Rust Requires Chilkat v11.0.0+

Azure Key Vault Sign with a Certificate's Private Key

See more Azure Key Vault Examples

Signs a hash using the private key of a certificate previously imported to an Azure Key Vault. Rust

// This requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

// See Azure Key Vault Get Certificates for a more detailed explanation
// for how Chilkat is automatically getting the OAuth2 access token for your application.

// Provide information needed for Chilkat to automatically get an OAuth2 access token as needed.
let json = chilkat::JsonObject::new();
let _ = json.update_string("client_id", "APP_ID");
let _ = json.update_string("client_secret", "APP_PASSWORD");
let _ = json.update_string("resource", "https://vault.azure.net");
let _ = json.update_string("token_endpoint", "https://login.microsoftonline.com/TENANT_ID/oauth2/token");

// In this example, we'll sign the SHA256 hash of the string "This is a test"
let sb = chilkat::StringBuilder::new();
let signed_string = "This is a test".to_string();
let _ = sb.append(&signed_string);
let hash_base64url = sb.get_hash("sha256", "base64url", "utf-8").unwrap_or_default();

// We're going to send a POST to the following URL:
// POST {vaultBaseUrl}/keys/{key-or-cert-name}/{key-or-cert-version}/sign?api-version=7.4

// For example:

// POST https://VAULT_NAME.vault.azure.net/keys/CERT_NAME/CERT_VERSION/sign?api-version=7.4
// 
// {
//   "alg": "RS512",
//   "value": "RUE3Nzg4NTQ4QjQ5RjFFN0U2NzAyQzhDNEMwMkJDOTA1MTYyOTUzNjI5NDhBNzZDQTlFOTM1NDA2M0ZGMjk2Mg"
// }

// The alg can be one of the following
// ES256  ECDSA using P-256 and SHA-256
// ES256K ECDSA using P-256K and SHA-256
// ES384  ECDSA using P-384 and SHA-384
// ES512  ECDSA using P-521 and SHA-512
// PS256  RSASSA-PSS using SHA-256 and MGF1 with SHA-256
// PS384  RSASSA-PSS using SHA-384 and MGF1 with SHA-384
// PS512  RSASSA-PSS using SHA-512 and MGF1 with SHA-512
// RS256  RSASSA-PKCS1-v1_5 using SHA-256
// RS384  RSASSA-PKCS1-v1_5 using SHA-384
// RS512  RSASSA-PKCS1-v1_5 using SHA-512

// The sample POST above uses SHA512.  We'll instead sign a SHA256 hash..

let json_body = chilkat::JsonObject::new();
let _ = json_body.update_string("alg", "RS256");
let _ = json_body.update_string("value", &hash_base64url);

let http = chilkat::Http::new();

// Instead of providing an actual access token, we give Chilkat the information that allows it to 
// automatically fetch the access token using the OAuth2 client credentials flow.
http.set_auth_token(&json.emit().unwrap_or_default());

let _ = http.set_url_var("certName", "importCert01");
let _ = http.set_url_var("certVersion", "7140c8755ed14839b5d86a9f7e7f0497");
// Note: Replace "VAULT_NAME" with the name of your Azure key vault.
let url = "https://VAULT_NAME.vault.azure.net/keys/{$certName}/{$certVersion}/sign?api-version=7.4".to_string();
let resp = chilkat::HttpResponse::new();
if http.http_json("POST", &url, &json_body, "application/json", &resp).is_err() {
    println!("{}", http.last_error_text());
    return;
}

let status_code = resp.status_code();

let json_resp = chilkat::JsonObject::new();
let _ = resp.get_body_json(&json_resp);

json_resp.set_emit_compact(false);
println!("{}", json_resp.emit().unwrap_or_default());

if status_code != 200 {
    println!("Failed.");
    return;
}

// A successful response body contains JSON like this:
// Note: Azure's documentation is not very clear, but base64url is the encoding, not "base64".
// {
//   "kid": "https://kvchilkat.vault.azure.net/keys/importCert01/7140c8755ed14839b5d86a9f7e7f0497",
//   "value": "JzWd2YF21gjtW ... Em37hKOQ"
// }

// Let's validate the signature using the cert's public key.
// This example will load the corresponding certificate from a local file and will verify the signature against the original data.
// 
let cert = chilkat::Cert::new();
if cert.load_from_file("qa_data/certs/chilkat_code_signing_2024.cer").is_err() {
    println!("{}", cert.last_error_text());
    return;
}

let rsa = chilkat::Rsa::new();
// Tell the RSA object to use the cert's public key.
if rsa.set_x509_cert(&cert, false).is_err() {
    println!("{}", rsa.last_error_text());
    return;
}

// Verify the signature using the cert's public key against the original string.
rsa.set_encoding_mode("base64url");
let valid = rsa.verify_string_enc(&signed_string, "sha-256", &json_resp.string_of("value").unwrap_or_default()).is_ok();
println!("signature valid = {}", valid);