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(Delphi ActiveX) RSA Signature/Verify with .key and .cerSee more RSA ExamplesDemonstrates how to use a .key file (private key) and digital certificate (.cer, public key) to create and verify an RSA signature.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 .key file: success := privKey.LoadPemFile('privateKey.key'); 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; // Create the signature as a hex string: rsa.EncodingMode := 'hex'; strData := 'This is the string to be signed.'; // Sign the string using the sha256 hash algorithm. // Other valid choices are "md2", "sha1", "sha384", // "sha512", and "md5". hexSig := rsa.SignStringENC(strData,'sha256'); Memo1.Lines.Add(hexSig); // Load a digital certificate from a .cer file: cert := TChilkatCert.Create(Self); success := cert.LoadFromFile('myCert.cer'); if (success = 0) then begin Memo1.Lines.Add(cert.LastErrorText); Exit; end; pubKey := TPublicKey.Create(Self); cert.GetPublicKey(pubKey.ControlInterface); // Now verify using a new instance of the RSA object: rsa2 := TChilkatRsa.Create(Self); // Import the public key into the RSA object: success := rsa2.UsePublicKey(pubKey.ControlInterface); if (success = 0) then begin Memo1.Lines.Add(rsa2.LastErrorText); Exit; end; // The signature is a hex string, so make sure the EncodingMode is correct: rsa2.EncodingMode := 'hex'; // Verify the signature: success := rsa2.VerifyStringENC(strData,'sha256',hexSig); if (success = 0) then begin Memo1.Lines.Add(rsa2.LastErrorText); Exit; end; Memo1.Lines.Add('Success.'); end; |
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