Unicode C++

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.

Unicode C++

#include <CkCertW.h>
#include <CkJsonObjectW.h>
#include <CkCrypt2W.h>

void ChilkatSample(void)
    {
    bool success = false;

    // 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).
    CkCertW cert;
    success = cert.LoadFromFile(L"qa_data/certs/myCert.cer");
    if (success == false) {
        wprintf(L"%s\n",cert.lastErrorText());
        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.
    CkJsonObjectW jsonAwsKms;
    // Set the "service" equal to "aws_kms" to tell Chilkat to use AWS KMS for signing.
    jsonAwsKms.UpdateString(L"service",L"aws_kms");
    jsonAwsKms.UpdateString(L"access_key",L"ACCESS_KEY");
    jsonAwsKms.UpdateString(L"secret_key",L"SECRET_KEY");
    // Make sure to specify the correct region for your case.
    jsonAwsKms.UpdateString(L"region",L"us-west-2");
    // In the above screenshot, our key ID is "187012e8-008f-4fc7-b100-5efe6146dff2".  You will use your key ID.
    jsonAwsKms.UpdateString(L"key_id",L"187012e8-008f-4fc7-b100-5efe6146dff2");

    success = cert.SetCloudSigner(jsonAwsKms);

    CkCrypt2W crypt;

    success = crypt.SetSigningCert(cert);
    if (success == false) {
        wprintf(L"%s\n",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(L"sha256");

    CkJsonObjectW signedAttrs;
    signedAttrs.UpdateInt(L"contentType",1);
    signedAttrs.UpdateInt(L"signingTime",1);
    signedAttrs.UpdateInt(L"messageDigest",1);
    signedAttrs.UpdateInt(L"signingCertificateV2",1);
    crypt.put_SigningAttributes(signedAttrs.emit());

    // You can sign any type of file..
    const wchar_t *inputXmlPath = L"qa_data/e-Invoice.xml";
    const wchar_t *outputP7mPath = L"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) {
        wprintf(L"%s\n",crypt.lastErrorText());
        return;
    }

    wprintf(L"Success.\n");
    }