DataFlex

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.

DataFlex

Use ChilkatAx-win32.pkg

Procedure Test
    Boolean iSuccess
    Variant vCert
    Handle hoCert
    Variant vJsonAwsKms
    Handle hoJsonAwsKms
    Handle hoCrypt
    Handle hoSignedAttrs
    String sInputXmlPath
    String sOutputP7mPath
    String sTemp1

    Move False To iSuccess

    // 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).
    Get Create (RefClass(cComChilkatCert)) To hoCert
    If (Not(IsComObjectCreated(hoCert))) Begin
        Send CreateComObject of hoCert
    End
    Get ComLoadFromFile Of hoCert "qa_data/certs/myCert.cer" To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoCert To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // 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.
    Get Create (RefClass(cComChilkatJsonObject)) To hoJsonAwsKms
    If (Not(IsComObjectCreated(hoJsonAwsKms))) Begin
        Send CreateComObject of hoJsonAwsKms
    End
    // Set the "service" equal to "aws_kms" to tell Chilkat to use AWS KMS for signing.
    Get ComUpdateString Of hoJsonAwsKms "service" "aws_kms" To iSuccess
    Get ComUpdateString Of hoJsonAwsKms "access_key" "ACCESS_KEY" To iSuccess
    Get ComUpdateString Of hoJsonAwsKms "secret_key" "SECRET_KEY" To iSuccess
    // Make sure to specify the correct region for your case.
    Get ComUpdateString Of hoJsonAwsKms "region" "us-west-2" To iSuccess
    // In the above screenshot, our key ID is "187012e8-008f-4fc7-b100-5efe6146dff2".  You will use your key ID.
    Get ComUpdateString Of hoJsonAwsKms "key_id" "187012e8-008f-4fc7-b100-5efe6146dff2" To iSuccess

    Get pvComObject of hoJsonAwsKms to vJsonAwsKms
    Get ComSetCloudSigner Of hoCert vJsonAwsKms To iSuccess

    Get Create (RefClass(cComChilkatCrypt2)) To hoCrypt
    If (Not(IsComObjectCreated(hoCrypt))) Begin
        Send CreateComObject of hoCrypt
    End

    Get pvComObject of hoCert to vCert
    Get ComSetSigningCert Of hoCrypt vCert To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoCrypt To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // The CadesEnabled property applies to all methods that create PKCS7 signatures. 
    // To create a CAdES-BES signature, set this property equal to true.
    Set ComCadesEnabled Of hoCrypt To True

    Set ComHashAlgorithm Of hoCrypt To "sha256"

    Get Create (RefClass(cComChilkatJsonObject)) To hoSignedAttrs
    If (Not(IsComObjectCreated(hoSignedAttrs))) Begin
        Send CreateComObject of hoSignedAttrs
    End
    Get ComUpdateInt Of hoSignedAttrs "contentType" 1 To iSuccess
    Get ComUpdateInt Of hoSignedAttrs "signingTime" 1 To iSuccess
    Get ComUpdateInt Of hoSignedAttrs "messageDigest" 1 To iSuccess
    Get ComUpdateInt Of hoSignedAttrs "signingCertificateV2" 1 To iSuccess
    Get ComEmit Of hoSignedAttrs To sTemp1
    Set ComSigningAttributes Of hoCrypt To sTemp1

    // You can sign any type of file..
    Move "qa_data/e-Invoice.xml" To sInputXmlPath
    Move "qa_output/signed.p7m" To sOutputP7mPath

    // 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.
    Get ComCreateP7M Of hoCrypt sInputXmlPath sOutputP7mPath To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoCrypt To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Showln "Success."


End_Procedure