Node.js

Sign a Byte Array to Create an Opaque Signature in a Byte Array

See more Digital Signatures Examples

Signs data contained in a byte array to produce an opaque signature (also in a byte array). An opaque signature is a PKCS7 signature (also known as CAdES) that embeds the signed data. Also shows how to verify the signature and extract the original data. 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.

    var cert = new chilkat.Cert();
    success = cert.LoadPfxFile("qa_data/pfx/cert_test123.pfx","test123");
    if (success == false) {
        console.log(cert.LastErrorText);
        return;
    }

    var fac = new chilkat.FileAccess();

    fileBytes = fac.ReadEntireFile("qa_data/pdf/sample.pdf");
    if (fac.LastMethodSuccess !== true) {
        console.log(fac.LastErrorText);
        return;
    }

    var crypt = new chilkat.Crypt2();

    success = crypt.SetSigningCert(cert);

    //  We can sign any type of file.

    sigBytes = crypt.OpaqueSignBytes(fileBytes);
    if (crypt.LastMethodSuccess !== true) {
        console.log(crypt.LastErrorText);
        return;
    }

    success = fac.WriteEntireFile("qa_output/sample.pdf.p7m",sigBytes);
    if (fac.LastMethodSuccess !== true) {
        console.log(fac.LastErrorText);
        return;
    }

    //  We can verify the opaque signature and extract the original data like this

    originalData = crypt.OpaqueVerifyBytes(sigBytes);
    if (crypt.LastMethodSuccess !== true) {
        console.log(crypt.LastErrorText);
        return;
    }

    success = fac.WriteEntireFile("qa_output/sample.pdf",originalData);
    if (fac.LastMethodSuccess !== true) {
        console.log(fac.LastErrorText);
        return;
    }

    console.log("Signature is verified and the original data was extracted.");

}

chilkatExample();