计算机上文件校验和的最佳方法是什么？

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I personally use Cygwin, which puts the entire smörgåsbord of Linux utilities at my fingertip --- there's md5sum and all the cryptographic digests supported by OpenSSL. Alternatively, you can also use a Windows distribution of OpenSSL (the "light" version is only a 1 MB installer).

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最佳答案

Any MD5 will produce a good checksum to verify the file. Any of the files listed at the bottom of this page will work fine. http://en.wikipedia.org/wiki/Md5sum

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On MySQL.com, MD5s are listed alongside each file that you can download. For instance, MySQL "Windows Essentials" 5.1 is 528c89c37b3a6f0bd34480000a56c372.

You can download md5 (md5.exe), a command line tool that will calculate the MD5 of any file that you have locally. MD5 is just like any other cryptographic hash function, which means that a given array of bytes will always produce the same hash. That means if your downloaded MySQL zip file (or whatever) has the same MD5 as they post on their site, you have the exact same file.

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Just use win32 Checksum api. MD5 is native in Win32.

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Note that the above solutions will not tell you if your installation is correct only if your install.exe is correct (you can trust it to produce a correct install.)

You would need MD5 sums for each file/folder to test if the installed code has been messed with after the install completed.

WinMerg is useful to compare two installs (on two different machines perhaps) to see if one has been changed or why one is broken.

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On Windows : you can use FCIV utility : http://support.microsoft.com/kb/841290

On Unix/Linux : you can use md5sum : http://linux.about.com/library/cmd/blcmdl1_md5sum.htm

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When I worked with Windows, I found handy HashTab 3rd party tool. It shows MD5, SHA-1 check sums in one of file properties tabs. http://implbits.com/products/hashtab/

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Checksum tabs: http://code.kliu.org/hashcheck/

This has worked great for me on windows for a while now. It allows easy copying and pasting of checksums. It has box to type/paste check sums from webpages and show matches or non matches quite well.

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Download fciv.exe directly from http://www.microsoft.com/en-us/download/confirmation.aspx?id=11533

shell> fciv.exe [yourfile]

will give you md5 by default.

You can read up the help file fciv.exe -h

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The CertUtil is a pre-installed Windows utility, that can be used to generate hash checksums:

CertUtil -hashfile pathToFileToCheck [HashAlgorithm]

HashAlgorithm choices: MD2 MD4 MD5 SHA1 SHA256 SHA384 SHA512

So for example, the following generates an MD5 checksum for the file C:\TEMP\MyDataFile.img:

CertUtil -hashfile C:\TEMP\MyDataFile.img MD5

To get output similar to *Nix systems you can add some PS magic:

$(CertUtil -hashfile C:\TEMP\MyDataFile.img MD5)[1] -replace " ",""

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for sure the certutil is the best approach but there's a chance to hit windows xp/2003 machine without certutil command.There makecab command can be used which has its own hash algorithm - here the fileinf.bat which will output some info about the file including the checksum.

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Hashing is a standalone application that performs MD5, SHA-1 and SHA-2 family. Built upon OpenSSL.

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I like to use HashMyFiles for windows.

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Just to add another option for Windows users, the Get-FileHash PowerShell cmdlet can be used (https://technet.microsoft.com/en-us/library/dn520872.aspx).

Example usage: Get-FileHash MyImage.iso -Algorithm MD5

If all you're after is just the raw hash then: (Get-FileHash MyImage.iso -Algorithm MD5).Hash

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7-Zip can be used to generate hashes for files, folders of files, and trees of folders of files. 7-Zip is small footprint and a very useful compression utility. http://7-zip.org/

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QuickHash an open source tool supporting MD5, SHA1, SHA256, SHA512 and available for the Linux, Windows, and Apple Mac.

https://sourceforge.net/projects/quickhash/

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The Powershell utility Get-FileHash worked perfectly for me.

https://msdn.microsoft.com/en-us/powershell/reference/5.1/microsoft.powershell.utility/get-filehash

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To calculate md5 of all the files in the current directory in windows 7

for %i in (*) DO CertUtil -hashfile %i MD5

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In HPUX ( hp UNIX)

Please install the md5sum package on your UNIX machine for example, if there is a file called a.txt

shell > md5sum a.txt

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Best utility for Windows is HashCheck that is now on GitHub. https://github.com/gurnec/HashCheck/releases/tag/v2.4.0

Install HashCheck. Now right click on the file -> Create verification file. It will create a file.extension.md5 file with MD5 code in it.

Love it.