Generating Keys for Encryption and Decryption.; 3 minutes to read +7; In this article. Creating and managing keys is an important part of the cryptographic process. Symmetric algorithms require the creation of a key and an initialization vector (IV). The key must be kept secret from anyone who should not decrypt your data.
-->An Azure storage account uses credentials comprising an account name and a key. The key is auto-generated and serves as a password, rather than an as a cryptographic key. Key Vault manages storage account keys by storing them as Key Vault secrets.
You can use the Key Vault managed storage account key feature to list (sync) keys with an Azure storage account, and regenerate (rotate) the keys periodically. You can manage keys for both storage accounts and Classic storage accounts.
When you use the managed storage account key feature, consider the following points:
We recommend using Azure Storage integration with Azure Active Directory (Azure AD), Microsoft's cloud-based identity and access management service. Azure AD integration is available for Azure blobs and queues, and provides OAuth2 token-based access to Azure Storage (just like Azure Key Vault).
Azure AD allows you to authenticate your client application by using an application or user identity, instead of storage account credentials. You can use an Azure AD managed identity when you run on Azure. Managed identities remove the need for client authentication and storing credentials in or with your application.
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Azure AD uses role-based access control (RBAC) to manage authorization, which is also supported by Key Vault.
An Azure AD tenant provides each registered application with a service principal. The service principal serves as the Application ID, which is used during authorization setup for access to other Azure resources via RBAC.
Key Vault is a Microsoft application that's pre-registered in all Azure AD tenants. Key Vault is registered under the same Application ID in each Azure cloud.
Tenants | Cloud | Application ID |
---|---|---|
Azure AD | Azure Government | 7e7c393b-45d0-48b1-a35e-2905ddf8183c |
Azure AD | Azure public | cfa8b339-82a2-471a-a3c9-0fc0be7a4093 |
Other | Any | cfa8b339-82a2-471a-a3c9-0fc0be7a4093 |
To complete this guide, you must first do the following:
Authenticate your Azure CLI session using the az login commands.
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Use the Azure CLI az role assignment create command to give Key Vault access your storage account. Provide the command the following parameter values:
--role
: Pass the 'Storage Account Key Operator Service Role' RBAC role. This role limits the access scope to your storage account. For a classic storage account, pass 'Classic Storage Account Key Operator Service Role' instead.--assignee-object-id
: Pass the value '93c27d83-f79b-4cb2-8dd4-4aa716542e74', which is the Object ID for Key Vault in the Azure public cloud. (To get the Object ID for Key Vault in the Azure Government cloud, see Service principal application ID.)--scope
: Pass your storage account resource ID, which is in the form /subscriptions/<subscriptionID>/resourceGroups/<StorageAccountResourceGroupName>/providers/Microsoft.Storage/storageAccounts/<YourStorageAccountName>
. To find your subscription ID, use the Azure CLI az account list command; to find your storage account name and storage account resource group, use the Azure CLI az storage account list command.Create a Key Vault managed storage account using the Azure CLI az keyvault storage command. Set a regeneration period of 90 days. After 90 days, Key Vault regenerates key1
and swaps the active key from key2
to key1
. key1
is then marked as the active key. Provide the command the following parameter values:
--vault-name
: Pass the name of your key vault. To find the name of your key vault, use the Azure CLI az keyvault list command.-n
: Pass the name of your storage account. To find the name of your storage account, use the Azure CLI az storage account list command.--resource-id
: Pass your storage account resource ID, which is in the form /subscriptions/<subscriptionID>/resourceGroups/<StorageAccountResourceGroupName>/providers/Microsoft.Storage/storageAccounts/<YourStorageAccountName>
. To find your subscription ID, use the Azure CLI az account list command; to find your storage account name and storage account resource group, use the Azure CLI az storage account list command.You can also ask Key Vault to generate shared access signature tokens. A shared access signature provides delegated access to resources in your storage account. You can grant clients access to resources in your storage account without sharing your account keys. A shared access signature provides you with a secure way to share your storage resources without compromising your account keys.
The commands in this section complete the following actions:
<YourSASDefinitionName>
. The definition is set on a Key Vault managed storage account <YourStorageAccountName>
in your key vault <YourKeyVaultName>
.account
and is valid for N days.Create a shared access signature definition using the Azure CLI az storage account generate-sas command. This operation requires the storage
and setsas
permissions.
After the operation runs successfully, copy the output.
This output will be the passed to the --template-id
parameter in the next step.
Use the the Azure CLI az keyvault storage sas-definition create command, passing the output from the previous step to the --template-id
parameter, to create a shared access signature definition. You can provide the name of your choice to the -n
parameter.
You can verify that the shared access signature definition has been stored in your key vault using the Azure CLI az keyvault secret list and az keyvault secret show commands.
First, find the shared access signature definition in your key vault using the az keyvault secret list command.
The secret corresponding to your SAS definition will have these properties:
You can now use the az keyvault secret show command and the id
property to view the content of that secret.
The output of this command will show your SAS definition string asvalue
.