## TEST-CERTIFICATE
##
## Script to check the status of a certificate
##
## v1.0
## Nial Francis 16/05/2019

[CmdletBinding()]
param(
    [Parameter(Mandatory=$True)][string]$CertPath
)

function Test-Certificate ($CertPath) {
    $cert = New-Object System.Security.Cryptography.X509Certificates.X509Certificate2
    $chain = New-Object System.Security.Cryptography.X509Certificates.X509Chain

    $cert.Import($CertPath)
    try {
        $status = $chain.Build($cert)
    } catch {
        throw "File is not a valid certificate"
    }

    if ($status) {
        Write-Host "The certificate is valid"
    } else {
        Write-Host "The certificate is invalid due to:"
        foreach ($item in $chain.ChainStatus) {
            $hash += @{ $item.Status = $item.StatusInformation }
        }
        ($hash | Format-Table -HideTableHeaders -Wrap | Out-String).Trim()
    }
}

Test-Certificate $CertPath