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

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

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func chilkatTest() {
    // 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 = CkoCert()!
    var success: Bool = cert.load(fromFile: "qa_data/certs/myCert.cer")
    if success == false {
        print("\(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.
    let jsonAwsKms = CkoJsonObject()!
    // Set the "service" equal to "aws_kms" to tell Chilkat to use AWS KMS for signing.
    jsonAwsKms.update("service", value: "aws_kms")
    jsonAwsKms.update("access_key", value: "ACCESS_KEY")
    jsonAwsKms.update("secret_key", value: "SECRET_KEY")
    // Make sure to specify the correct region for your case.
    jsonAwsKms.update("region", value: "us-west-2")
    // In the above screenshot, our key ID is "187012e8-008f-4fc7-b100-5efe6146dff2".  You will use your key ID.
    jsonAwsKms.update("key_id", value: "187012e8-008f-4fc7-b100-5efe6146dff2")

    success = cert.setCloudSigner(jsonAwsKms)

    let crypt = CkoCrypt2()!

    success = crypt.setSigning(cert)
    if success == false {
        print("\(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.cadesEnabled = true

    crypt.hashAlgorithm = "sha256"

    let signedAttrs = CkoJsonObject()!
    signedAttrs.updateInt("contentType", value: 1)
    signedAttrs.updateInt("signingTime", value: 1)
    signedAttrs.updateInt("messageDigest", value: 1)
    signedAttrs.updateInt("signingCertificateV2", value: 1)
    crypt.signingAttributes = signedAttrs.emit()

    // You can sign any type of file..
    var inputXmlPath: String? = "qa_data/e-Invoice.xml"
    var outputP7mPath: String? = "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, p7mPath: outputP7mPath)
    if success == false {
        print("\(crypt.lastErrorText!)")
        return
    }

    print("Success.")

}