(Android™) 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 Android™ Downloads Android™ Java Libraries Android C/C++ Libraries

// Important: Don't forget to include the call to System.loadLibrary
// as shown at the bottom of this code sample.
package com.test;

import android.app.Activity;
import com.chilkatsoft.*;

import android.widget.TextView;
import android.os.Bundle;

public class SimpleActivity extends Activity {

  private static final String TAG = "Chilkat";

  // Called when the activity is first created.
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

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

    CkPrivateKey rsaKey = new CkPrivateKey();
    // 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..)
    boolean success = rsaKey.LoadJwk(sbRsaJwk.getAsString());
    if (success != true) {
        Log.i(TAG, rsaKey.lastErrorText());
        return;
        }

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

    CkPrivateKey eccKey = new CkPrivateKey();
    // 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 = eccKey.LoadJwk(sbEccJwk.getAsString());
    if (success != true) {
        Log.i(TAG, eccKey.lastErrorText());
        return;
        }

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

    // ---------------------------------------------------
    // Prepare the headers..
    // RSASSA-PKCS1-v1_5 SHA-256
    CkJsonObject jwsProtHdr0 = new CkJsonObject();
    jwsProtHdr0.AppendString("alg","RS256");
    CkJsonObject jwsUnprotHdr0 = new CkJsonObject();
    jwsUnprotHdr0.AppendString("kid","myRsaKey");

    // ECDSA using P-256 and SHA-256
    CkJsonObject jwsProtHdr1 = new CkJsonObject();
    jwsProtHdr1.AppendString("alg","ES256");
    CkJsonObject jwsUnprotHdr1 = new CkJsonObject();
    jwsUnprotHdr1.AppendString("kid","myEcKey");

    // HMAC using SHA-256
    CkJsonObject jwsProtHdr2 = new CkJsonObject();
    jwsProtHdr2.AppendString("alg","HS256");
    CkJsonObject jwsUnprotHdr2 = new CkJsonObject();
    jwsUnprotHdr2.AppendString("kid","myMacKey");

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

    jws.SetProtectedHeader(0,jwsProtHdr0);
    jws.SetUnprotectedHeader(0,jwsUnprotHdr0);
    jws.SetProtectedHeader(1,jwsProtHdr1);
    jws.SetUnprotectedHeader(1,jwsUnprotHdr1);
    jws.SetProtectedHeader(2,jwsProtHdr2);
    jws.SetUnprotectedHeader(2,jwsUnprotHdr2);

    jws.SetPrivateKey(0,rsaKey);
    jws.SetPrivateKey(1,eccKey);
    jws.SetMacKey(2,hmacKey,"base64url");

    boolean bIncludeBom = false;
    String payloadStr = "In our village, folks say God crumbles up the old moon into stars.";
    jws.SetPayload(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.
    String jwsStr = jws.createJws();
    if (jws.get_LastMethodSuccess() != true) {
        Log.i(TAG, jws.lastErrorText());
        return;
        }

    // 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..
    CkJsonObject json = new CkJsonObject();
    json.Load(jwsStr);
    json.put_EmitCompact(false);
    Log.i(TAG, json.emit());

    // 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"
    //     }
    //   ]
    // }

  }

  static {
      System.loadLibrary("chilkat");

      // Note: If the incorrect library name is passed to System.loadLibrary,
      // then you will see the following error message at application startup:
      //"The application <your-application-name> has stopped unexpectedly. Please try again."
  }
}