Public/strings/Get-FileHash.ps1
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function Get-FileHash { <# .SYNOPSIS Returns hash from a file .DESCRIPTION Returns hash from a file using given hash algorithm. Default algorithm is: 'MD5' .PARAMETER FileName Name/path of the file to be hashed .PARAMETER HashName Hash algorithm name .EXAMPLE Get-FileHash README.md Returns hash from "README.md" file, which is located in the current directory .EXAMPLE Get-FileHash "C:\README.md" Returns hash from "README.md" file, which is location is "C:\README.md" .EXAMPLE Get-FileHash README.md -HashName "sha256" Returns hash from "README.md" file, which is located in the current directory using 'sha256' algorithm #> [CmdletBinding()] param( [Parameter(Mandatory = $true, Position = 0)] [String]$FileName, [Parameter(Mandatory = $false, Position = 1)] [String]$HashName = "MD5" ) process { if (!(Test-Path $FileName)) { $curLoc = Get-Location $FileName = Join-Path $curLoc $FileName } if (!(Test-Path $FileName)) { Write-Error "Could not find file $FileName" exit } $FileName = Get-Item -Path $FileName $FileStream = New-Object System.IO.FileStream($FileName, [System.IO.FileMode]::Open) $StringBuilder = New-Object System.Text.StringBuilder [System.Security.Cryptography.HashAlgorithm]::Create($HashName).ComputeHash($FileStream) | % { [Void]$StringBuilder.Append($_.ToString("x2")) } $FileStream.Close() $FileStream.Dispose() $StringBuilder.ToString() } } |