Node.js

Verify Opaque Signature and Retrieve Signing Certificates

See more Digital Signatures Examples

Demonstrates how to verify a PCKS7 opaque digital signature (signed data), extract the original file/data, and then extract the certificate(s) that were used to sign. Node.js

NODEJS_PRELUDE

function chilkatExample() {

    var success = false;

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

    var crypt = new chilkat.Crypt2();

    // Verify a PKCS7 signed-data (opaque signature) file and extract the original content to a file.
    success = crypt.VerifyP7M("qa_data/p7m/opaqueSig.p7","qa_output/originalData.dat");
    if (success == false) {
        console.log(crypt.LastErrorText);
        return;
    }

    // Alternatively, we can do it in memory...
    var binData = new chilkat.BinData();
    success = binData.LoadFile("qa_data/p7m/opaqueSig.p7");
    // Your app should check for success, but we'll skip the check for brevity..

    // If verified, the signature is unwrapped and binData is replaced with the original data that was signed.
    success = crypt.OpaqueVerifyBd(binData);
    if (success == false) {
        console.log(crypt.LastErrorText);
        return;
    }

    // For our testing, we signed some text, so we can get it from the binData..
    console.log("Original Data:");
    console.log(binData.GetString("utf-8"));

    // After any method call that verifies a signature, the crypt object will contain the certificate(s)
    // that were used for signing (assuming the X.509 certs were available in the signature, which is typically the case).

    // Get each signing certificate, and build the certificate chain for each.
    var cert = new chilkat.Cert();
    var certChain = new chilkat.CertChain();
    var numCerts = crypt.NumSignerCerts;
    var i = 0;
    while (i < numCerts) {
        crypt.LastSignerCert(i,cert);
        console.log(cert.SubjectDN);

        success = cert.BuildCertChain(certChain);
        if (success == false) {
            console.log(cert.LastErrorText);
            return;
        }

        i = i+1;
    }


}

chilkatExample();