Delphi ActiveX

JWE using "dir" Direct use of Shared Symmetric Key

See more JSON Web Encryption (JWE) Examples

Demonstrates how to create a JWE using the "dir" alg -- which is to directly use a shared symmetric key.

Note: This example requires Chilkat v9.5.0.66 or greater.

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;
plaintext: WideString;
jwe: TChilkatJwe;
jweProtHdr: TChilkatJsonObject;
recipientIndex: Integer;
strJwe: WideString;
jwe2: TChilkatJwe;
originalPlaintext: WideString;

begin
success := 0;

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

// Note: This example requires Chilkat v9.5.0.66 or greater.

plaintext := 'Live long and prosper.';

jwe := TChilkatJwe.Create(Self);

// First build the JWE Protected Header..
jweProtHdr := TChilkatJsonObject.Create(Self);
jweProtHdr.AppendString('alg','dir');
jweProtHdr.AppendString('enc','A128GCM');

// Don't forget to actually provide the protected header to the JWE object:
jwe.SetProtectedHeader(jweProtHdr.ControlInterface);

// The JWE is to use 128-bit AES GCM encryption as specified by the "enc" parameter.
// Given that the "alg" = "dir", we are to directly specify the AES GCM key.
// (It is assumed that the decrypting side also has knowledge of the direct key to be used..)

// Our key will be these 16 hex bytes: 000102030405060708090A0B0C0D0E0F

// The SetWrappingKey method is also used for "dir" direct keys.
// However, if there are multiple recipients, they must all share the same CEK (Content Encryption Key),
// which is specified by calling SetWrappingKey with an index of 0.

recipientIndex := 0;
jwe.SetWrappingKey(recipientIndex,'000102030405060708090A0B0C0D0E0F','hex');

// Encrypt and return the JWE:
strJwe := jwe.Encrypt(plaintext,'utf-8');
if (jwe.LastMethodSuccess <> 1) then
  begin
    Memo1.Lines.Add(jwe.LastErrorText);
    Exit;
  end;

// Show the JWE we just created:
Memo1.Lines.Add(strJwe);

// Decrypt the JWE.
jwe2 := TChilkatJwe.Create(Self);
success := jwe2.LoadJwe(strJwe);
if (success <> 1) then
  begin
    Memo1.Lines.Add(jwe2.LastErrorText);
    Exit;
  end;
jwe2.SetWrappingKey(0,'000102030405060708090A0B0C0D0E0F','hex');

// Decrypt.
originalPlaintext := jwe2.Decrypt(0,'utf-8');
if (jwe2.LastMethodSuccess <> 1) then
  begin
    Memo1.Lines.Add(jwe2.LastErrorText);
    Exit;
  end;

Memo1.Lines.Add('original text: ');
Memo1.Lines.Add(originalPlaintext);

// Sample output:
// eyJhbGciOiJkaXIiLCJlbmMiOiJBMTI4R0NNIn0..20HX5Huc7f1nQC4pBUtiCQ.axFZIxtZy5j0ifJQUzGXLKIpsBuxJA.eBrOC-NrsreN6JeGuOPk1g
// original text: 
// Live long and prosper.
end;