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Diffstat (limited to '')
| -rw-r--r-- | src/VBox/Runtime/common/checksum/RTSha256Digest.cpp | 191 |
1 files changed, 191 insertions, 0 deletions
diff --git a/src/VBox/Runtime/common/checksum/RTSha256Digest.cpp b/src/VBox/Runtime/common/checksum/RTSha256Digest.cpp new file mode 100644 index 00000000..cc4c13dd --- /dev/null +++ b/src/VBox/Runtime/common/checksum/RTSha256Digest.cpp @@ -0,0 +1,191 @@ +/* $Id: RTSha256Digest.cpp $ */ +/** @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; +} + |