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(.NET Core C#) Get a Certificate's Key SizeDemonstrates how to get the RSA key size of a certificate (for example, 1024-bit, 2048-bit, etc.)
// For this example, I have a certificate in raw base64 format (not PEM), // that looks like this: "MIIGkDCCBHigAwIBAgIUMDA ... s/iqLsLA==" Chilkat.StringBuilder sbCertBase64 = new Chilkat.StringBuilder(); bool success = sbCertBase64.LoadFile("qa_data/certs/base64Cert.txt","utf-8"); Chilkat.Cert cert = new Chilkat.Cert(); success = cert.LoadFromBase64(sbCertBase64.GetAsString()); if (success != true) { Debug.WriteLine(cert.LastErrorText); return; } // Get the public key. Chilkat.PublicKey pubKey = cert.ExportPublicKey(); if (cert.LastMethodSuccess != true) { Debug.WriteLine(cert.LastErrorText); return; } // In Chilkat version v9.5.0.67, the KeySize property was added. int numBits = pubKey.KeySize; Debug.WriteLine("Number of bits = " + Convert.ToString(numBits)); // If using an older version of Chilkat, the key size can be obtained like this: Chilkat.Xml xml = new Chilkat.Xml(); xml.LoadXml(pubKey.GetXml()); Chilkat.BinData binDat = new Chilkat.BinData(); binDat.AppendEncoded(xml.GetChildContent("Modulus"),"base64"); numBits = 8 * binDat.NumBytes; Debug.WriteLine("Number of bits = " + Convert.ToString(numBits)); |
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