<# .SYNOPSIS Checks credentials .DESCRIPTION This PowerShell script asks for credentials and checks them against saved ones ("$HOME\my.credentials" by default). .PARAMETER TargetFile Specifies the target file ("$HOME\my.credentials" by default) .EXAMPLE PS> ./check-credentials.ps1 Enter username and password, please. ✔️ Your credentials are correct. .LINK https://github.com/fleschutz/PowerShell .NOTES Author: Markus Fleschutz | License: CC0 #> param([string]$TargetFile = "$HOME\my.credentials") try { Write-Host "Enter username and password, please." -foreground red $credsFromUser = Get-Credential $secureString = Get-Content "$TargetFile" | ConvertTo-SecureString $credsFromFile = New-Object System.Management.Automation.PSCredential($credsFromUser.UserName, $secureString) if ($credsFromUser.UserName -ne $credsFromFile.UserName) { throw "Sorry, your username is wrong." } $pw1 = [Runtime.InteropServices.Marshal]::PtrToStringAuto([Runtime.InteropServices.Marshal]::SecureStringToBSTR($credsFromUser.Password)) $pw2 = [Runtime.InteropServices.Marshal]::PtrToStringAuto([Runtime.InteropServices.Marshal]::SecureStringToBSTR($credsFromFile.Password)) if ($pw1 -cne $pw2) { throw "Sorry, your password is wrong." } "✔️ Your credentials are correct." exit 0 # success } catch { "⚠️ Error in line $($_.InvocationInfo.ScriptLineNumber): $($Error[0])" exit 1 }