(Delphi DLL) Create JWT using a Certificate's Private Key

See more JSON Web Token (JWT) Examples

Demonstrates how to create a JWT using a certificate's private key.

Chilkat for Delphi Downloads Chilkat non-ActiveX DLL for Delphi Chilkat ActiveX DLL for Delphi * The examples here use the non-ActiveX DLL.

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Jwt, JsonObject, Cert;

...

procedure TForm1.Button1Click(Sender: TObject);
var
cert: HCkCert;
success: Boolean;
jwt: HCkJwt;
jose: HCkJsonObject;
claims: HCkJsonObject;
curDateTime: Integer;
token: PWideChar;

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

// Demonstrates how to create a JWT using an certificate's private key.

cert := CkCert_Create();

// Load an ECC private key from a PEM file.
success := CkCert_LoadPfxFile(cert,'c:/temp/myPfx.pfx','pfxPassword');
if (success <> True) then
  begin
    Memo1.Lines.Add(CkCert__lastErrorText(cert));
    Exit;
  end;

jwt := CkJwt_Create();

// Build the JOSE header
jose := CkJsonObject_Create();
// Note: The IsEcdsa function was added in Chilkat v10.1.0
if (CkCert_IsEcdsa(cert) = True) then
  begin
    // Use ES256.  Pass the string "ES384" or "ES512" to use ECC with SHA-384 or SHA-512.
    CkJsonObject_AppendString(jose,'alg','ES256');
  end
else
  begin
    // Probably RSA...
    // Use RS256.  Pass the string "RS384" or "RS512" to use RSA with SHA-384 or SHA-512.
    CkJsonObject_AppendString(jose,'alg','RS256');
  end;

CkJsonObject_AppendString(jose,'typ','JWT');

// Now build the JWT claims (also known as the payload)
claims := CkJsonObject_Create();
CkJsonObject_AppendString(claims,'iss','http://example.org');
CkJsonObject_AppendString(claims,'sub','John');
CkJsonObject_AppendString(claims,'aud','http://example.com');

// Set the timestamp of when the JWT was created to now.
curDateTime := CkJwt_GenNumericDate(jwt,0);
CkJsonObject_AddIntAt(claims,-1,'iat',curDateTime);

// Set the "not process before" timestamp to now.
CkJsonObject_AddIntAt(claims,-1,'nbf',curDateTime);

// Set the timestamp defining an expiration time (end time) for the token
// to be now + 1 hour (3600 seconds)
CkJsonObject_AddIntAt(claims,-1,'exp',curDateTime + 3600);

// Produce the smallest possible JWT:
CkJwt_putAutoCompact(jwt,True);

// Create the JWT token.
token := CkJwt__createJwtCert(jwt,CkJsonObject__emit(jose),CkJsonObject__emit(claims),cert);

Memo1.Lines.Add(token);

// Example output:
// eyJhbGciOiJFUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJodHRwOi8vZXhhbXBsZS5vcmciLCJzdWIiOiJKb2huIiwiYXVkIjoiaHR0cDovL2V4YW1wbGUuY29tIiwiaWF0IjoxNDg1NzA4NzkyLCJuYmYiOjE0ODU3MDg3OTIsImV4cCI6MTQ4NTcxMjM5Mn0.wqsuyJpxJ073ox-lOiLFqG1lQocXe4hGf2XGZJRrO3qn0UusxI_bu3Gzky8gBsH4sA4u9TWZn5M-1wYMMIJk6Q

CkCert_Dispose(cert);
CkJwt_Dispose(jwt);
CkJsonObject_Dispose(jose);
CkJsonObject_Dispose(claims);

end;