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(Delphi ActiveX) RSA Sign with PKCS8 Encrypted KeyDemonstrates how to load a private key from an encrypted PKCS8 file and create an RSA digital signature (and then verify it). 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; privKey: TPrivateKey; rsa: TChilkatRsa; strData: WideString; hexSig: WideString; cert: TChilkatCert; pubKey: TPublicKey; rsa2: TChilkatRsa; begin success := 0; // This example assumes the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. privKey := TPrivateKey.Create(Self); // Load the private key from an RSA PEM file: success := privKey.LoadAnyFormatFile('raul_privateKey.key','a0123456789'); if (success = 0) then begin Memo1.Lines.Add(privKey.LastErrorText); Exit; end; rsa := TChilkatRsa.Create(Self); // Import the private key into the RSA component: success := rsa.UsePrivateKey(privKey.ControlInterface); if (success = 0) then begin Memo1.Lines.Add(rsa.LastErrorText); Exit; end; // This example will sign a string, and receive the signature // in a hex-encoded string. Therefore, set the encoding mode // to "hex": rsa.EncodingMode := 'hex'; strData := 'This is the string to be signed.'; // Sign the string using the sha256 hash algorithm. // Other valid choices are sha1, sha384, sha512 and others. hexSig := rsa.SignStringENC(strData,'sha256'); if (rsa.LastMethodSuccess = 0) then begin Memo1.Lines.Add(rsa.LastErrorText); Exit; end; Memo1.Lines.Add(hexSig); // Now verify with the public key. // This example shows how to use the public key from // a digital certificate (.cer file) cert := TChilkatCert.Create(Self); success := cert.LoadFromFile('raul_publicKey.cer'); if (success = 0) then begin Memo1.Lines.Add(cert.LastErrorText); Exit; end; pubKey := TPublicKey.Create(Self); cert.GetPublicKey(pubKey.ControlInterface); rsa2 := TChilkatRsa.Create(Self); success := rsa2.UsePublicKey(pubKey.ControlInterface); if (success = 0) then begin Memo1.Lines.Add(rsa2.LastErrorText); Exit; end; // Verify the signature against the original data: rsa2.EncodingMode := 'hex'; success := rsa2.VerifyStringENC(strData,'sha256',hexSig); if (success = 0) then begin Memo1.Lines.Add(rsa2.LastErrorText); Exit; end; Memo1.Lines.Add('Signature verified!'); // Verify with incorrect data: success := rsa2.VerifyStringENC('something else','sha256',hexSig); if (success <> 1) then begin Memo1.Lines.Add('Signature not verified! (which was expected in this case)'); end else begin Memo1.Lines.Add('Hmmm... that''s not right...'); end; end; |
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