Go

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.

Go

    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).
    cert := chilkat.NewCert()
    success = cert.LoadFromFile("qa_data/certs/myCert.cer")
    if success == false {
        fmt.Println(cert.LastErrorText())
        cert.DisposeCert()
        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.
    jsonAwsKms := chilkat.NewJsonObject()
    // 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)

    crypt := chilkat.NewCrypt2()

    success = crypt.SetSigningCert(cert)
    if success == false {
        fmt.Println(crypt.LastErrorText())
        cert.DisposeCert()
        jsonAwsKms.DisposeJsonObject()
        crypt.DisposeCrypt2()
        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.SetCadesEnabled(true)

    crypt.SetHashAlgorithm("sha256")

    signedAttrs := chilkat.NewJsonObject()
    signedAttrs.UpdateInt("contentType",1)
    signedAttrs.UpdateInt("signingTime",1)
    signedAttrs.UpdateInt("messageDigest",1)
    signedAttrs.UpdateInt("signingCertificateV2",1)
    crypt.SetSigningAttributes(signedAttrs.Emit())

    // You can sign any type of file..
    inputXmlPath := "qa_data/e-Invoice.xml"
    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 {
        fmt.Println(crypt.LastErrorText())
        cert.DisposeCert()
        jsonAwsKms.DisposeJsonObject()
        crypt.DisposeCrypt2()
        signedAttrs.DisposeJsonObject()
        return
    }

    fmt.Println("Success.")

    cert.DisposeCert()
    jsonAwsKms.DisposeJsonObject()
    crypt.DisposeCrypt2()
    signedAttrs.DisposeJsonObject()