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This package was approved by moderator purity on 3/2/2015.

Jacksum is a free and platform independent software for computing and verifying checksums, CRCs and message digests (known as hash values and fingerprints). "Jacksum" is a synthetic word made of JAva and ChecKSUM.

Jacksum supports 58 popular standard algorithms (Adler32, BSD sum, Bzip2's CRC-32, POSIX cksum, CRC-8, CRC-16, CRC-24, CRC-32 (FCS-32), CRC-64, ELF-32, eMule/eDonkey, FCS-16, GOST R 34.11-94, HAS-160, HAVAL (3/4/5 passes, 128/160/192/224/256 bits), MD2, MD4, MD5, MPEG-2's CRC-32, RIPEMD-128, RIPEMD-160, RIPEMD-256, RIPEMD-320, SHA-0, SHA-1, SHA-224, SHA-256, SHA-384, SHA-512, Tiger-128, Tiger-160, Tiger, Tiger2, Tiger Tree Hash, Tiger2 Tree Hash, Unix System V sum, sum8, sum16, sum24, sum32, Whirlpool-0, Whirlpool-1, Whirlpool and xor8).

Jacksum supports the "Rocksoft (tm) Model CRC Algorithm", it can calculate customized CRC algorithms (all from 8 bit to 64 bit) and it supports the combination of multiple algorithms. Due to those features, millions of different new algorithms are possible.

Jacksum has opened it's source code and it is released under the terms of the GNU GPL. Jacksum is OSI Certified Open Source Software. OSI Certified is a certification mark of the Open Source Initiative.

Jacksum is platform independent, because it is written entirely in the Java programming language, the software runs on any platform having a Java Runtime Environment.

Jacksum has multiple interfaces. It can be used on the command line, at your file browser/manager, and it can be found as engine also in many other software projects.

Frequently Asked Questions (FAQ)
Source code repository

To install Jacksum, run the following command from the command line or from PowerShell:

C:\> choco install jacksum

To upgrade Jacksum, run the following command from the command line or from PowerShell:

C:\> choco upgrade jacksum


  • tools\chocolateyInstall.ps1 Show
    $packageName = "jacksum"
    $url = ""
    $url64 = "$url"
    $toolsDir = "$(Split-Path -parent $MyInvocation.MyCommand.Definition)"
    $checksum = "e3d840fa7b9949003ca731c7ce3e0281c350d821"
    $checksumType = 'sha1'
    $checksum64 = "e3d840fa7b9949003ca731c7ce3e0281c350d821"
    $checksumType64 = 'sha1'
    Install-ChocolateyZipPackage -PackageName "$packageName" -Url "$url" -UnzipLocation "$toolsDir" -Url64bit "$url64" -Checksum "$checksum" -ChecksumType "$checksumType" -Checksum64 "$checksum64" -ChecksumType64 "$checksumType64"
    try {
      $chocoBinPath = Join-Path "$Env:ChocolateyInstall" 'bin'
    	$batPath = Join-Path $toolsDir 'windows'
    	$batName = "$packageName.bat"
    	Get-Content (Join-Path $batPath "$batName") | foreach-object { $_ -replace '(^java.*?")(.*?:\\.*?)(\\jacksum.jar)(".*?)',"`$1$toolsDir`$3`$4" } | Set-Content (Join-Path $chocoBinPath "$batName")
    	Remove-Item -Recurse (Join-Path "$toolsDir" 'unix')
    	Write-ChocolateySuccess "$packageName"
    } catch {
    	Write-ChocolateyFailure $packageName $($_.Exception.Message)
  • tools\chocolateyUninstall.ps1 Show
    try {
    	$packageName = 'jacksum'
      $chocoBinPath = Join-Path "$Env:ChocolateyInstall" 'bin'
    	$batName = "$packageName.bat"	
    	Remove-Item (Join-Path "$chocoBinPath" "$batName") -Force
      Write-ChocolateySuccess "$packageName"
    } catch {
      Write-ChocolateyFailure "$packageName" "$($_.Exception.Message)"

Virus Scan Results

In cases where actual malware is found, the packages are subject to removal. Software sometimes has false positives. Moderators do not necessarily validate the safety of the underlying software, only that a package retrieves software from the official distribution point and/or validate embedded software against official distribution point (where distribution rights allow redistribution).

Chocolatey Pro provides runtime protection from possible malware.


Package Maintainer(s)

Software Author(s)

  • Johann N. Löfflmann


© Johann N. Löfflmann


Release Notes

Version History

Version Downloads Last updated Status

Discussion for the Jacksum Package

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