Create SHA256 Hash from a String

## Modified from https://xpertkb.com/compute-hash-string-powershell/

## Changed from original as MD5CryptoServiceProvider gives error  "This implementation is not part of the Windows Platform FIPS validated cryptographic algorithms"
## if FIPS compliant algorithms are enforced - see https://port135.com/fips-validated-cryptographic-algorithms/

function get-hash
{
    Param
    (
        [Parameter(Mandatory=$true,HelpMessage='String to hash')]
        [string]$textToHash
    )

    [string]$result = $null
    if( -Not [string]::IsNullOrEmpty( $textToHash ))
    {
        $hasher = $null
        $hasher = New-Object -TypeName System.Security.Cryptography.SHA256CryptoServiceProvider
        if( $hasher )
        {
            $toHash = [System.Text.Encoding]::UTF8.GetBytes( $textToHash )
            $hashByteArray = $hasher.ComputeHash( $toHash )
            foreach( $byte in $hashByteArray )
            {
              $result = "$result{0:X2}" -f $byte
            }
        }
    }
    $result ## return
 }