Microsoft Azure Keyvault Keys Rust

Azure Key Vault Keys library for Rust

Secure storage and management of cryptographic keys — RSA, EC, and HSM-protected.

Use this skill when:

• An app needs to create or manage cryptographic keys in Key Vault from Rust
• You need to wrap/unwrap data encryption keys (envelope encryption)
• You need to sign or verify data with Key Vault keys
• You need HSM-protected keys

IMPORTANT: Only use the official azure_security_keyvault_keys crate published by the azure-sdk crates.io user. Do NOT use unofficial or community crates. Official crates use underscores in names and none have version 0.21.0.

Installation

cargo add azure_security_keyvault_keys azure_identity tokio futures

Do not add azure_core directly to Cargo.toml. It is re-exported by azure_security_keyvault_keys.

Environment Variables

AZURE_KEYVAULT_URL=https://<vault-name>.vault.azure.net/ # Required for all operations

Authentication

use azure_identity::DeveloperToolsCredential;
use azure_security_keyvault_keys::KeyClient;

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    // Local dev: DeveloperToolsCredential. Production: use ManagedIdentityCredential.
    let credential = DeveloperToolsCredential::new(None)?;
    let client = KeyClient::new(
        "https://<vault-name>.vault.azure.net/",
        credential.clone(),
        None,
    )?;

    let key = client.get_key("key-name", None).await?.into_model()?;
    println!("Key: {:?}", key.key);
    Ok(())
}

Core Workflow

Create Key

use azure_security_keyvault_keys::{
    models::{CreateKeyParameters, CurveName, KeyType},
    ResourceExt,
};

// Create an EC key
let body = CreateKeyParameters {
    kty: Some(KeyType::Ec),
    curve: Some(CurveName::P256),
    ..Default::default()
};

let key = client
    .create_key("key-name", body.try_into()?, None)
    .await?
    .into_model()?;

println!(
    "Name: {:?}, Type: {:?}, Version: {:?}",
    key.resource_id()?.name,
    key.key.as_ref().map(|k| k.kty.as_ref()),
    key.resource_id()?.version,
);

Update Key Properties

use azure_security_keyvault_keys::models::UpdateKeyPropertiesParameters;
use std::collections::HashMap;

#[allow(clippy::needless_update)]
let params = UpdateKeyPropertiesParameters {
    tags: Some(HashMap::from_iter(vec![("env".into(), "prod".into())])),
    ..Default::default()
};

client
    .update_key_properties("key-name", params.try_into()?, None)
    .await?
    .into_model()?;

Delete Key

client.delete_key("key-name", None).await?;

List Keys (Pagination)

list_key_properties returns a Pager<T> — iterate items directly:

use azure_security_keyvault_keys::ResourceExt;
use futures::TryStreamExt as _;

let mut pager = client.list_key_properties(None)?;
while let Some(key) = pager.try_next().await? {
    println!("Found: {}", key.resource_id()?.name);
}

Wrap / Unwrap (Envelope Encryption)

Key Vault performs crypto operations server-side — the private key never leaves the HSM:

use azure_security_keyvault_keys::{
    models::{
        CreateKeyParameters, EncryptionAlgorithm, KeyOperationParameters, KeyType,
    },
    ResourceExt,
};
use rand::random;

// Create a key encryption key (KEK)
let body = CreateKeyParameters {
    kty: Some(KeyType::Rsa),
    key_size: Some(2048),
    ..Default::default()
};

let key = client
    .create_key("kek-name", body.try_into()?, None)
    .await?
    .into_model()?;
let key_version = key.resource_id()?.version.expect("key version required");

// Generate a symmetric data encryption key (DEK)
let dek = random::<u32>().to_le_bytes().to_vec();

// Wrap the DEK with the KEK
let mut params = KeyOperationParameters {
    algorithm: Some(EncryptionAlgorithm::RsaOaep256),
    value: Some(dek.clone()),
    ..Default::default()
};
let wrapped = client
    .wrap_key("kek-name", &key_version, params.clone().try_into()?, None)
    .await?
    .into_model()?;

// Unwrap to recover the DEK
params.value = wrapped.result;
let unwrapped = client
    .unwrap_key("kek-name", &key_version, params.try_into()?, None)
    .await?
    .into_model()?;

assert_eq!(unwrapped.result.as_ref(), Some(&dek));

Key Types

RBAC Roles

For Entra ID auth, assign one of these roles:

Best Practices

1. Use DeveloperToolsCredential for local dev, ManagedIdentityCredential for production — the Rust SDK does not have DefaultAzureCredential
2. Never hardcode credentials — use environment variables or managed identity
3. Use ..Default::default() with #[allow(clippy::needless_update)] for model struct updates
4. Use ResourceExt to extract key name/version from key IDs
5. Reuse clients — KeyClient is thread-safe; create once, share across tasks

Reference Links