Delphi ActiveX

Duplicate openssl dgst -md5 -sign myKey.pem something.txt | openssl enc -base64 -A

See more RSA Examples

Demonstrates how to duplicate the creation of an RSA signature produced by this OpenSSL command:

openssl dgst -md5 -sign myKey.pem something.txt | openssl enc -base64 -A

Delphi ActiveX

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;
pkey: TPrivateKey;
rsa: TChilkatRsa;
strData: WideString;
base64Sig: WideString;

begin
success := 0;

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

pkey := TPrivateKey.Create(Self);

// Load the private key from an RSA PEM file:
success := pkey.LoadPemFile('myKey.pem');

rsa := TChilkatRsa.Create(Self);

// Import the private key into the RSA component:
success := rsa.UsePrivateKey(pkey.ControlInterface);
if (success = 0) then
  begin
    Memo1.Lines.Add(rsa.LastErrorText);
    Exit;
  end;

// OpenSSL uses BigEndian byte ordering:
rsa.LittleEndian := 0;

// The resulting signature will be a Base64 string:
rsa.EncodingMode := 'base64';

// For simplicity, we're not loading
// the data to be signed from a file.  We are instead simply
// using a literal string value.  
strData := 'This is the text to be signed.';

// Hash the input using MD5, and then sign the hash:
// Other valid hash algorithm choices are "md2" and "sha-1".
base64Sig := rsa.SignStringENC(strData,'md5');

Memo1.Lines.Add(base64Sig);

Memo1.Lines.Add('Success!');
end;