Invoke-Uplift-Security.ps1
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function Get-StringHash([String] $value, $checksumType = "SHA256") { # https://gallery.technet.microsoft.com/scriptcenter/Get-StringHash-aa843f71 $stringBuilder = New-Object System.Text.StringBuilder $alg = [System.Security.Cryptography.HashAlgorithm]::Create($checksumType) $alg.ComputeHash([System.Text.Encoding]::UTF8.GetBytes($value)) | ForEach-Object{ [Void]$stringBuilder.Append($_.ToString("x2")) } return $stringBuilder.ToString().ToUpper() } function Get-StringHashInner { param( [Parameter(Mandatory = $true)] [String] $String, [String] $HashName = "SHA256" ) $String = $String.Trim() # http://jongurgul.com/blog/get-stringhash-get-filehash/ # https://gallery.technet.microsoft.com/scriptcenter/Get-StringHash-aa843f71 $StringBuilder = New-Object System.Text.StringBuilder [System.Security.Cryptography.HashAlgorithm]::Create($HashName).ComputeHash([System.Text.Encoding]::UTF8.GetBytes($String)) ` | ForEach-Object{ [Void]$StringBuilder.Append($_.ToString("x2")) } return $StringBuilder.ToString().ToUpper() } function Get-StringHash([String] $String, $HashName = "SHA256") { # check that it works at all if("356A192B7913B04C54574D18C28D46E6395428AB" -ne (Get-StringHashInner "1" "SHA1" ) ) { throw "Get-StringHash() seems to be broken, incorrect hash for value '1'" } return Get-StringHashInner $String $HashName } function Confirm-ChecksumFileFilePath($dstFolder, $checksumType, $checksum) { $fileName = "$checksumType-$checksum".ToUpper() return (Join-Path -Path $dstFolder -ChildPath $fileName) } function Get-Checksum($filePath, $checksum, $checksumType) { Write-DebugMessage "Calculating checksum:" Write-DebugMessage " - filePath : $filePath" Write-DebugMessage " - checksum : $checksum" Write-DebugMessage " - checksumType: $checksumType" $checksumCacheExists = Validate-ChecksumFile $filePath $checksumType $checksum if($checksumCacheExists -eq $True) { Write-DebugMessage "[+] Checksum cache exists, skipping checksum calculation" return New-Object PSObject -Property @{ Result = $true Hash = $checksum.ToUpper() } } else { Write-DebugMessage "[-] Checksum cache does not exist, will calculate checksum again (might take a long time)" } $fileChecksum = Get-FileHash -Algorithm $checksumType $filePath if($fileChecksum.Hash -eq $checksum.ToUpper()) { return New-Object PSObject -Property @{ Result = $true Hash = $fileChecksum.Hash.ToUpper() } } return New-Object PSObject -Property @{ Result = $false Hash = $fileChecksum.Hash.ToUpper() } } |