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(Node.js) Get a Certificate's Key SizeDemonstrates how to get the RSA key size of a certificate (for example, 1024-bit, 2048-bit, etc.) Note: This example requires Chilkat v11.0.0 or greater.
var os = require('os'); if (os.platform() == 'win32') { var chilkat = require('@chilkat/ck-node23-win64'); } else if (os.platform() == 'linux') { if (os.arch() == 'arm') { var chilkat = require('@chilkat/ck-node23-linux-arm'); } else if (os.arch() == 'arm64') { var chilkat = require('@chilkat/ck-node23-linux-arm64'); } else { var chilkat = require('@chilkat/ck-node23-linux-x64'); } } else if (os.platform() == 'darwin') { var chilkat = require('@chilkat/ck-node23-mac-universal'); } 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(); |
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