(Node.js) CoSign PKCS7/CMS Signed Data

See more Digital Signatures Examples

Demonstrates how to add a 2nd signature to a CMS SignedData. This is to add an additional signature, SignerInfo and certificate(s) to an existing CMS signed data.

In this example, we cosign an existing pdf.p7s

Note: The CoSign method is added in Chilkat v9.5.0.89.

Install Chilkat for Node.js and Electron using npm at Chilkat npm packages for Node.js Chilkat npm packages for Electron on Windows, Linux, MacOSX, and ARM

var os = require('os');
if (os.platform() == 'win32') {  
    if (os.arch() == 'ia32') {
        var chilkat = require('@chilkat/ck-node21-win-ia32');
    } else {
        var chilkat = require('@chilkat/ck-node21-win64'); 
    }
} else if (os.platform() == 'linux') {
    if (os.arch() == 'arm') {
        var chilkat = require('@chilkat/ck-node21-arm');
    } else if (os.arch() == 'x86') {
        var chilkat = require('@chilkat/ck-node21-linux32');
    } else {
        var chilkat = require('@chilkat/ck-node21-linux64');
    }
} else if (os.platform() == 'darwin') {
    if (os.arch() == 'arm64') {
        var chilkat = require('@chilkat/ck-node21-mac-m1');
    } else {
        var chilkat = require('@chilkat/ck-node21-macosx');
    }
}

function chilkatExample() {

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

    var crypt = new chilkat.Crypt2();
    var cert = new chilkat.Cert();

    // If loading from a smart card, set the smartcard PIN.
    cert.SmartCardPin = "0000";

    // Load a certificate in some way, such as from a smart card.
    // Chilkat provides other methods to load from a .pfx, .pem, or from the Windows certificate stores..
    var success = cert.LoadFromSmartcard("");
    if (success == false) {
        console.log(cert.LastErrorText);
        return;
    }

    success = crypt.SetSigningCert(cert);
    if (success == false) {
        console.log(crypt.LastErrorText);
        return;
    }

    // Load the file to be co-signed.
    // NOTE:  This is to cosign a PDF file contained within a CMS (PKCS7) message.
    // (In other words, the PDF is contained within the CMS SignedData, rather than the other way around
    // where a CMS signature is contained within a PDF.  Use Chilkat's PDF class to sign a PDF, which is
    // to embed a CMS signature within the PDF.)
    var bd = new chilkat.BinData();
    success = bd.LoadFile("qa_data/p7s/cosign/sample.pdf.p7s");
    if (success == false) {
        console.log("Failed to load pdf.p7s input file.");
        return;
    }

    // bd2 will contain the co-signed result.
    var bd2 = new chilkat.BinData();
    success = crypt.CoSign(bd,cert,bd2);
    if (success == false) {
        console.log(crypt.LastErrorText);
        return;
    }

    success = bd.WriteFile("qa_output/cosigned.pdf.p7s");
    if (success == false) {
        console.log("Failed to save pdf.p7s output file.");
        return;
    }

    console.log("Success!");

}

chilkatExample();