(PHP Extension) 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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<?php

include("chilkat.php");
// Use "chilkat_9_5_0.php" for versions of Chilkat < 10.0.0

// 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).
$cert = new CkCert();
$success = $cert->LoadFromFile('qa_data/certs/myCert.cer');
if ($success == false) {
    print $cert->lastErrorText() . "\n";
    exit;
}

// 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.
$jsonAwsKms = new CkJsonObject();
// 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 = new CkCrypt2();

$success = $crypt->SetSigningCert($cert);
if ($success == false) {
    print $crypt->lastErrorText() . "\n";
    exit;
}

// The CadesEnabled property applies to all methods that create PKCS7 signatures. 
// To create a CAdES-BES signature, set this property equal to true.
$crypt->put_CadesEnabled(true);

$crypt->put_HashAlgorithm('sha256');

$signedAttrs = new CkJsonObject();
$signedAttrs->UpdateInt('contentType',1);
$signedAttrs->UpdateInt('signingTime',1);
$signedAttrs->UpdateInt('messageDigest',1);
$signedAttrs->UpdateInt('signingCertificateV2',1);
$crypt->put_SigningAttributes($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) {
    print $crypt->lastErrorText() . "\n";
    exit;
}

print 'Success.' . "\n";

?>