Rust

Create CAdES p7m using AWS KMS to Sign in the Cloud

See more Signing in the Cloud Examples

Demonstrates how to create a CAdES p7m, using AWS KMS. The signing of the hash happens in the Cloud on AWS KMS. Everything else regarding the creation of CAdES happens locally within Chilkat.

Note: This example requires Chilkat v9.5.0.96 or greater.

Rust

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

// Load the certificate used for signing.  The certificate's private key is stored in AWS KMS
// However, we still need the certificate locally (without private key).
let cert = chilkat::Cert::new();
if cert.load_from_file("qa_data/certs/myCert.cer").is_err() {
    println!("{}", cert.last_error_text());
    return;
}

// Here's a screenshot showing the key ID of a private key in AWS KMS:
// (image:https://example-code.com/images/aws_kms.jpg/endImage)

// To sign using AWS KMS, 
// add the following lines of code to specify your AWS authentication credentials,
// and the ID of the KMS private key.
let json_aws_kms = chilkat::JsonObject::new();
// Set the "service" equal to "aws_kms" to tell Chilkat to use AWS KMS for signing.
let _ = json_aws_kms.update_string("service", "aws_kms");
let _ = json_aws_kms.update_string("access_key", "ACCESS_KEY");
let _ = json_aws_kms.update_string("secret_key", "SECRET_KEY");
// Make sure to specify the correct region for your case.
let _ = json_aws_kms.update_string("region", "us-west-2");
// In the above screenshot, our key ID is "187012e8-008f-4fc7-b100-5efe6146dff2".  You will use your key ID.
let _ = json_aws_kms.update_string("key_id", "187012e8-008f-4fc7-b100-5efe6146dff2");

let _ = cert.set_cloud_signer(&json_aws_kms).is_ok();

let crypt = chilkat::Crypt2::new();

if crypt.set_signing_cert(&cert).is_err() {
    println!("{}", crypt.last_error_text());
    return;
}

// The CadesEnabled property applies to all methods that create PKCS7 signatures. 
// To create a CAdES-BES signature, set this property equal to true.
crypt.set_cades_enabled(true);

crypt.set_hash_algorithm("sha256");

let signed_attrs = chilkat::JsonObject::new();
let _ = signed_attrs.update_int("contentType", 1);
let _ = signed_attrs.update_int("signingTime", 1);
let _ = signed_attrs.update_int("messageDigest", 1);
let _ = signed_attrs.update_int("signingCertificateV2", 1);
crypt.set_signing_attributes(&signed_attrs.emit().unwrap_or_default());

// You can sign any type of file..
let input_xml_path = "qa_data/e-Invoice.xml".to_string();
let output_p7m_path = "qa_output/signed.p7m".to_string();

// Create the CAdES-BES attached signature, which contains the original data.
// Chilkat will build the .p7m locally, but will (internally) use ARSS
// to do the RSA signing remotely.
if crypt.create_p7_m(&input_xml_path, &output_p7m_path).is_err() {
    println!("{}", crypt.last_error_text());
    return;
}

println!("Success.");