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(Delphi ActiveX) RSA Encrypt and Decrypt StringsSee more RSA ExamplesDelphi ActiveX sample code to RSA public-key encrypt and decrypt strings using public and private keys.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; rsa: TChilkatRsa; privKey: TPrivateKey; pubKey: TPublicKey; plainText: WideString; rsaEncryptor: TChilkatRsa; usePrivateKey: Integer; encryptedStr: WideString; rsaDecryptor: TChilkatRsa; decryptedStr: WideString; begin success := 0; // This example assumes the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. rsa := TChilkatRsa.Create(Self); // This example also generates the public and private // keys to be used in the RSA encryption. // Normally, you would generate a key pair once, // and distribute the public key to your partner. // Anything encrypted with the public key can be // decrypted with the private key. The reverse is // also true: anything encrypted using the private // key can be decrypted using the public key. // Generate a 2048-bit key. Chilkat RSA supports // key sizes ranging from 512 bits to 4096 bits. privKey := TPrivateKey.Create(Self); success := rsa.GenKey(2048,privKey.ControlInterface); if (success = 0) then begin Memo1.Lines.Add(rsa.LastErrorText); Exit; end; pubKey := TPublicKey.Create(Self); privKey.ToPublicKey(pubKey.ControlInterface); plainText := 'Encrypting and decrypting should be easy!'; // Start with a new RSA object to demonstrate that all we // need are the keys previously exported: rsaEncryptor := TChilkatRsa.Create(Self); // Encrypted output is always binary. In this case, we want // to encode the encrypted bytes in a printable string. // Our choices are "hex", "base64", "url", "quoted-printable". rsaEncryptor.EncodingMode := 'hex'; // We'll encrypt with the public key and decrypt with the private // key. success := rsaEncryptor.UsePublicKey(pubKey.ControlInterface); usePrivateKey := 0; encryptedStr := rsaEncryptor.EncryptStringENC(plainText,usePrivateKey); Memo1.Lines.Add(encryptedStr); // Now decrypt: rsaDecryptor := TChilkatRsa.Create(Self); rsaDecryptor.EncodingMode := 'hex'; success := rsaDecryptor.UsePrivateKey(privKey.ControlInterface); usePrivateKey := 1; decryptedStr := rsaDecryptor.DecryptStringENC(encryptedStr,usePrivateKey); Memo1.Lines.Add(decryptedStr); end; |
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