Delphi ActiveX Requires Chilkat v11.0.0+

RSA Signature SHA256withRSA, iso-8859-1, base64

See more RSA Examples

RSA sign the iso-8859-1 byte representation of a string with SHA256withRSA, and return the signature in the base64 encoding. Delphi ActiveX

var
success: Integer;
privKey: TPrivateKey;
rsa: TChilkatRsa;
originalData: WideString;
sigBase64: WideString;

begin
success := 0;

//  This example requires the Chilkat API to have been previously unlocked.
//  See Global Unlock Sample for sample code.

//  This example will duplicate the following Java code:
//  
//  Signature sign = Signature.getInstance("SHA256withRSA");
//  sign.initSign(privateKey);
//  sign.update(original.getBytes(Charset.forName("ISO-8859-1")));
//  
//  ...
//  byte[] resultado = sign.sign();
//  sello = encodeByteArrayToBase64(resultado);
//  

//  Load an RSA private key for signing.
//  You can load any format file.  This example loads a .pem, but you can provide path to any type of file holding a private key.
privKey := TPrivateKey.Create(Self);
success := privKey.LoadAnyFormatFile('qa_data/pem/rsa_passwd.pem','passwd');
if (success = 0) then
  begin
    Memo1.Lines.Add(privKey.LastErrorText);
    Exit;
  end;

rsa := TChilkatRsa.Create(Self);
rsa.UsePrivateKey(privKey.ControlInterface);

originalData := 'This is the string to be hashed an RSA signed.';

//  Indicate that we want the iso-8859-1 byte representation of the string to be signed
rsa.Charset := 'iso-8859-1';

//  We want the RSA signature in base64 format
rsa.EncodingMode := 'base64';

sigBase64 := rsa.SignStringENC(originalData,'sha256');
Memo1.Lines.Add(sigBase64);