Update the installed certificate for an Identity Provider

If you use ADFS or some form of federated identity in SharePoint eventually you’re likely to need to update the certificate you have installed. This is because SharePoint holds a copy of the public certificate to verify the incoming SAML Claims tokens. Thankfully it’s reasonably painless and requires no downtime for SharePoint.

Here’s a script I’ve used to get this job done quickly and painlessly.

Add-PSSnapIn Microsoft.SharePoint.PowerShell
$cwd = Resolve-path .
$certPath = Join-Path $cwd "NewCert.cer" 
$cert = New-Object System.Security.Cryptography.X509Certificates.X509Certificate2("$certPath") 
Get-SPTrustedRootAuthority "Trusted Root Authority Name" | Set-SPTrustedRootAuthority -Certificate $cert 
Set-SPTrustedIdentityTokenIssuer -Identity "Trusted Token Issuer Name" -ImportTrustCertificate $cert  
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