
* \param path input file name
* \param output SHA-384/512 checksum result
* \param is384 0 = use SHA512, 1 = use SHA384
*
* \return 0 if successful, or POLARSSL_ERR_SHA512_FILE_IO_ERROR
*/
int sha512_file( const char *path, unsigned char output[64], int is384 );
/**
* \brief SHA-512 HMAC context setup
*
* \param ctx HMAC context to be initialized
* \param is384 0 = use SHA512, 1 = use SHA384
* \param key HMAC secret key
* \param keylen length of the HMAC key
*/
void sha512_hmac_starts( sha512_context *ctx, const unsigned char *key,
size_t keylen, int is384 );
/**
* \brief SHA-512 HMAC process buffer
*
* \param ctx HMAC context
* \param input buffer holding the data
* \param ilen length of the input data
*/
void sha512_hmac_update( sha512_context *ctx, const unsigned char *input, size_t ilen );
/**
* \brief SHA-512 HMAC final digest
*
* \param ctx HMAC context
* \param output SHA-384/512 HMAC checksum result
*/
void sha512_hmac_finish( sha512_context *ctx, unsigned char output[64] );
/**
* \brief SHA-512 HMAC context reset
*
* \param ctx HMAC context to be reset
*/
void sha512_hmac_reset( sha512_context *ctx );
/**
* \brief Output = HMAC-SHA-512( hmac key, input buffer )
*
* \param key HMAC secret key
* \param keylen length of the HMAC key
* \param input buffer holding the data
* \param ilen length of the input data
* \param output HMAC-SHA-384/512 result
* \param is384 0 = use SHA512, 1 = use SHA384
*/
void sha512_hmac( const unsigned char *key, size_t keylen,
const unsigned char *input, size_t ilen,
unsigned char output[64], int is384 );
/**
* \brief Checkup routine
*
* \return 0 if successful, or 1 if the test failed
*/
int sha512_self_test( int verbose );
/* Internal use */
void sha512_process( sha512_context *ctx, const unsigned char data[128] );
#ifdef __cplusplus
}
#endif
#endif /* sha512.h */
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