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function Save-SignedScript {
    [CmdletBinding(DefaultParameterSetName='subject')]
    param(
        [parameter(Mandatory,ValueFromPipeline)]
        [string] $FilePath,
        [parameter(Mandatory,ParameterSetName='cert')]
        [System.Security.Cryptography.X509Certificates.X509Certificate2]
        $Certificate,
        [Parameter(Mandatory=$false,ParameterSetName='subject')]
        [string] $Subject
    )
    begin {
        if (! $Certificate)
        {
            if ($Subject)
            {
                $Temp = ls Cert:\CurrentUser\My\ -CodeSigningCert | ? Subject -Match $Subject
            }
            else
            {
                $Temp = ls Cert:\CurrentUser\My\ -CodeSigningCert
            }
            if (! $Temp)
            {
                Write-Warning 'コード署名用証明書が見つかりません'
                break
            }
            if ($Temp.GetType().Name -ne 'X509Certificate2')
            {
                Write-Host '  コード署名用の証明書を選択してください'
                Write-Host
                $Temp | ForEach-Object {
                    Write-Host "  $($Temp.IndexOf($_))) $($_.subject)"
                }
                Write-Host
                $Certificate = $Temp[$(Read-Host '番号')]
                if (! $Certificate)
                {
                    Write-Warning '不正な入力'
                    break
                }
            }
            else
            {
                $Certificate = $Temp
            }
        }
        if ($Certificate.Extensions.EnhancedKeyUsages.Value -notcontains '1.3.6.1.5.5.7.3.3') {
            # コード署名用ではなかったら
            Write-Warning "`n証明書の目的が「$($Certificate.Extensions.EnhancedKeyUsages.FriendlyName)」です`nコード署名用の証明書を指定してください"
            break
        }
        Write-Verbose $Certificate
    }
    process {
        if (Test-Path $FilePath)
        {
            Get-Item $FilePath | ForEach-Object {
                $SignedFileName = "$($_.BaseName).Signed$($_.Extension)"
                $_ | Copy-Item -Destination $SignedFileName
                $SignedFileName | Set-AuthenticodeSignature -Certificate $Certificate
            }
        }
        else
        {
            Write-Warning "No such file: $($FilePath)"
        }
    }
}