Node.js Requires Chilkat v11.7.0+

Replace the Authenticode Signature of an Already Signed File

See more Code Signing Examples

Demonstrates how to sign a file that already has an Authenticode signature, for example to sign it with a renewed code signing certificate. Starting in Chilkat v11.7.0, AddSignature removes the existing signature and replaces it with the new one. Before v11.7.0, signing an already signed EXE or DLL added a second signature entry instead. Node.js

NODEJS_PRELUDE

function chilkatExample() {

    var success = false;

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

    //  Starting in Chilkat v11.7.0, AddSignature replaces the signature of a file that is already signed.
    //  (Before v11.7.0, signing an already signed EXE or DLL added a second signature entry
    //  instead of replacing the first.)
    //  
    //  This applies to every supported file type: EXE, DLL, MSI, PowerShell, and VBScript.

    var path = "C:/someDir/MyApp.exe";

    var codeSign = new chilkat.CodeSign();
    var sigInfo = new chilkat.JsonObject();
    var signerCert = new chilkat.Cert();

    //  Find out who signed the file.
    var valid = codeSign.VerifySignature(path,sigInfo);
    if (valid == true) {
        codeSign.GetSignerCert(signerCert);
        console.log("currently signed by: " + signerCert.SubjectCN);
        console.log("certificate valid until: " + signerCert.ValidToStr);
    }
    else {
        console.log("The file is not signed, or its signature is not valid.");
    }

    //  Load the certificate to sign with.  It must have access to its private key.
    var cert = new chilkat.Cert();
    success = cert.LoadPfxFile("C:/someDir/myNewCodeSigningCert.pfx","pfx password");
    if (success == false) {
        console.log(cert.LastErrorText);
        return;
    }

    //  Sign with SHA256, and ask a timestamp authority for a timestamp.  A timestamp lets the
    //  signature continue to validate after the code signing certificate has expired.
    //  
    //  {
    //    "hashAlg": "sha256",
    //    "timestampToken": {
    //      "enabled": true,
    //      "tsaUrl": "http://timestamp.digicert.com",
    //      "requestTsaCert": true,
    //      "hashAlg": "sha256"
    //    }
    //  }
    var json = new chilkat.JsonObject();
    json.UpdateString("hashAlg","sha256");
    json.UpdateBool("timestampToken.enabled",true);
    json.UpdateString("timestampToken.tsaUrl","http://timestamp.digicert.com");
    json.UpdateBool("timestampToken.requestTsaCert",true);
    json.UpdateString("timestampToken.hashAlg","sha256");

    //  Sign the file.  It is not necessary to call RemoveSignature first:
    //  the existing signature is removed and the new signature takes its place.
    success = codeSign.AddSignature(path,cert,json);
    if (success == false) {
        console.log(codeSign.LastErrorText);
        return;
    }

    //  The file now has one signature, made with the new certificate.
    valid = codeSign.VerifySignature(path,sigInfo);
    if (valid == false) {
        console.log(codeSign.LastErrorText);
        return;
    }

    success = codeSign.GetSignerCert(signerCert);
    if (success == false) {
        console.log(codeSign.LastErrorText);
        return;
    }

    console.log("now signed by: " + signerCert.SubjectCN);
    console.log("certificate valid until: " + signerCert.ValidToStr);

}

chilkatExample();