How to get boolean result of md5sum from two files in powershell

enthuguy
enthuguy used Ask the Experts™
on
I had this question after viewing md5sum check using powershell v 1.0.

Hi Experts,
this is an extension to my above question.

could you pls help how to loop thru a directory and get md5sum on each file and find the same file on another directory and run the md5sum and return true or false

Say directory1 has 3 files and directory2 has 10 files.
Loop through each file in directory1 get md5 and find same file in directory2 and get md5 too
Get a summary of each file to a output file

output.txt
file1 = success
file2 = success
file3 = failure (md5 value did not match)
Comment
Watch Question

Do more with

Expert Office
EXPERT OFFICE® is a registered trademark of EXPERTS EXCHANGE®
Try something like this

$directory1 = '\\server\share\folder1'
$directory2 = '\\server\share\folder2'

$files = GCI $directory1  

ForEach ($f in $files) {
    $hash1 = Get-FileHash $f.fullname
    $hash2 = Get-FileHash (Join-Path $directory2 $f.name)
    Write-Host $f.name ($hash1 -eq $hash2)
    }

Open in new window

Top Expert 2016

Commented:
Function Get-FileHash
{
	[CmdletBinding(DefaultParameterSetName = 'Path')]
	param(
		[System.String[]]
		$Path,

		[Alias('PSPath')]
		[System.String[]]
		$LiteralPath,

		[System.String]
		$Algorithm='SHA256'
	)
	
	# Construct the strongly-typed crypto object
	$hasher = [System.Security.Cryptography.HashAlgorithm]::Create($Algorithm)
	
	$pathsToProcess = @()
	
	if($PSCmdlet.ParameterSetName  -eq 'LiteralPath')
	{
		$pathsToProcess += Resolve-Path -LiteralPath $LiteralPath
	}
	else
	{
		$pathsToProcess += Resolve-Path $Path
	}
	
	foreach($filePath in $pathsToProcess)
	{
		if(Test-Path -LiteralPath $filePath -PathType Container)
		{
			continue
		}
		
		try
		{
			# Read the file specified in $FilePath as a Byte array
			[system.io.stream]$stream = [system.io.file]::OpenRead($FilePath)

			# Compute file-hash using the crypto object
			[Byte[]] $computedHash = $hasher.ComputeHash($stream)
		}
		catch [Exception]
		{
			$errorMessage = [Microsoft.PowerShell.Commands.UtilityResources]::FileReadError -f $FilePath, $_
			Write-Error -Message $errorMessage -Category ReadError -ErrorId 'FileReadError' -TargetObject $FilePath
			return
		}
		finally
		{
			if($stream)
			{
				$stream.Close()
			}
		}
		
		# Convert to hex-encoded string
		[string] $hash = [BitConverter]::ToString($computedHash) -replace '-',''

		$retVal = [PSCustomObject] @{
			Algorithm = $Algorithm.ToUpperInvariant()
			Hash = $hash
			Path = $filePath
		}
		$retVal.psobject.TypeNames.Insert(0, 'Microsoft.Powershell.Utility.FileHash')

		$retVal
	}
}

$myobject = @()
$directory1 = read-host('Input Directory 1 Location')
if (!(test-path $directory1)) {
write-output ('invalid path:{0}' -f $directory1)
break
}
$directory2 = read-host('Input Directory 2 Location')
if (!(test-path $directory2)) {
write-output ('invalid path:{0}' -f $directory2)
break
}
if( $directory2[$directory2.Length -1] -ne '\'){
$directory2 += '\'
}
$files = get-childitem -path $directory1 -File
foreach ($file in $files){
$hash = Get-FileHash $file.fullname
$object = new-object -Typename psobject 
$object | add-member -MemberType NoteProperty -Name 'Filename' -Value $file.name
$object | add-member -MemberType NoteProperty -Name 'Hash' -Value $hash.Hash
$myobject += $object
}
$myobject2 = @()
foreach ($file in $myobject)
{

$testfile = $directory2 + $file.filename
if(!(Test-path $testfile)) {
write-output ('{0} not found' -f $testfile)
break
}
else {
$successful = '= Success'
$hash = Get-FileHash $testfile
if ($file.hash -ne $hash.hash){
$successful = '= Failure (md5 value not match)'
}
write-output('{0} = {1}' -f $file.fileName,$successful)
$object = new-object -Typename psobject 
$object | add-member -MemberType NoteProperty -Name 'Filename' -Value $file.Filename
$object | add-member -MemberType NoteProperty -Name 'Success' -Value $successful
$myobject2 += $object
}
$myobject2 | out-file c:\test2\ee.txt

}

Open in new window

Author

Commented:
Thanks Carlo, that looks neat but I believe 1.0 doesn't support this

thanks David, I will try tonight, as I'm away from my pc. btw how should call this function? how to pass the two directory as parameter  (sorry I'm sort of new to powershell)
Ensure you’re charging the right price for your IT

Do you wonder if your IT business is truly profitable or if you should raise your prices? Learn how to calculate your overhead burden using our free interactive tool and use it to determine the right price for your IT services. Start calculating Now!

Top Expert 2016

Commented:
it will ask you.. read-host gets input from standard input which in this case is the keyboard
Using the same function from the other post, I would keep it simple create 2 arrays with a list of files and hashes and then use compare-object to find the differences.

Function Get-FileHash
{
	[CmdletBinding(DefaultParameterSetName = "Path")]
	param(
		[System.String[]]
		$Path,

		[Alias("PSPath")]
		[System.String[]]
		$LiteralPath,

		[System.String]
		$Algorithm="SHA256"
	)
	
	# Construct the strongly-typed crypto object
	$hasher = [System.Security.Cryptography.HashAlgorithm]::Create($Algorithm)
	
	$pathsToProcess = @()
	
	if($PSCmdlet.ParameterSetName  -eq "LiteralPath")
	{
		$pathsToProcess += Resolve-Path -LiteralPath $LiteralPath
	}
	else
	{
		$pathsToProcess += Resolve-Path $Path
	}
	
	foreach($filePath in $pathsToProcess)
	{
		if(Test-Path -LiteralPath $filePath -PathType Container)
		{
			continue
		}
		
		try
		{
			# Read the file specified in $FilePath as a Byte array
			[system.io.stream]$stream = [system.io.file]::OpenRead($FilePath)

			# Compute file-hash using the crypto object
			[Byte[]] $computedHash = $hasher.ComputeHash($stream)
		}
		catch [Exception]
		{
			$errorMessage = [Microsoft.PowerShell.Commands.UtilityResources]::FileReadError -f $FilePath, $_
			Write-Error -Message $errorMessage -Category ReadError -ErrorId "FileReadError" -TargetObject $FilePath
			return
		}
		finally
		{
			if($stream)
			{
				$stream.Close()
			}
		}
		
		# Convert to hex-encoded string
		[string] $hash = [BitConverter]::ToString($computedHash) -replace '-',''

		$retVal = [PSCustomObject] @{
			Algorithm = $Algorithm.ToUpperInvariant()
			Hash = $hash
			Path = $filePath
		}
		$retVal.psobject.TypeNames.Insert(0, "Microsoft.Powershell.Utility.FileHash")

		$retVal
	}
}

$arr1 = gci -Recurse c:\temp\folder1 | % {
	Get-FileHash $_.fullname} | select `
		@{n="Hash";e={$_.item("hash")}}, `
		@{n="algorithm";e={$_.item("algorithm")}}, `
		@{n="Path";e={$_.item("path")}
}

$arr2 = gci -Recurse c:\temp\folder2 | % {
	Get-FileHash $_.fullname} | select `
		@{n="Hash";e={$_.item("hash")}}, `
		@{n="algorithm";e={$_.item("algorithm")}}, `
		@{n="Path";e={$_.item("path")}
}

Compare-Object -ReferenceObject $arr1 -DifferenceObject $arr2 -Property hash | % {
	$indicator = $_
	if ($indicator.sideindicator -eq "<=")
	{
		$arr1 | ? {$_.hash -eq $indicator.hash}
	}
	else
	{
		$arr2 | ? {$_.hash -eq $indicator.hash}
	}
}

Open in new window


I find Compare-Object a simple way to compare arrays.

Author

Commented:
Hi David,
Thanks very much...that worked fine for me, I will attempt how to pass two directories as arguments to that function.

@Learnctx,
I changed the path in the function but I rece. below blank report. I'm sure I did something wrong...sorry :(

PS C:\parent\scripts> .\compareMD52.ps1

Hash                                                        algorithm                                                   Path
----                                                        ---------                                                   ----
Top Expert 2016
Commented:
Test-something -directory1 c:\temp -directory2 C:\test2
Test-something c:\temp C:\test2
Test-something c:\temp c:\test2 -verbose #shows files as compared
Test-something c:\temp c:\test2 -debug #opens output file when done

Function Get-FileHash
{
	[CmdletBinding(DefaultParameterSetName = 'Path')]
	param(
		[System.String[]]
		$Path,

		[Alias('PSPath')]
		[System.String[]]
		$LiteralPath,

		[System.String]
		$Algorithm='SHA256'
	)
	
	# Construct the strongly-typed crypto object
	$hasher = [System.Security.Cryptography.HashAlgorithm]::Create($Algorithm)
	
	$pathsToProcess = @()
	
	if($PSCmdlet.ParameterSetName  -eq 'LiteralPath')
	{
		$pathsToProcess += Resolve-Path -LiteralPath $LiteralPath
	}
	else
	{
		$pathsToProcess += Resolve-Path $Path
	}
	
	foreach($filePath in $pathsToProcess)
	{
		if(Test-Path -LiteralPath $filePath -PathType Container)
		{
			continue
		}
		
		try
		{
			# Read the file specified in $FilePath as a Byte array
			[system.io.stream]$stream = [system.io.file]::OpenRead($FilePath)

			# Compute file-hash using the crypto object
			[Byte[]] $computedHash = $hasher.ComputeHash($stream)
		}
		catch [Exception]
		{
			$errorMessage = [Microsoft.PowerShell.Commands.UtilityResources]::FileReadError -f $FilePath, $_
			Write-Error -Message $errorMessage -Category ReadError -ErrorId 'FileReadError' -TargetObject $FilePath
			return
		}
		finally
		{
			if($stream)
			{
				$stream.Close()
			}
		}
		
		# Convert to hex-encoded string
		[string] $hash = [BitConverter]::ToString($computedHash) -replace '-',''

		$retVal = [PSCustomObject] @{
			Algorithm = $Algorithm.ToUpperInvariant()
			Hash = $hash
			Path = $filePath
		}
		$retVal.psobject.TypeNames.Insert(0, 'Microsoft.Powershell.Utility.FileHash')

		$retVal
	}
}

function Test-Something
{
    <#
        .SYNOPSIS
        Short Description
        .DESCRIPTION
        Detailed Description
        .EXAMPLE
        Test-Something
        explains how to use the command
        can be multiple lines
        .EXAMPLE
        Test-Something
        another example
        can have as many examples as you like
        .EXAMPLE
        Test-something -directory1 c:\temp -directory2 C:\test2
         .EXAMPLE
        Test-something c:\temp C:\test2
    #>
    [CmdletBinding()]
    param
    (
        [Parameter(Mandatory=$false, Position=0)]
        [Object]
        $directory1 = (read-host('Input Directory 1 Location')),
        
        [Parameter(Mandatory=$false, Position=1)]
        [Object]
        $directory2 =(read-host('Input Directory 2 Location'))

    )
    
        
    if (!(test-path $directory1)) {
        write-output ('invalid path:{0}' -f $directory1)
        break
    }
   
    if (!(test-path $directory2)) {
        write-output ('invalid path:{0}' -f $directory2)
        break
    }
    if( $directory2[$directory2.Length -1] -ne '\'){
        $directory2 += '\'
    }
    $myobject = @()
    $files = get-childitem -path $directory1 -File
    foreach ($file in $files){
        $hash = Get-FileHash $file.fullname
        $object = new-object -Typename psobject 
        $object | add-member -MemberType NoteProperty -Name 'Filename' -Value $file.name
        $object | add-member -MemberType NoteProperty -Name 'Hash' -Value $hash.Hash
        $myobject += $object
    }
    $myobject2 = @()
    foreach ($file in $myobject)
    {
        
        $testfile = $directory2 + $file.filename
        if(!(Test-path $testfile)) {
            write-output ('{0} not found' -f $testfile)
            break
        }
        else {
            $successful = '= Success'
            $hash = Get-FileHash $testfile
            if ($file.hash -ne $hash.hash){
                $successful = '= Failure (md5 value not match)'
            }
            write-verbose('{0} = {1}' -f $file.fileName,$successful)
            $object = new-object -Typename psobject 
            $object | add-member -MemberType NoteProperty -Name 'Filename' -Value $file.Filename
            $object | add-member -MemberType NoteProperty -Name 'Success' -Value $successful
            $myobject2 += $object
        }
        $myobject2 | out-file c:\test2\ee.txt
       
    }
    if($DebugPreference -ne 'SilentlyContinue') {
     c:\test2\ee.txt
     }
}

Open in new window

Author

Commented:
Thanks very much!!

Do more with

Expert Office
Submit tech questions to Ask the Experts™ at any time to receive solutions, advice, and new ideas from leading industry professionals.

Start 7-Day Free Trial