(Delphi DLL) Create JWS with Multiple Signatures using the General JSON Serialization Format

Creates a JSON Web Signature (JWS) containing 3 signatures and output using the general JSON serialization format.

Chilkat supports all of the following JWS algorithms:

   +--------------+-------------------------------+--------------------+
   | "alg" Param  | Digital Signature or MAC      | Implementation     |
   | Value        | Algorithm                     | Requirements       |
   +--------------+-------------------------------+--------------------+
   | HS256        | HMAC using SHA-256            | Required           |
   | HS384        | HMAC using SHA-384            | Optional           |
   | HS512        | HMAC using SHA-512            | Optional           |
   | RS256        | RSASSA-PKCS1-v1_5 using       | Recommended        |
   |              | SHA-256                       |                    |
   | RS384        | RSASSA-PKCS1-v1_5 using       | Optional           |
   |              | SHA-384                       |                    |
   | RS512        | RSASSA-PKCS1-v1_5 using       | Optional           |
   |              | SHA-512                       |                    |
   | ES256        | ECDSA using P-256 and SHA-256 | Recommended+       |
   | ES384        | ECDSA using P-384 and SHA-384 | Optional           |
   | ES512        | ECDSA using P-521 and SHA-512 | Optional           |
   | PS256        | RSASSA-PSS using SHA-256 and  | Optional           |
   |              | MGF1 with SHA-256             |                    |
   | PS384        | RSASSA-PSS using SHA-384 and  | Optional           |
   |              | MGF1 with SHA-384             |                    |
   | PS512        | RSASSA-PSS using SHA-512 and  | Optional           |
   |              | MGF1 with SHA-512             |                    |
   +--------------+-------------------------------+--------------------+

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

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, StringBuilder, PrivateKey, Jws, JsonObject;

...

procedure TForm1.Button1Click(Sender: TObject);
var
sbRsaJwk: HCkStringBuilder;
rsaKey: HCkPrivateKey;
success: Boolean;
sbEccJwk: HCkStringBuilder;
eccKey: HCkPrivateKey;
hmacKey: PWideChar;
jwsProtHdr0: HCkJsonObject;
jwsUnprotHdr0: HCkJsonObject;
jwsProtHdr1: HCkJsonObject;
jwsUnprotHdr1: HCkJsonObject;
jwsProtHdr2: HCkJsonObject;
jwsUnprotHdr2: HCkJsonObject;
jws: HCkJws;
bIncludeBom: Boolean;
payloadStr: PWideChar;
jwsStr: PWideChar;
json: HCkJsonObject;

begin
// 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.

// The JWS to be created will contain three signatures.
// The 1st will use an ECC key, the 2nd an RSA key, and the 3rd an HMAC key.

// Prepare each key..

// ---------------------------------------------------
// Use the following RSA key loaded from JWK format.
sbRsaJwk := CkStringBuilder_Create();
CkStringBuilder_Append(sbRsaJwk,'{"kty":"RSA",');
CkStringBuilder_Append(sbRsaJwk,'"n":"ofgWCuLjybRlzo0tZWJjNiuSfb4p4fAkd_wWJcyQoTbji9k0l8W26mPddx');
CkStringBuilder_Append(sbRsaJwk,'HmfHQp-Vaw-4qPCJrcS2mJPMEzP1Pt0Bm4d4QlL-yRT-SFd2lZS-pCgNMs');
CkStringBuilder_Append(sbRsaJwk,'D1W_YpRPEwOWvG6b32690r2jZ47soMZo9wGzjb_7OMg0LOL-bSf63kpaSH');
CkStringBuilder_Append(sbRsaJwk,'SXndS5z5rexMdbBYUsLA9e-KXBdQOS-UTo7WTBEMa2R2CapHg665xsmtdV');
CkStringBuilder_Append(sbRsaJwk,'MTBQY4uDZlxvb3qCo5ZwKh9kG4LT6_I5IhlJH7aGhyxXFvUK-DWNmoudF8');
CkStringBuilder_Append(sbRsaJwk,'NAco9_h9iaGNj8q2ethFkMLs91kzk2PAcDTW9gb54h4FRWyuXpoQ",');
CkStringBuilder_Append(sbRsaJwk,'"e":"AQAB",');
CkStringBuilder_Append(sbRsaJwk,'"d":"Eq5xpGnNCivDflJsRQBXHx1hdR1k6Ulwe2JZD50LpXyWPEAeP88vLNO97I');
CkStringBuilder_Append(sbRsaJwk,'jlA7_GQ5sLKMgvfTeXZx9SE-7YwVol2NXOoAJe46sui395IW_GO-pWJ1O0');
CkStringBuilder_Append(sbRsaJwk,'BkTGoVEn2bKVRUCgu-GjBVaYLU6f3l9kJfFNS3E0QbVdxzubSu3Mkqzjkn');
CkStringBuilder_Append(sbRsaJwk,'439X0M_V51gfpRLI9JYanrC4D4qAdGcopV_0ZHHzQlBjudU2QvXt4ehNYT');
CkStringBuilder_Append(sbRsaJwk,'CBr6XCLQUShb1juUO1ZdiYoFaFQT5Tw8bGUl_x_jTj3ccPDVZFD9pIuhLh');
CkStringBuilder_Append(sbRsaJwk,'BOneufuBiB4cS98l2SR_RQyGWSeWjnczT0QU91p1DhOVRuOopznQ",');
CkStringBuilder_Append(sbRsaJwk,'"p":"4BzEEOtIpmVdVEZNCqS7baC4crd0pqnRH_5IB3jw3bcxGn6QLvnEtfdUdi');
CkStringBuilder_Append(sbRsaJwk,'YrqBdss1l58BQ3KhooKeQTa9AB0Hw_Py5PJdTJNPY8cQn7ouZ2KKDcmnPG');
CkStringBuilder_Append(sbRsaJwk,'BY5t7yLc1QlQ5xHdwW1VhvKn-nXqhJTBgIPgtldC-KDV5z-y2XDwGUc",');
CkStringBuilder_Append(sbRsaJwk,'"q":"uQPEfgmVtjL0Uyyx88GZFF1fOunH3-7cepKmtH4pxhtCoHqpWmT8YAmZxa');
CkStringBuilder_Append(sbRsaJwk,'ewHgHAjLYsp1ZSe7zFYHj7C6ul7TjeLQeZD_YwD66t62wDmpe_HlB-TnBA');
CkStringBuilder_Append(sbRsaJwk,'-njbglfIsRLtXlnDzQkv5dTltRJ11BKBBypeeF6689rjcJIDEz9RWdc",');
CkStringBuilder_Append(sbRsaJwk,'"dp":"BwKfV3Akq5_MFZDFZCnW-wzl-CCo83WoZvnLQwCTeDv8uzluRSnm71I3Q');
CkStringBuilder_Append(sbRsaJwk,'CLdhrqE2e9YkxvuxdBfpT_PI7Yz-FOKnu1R6HsJeDCjn12Sk3vmAktV2zb');
CkStringBuilder_Append(sbRsaJwk,'34MCdy7cpdTh_YVr7tss2u6vneTwrA86rZtu5Mbr1C1XsmvkxHQAdYo0",');
CkStringBuilder_Append(sbRsaJwk,'"dq":"h_96-mK1R_7glhsum81dZxjTnYynPbZpHziZjeeHcXYsXaaMwkOlODsWa');
CkStringBuilder_Append(sbRsaJwk,'7I9xXDoRwbKgB719rrmI2oKr6N3Do9U0ajaHF-NKJnwgjMd2w9cjz3_-ky');
CkStringBuilder_Append(sbRsaJwk,'NlxAr2v4IKhGNpmM5iIgOS1VZnOZ68m6_pbLBSp3nssTdlqvd0tIiTHU",');
CkStringBuilder_Append(sbRsaJwk,'"qi":"IYd7DHOhrWvxkwPQsRM2tOgrjbcrfvtQJipd-DlcxyVuuM9sQLdgjVk2o');
CkStringBuilder_Append(sbRsaJwk,'y26F0EmpScGLq2MowX7fhd_QJQ3ydy5cY7YIBi87w93IKLEdfnbJtoOPLU');
CkStringBuilder_Append(sbRsaJwk,'W0ITrJReOgo1cq9SbsxYawBgfp_gh6A5603k2-ZQwVK0JKSHuLFkuQ3U"');
CkStringBuilder_Append(sbRsaJwk,'}');

rsaKey := CkPrivateKey_Create();
// Note: This example loads the RSA key from JWK format.  Any format can be loaded
// into the private key object. (See the online reference documentation..)
success := CkPrivateKey_LoadJwk(rsaKey,CkStringBuilder__getAsString(sbRsaJwk));
if (success <> True) then
  begin
    Memo1.Lines.Add(CkPrivateKey__lastErrorText(rsaKey));
    Exit;
  end;

// ---------------------------------------------------
// Use the following ECC key loaded from JWK format.
sbEccJwk := CkStringBuilder_Create();
CkStringBuilder_Append(sbEccJwk,'{"kty":"EC",');
CkStringBuilder_Append(sbEccJwk,'"crv":"P-256",');
CkStringBuilder_Append(sbEccJwk,'"x":"f83OJ3D2xF1Bg8vub9tLe1gHMzV76e8Tus9uPHvRVEU",');
CkStringBuilder_Append(sbEccJwk,'"y":"x_FEzRu9m36HLN_tue659LNpXW6pCyStikYjKIWI5a0",');
CkStringBuilder_Append(sbEccJwk,'"d":"jpsQnnGQmL-YBIffH1136cspYG6-0iY7X1fCE9-E9LI"');
CkStringBuilder_Append(sbEccJwk,'}');

eccKey := CkPrivateKey_Create();
// Note: This example loads the ECDSA key from JWK format.  Any format can be loaded
// into the private key object. (See the online reference documentation..)
success := CkPrivateKey_LoadJwk(eccKey,CkStringBuilder__getAsString(sbEccJwk));
if (success <> True) then
  begin
    Memo1.Lines.Add(CkPrivateKey__lastErrorText(eccKey));
    Exit;
  end;

// ---------------------------------------------------
// The HMAC key (in base64url format)
hmacKey := 'AyM1SysPpbyDfgZld3umj1qzKObwVMkoqQ-EstJQLr_T-1qS0gZH75aKtMN3Yj0iPS4hcgUuTwjAzZr1Z9CAow';

// ---------------------------------------------------
// Prepare the headers..
// RSASSA-PKCS1-v1_5 SHA-256
jwsProtHdr0 := CkJsonObject_Create();
CkJsonObject_AppendString(jwsProtHdr0,'alg','RS256');
jwsUnprotHdr0 := CkJsonObject_Create();
CkJsonObject_AppendString(jwsUnprotHdr0,'kid','myRsaKey');

// ECDSA using P-256 and SHA-256
jwsProtHdr1 := CkJsonObject_Create();
CkJsonObject_AppendString(jwsProtHdr1,'alg','ES256');
jwsUnprotHdr1 := CkJsonObject_Create();
CkJsonObject_AppendString(jwsUnprotHdr1,'kid','myEcKey');

// HMAC using SHA-256
jwsProtHdr2 := CkJsonObject_Create();
CkJsonObject_AppendString(jwsProtHdr2,'alg','HS256');
jwsUnprotHdr2 := CkJsonObject_Create();
CkJsonObject_AppendString(jwsUnprotHdr2,'kid','myMacKey');

// ---------------------------------------------------
// First set the JWS headers, keys, and payload, then we'll create the JWS...
jws := CkJws_Create();

CkJws_SetProtectedHeader(jws,0,jwsProtHdr0);
CkJws_SetUnprotectedHeader(jws,0,jwsUnprotHdr0);
CkJws_SetProtectedHeader(jws,1,jwsProtHdr1);
CkJws_SetUnprotectedHeader(jws,1,jwsUnprotHdr1);
CkJws_SetProtectedHeader(jws,2,jwsProtHdr2);
CkJws_SetUnprotectedHeader(jws,2,jwsUnprotHdr2);

CkJws_SetPrivateKey(jws,0,rsaKey);
CkJws_SetPrivateKey(jws,1,eccKey);
CkJws_SetMacKey(jws,2,hmacKey,'base64url');

bIncludeBom := False;
payloadStr := 'In our village, folks say God crumbles up the old moon into stars.';
CkJws_SetPayload(jws,payloadStr,'utf-8',bIncludeBom);

// ---------------------------------------------------
// Create the JWS.
// Givent that multiple signatures will exist, only the general JSON serialization 
// format is possible, and that is what will be produced.
jwsStr := CkJws__createJws(jws);
if (CkJws_getLastMethodSuccess(jws) <> True) then
  begin
    Memo1.Lines.Add(CkJws__lastErrorText(jws));
    Exit;
  end;

// The jwsStr is contains JSON in the smallest possible size, which is a single line.
// To get in human-readable format, load into a Chilkat JSON object and emit..
json := CkJsonObject_Create();
CkJsonObject_Load(json,jwsStr);
CkJsonObject_putEmitCompact(json,False);
Memo1.Lines.Add(CkJsonObject__emit(json));

// Sample output:

// { 
//   "payload": "SW4gb3VyIHZpbGxhZ2UsIGZvbGtzIHNheSBHb2QgY3J1bWJsZXMgdXAgdGhlIG9sZCBtb29uIGludG8gc3RhcnMu",
//   "signatures": [
//     { 
//       "protected": "eyJhbGciOiJSUzI1NiJ9",
//       "header": { 
//         "kid": "myRsaKey"
//       },
//       "signature": "B04c24gSnpVm1Z-_bemfyNMCpZm6Knj1yB-yzaIOvijsWfDgoF_mSJccTIbzapNgwJudnobr5iDOfZWiRR9iqCyDJLe5M1S40vFF7MFEI3JecYRgrRc6n1lTkYLMRyVq48BwbQlmKgPqmK9drun3agklsr0FmgNx65pfmcnlYdXsgwxf8WbgppefrlrMImp-98-dNtBcUL8ce1aOjbcyVFjGMCzpm3JerQqIzWQvEwBstnMEQle73KHcyx_nsTmlzY70CaydbRTsciOATL7WfiMwuX1q9Y2NIpTg3CbOTWKdwjh7iyfiAKQxNBaF2mApnqj9hjpf8GwR-CfxAzJtPg"
//     },
//     { 
//       "protected": "eyJhbGciOiJFUzI1NiJ9",
//       "header": { 
//         "kid": "myEcKey"
//       },
//       "signature": "2cbugKq0ERaQMh01n2B-86EZFYleeMf8bsccaQMxzOxAg14PxfjR3IImvodTJYqkmfBJYW203etz2-7ZtJUOGw"
//     },
//     { 
//       "protected": "eyJhbGciOiJIUzI1NiJ9",
//       "header": { 
//         "kid": "myMacKey"
//       },
//       "signature": "e7R9gjx0RsUNa3c7qd8k9mQGEhtcG8vsN1W7jbLb2MA"
//     }
//   ]
// }

CkStringBuilder_Dispose(sbRsaJwk);
CkPrivateKey_Dispose(rsaKey);
CkStringBuilder_Dispose(sbEccJwk);
CkPrivateKey_Dispose(eccKey);
CkJsonObject_Dispose(jwsProtHdr0);
CkJsonObject_Dispose(jwsUnprotHdr0);
CkJsonObject_Dispose(jwsProtHdr1);
CkJsonObject_Dispose(jwsUnprotHdr1);
CkJsonObject_Dispose(jwsProtHdr2);
CkJsonObject_Dispose(jwsUnprotHdr2);
CkJws_Dispose(jws);
CkJsonObject_Dispose(json);

end;