function Get-FileHash { [CmdletBinding(DefaultParameterSetName = "Path")] param( [Parameter(Mandatory, ParameterSetName="Path", Position = 0)] [System.String[]] $Path, [Parameter(Mandatory, ParameterSetName="LiteralPath", ValueFromPipelineByPropertyName = $true)] [Alias("PSPath")] [System.String[]] $LiteralPath, [Parameter(Mandatory, ParameterSetName="Stream")] [System.IO.Stream] $InputStream, [ValidateSet("SHA1", "SHA256", "SHA384", "SHA512", "MACTripleDES", "MD5", "RIPEMD160")] [System.String] $Algorithm="SHA256" ) begin { # Construct the strongly-typed crypto object $hasher = [System.Security.Cryptography.HashAlgorithm]::Create($Algorithm) } process { if($PSCmdlet.ParameterSetName -eq "Stream") { GetStreamHash -InputStream $InputStream -RelatedPath $null -Hasher $hasher } else { $pathsToProcess = @() if($PSCmdlet.ParameterSetName -eq "LiteralPath") { $pathsToProcess += Resolve-Path -LiteralPath $LiteralPath | Foreach-Object ProviderPath } if($PSCmdlet.ParameterSetName -eq "Path") { $pathsToProcess += Resolve-Path $Path | Foreach-Object ProviderPath } foreach($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) GetStreamHash -InputStream $stream -RelatedPath $filePath -Hasher $hasher } 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() } } } } } } function GetStreamHash { param( [System.IO.Stream] $InputStream, [System.String] $RelatedPath, [System.Security.Cryptography.HashAlgorithm] $Hasher) # Compute file-hash using the crypto object [Byte[]] $computedHash = $Hasher.ComputeHash($InputStream) [string] $hash = [BitConverter]::ToString($computedHash) -replace '-','' if ($RelatedPath -eq $null) { $retVal = [PSCustomObject] @{ Algorithm = $Algorithm.ToUpperInvariant() Hash = $hash } $retVal.psobject.TypeNames.Insert(0, "Microsoft.Powershell.Utility.FileHash") $retVal } else { $retVal = [PSCustomObject] @{ Algorithm = $Algorithm.ToUpperInvariant() Hash = $hash Path = $RelatedPath } $retVal.psobject.TypeNames.Insert(0, "Microsoft.Powershell.Utility.FileHash") $retVal } } # 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