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(Delphi ActiveX) 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.
uses Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics, Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Chilkat_TLB; ... procedure TForm1.Button1Click(Sender: TObject); var success: Integer; sbCertBase64: TChilkatStringBuilder; cert: TChilkatCert; pubKey: TPublicKey; numBits: Integer; xml: TChilkatXml; binDat: TChilkatBinData; begin success := 0; // For this example, I have a certificate in raw base64 format (not PEM), // that looks like this: "MIIGkDCCBHigAwIBAgIUMDA ... s/iqLsLA==" sbCertBase64 := TChilkatStringBuilder.Create(Self); success := sbCertBase64.LoadFile('qa_data/certs/base64Cert.txt','utf-8'); cert := TChilkatCert.Create(Self); success := cert.LoadFromBase64(sbCertBase64.GetAsString()); if (success = 0) then begin Memo1.Lines.Add(cert.LastErrorText); Exit; end; // Get the public key. pubKey := TPublicKey.Create(Self); cert.GetPublicKey(pubKey.ControlInterface); numBits := pubKey.KeySize; Memo1.Lines.Add('Number of bits = ' + IntToStr(numBits)); // If using an older version of Chilkat, the key size can be obtained like this: xml := TChilkatXml.Create(Self); xml.LoadXml(pubKey.GetXml()); binDat := TChilkatBinData.Create(Self); binDat.AppendEncoded(xml.GetChildContent('Modulus'),'base64'); numBits := 8 * binDat.NumBytes; Memo1.Lines.Add('Number of bits = ' + IntToStr(numBits)); end; |
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