Private/Get-MaskedString.ps1
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using namespace System.Runtime.InteropServices function Get-MaskedString { [CmdletBinding()] [OutputType([string])] param ( [Parameter(Mandatory, Position = 0, ValueFromPipeline = $true)] [AllowEmptyString()] [string]$Source, [Parameter(Mandatory, Position = 1)] [securestring][SecureStringTransformation()]$Target, [Parameter()] [uint32]$First = 0, [Parameter()] [uint32]$Last = 0, [Parameter()] [uint32]$MaxNumberOfAsterisks = [int]::MaxValue, [Parameter()] [uint32]$MinNumberOfAsterisks = 0 ) begin { # decrypt securestring [string]$PlainTarget = '' if ($null -ne $Source) { $bstr = [Marshal]::SecureStringToBSTR($Target) $PlainTarget = [Marshal]::PtrToStringBSTR($bstr) } } process { if ([string]::IsNullOrEmpty($Source)) { [string]::Empty return } if ([string]::IsNullOrEmpty($PlainTarget)) { $Source return } if ($First + $Last -gt $PlainTarget.Length) { $Source return } [int]$numberOfAsterisks = $PlainTarget.Length - $First - $Last if ($numberOfAsterisks -lt $MinNumberOfAsterisks) { $numberOfAsterisks = $MinNumberOfAsterisks } if ($numberOfAsterisks -gt $MaxNumberOfAsterisks) { $numberOfAsterisks = $MaxNumberOfAsterisks } [string]$Masked = [string]::Concat( $PlainTarget.Substring(0, $First), ''.PadLeft($numberOfAsterisks, '*'), $PlainTarget.Substring($PlainTarget.Length - $Last, $Last) ) [regex]::Replace($Source, $PlainTarget, $Masked, [System.Text.RegularExpressions.RegexOptions]::IgnoreCase) } end {} } |