Utilities/Get-ExpressionCacheHash.ps1
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function Get-ExpressionCacheHash { [CmdletBinding()] param( [Parameter(Mandatory, ValueFromPipeline, ValueFromPipelineByPropertyName)] [Alias('Text', 'String')] [AllowNull()] [string]$InputString ) begin { # Create once per pipeline $hasher = [System.Security.Cryptography.HashAlgorithm]::Create('SHA256') $encoding = [System.Text.Encoding]::UTF8 if (-not $hasher) { throw "Unable to create SHA256 hasher." } } process { # Coerce $null to empty string so the pipeline keeps flowing $bytes = $encoding.GetBytes([string]$InputString) $hashBytes = $hasher.ComputeHash($bytes) # hex without hyphens, lowercase [System.BitConverter]::ToString($hashBytes).Replace('-', '').ToLowerInvariant() } end { if ($hasher -is [System.IDisposable]) { $hasher.Dispose() } } } |