Node.js

Get a Certificate's Key Size

See more Certificates Examples

Demonstrates how to get the RSA key size of a certificate (for example, 1024-bit, 2048-bit, etc.) Node.js

NODEJS_PRELUDE

function chilkatExample() {

    var success = false;

    // For this example, I have a certificate in raw base64 format (not PEM),
    // that looks like this:  "MIIGkDCCBHigAwIBAgIUMDA ... s/iqLsLA=="
    var sbCertBase64 = new chilkat.StringBuilder();
    success = sbCertBase64.LoadFile("qa_data/certs/base64Cert.txt","utf-8");

    var cert = new chilkat.Cert();
    success = cert.LoadFromBase64(sbCertBase64.GetAsString());
    if (success == false) {
        console.log(cert.LastErrorText);
        return;
    }

    // Get the public key.
    var pubKey = new chilkat.PublicKey();
    cert.GetPublicKey(pubKey);

    var numBits = pubKey.KeySize;
    console.log("Number of bits = " + numBits);

    // If using an older version of Chilkat, the key size can be obtained like this:
    var xml = new chilkat.Xml();
    xml.LoadXml(pubKey.GetXml());

    var binDat = new chilkat.BinData();
    binDat.AppendEncoded(xml.GetChildContent("Modulus"),"base64");

    numBits = 8 * binDat.NumBytes;
    console.log("Number of bits = " + numBits);

}

chilkatExample();