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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.

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llSuccess = .F.

// 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).
loCert = createobject("CkCert")
llSuccess = loCert.LoadFromFile("qa_data/certs/myCert.cer")
if (llSuccess = .F.) then
    ? loCert.LastErrorText
    release loCert
    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.
loJsonAwsKms = createobject("CkJsonObject")
// Set the "service" equal to "aws_kms" to tell Chilkat to use AWS KMS for signing.
loJsonAwsKms.UpdateString("service","aws_kms")
loJsonAwsKms.UpdateString("access_key","ACCESS_KEY")
loJsonAwsKms.UpdateString("secret_key","SECRET_KEY")
// Make sure to specify the correct region for your case.
loJsonAwsKms.UpdateString("region","us-west-2")
// In the above screenshot, our key ID is "187012e8-008f-4fc7-b100-5efe6146dff2".  You will use your key ID.
loJsonAwsKms.UpdateString("key_id","187012e8-008f-4fc7-b100-5efe6146dff2")

llSuccess = loCert.SetCloudSigner(loJsonAwsKms)

loCrypt = createobject("CkCrypt2")

llSuccess = loCrypt.SetSigningCert(loCert)
if (llSuccess = .F.) then
    ? loCrypt.LastErrorText
    release loCert
    release loJsonAwsKms
    release loCrypt
    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.
loCrypt.CadesEnabled = .T.

loCrypt.HashAlgorithm = "sha256"

loSignedAttrs = createobject("CkJsonObject")
loSignedAttrs.UpdateInt("contentType",1)
loSignedAttrs.UpdateInt("signingTime",1)
loSignedAttrs.UpdateInt("messageDigest",1)
loSignedAttrs.UpdateInt("signingCertificateV2",1)
loCrypt.SigningAttributes = loSignedAttrs.Emit()

// You can sign any type of file..
lcInputXmlPath = "qa_data/e-Invoice.xml"
lcOutputP7mPath = "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.
llSuccess = loCrypt.CreateP7M(lcInputXmlPath,lcOutputP7mPath)
if (llSuccess = .F.) then
    ? loCrypt.LastErrorText
    release loCert
    release loJsonAwsKms
    release loCrypt
    release loSignedAttrs
    return
endif

? "Success."


release loCert
release loJsonAwsKms
release loCrypt
release loSignedAttrs