Private/Test-IfStringIsValidBase64.ps1
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<#
.SYNOPSIS Function .DESCRIPTION #************************************************************************************************************ # Disclaimer # # This sample script is not supported under any Microsoft standard support program or service. This sample # script is provided AS IS without warranty of any kind. Microsoft further disclaims all implied warranties # including, without limitation, any implied warranties of merchantability or of fitness for a particular # purpose. The entire risk arising out of the use or performance of this sample script and documentation # remains with you. In no event shall Microsoft, its authors, or anyone else involved in the creation, # production, or delivery of this script be liable for any damages whatsoever (including, without limitation, # damages for loss of business profits, business interruption, loss of business information, or other # pecuniary loss) arising out of the use of or inability to use this sample script or documentation, even # if Microsoft has been advised of the possibility of such damages. # #************************************************************************************************************ #> #region Test-IfStringIsValidBase64 function Test-IfStringIsValidBase64 { param([string]$Text) # Check format: only valid Base64 characters and optional padding if ($Text -notmatch '^[A-Za-z0-9+/]*={0,2}$') { return $false } # Length must be a multiple of 4 if ($Text.Length % 4 -ne 0) { return $false } # Length must be at least 16 cahrs long if ($Text.Length -lt 16) { return $false } try { [Convert]::FromBase64String($Text) | Out-Null return $true } catch { return $false } } #endregion |