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# ------------------------------------
# Copyright (c) Microsoft Corporation.
# Licensed under the MIT License.
# ------------------------------------
import asyncio
import os
from azure.keyvault.keys.aio import KeyClient
from azure.identity.aio import DefaultAzureCredential
from azure.core.exceptions import HttpResponseError
# ----------------------------------------------------------------------------------------------------------
# Prerequisites:
# 1. An Azure Key Vault (https://docs.microsoft.com/en-us/azure/key-vault/quick-create-cli)
#
# 2. azure-keyvault-keys and azure-identity libraries (pip install these)
#
# 3. Set Environment variables AZURE_CLIENT_ID, AZURE_TENANT_ID, AZURE_CLIENT_SECRET, VAULT_URL
# (See https://github.com/Azure/azure-sdk-for-python/tree/master/sdk/keyvault/azure-keyvault-keys#authenticate-the-client)
#
# ----------------------------------------------------------------------------------------------------------
# Sample - demonstrates the basic backup and restore operations on a vault(key) resource for Azure Key Vault
#
# 1. Create a key (create_key)
#
# 2. Backup a key (backup_key)
#
# 3. Delete a key (delete_key)
#
# 4. Restore a key (restore_key_backup)
# ----------------------------------------------------------------------------------------------------------
async def run_sample():
# 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_SECRET' and 'AZURE_TENANT_ID' are set with the service principal credentials.
VAULT_URL = os.environ["VAULT_URL"]
credential = DefaultAzureCredential()
client = KeyClient(vault_url=VAULT_URL, credential=credential)
try:
# Let's create a Key of type RSA.
# if the key already exists in the Key Vault, then a new version of the key is created.
print("\n.. Create Key")
key = await client.create_key("keyName", "RSA")
print("Key with name '{0}' created with key type '{1}'".format(key.name, key.key_type))
# Backups are good to have, if in case keys gets deleted accidentally.
# For long term storage, it is ideal to write the backup to a file.
print("\n.. Create a backup for an existing Key")
key_backup = await client.backup_key(key.name)
print("Backup created for key with name '{0}'.".format(key.name))
# The rsa key is no longer in use, so you delete it.
deleted_key = await client.delete_key(key.name)
print("Deleted Key with name '{0}'".format(deleted_key.name))
# In future, if the key is required again, we can use the backup value to restore it in the Key Vault.
print("\n.. Restore the key using the backed up key bytes")
key = await client.restore_key_backup(key_backup)
print("Restored Key with name '{0}'".format(key.name))
except HttpResponseError as e:
print("\nrun_sample has caught an error. {0}".format(e.message))
finally:
print("\nrun_sample done")
await credential.close()
await client.close()
if __name__ == "__main__":
try:
loop = asyncio.get_event_loop()
loop.run_until_complete(run_sample())
loop.close()
except Exception as e:
print("Top level Error: {0}".format(str(e)))
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