GetCspSha256Hash.ps1

Function Get-CspSha256Hash
{
  <#
    .SYNOPSIS
      Generates SHA256 hash for Content Security Policy (CSP).
    .DESCRIPTION
      Creates a SHA256 hash of provided inline text to satisfy CSP.
    .EXAMPLE
      $Style = "html, body { height: 100%; font-family: 'Courier'; } .listed-item { display: flex; justify-content: center; align-items: center; }"
	    Get-CspSha256Hash $Style
  #>
  
	  [CmdletBinding()]
	  param(
	    [Parameter(Mandatory=$true)]
	    [ValidateNotNullOrEmpty()]
	    [System.String]
	    #Text to hash
	    $Text
	  )

	  $CSP = New-Object System.Security.Cryptography.SHA256CryptoServiceProvider
	  $TextBytes = [System.Text.Encoding]::UTF8.GetBytes($Text)
	  $HashBytes = $CSP.ComputeHash($TextBytes)
	  $CSPHash = [System.Convert]::ToBase64String($HashBytes)
	  $Result = 'sha256-{0}' -f $CSPHash
	  return $Result

	} # End Function Get-CspSha256Hash