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(Delphi ActiveX) About RSA Public/Private KeysThis example provides some additional information for understanding public/private key pairs. In demonstrates how a private key is a superset of the public key. A public key contains the modulus and exponent. The matching private key also contains the modulus and exponent, but also contains the additional private key parts. 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; cert: TChilkatCert; pubKey: TPublicKey; privKey: TPrivateKey; begin success := 0; cert := TChilkatCert.Create(Self); // Load a digital certificate. success := cert.LoadFromFile('digitalCert.cer'); if (success = 0) then begin Memo1.Lines.Add(cert.LastErrorText); Exit; end; // A .cer file does not contain the private key. It should contain // the public key... pubKey := TPublicKey.Create(Self); cert.GetPublicKey(pubKey.ControlInterface); // Let's have a look at it (in XML format). Memo1.Lines.Add('Public Key from Certificate:'); Memo1.Lines.Add(pubKey.GetXml()); // An RSA public key consists of a modulus and exponent. // An RSA private key includes both the modulus and exponent, // as well as other "big" numbers: P, Q, D, etc. // Let's load an RSA private key from a DER-encoded file: privKey := TPrivateKey.Create(Self); success := privKey.LoadAnyFormatFile('PrivateKey.key',''); if (success <> 1) then begin Memo1.Lines.Add(privKey.LastErrorText); Exit; end; // If this private key is the matching half to the public key from // the certificate, then the modulus and exponent should // be identical. (Thus, a "private key" really contains both the public part as well as the private parts...). Memo1.Lines.Add('Private Key from DER:'); Memo1.Lines.Add(privKey.GetXml()); end; |
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