PHP Extension Requires Chilkat v11.0.0+

SII Chile - FRMA Signature Computation and Add to XML

See more XML Digital Signatures Examples

Compute the FRMA signature of a <DA> element enclosed inside a <CAF> element of the XML to be signed. PHP Extension

<?php

include("chilkat.php");

$success = false;

//  This example assumes the Chilkat API to have been previously unlocked.
//  See Global Unlock Sample for sample code.

//  Also see:  Compute the FRMT Signature and Add to XML

$xml = new CkXml();

//  Load the unsigned XML that contains the following:

//  <DTE version="1.0">
//    <Documento ID="F60T33">
//          <TED version="1.0">
//              <DD>
//  		...
//                  <CAF version="1.0">
//                      <DA>
//  			...
//                      </DA>
//  			... The FRMA will be added here ...
//                  </CAF>
//                  ...
//              </DD>
//              ... The FRMT will be added here in another example ...
//          </TED>
//    </Documento>
//  </DTE>

$success = $xml->LoadXmlFile('qa_data/xml_dsig/sii_cl/test_0.xml');
if ($success == false) {
    print 'Failed to load initial XML file.' . "\n";
    exit;
}

//  Get a reference to the "DA" element
// daXml is a CkXml
$daXml = $xml->FindChild('Documento|TED|DD|CAF|DA');
if ($xml->get_LastMethodSuccess() == false) {
    print 'Failed to find DA element' . "\n";
    exit;
}

//   We need to get the "flattened" DA XML where:
//     - No whitespace between elements.
//     - The 5 pre-defined entities are converted.
//     - The text is encoded in the ISO-8859-1 character set (Latin-1), 
$sbFlattened = new CkStringBuilder();
$daXml->put_EmitCompact(true);
$daXml->put_EmitXmlDecl(false);
$daXml->GetXmlSb($sbFlattened);

//  Compute the SHA-1 message digest of the iso-8859-1 byte representation, 
//  and sign it with our RSA private key, getting the result in base64 format.

$privKey = new CkPrivateKey();
$success = $privKey->LoadAnyFormatFile('qa_data/rsa/rsaPrivKey_pkcs8.pem','');
if ($success == false) {
    print $privKey->lastErrorText() . "\n";
    exit;
}

$rsa = new CkRsa();
$rsa->UsePrivateKey($privKey);

$rsa->put_EncodingMode('base64');
$rsa->put_Charset('iso-8859-1');
$sig = $rsa->signStringENC($sbFlattened->getAsString(),'sha1');

//  Add the FRMA signature element to the XML.
$xml->UpdateChildContent('Documento|TED|DD|CAF|FRMA',$sig);
$xml->UpdateAttrAt('Documento|TED|DD|CAF|FRMA',true,'algoritmo','SHA1withRSA');

//  See what we have:
$xml->put_EmitCompact(false);
$xml->put_EmitXmlDecl(true);
print $xml->getXml() . "\n";

$xml->SaveXml('qa_data/xml_dsig/sii_cl/test_1.xml');

?>