RTSha1Digest.cpp revision 46d38faf08231fd76b6f0a62119f1c15347b0ecf
/* $Id$ */
/** @file
* IPRT - SHA1 digest creation
*/
/*
* Copyright (C) 2009 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/assert.h>
#include <iprt/err.h>
#include <iprt/stream.h>
#include <iprt/string.h>
#include <iprt/mem.h>
#include <openssl/sha.h>
RTR3DECL(int) RTSha1Digest(const char *pszFile, char **ppszDigest)
{
/* Validate input */
AssertPtrReturn(pszFile, VERR_INVALID_POINTER);
AssertPtrReturn(ppszDigest, VERR_INVALID_POINTER);
*ppszDigest = NULL;
/* Initialize OpenSSL */
SHA_CTX ctx;
if (!SHA1_Init(&ctx))
return VERR_INTERNAL_ERROR;
/** @todo r=bird: Using a stream here doesn't really serve much purpose as
* few stream implementations uses a buffer much larger than 4KB. (The
* only I'm aware of is libc on OS/2, which uses 8KB.) */
/* Open the file to calculate a SHA1 sum of */
PRTSTREAM pStream;
int rc = RTStrmOpen(pszFile, "rb", &pStream);
if (RT_FAILURE(rc))
return rc;
/* Read that file in blocks */
void *pvBuf[4096];
size_t cbRead;
do
{
cbRead = 0;
rc = RTStrmReadEx(pStream, pvBuf, 4096, &cbRead);
if (RT_FAILURE(rc))
break;
if(!SHA1_Update(&ctx, pvBuf, cbRead))
{
rc = VERR_INTERNAL_ERROR;
break;
}
} while (cbRead > 0);
RTStrmClose(pStream);
if (RT_FAILURE(rc))
return rc;
/* Finally calculate & format the SHA1 sum */
unsigned char auchDig[20];
if (!SHA1_Final(auchDig, &ctx))
return VERR_INTERNAL_ERROR;
*ppszDigest = (char*)RTMemAlloc(41);
rc = RTSha1ToString(auchDig, *ppszDigest, 41);
if (RT_FAILURE(rc))
RTStrFree(*ppszDigest);
return rc;
}