public void HelloWorldSync()
{
// Environment variable with the Key Vault endpoint.
string keyVaultUrl = Environment.GetEnvironmentVariable("AZURE_KEYVAULT_URL");
// Instantiate a certificate client that will be used to call the service. Notice that the client is using
// default Azure credentials. To make default credentials work, ensure that environment variables 'AZURE_CLIENT_ID',
// 'AZURE_CLIENT_KEY' and 'AZURE_TENANT_ID' are set with the service principal credentials.
var client = new CertificateClient(new Uri(keyVaultUrl), new DefaultAzureCredential());
// Let's create a self signed certifiate using the default policy. If the certificiate
// already exists in the Key Vault, then a new version of the key is created.
string certName = $"defaultCert-{Guid.NewGuid()}";
CertificateOperation certOp = client.StartCreateCertificate(certName);
// Next let's wait on the certificate operation to complete. Note that certificate creation can last an indeterministic
// amount of time, so applications should only wait on the operation to complete in the case the issuance time is well
// known and within the scope of the application lifetime. In this case we are creating a self-signed certificate which
// should be issued in a relatively short amount of time.
while (!certOp.HasCompleted)
{
certOp.UpdateStatus();
Thread.Sleep(certOp.PollingInterval);
}
// Let's get the created certificate along with it's policy from the Key Vault.
CertificateWithPolicy certificate = client.GetCertificateWithPolicy(certName);
Debug.WriteLine($"Certificate was returned with name {certificate.Name} which expires {certificate.Properties.Expires}");
// We find that the certificate has been compromised and we want to disable it so applications will no longer be able
// to access the compromised version of the certificate.
Certificate updatedCert = client.UpdateCertificate(certName, certificate.Version, enabled: false);
Debug.WriteLine($"Certificate enabled set to '{updatedCert.Properties.Enabled}'");
// We need to create a new version of the certificate that applications can use to replace the compromised certificate.
// Creating a certificate with the same name and policy as the compromised certificate will create another version of the
// certificate with similar properties to the original certificate
CertificateOperation newCertOp = client.StartCreateCertificate(certificate.Name, certificate.Policy);
while (!newCertOp.HasCompleted)
{
newCertOp.UpdateStatus();
Thread.Sleep(newCertOp.PollingInterval);
}
// The certificate is no longer needed, need to delete it from the Key Vault.
client.DeleteCertificate(certName);
// To ensure certificate is deleted on server side.
Assert.IsTrue(WaitForDeletedCertificate(client, certName));
// If the keyvault is soft-delete enabled, then for permanent deletion, deleted certificate needs to be purged.
client.PurgeDeletedCertificate(certName);
}