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/* $Id$ */
/** @file
* IPRT - SHA256 digest creation
*
* @todo Replace this with generic RTCrDigest based implementation. Too much
* stupid code duplication.
*/
/*
* Copyright (C) 2009-2019 Oracle Corporation
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* you can redistribute it and/or modify it under the terms of the GNU
* General Public License (GPL) as published by the Free Software
* Foundation, in version 2 as it comes in the "COPYING" file of the
* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
* VirtualBox OSE distribution, in which case the provisions of the
* CDDL are applicable instead of those of the GPL.
*
* You may elect to license modified versions of this file under the
* terms and conditions of either the GPL or the CDDL or both.
*/
/*********************************************************************************************************************************
* Header Files *
*********************************************************************************************************************************/
#include "internal/iprt.h"
#include <iprt/sha.h>
#include <iprt/alloca.h>
#include <iprt/assert.h>
#include <iprt/errcore.h>
#include <iprt/mem.h>
#include <iprt/string.h>
#include <iprt/file.h>
RTR3DECL(int) RTSha256Digest(void* pvBuf, size_t cbBuf, char **ppszDigest, PFNRTPROGRESS pfnProgressCallback, void *pvUser)
{
/* Validate input */
AssertPtrReturn(pvBuf, VERR_INVALID_POINTER);
AssertPtrReturn(ppszDigest, VERR_INVALID_POINTER);
AssertPtrNullReturn(pfnProgressCallback, VERR_INVALID_PARAMETER);
int rc = VINF_SUCCESS;
*ppszDigest = NULL;
/* Initialize the hash context. */
RTSHA256CONTEXT Ctx;
RTSha256Init(&Ctx);
/* Buffer size for progress callback */
double rdMulti = 100.0 / (cbBuf ? cbBuf : 1);
/* Working buffer */
char *pvTmp = (char*)pvBuf;
/* Process the memory in blocks */
size_t cbReadTotal = 0;
for (;;)
{
size_t cbRead = RT_MIN(cbBuf - cbReadTotal, _1M);
RTSha256Update(&Ctx, pvTmp, cbRead);
cbReadTotal += cbRead;
pvTmp += cbRead;
/* Call the progress callback if one is defined */
if (pfnProgressCallback)
{
rc = pfnProgressCallback((unsigned)(cbReadTotal * rdMulti), pvUser);
if (RT_FAILURE(rc))
break; /* canceled */
}
/* Finished? */
if (cbReadTotal == cbBuf)
break;
}
if (RT_SUCCESS(rc))
{
/* Finally calculate & format the SHA256 sum */
uint8_t abHash[RTSHA256_HASH_SIZE];
RTSha256Final(&Ctx, abHash);
char *pszDigest;
rc = RTStrAllocEx(&pszDigest, RTSHA256_DIGEST_LEN + 1);
if (RT_SUCCESS(rc))
{
rc = RTSha256ToString(abHash, pszDigest, RTSHA256_DIGEST_LEN + 1);
if (RT_SUCCESS(rc))
*ppszDigest = pszDigest;
else
RTStrFree(pszDigest);
}
}
return rc;
}
RTR3DECL(int) RTSha256DigestFromFile(const char *pszFile, char **ppszDigest, PFNRTPROGRESS pfnProgressCallback, void *pvUser)
{
/* Validate input */
AssertPtrReturn(pszFile, VERR_INVALID_POINTER);
AssertPtrReturn(ppszDigest, VERR_INVALID_POINTER);
AssertPtrNullReturn(pfnProgressCallback, VERR_INVALID_PARAMETER);
*ppszDigest = NULL;
/* Initialize the hash context. */
RTSHA256CONTEXT Ctx;
RTSha256Init(&Ctx);
/* Open the file to calculate a SHA256 sum of */
RTFILE hFile;
int rc = RTFileOpen(&hFile, pszFile, RTFILE_O_OPEN | RTFILE_O_READ | RTFILE_O_DENY_WRITE);
if (RT_FAILURE(rc))
return rc;
/* Fetch the file size. Only needed if there is a progress callback. */
double rdMulti = 0;
if (pfnProgressCallback)
{
uint64_t cbFile;
rc = RTFileGetSize(hFile, &cbFile);
if (RT_FAILURE(rc))
{
RTFileClose(hFile);
return rc;
}
rdMulti = 100.0 / (cbFile ? cbFile : 1);
}
/* Allocate a reasonably large buffer, fall back on a tiny one. */
void *pvBufFree;
size_t cbBuf = _1M;
void *pvBuf = pvBufFree = RTMemTmpAlloc(cbBuf);
if (!pvBuf)
{
cbBuf = 0x1000;
pvBuf = alloca(cbBuf);
}
/* Read that file in blocks */
size_t cbReadTotal = 0;
for (;;)
{
size_t cbRead;
rc = RTFileRead(hFile, pvBuf, cbBuf, &cbRead);
if (RT_FAILURE(rc) || !cbRead)
break;
RTSha256Update(&Ctx, pvBuf, cbRead);
cbReadTotal += cbRead;
/* Call the progress callback if one is defined */
if (pfnProgressCallback)
{
rc = pfnProgressCallback((unsigned)(cbReadTotal * rdMulti), pvUser);
if (RT_FAILURE(rc))
break; /* canceled */
}
}
RTMemTmpFree(pvBufFree);
RTFileClose(hFile);
if (RT_FAILURE(rc))
return rc;
/* Finally calculate & format the SHA256 sum */
uint8_t abHash[RTSHA256_HASH_SIZE];
RTSha256Final(&Ctx, abHash);
char *pszDigest;
rc = RTStrAllocEx(&pszDigest, RTSHA256_DIGEST_LEN + 1);
if (RT_SUCCESS(rc))
{
rc = RTSha256ToString(abHash, pszDigest, RTSHA256_DIGEST_LEN + 1);
if (RT_SUCCESS(rc))
*ppszDigest = pszDigest;
else
RTStrFree(pszDigest);
}
return rc;
}
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