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Pascal (Lazarus/Delphi)

Sign Email using RSASSA-PSS with SHA256

See more Email Object Examples

Demonstrates how to sign an email using the RSASSA-PSS signing algorithm with the SHA256 hash algorithm.

Chilkat Pascal (Lazarus/Delphi) Downloads

Pascal (Lazarus/Delphi)
program ChilkatDemo;

// Demonstrates using the Chilkat Pascal wrapper via the C bridge DLL.
// Builds as a console application under Lazarus (FPC) or Delphi.

{$IFDEF FPC}
  {$MODE DELPHI}
{$ENDIF}
{$APPTYPE CONSOLE}

uses
  {$IFDEF UNIX}
  cthreads,
  {$ENDIF}
  SysUtils,
  CkDllLoader,
  Chilkat.Pfx,
  Chilkat.StringBuilder,
  Chilkat.MailMan,
  Chilkat.Cert,
  Chilkat.Email;

// ---------------------------------------------------------------------------

procedure RunDemo;
var
  success: Boolean;
  pfx: TPfx;
  email: TEmail;
  cert: TCert;
  mailman: TMailMan;
  sbSignedEmail: TStringBuilder;

begin
  success := False;

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

  //  Get a digital certificate with private key from a .pfx
  //  (Chilkat has many different ways to provide a cert + private key for siging.
  //  Using a PFX is just one possible option.)
  pfx := TPfx.Create;
  success := pfx.LoadPfxFile('qa_data/rsassa-pss/privatekey.pfx','PFX_PASSWORD');
  if (success = False) then
    begin
      WriteLn(pfx.LastErrorText);
      Exit;
    end;

  email := TEmail.Create;

  //  Load an email to be signed.
  //  (We could have alternatively just built the email directly by setting the Subject, Body, From, To recipients, etc.)
  //  The contents of this sample email is shown below.
  success := email.LoadEml('qa_data/rsassa-pss/sample.eml');
  if (success = False) then
    begin
      WriteLn(email.LastErrorText);
      Exit;
    end;

  //  Indicate that the email is to be signed, and that we want to use RSASSA-PSS.
  email.SendSigned := True;
  email.SigningAlg := 'pss';
  email.SigningHashAlg := 'sha256';

  //  Get the certificate to be used for signing.
  //  (The typical case for a PFX is that it contains a cert with an associated private key,
  //  as well as other certificates in the chain of authentication.  The cert with the private
  //  key should be in the first position at index 0.)

  cert := TCert.Create;
  success := pfx.CertAt(0,cert);
  if (success = False) then
    begin
      WriteLn(pfx.LastErrorText);
      Exit;
    end;

  //  Tell the email object to use this cert (and private key) for signing.
  email.SetSigningCert(cert);

  //  The mailman object will do the RSASSA-PSS signing.
  mailman := TMailMan.Create;

  //  Tell the mailman to produce a multipart/signed email instead of an application/pkcs7-mime.
  mailman.OpaqueSigning := False;

  //  Tell the mailman to "render" the email. This signs the email and returns
  //  the MIME of the signed email.
  sbSignedEmail := TStringBuilder.Create;
  success := mailman.RenderToMimeSb(email,sbSignedEmail);
  if (success = False) then
    begin
      WriteLn(mailman.LastErrorText);
      Exit;
    end;

  //  Save the signed email to a file.
  sbSignedEmail.WriteFile('qa_output/rsassa-pss-signed.eml',email.Charset,False);

  WriteLn('Success.');

  //  -----------------------------------------------
  //  This is the MIME of the pre-signed Email.
  //  Scroll down to see the signed MIME.

  //  MIME-Version: 1.0
  //  Date: Tue, 18 Apr 2017 10:12:16 -0500
  //  Message-ID: <D5E3C6F705B2C42C1ED1B5D835B50DDD4536267D@CHILKAT13>
  //  Content-Type: multipart/mixed; boundary="------------060103010600070703070806"
  //  X-Priority: 3 (Normal)
  //  Subject: This is a sample email
  //  To: "Chilkat Support" <support@chilkatsoft.com>
  //  From: "Chilkat GMail" <chilkat.support@gmail.com>
  //  
  //  --------------060103010600070703070806
  //  Content-Type: multipart/alternative; boundary="------------000908080200080609080305"
  //  
  //  --------------000908080200080609080305
  //  Content-Type: text/plain
  //  
  //  This is the plain-text body
  //  --------------000908080200080609080305
  //  Content-Type: multipart/related; boundary="------------000600080404090108060206"
  //  
  //  --------------000600080404090108060206
  //  Content-Type: text/html
  //  
  //  <html><head></head><body><b>This is the HTML body</b><br><img src="starfish.jpg"></body></html>
  //  --------------000600080404090108060206
  //  Content-Type: image/jpeg; name="starfish.jpg"
  //  Content-Transfer-Encoding: base64
  //  Content-Disposition: inline; filename="starfish.jpg"
  //  Content-Location: starfish.jpg
  //  
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  //  ZXQgV2lkZ2l0cyBQdHkgTHRkMQ8wDQYDVQQDDAZXaWRnZXQxKDAmBgkqhkiG9w0BCQEWGWFkbWlu
  //  QGludGVybmV0d2lkZ2V0cy5jb20wHhcNMTYxMTAxMTY1MjMyWhcNMjExMDMxMTY1MjMyWjCBkjEL
  //  MAkGA1UEBhMCQVUxETAPBgNVBAgMCFZpY3RvcmlhMRIwEAYDVQQHDAlNZWxib3VybmUxITAfBgNV
  //  BAoMGEludGVybmV0IFdpZGdpdHMgUHR5IEx0ZDEPMA0GA1UEAwwGV2lkZ2V0MSgwJgYJKoZIhvcN
  //  AQkBFhlhZG1pbkBpbnRlcm5ldHdpZGdldHMuY29tMIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKB
  //  gQDGIdoCjyavs+F/Rm0VIB4m6O7VL1j+1IqieoR9NEX2GQvu2VCdceyxf9qaw1bxipEvjLwUkw7M
  //  e+BTlLpWQbBMH87s6KpsC8MVyXhMLpP0oM8NFix/vLz2wdLhUh7CZvJA0plqkJk9bj57QIu+EO1k
  //  tUHM2DFb6sckvCL2yybD1wIDAQABo1AwTjAdBgNVHQ4EFgQUONKKu2zsXIrinWxIGT654vrcQwsw
  //  HwYDVR0jBBgwFoAUONKKu2zsXIrinWxIGT654vrcQwswDAYDVR0TBAUwAwEB/zANBgkqhkiG9w0B
  //  AQsFAAOBgQArFvdi5u9i2QF1Qw+cdC1l7w2Y3+q6RIkln2W8rWJFje00644o8hXy7v46giJCedmF
  //  ULlhm1n7XIsZGy2W3lJ77v5agn9gFwXu1h3cqkGXkoteE6SQJQXWgsW3GWPveObvTL8LF4y57fgM
  //  9ZWS+V9MJajeu44Rf/tU17TLYKjvEjGCA7MwggOvAgEBMIGgMIGSMQswCQYDVQQGEwJBVTERMA8G
  //  A1UECAwIVmljdG9yaWExEjAQBgNVBAcMCU1lbGJvdXJuZTEhMB8GA1UECgwYSW50ZXJuZXQgV2lk
  //  Z2l0cyBQdHkgTHRkMQ8wDQYDVQQDDAZXaWRnZXQxKDAmBgkqhkiG9w0BCQEWGWFkbWluQGludGVy
  //  bmV0d2lkZ2V0cy5jb20CCQDD7CQk9dXJ4jANBglghkgBZQMEAgEFAKCCAjQwGAYJKoZIhvcNAQkD
  //  MQsGCSqGSIb3DQEHATAcBgkqhkiG9w0BCQUxDxcNMTcwNDIwMTQ0NzUxWjAvBgkqhkiG9w0BCQQx
  //  IgQgoQYcqPNu0JEqphG8371TRQO+HeVg27ePi/WlH0ORwn8wXwYJKoZIhvcNAQkPMVIwUDALBglg
  //  hkgBZQMEAQIwCgYIKoZIhvcNAwcwDgYIKoZIhvcNAwICAgCAMA0GCCqGSIb3DQMCAgFAMAcGBSsO
  //  AwIHMA0GCCqGSIb3DQMCAgEoMIGxBgkrBgEEAYI3EAQxgaMwgaAwgZIxCzAJBgNVBAYTAkFVMREw
  //  DwYDVQQIDAhWaWN0b3JpYTESMBAGA1UEBwwJTWVsYm91cm5lMSEwHwYDVQQKDBhJbnRlcm5ldCBX
  //  aWRnaXRzIFB0eSBMdGQxDzANBgNVBAMMBldpZGdldDEoMCYGCSqGSIb3DQEJARYZYWRtaW5AaW50
  //  ZXJuZXR3aWRnZXRzLmNvbQIJAMPsJCT11cniMIGzBgsqhkiG9w0BCRACCzGBo6CBoDCBkjELMAkG
  //  A1UEBhMCQVUxETAPBgNVBAgMCFZpY3RvcmlhMRIwEAYDVQQHDAlNZWxib3VybmUxITAfBgNVBAoM
  //  GEludGVybmV0IFdpZGdpdHMgUHR5IEx0ZDEPMA0GA1UEAwwGV2lkZ2V0MSgwJgYJKoZIhvcNAQkB
  //  FhlhZG1pbkBpbnRlcm5ldHdpZGdldHMuY29tAgkAw+wkJPXVyeIwPQYJKoZIhvcNAQEKMDCgDTAL
  //  BglghkgBZQMEAgGhGjAYBgkqhkiG9w0BAQgwCwYJYIZIAWUDBAIBogMCASAEgYAHeE+bV998i6hY
  //  qX2srAVX1DAWeI6JbhxYCueC04vzl8ggke5pi4DcfNP3SVzNSzRKSFiFYNGcNpMQNASHVOl+JHCt
  //  bIXdgLSIz6uoxSUo51w4x2a4RYgnU3eafY27f1J4AEVPzpQk+1Q3hoVi7oBo0T2pKgA4WcavirEN
  //  4kZLBg==
  //  
  //  --------------090003010300010703020907--
  //  


  pfx.Free;
  email.Free;
  cert.Free;
  mailman.Free;
  sbSignedEmail.Free;

end;

// ---------------------------------------------------------------------------

begin

  try
    RunDemo;
  except
    on E: Exception do
      WriteLn('Unhandled exception: ', E.ClassName, ': ', E.Message);
  end;

  WriteLn;
  {$IFDEF MSWINDOWS}
  WriteLn('Press Enter to exit...');
  ReadLn;
  {$ENDIF}
end.