Xbase++

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.

Xbase++

LOCAL nSuccess
LOCAL oCert
LOCAL oJsonAwsKms
LOCAL oCrypt
LOCAL oSignedAttrs
LOCAL cInputXmlPath
LOCAL cOutputP7mPath

nSuccess := 0

//  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).
oCert := CreateObject("Chilkat.Cert")
nSuccess := oCert:LoadFromFile("qa_data/certs/myCert.cer")
IF (nSuccess == 0)
    ? oCert:LastErrorText
    oCert:destroy()
    RETURN
ENDIF

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

nSuccess := oCert:SetCloudSigner(oJsonAwsKms)

oCrypt := CreateObject("Chilkat.Crypt2")

nSuccess := oCrypt:SetSigningCert(oCert)
IF (nSuccess == 0)
    ? oCrypt:LastErrorText
    oCert:destroy()
    oJsonAwsKms:destroy()
    oCrypt:destroy()
    RETURN
ENDIF

//  The CadesEnabled property applies to all methods that create PKCS7 signatures. 
//  To create a CAdES-BES signature, set this property equal to true.
oCrypt:CadesEnabled := 1

oCrypt:HashAlgorithm := "sha256"

oSignedAttrs := CreateObject("Chilkat.JsonObject")
oSignedAttrs:UpdateInt("contentType", 1)
oSignedAttrs:UpdateInt("signingTime", 1)
oSignedAttrs:UpdateInt("messageDigest", 1)
oSignedAttrs:UpdateInt("signingCertificateV2", 1)
oCrypt:SigningAttributes := oSignedAttrs:Emit()

//  You can sign any type of file..
cInputXmlPath := "qa_data/e-Invoice.xml"
cOutputP7mPath := "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.
nSuccess := oCrypt:CreateP7M(cInputXmlPath, cOutputP7mPath)
IF (nSuccess == 0)
    ? oCrypt:LastErrorText
    oCert:destroy()
    oJsonAwsKms:destroy()
    oCrypt:destroy()
    oSignedAttrs:destroy()
    RETURN
ENDIF

? "Success."

oCert:destroy()
oJsonAwsKms:destroy()
oCrypt:destroy()
oSignedAttrs:destroy()