X509Details.psm1

function Get-X509Details {
    [cmdletbinding()]
    param(
        [Parameter(Mandatory = $true, ValueFromPipeline = $true, Position = 0)]
        [string]$cert
    )

    <#
.SYNOPSIS
 
Decode an X509 Certificate and present it as a PowerShell Object.
Certificate PowerShell Object details updated to include the X509 Certificate time to expiry (timeToExpiry).
 
.DESCRIPTION
 
Decode an X509 Certificate and present it as a PowerShell Object.
Certificate PowerShell Object details updated to include the X509 Certificate time to expiry (timeToExpiry).
 
.PARAMETER cert
 
The X509 Certificate to decode and udpate with time to expiry
 
.INPUTS
 
Certificate from Pipeline
 
.OUTPUTS
 
PowerShell Object
 
.SYNTAX
 
Get-X509Details(cert)
 
.EXAMPLE
 
PS> Get-X509Details('MIIDtzCCAp+gAwIBAgIQZpJpy9zmR........URpc0T9DzsUUfoHfbQ==')
or
PS> 'MIIDtzCCAp+gAwIBAgIQZpJpy9zmR........URpc0T9DzsUUfoHfbQ==' | Get-X509Details
or
PS> Get-X509Details('@
                    -----BEGIN CERTIFICATE-----
                    MIIDtzCCAp
                    ........URpc0T9DzsUUfoHfbQ==
                    -----END CERTIFICATE-----
                    '@)
 
.LINK
 
https://blog.darrenjrobinson.com
https://blog.darrenjrobinson.com/jwtdetails-powershell-module-for-decoding-jwt-access-tokens-with-readable-token-expiry-time/
 
#>

    # Test textual encoding as per https://tools.ietf.org/html/rfc7468
    $verCertStart = "-----BEGIN CERTIFICATE-----`r`nM"
    $verCertEnd = "=`r`n-----END CERTIFICATE-----"
    if ($cert.StartsWith($verCertStart) -and $cert.EndsWith($verCertEnd)) { 
        $check = $true 
        $cert = $cert.Replace("-----BEGIN CERTIFICATE-----", "")
        $cert = $cert.Replace("-----END CERTIFICATE-----", "")
        $cert = $cert.trim()
    } 
    if (!$check) {
        if (!$cert.StartsWith("M") -and !$cert.EndsWith('=')) { 
            Write-Error "Invalid certificate or not in PEM / CER Format $($_)" -ErrorAction Stop 
        }
    }

    try {
        # Windows PowerShell
        $certData = New-Object System.Security.Cryptography.X509Certificates.X509Certificate2    
        $certData.Import([Convert]::FromBase64String($cert))
    }
    catch {
        # PowerShell Core/6/7+
        $certData = New-Object System.Security.Cryptography.X509Certificates.X509Certificate2(, [Convert]::FromBase64String($cert))
    }
    try {
        Write-Verbose "Certificate:$($certData.Subject)"        

        # Time to Expiry
        $timeToExpiry = ($certData.NotAfter - (get-date))
        Write-Verbose "Days until certificatioin expiry: $($timeToExpiry)"        
        $certData | Add-Member -Type NoteProperty -Name "timeToExpiry" -Value $timeToExpiry
        return $certData | Select-Object -property Subject, Issuer, IssuerName, Thumbprint, FriendlyName, NotBefore, NotAfter, HasPrivateKey, Extensions, DnsNameList, version, SendAsTrustedIssuer, PrivateKey, PublicKey, EnhancedKeyUsageList, timetoexpiry | Format-List
    }
    catch {
        Write-Error "Invalid certificate or not in PEM / CER Format $($_)" -ErrorAction Stop 
    }
}

Export-ModuleMember -Function 'Get-X509Details'
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