(Java) Create CAdES p7m using AWS KMS to Sign in the Cloud

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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.

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import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    // 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).
    CkCert cert = new CkCert();
    boolean success = cert.LoadFromFile("qa_data/certs/myCert.cer");
    if (success == false) {
        System.out.println(cert.lastErrorText());
        return;
        }

    // Here's a screenshot showing the key ID of a private key in AWS KMS:
    

    // 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.
    CkJsonObject jsonAwsKms = new CkJsonObject();
    // Set the "service" equal to "aws_kms" to tell Chilkat to use AWS KMS for signing.
    jsonAwsKms.UpdateString("service","aws_kms");
    jsonAwsKms.UpdateString("access_key","ACCESS_KEY");
    jsonAwsKms.UpdateString("secret_key","SECRET_KEY");
    // Make sure to specify the correct region for your case.
    jsonAwsKms.UpdateString("region","us-west-2");
    // In the above screenshot, our key ID is "187012e8-008f-4fc7-b100-5efe6146dff2".  You will use your key ID.
    jsonAwsKms.UpdateString("key_id","187012e8-008f-4fc7-b100-5efe6146dff2");

    success = cert.SetCloudSigner(jsonAwsKms);

    CkCrypt2 crypt = new CkCrypt2();

    success = crypt.SetSigningCert(cert);
    if (success == false) {
        System.out.println(crypt.lastErrorText());
        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.put_CadesEnabled(true);

    crypt.put_HashAlgorithm("sha256");

    CkJsonObject signedAttrs = new CkJsonObject();
    signedAttrs.UpdateInt("contentType",1);
    signedAttrs.UpdateInt("signingTime",1);
    signedAttrs.UpdateInt("messageDigest",1);
    signedAttrs.UpdateInt("signingCertificateV2",1);
    crypt.put_SigningAttributes(signedAttrs.emit());

    // You can sign any type of file..
    String inputXmlPath = "qa_data/e-Invoice.xml";
    String outputP7mPath = "qa_output/signed.p7m";

    // 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.
    success = crypt.CreateP7M(inputXmlPath,outputP7mPath);
    if (success == false) {
        System.out.println(crypt.lastErrorText());
        return;
        }

    System.out.println("Success.");
  }
}