public async Task GetKeysAsync() { // Environment variable with the Key Vault endpoint. string keyVaultUrl = Environment.GetEnvironmentVariable("AZURE_KEYVAULT_URL"); // Instantiate a key 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 KeyClient(new Uri(keyVaultUrl), new DefaultAzureCredential()); // Let's create EC and RSA keys valid for 1 year. If the key // already exists in the Key Vault, then a new version of the key is created. string rsaKeyName = $"CloudRsaKey-{Guid.NewGuid()}"; var rsaKey = new CreateRsaKeyOptions(rsaKeyName, hardwareProtected: false) { KeySize = 2048, ExpiresOn = DateTimeOffset.Now.AddYears(1) }; await client.CreateRsaKeyAsync(rsaKey); string ecKeyName = $"CloudECKey-{Guid.NewGuid()}"; var ecKey = new CreateEcKeyOptions(ecKeyName, hardwareProtected: false) { ExpiresOn = DateTimeOffset.Now.AddYears(1) }; await client.CreateEcKeyAsync(ecKey); // You need to check the type of keys that already exist in your Key Vault. // Let's list the keys and print their types. // List operations don't return the actual key, but only properties of the key. // So, for each returned key we call GetKey to get the actual key. await foreach (KeyProperties key in client.GetPropertiesOfKeysAsync()) { KeyVaultKey keyWithType = await client.GetKeyAsync(key.Name); Debug.WriteLine($"Key is returned with name {keyWithType.Name} and type {keyWithType.KeyType}"); } // We need the Cloud RSA key with bigger key size, so you want to update the key in Key Vault to ensure // it has the required size. // Calling CreateRsaKey on an existing key creates a new version of the key in the Key Vault // with the new specified size. var newRsaKey = new CreateRsaKeyOptions(rsaKeyName, hardwareProtected: false) { KeySize = 4096, ExpiresOn = DateTimeOffset.Now.AddYears(1) }; await client.CreateRsaKeyAsync(newRsaKey); // You need to check all the different versions Cloud RSA key had previously. // Lets print all the versions of this key. await foreach (KeyProperties key in client.GetPropertiesOfKeyVersionsAsync(rsaKeyName)) { Debug.WriteLine($"Key's version {key.Version} with name {key.Name}"); } // The Cloud RSA Key and the Cloud EC Key are no longer needed. // You need to delete them from the Key Vault. DeleteKeyOperation rsaKeyOperation = await client.StartDeleteKeyAsync(rsaKeyName); DeleteKeyOperation ecKeyOperation = await client.StartDeleteKeyAsync(ecKeyName); // You only need to wait for completion if you want to purge or recover the key. await Task.WhenAll( rsaKeyOperation.WaitForCompletionAsync().AsTask(), ecKeyOperation.WaitForCompletionAsync().AsTask()); // You can list all the deleted and non-purged keys, assuming Key Vault is soft-delete enabled. await foreach (DeletedKey key in client.GetDeletedKeysAsync()) { Debug.WriteLine($"Deleted key's recovery Id {key.RecoveryId}"); } // If the keyvault is soft-delete enabled, then for permanent deletion, deleted keys needs to be purged. await Task.WhenAll( client.PurgeDeletedKeyAsync(rsaKeyName), client.PurgeDeletedKeyAsync(ecKeyName)); }