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(Delphi DLL) Verify a JWT Created by the Amazon Cognito Service

Demonstrates how to verify a JWT created by the Amazon Cognito Service.

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, Http, StringBuilder, Jwt, PublicKey, JsonObject;

...

procedure TForm1.Button1Click(Sender: TObject);
var
http: HCkHttp;
sbJsonKeys: HCkStringBuilder;
success: Boolean;
jsonKeys: HCkJsonObject;
jsonKey1: HCkJsonObject;
pubKey1: HCkPublicKey;
jwt: HCkJwt;
token: PWideChar;
sigVerified: Boolean;
leeway: Integer;
bTimeValid: Boolean;
payload: PWideChar;
json: HCkJsonObject;
joseHeader: PWideChar;

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

// The public keys for this example are at https://cognito-idp.us-east-2.amazonaws.com/us-east-2_******/.well-known/jwks.json
// Let's get them:

http := CkHttp_Create();
sbJsonKeys := CkStringBuilder_Create();
success := CkHttp_QuickGetSb(http,'https://cognito-idp.us-east-2.amazonaws.com/us-east-2_******/.well-known/jwks.json',sbJsonKeys);
if (success = False) then
  begin
    Memo1.Lines.Add(CkHttp__lastErrorText(http));
    Exit;
  end;

jsonKeys := CkJsonObject_Create();
CkJsonObject_LoadSb(jsonKeys,sbJsonKeys);
CkJsonObject_putEmitCompact(jsonKeys,False);
Memo1.Lines.Add(CkJsonObject__emit(jsonKeys));

// Here are the keys:

// {
//   "keys": [
//     {
//       "alg": "RS256",
//       "e": "AQAB",
//       "kid": "1A/L5Fsb2EsEwxy5E0cmCMS1BnMe6Jl6NXiMig4iNwU=",
//       "kty": "RSA",
//       "n": "y0w7BJrIJYi ... jKG27z2P3OKw",
//       "use": "sig"
//     },
//     {
//       "alg": "RS256",
//       "e": "AQAB",
//       "kid": "mos6VTJnvDwurY3ghJg6IAPUq+dMwl6CL/iThzJOkzg=",
//       "kty": "RSA",
//       "n": "qbIEH-7tg6yrT ... 3Fj94ooTd0w",
//       "use": "sig"
//     }
//   ]
// }

// Try the 1st key.
jsonKey1 := CkJsonObject_ObjectOf(jsonKeys,'keys[0]');
if (CkJsonObject_getLastMethodSuccess(jsonKeys) = False) then
  begin
    Memo1.Lines.Add('Did not get the 1st JSON public key.');
    Exit;
  end;

pubKey1 := CkPublicKey_Create();
success := CkPublicKey_LoadFromString(pubKey1,CkJsonObject__emit(jsonKey1));
if (success = False) then
  begin
    Memo1.Lines.Add(CkPublicKey__lastErrorText(pubKey1));
    Exit;
  end;

CkJsonObject_Dispose(jsonKey1);

Memo1.Lines.Add('Success');

jwt := CkJwt_Create();

// I did not include the an actual AWS Cognito token here because our test sample used customer-provided data..
token := 'eyJ..asXg';

// First verify the signature.
sigVerified := CkJwt_VerifyJwtPk(jwt,token,pubKey1);
Memo1.Lines.Add('verified: ' + IntToStr(Ord(sigVerified)));

// Let's see if the time constraints, if any, are valid.
// The above JWT was created on the afternoon of 16-May-2016, with an expiration of 1 hour.
// If the current system time is before the "nbf" time, or after the "exp" time,
// then IsTimeValid will return false/0.
// Also, we'll allow a leeway of 60 seconds to account for any clock skew.
// Note: If the token has no "nbf" or "exp" claim fields, then IsTimeValid is always true.
leeway := 60;
bTimeValid := CkJwt_IsTimeValid(jwt,token,leeway);
Memo1.Lines.Add('time constraints valid: ' + IntToStr(Ord(bTimeValid)));

// Now let's recover the original claims JSON (the payload).
payload := CkJwt__getPayload(jwt,token);
// The payload will likely be in compact form:
Memo1.Lines.Add(payload);

// We can format for human viewing by loading it into Chilkat's JSON object
// and emit.
json := CkJsonObject_Create();
success := CkJsonObject_Load(json,payload);
CkJsonObject_putEmitCompact(json,False);
Memo1.Lines.Add(CkJsonObject__emit(json));

// We can recover the original JOSE header in the same way:
joseHeader := CkJwt__getHeader(jwt,token);
// The payload will likely be in compact form:
Memo1.Lines.Add(joseHeader);

// We can format for human viewing by loading it into Chilkat's JSON object
// and emit.
success := CkJsonObject_Load(json,joseHeader);
CkJsonObject_putEmitCompact(json,False);
Memo1.Lines.Add(CkJsonObject__emit(json));

CkHttp_Dispose(http);
CkStringBuilder_Dispose(sbJsonKeys);
CkJsonObject_Dispose(jsonKeys);
CkPublicKey_Dispose(pubKey1);
CkJwt_Dispose(jwt);
CkJsonObject_Dispose(json);

end;

 

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