How to Get All Certificates With Powershell?

To get all certificates with PowerShell, you can use the Get-ChildItem cmdlet with the Cert: provider. This will allow you to access the certificates stored in the Windows Certificate Store. You can filter the results by location, issuer, expiry date, and other criteria using properties of the certificate objects. Additionally, you can use the Export-Certificate cmdlet to export certificates to a file in various formats like PEM or PFX. By using PowerShell, you can automate the retrieval and management of certificates on your system.

What is the command to export public keys from certificates in PowerShell?

To export public keys from certificates in PowerShell, you can use the following command:

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$cert = Get-ChildItem -Path cert:\CurrentUser\My\thumbprint_of_certificate
$cert.PublicKey.Key.ExportSubjectPublicKeyInfo()

Replace "thumbprint_of_certificate" with the actual thumbprint of the certificate you want to export the public key from.

What is the command to retrieve only trusted root certificates with PowerShell?

The command to retrieve only trusted root certificates with PowerShell is:

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Get-ChildItem -Path Cert:\LocalMachine\Root

What is the best way to identify expired certificates with PowerShell?

One way to identify expired certificates with PowerShell is to use the Get-ChildItem cmdlet to retrieve all certificates from the local certificate store, and then filter them based on their expiration date.

Here is an example script that identifies expired certificates using PowerShell:

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# Retrieve all certificates from the local certificate store
$certificates = Get-ChildItem -Path Cert:\LocalMachine\My

# Filter the certificates based on their expiration date
$expiredCertificates = $certificates | Where-Object { $_.NotAfter -lt (Get-Date) }

# Display the expired certificates
$expiredCertificates

This script retrieves all certificates from the local machine's "My" (Personal) certificate store, filters them based on their expiration date, and then displays the expired certificates.

You can modify this script to target different certificate stores and customize the output as needed. Additionally, you can schedule this script to run periodically to regularly check for and identify any newly expired certificates.

How to list certificates with a specific key usage using PowerShell?

You can list certificates with a specific key usage using the following PowerShell cmdlet:

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Get-ChildItem -Path Cert:\LocalMachine\My | Where-Object {$_.Extensions.KeyUsageList -contains "DigitalSignature"}

In this example, we are listing certificates in the LocalMachine\My store that have the key usage DigitalSignature. You can replace "DigitalSignature" with any other key usage that you are interested in.

How to identify self-signed certificates with PowerShell?

You can identify self-signed certificates in PowerShell by checking the issuer and subject of the certificate. Self-signed certificates typically have the same issuer and subject, which can be used as a key indicator.

Here is an example PowerShell script to identify self-signed certificates:

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# Get all certificates from the local machine store
$certs = Get-ChildItem -Path Cert:\LocalMachine\My

foreach ($cert in $certs) {
    # Check if the issuer is the same as the subject
    if ($cert.Issuer -eq $cert.Subject) {
        Write-Output "Self-signed certificate found:"
        Write-Output "Subject: $($cert.Subject)"
        Write-Output "Thumbprint: $($cert.Thumbprint)"
    }
}

This script will list all self-signed certificates in the Local Machine\Personal store on the system. You can modify the script to check other certificate stores or criteria as needed.