(Android™) Signing HTTP Messages

Demonstrates how to sign HTTP messages per draft-cavage-http-signatures-10

For more information, see https://tools.ietf.org/html/draft-cavage-http-signatures-10

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

    boolean success;

    boolean bCrlf = true;
    CkStringBuilder sbPublicKeyPem = new CkStringBuilder();
    sbPublicKeyPem.AppendLine("-----BEGIN PUBLIC KEY-----",bCrlf);
    sbPublicKeyPem.AppendLine("MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDCFENGw33yGihy92pDjZQhl0C3",bCrlf);
    sbPublicKeyPem.AppendLine("6rPJj+CvfSC8+q28hxA161QFNUd13wuCTUcq0Qd2qsBe/2hFyc2DCJJg0h1L78+6",bCrlf);
    sbPublicKeyPem.AppendLine("Z4UMR7EOcpfdUE9Hf3m/hs+FUR45uBJeDK1HSFHD8bHKD6kv8FPGfJTotc+2xjJw",bCrlf);
    sbPublicKeyPem.AppendLine("oYi+1hqp1fIekaxsyQIDAQAB",bCrlf);
    sbPublicKeyPem.AppendLine("-----END PUBLIC KEY-----",bCrlf);

    CkPublicKey pubKey = new CkPublicKey();
    pubKey.LoadFromString(sbPublicKeyPem.getAsString());

    CkStringBuilder sbPrivateKeyPem = new CkStringBuilder();
    sbPrivateKeyPem.AppendLine("-----BEGIN RSA PRIVATE KEY-----",bCrlf);
    sbPrivateKeyPem.AppendLine("MIICXgIBAAKBgQDCFENGw33yGihy92pDjZQhl0C36rPJj+CvfSC8+q28hxA161QF",bCrlf);
    sbPrivateKeyPem.AppendLine("NUd13wuCTUcq0Qd2qsBe/2hFyc2DCJJg0h1L78+6Z4UMR7EOcpfdUE9Hf3m/hs+F",bCrlf);
    sbPrivateKeyPem.AppendLine("UR45uBJeDK1HSFHD8bHKD6kv8FPGfJTotc+2xjJwoYi+1hqp1fIekaxsyQIDAQAB",bCrlf);
    sbPrivateKeyPem.AppendLine("AoGBAJR8ZkCUvx5kzv+utdl7T5MnordT1TvoXXJGXK7ZZ+UuvMNUCdN2QPc4sBiA",bCrlf);
    sbPrivateKeyPem.AppendLine("QWvLw1cSKt5DsKZ8UETpYPy8pPYnnDEz2dDYiaew9+xEpubyeW2oH4Zx71wqBtOK",bCrlf);
    sbPrivateKeyPem.AppendLine("kqwrXa/pzdpiucRRjk6vE6YY7EBBs/g7uanVpGibOVAEsqH1AkEA7DkjVH28WDUg",bCrlf);
    sbPrivateKeyPem.AppendLine("f1nqvfn2Kj6CT7nIcE3jGJsZZ7zlZmBmHFDONMLUrXR/Zm3pR5m0tCmBqa5RK95u",bCrlf);
    sbPrivateKeyPem.AppendLine("412jt1dPIwJBANJT3v8pnkth48bQo/fKel6uEYyboRtA5/uHuHkZ6FQF7OUkGogc",bCrlf);
    sbPrivateKeyPem.AppendLine("mSJluOdc5t6hI1VsLn0QZEjQZMEOWr+wKSMCQQCC4kXJEsHAve77oP6HtG/IiEn7",bCrlf);
    sbPrivateKeyPem.AppendLine("kpyUXRNvFsDE0czpJJBvL/aRFUJxuRK91jhjC68sA7NsKMGg5OXb5I5Jj36xAkEA",bCrlf);
    sbPrivateKeyPem.AppendLine("gIT7aFOYBFwGgQAQkWNKLvySgKbAZRTeLBacpHMuQdl1DfdntvAyqpAZ0lY0RKmW",bCrlf);
    sbPrivateKeyPem.AppendLine("G6aFKaqQfOXKCyWoUiVknQJAXrlgySFci/2ueKlIE1QqIiLSZ8V8OlpFLRnb1pzI",bCrlf);
    sbPrivateKeyPem.AppendLine("7U1yQXnTAEFYM560yJlzUpOb1V4cScGd365tiSMvxLOvTA==",bCrlf);
    sbPrivateKeyPem.AppendLine("-----END RSA PRIVATE KEY-----",bCrlf);

    CkPrivateKey privKey = new CkPrivateKey();
    privKey.LoadPem(sbPrivateKeyPem.getAsString());

    //    All examples use this request:
    // 
    //    POST /foo?param=value&pet=dog HTTP/1.1
    //    Host: example.com
    //    Date: Sun, 05 Jan 2014 21:31:40 GMT
    //    Content-Type: application/json
    //    Digest: SHA-256=X48E9qOokqqrvdts8nOJRJN3OWDUoyWxBf7kbu9DBPE=
    //    Content-Length: 18
    // 
    //    {"hello": "world"}

    // C.1.  Default Test
    // 
    //    If a list of headers is not included, the date is the only header
    //    that is signed by default.  The string to sign would be:
    // 
    //    date: Sun, 05 Jan 2014 21:31:40 GMT
    // 
    //    The Authorization header would be:
    // 
    //    Authorization: Signature keyId="Test",algorithm="rsa-sha256",
    //    signature="SjWJWbWN7i0wzBvtPl8rbASWz5xQW6mcJmn+ibttBqtifLN7Sazz
    //    6m79cNfwwb8DMJ5cou1s7uEGKKCs+FLEEaDV5lp7q25WqS+lavg7T8hc0GppauB
    //    6hbgEKTwblDHYGEtbGmtdHgVCk9SuS13F0hZ8FD0k/5OxEPXe5WozsbM="
    // 
    //    The Signature header would be:
    // 
    //    Signature: keyId="Test",algorithm="rsa-sha256",
    //    signature="SjWJWbWN7i0wzBvtPl8rbASWz5xQW6mcJmn+ibttBqtifLN7Sazz
    //    6m79cNfwwb8DMJ5cou1s7uEGKKCs+FLEEaDV5lp7q25WqS+lavg7T8hc0GppauB
    //    6hbgEKTwblDHYGEtbGmtdHgVCk9SuS13F0hZ8FD0k/5OxEPXe5WozsbM="
    // 

    CkDateTime dtNow = new CkDateTime();
    success = dtNow.SetFromCurrentSystemTime();
    String dateStr = dtNow.getAsRfc822(false);

    // To duplicate the above result, we'll hard-code the date string.
    dateStr = "Sun, 05 Jan 2014 21:31:40 GMT";

    CkRsa rsa = new CkRsa();
    success = rsa.ImportPrivateKeyObj(privKey);
    if (success == false) {
        Log.i(TAG, rsa.lastErrorText());
        return;
        }

    CkStringBuilder sbStringToSign = new CkStringBuilder();
    sbStringToSign.Append("date: ");
    sbStringToSign.Append(dateStr);

    rsa.put_EncodingMode("base64");
    String b64Signature = rsa.signStringENC(sbStringToSign.getAsString(),"SHA256");
    Log.i(TAG, b64Signature);
    Log.i(TAG, "---------------------------");

    // The result should be:
    // SjWJWbWN7i0wzBvtPl8rbASW ... FD0k/5OxEPXe5WozsbM=

    // ----------------------------------------------------------------------------------------------------

    // C.2.  Basic Test
    // 
    //    The minimum recommended data to sign is the (request-target), host,
    //    and date.  In this case, the string to sign would be:
    // 
    //    (request-target): post /foo?param=value&pet=dog
    //    host: example.com
    //    date: Sun, 05 Jan 2014 21:31:40 GMT
    // 
    //    The Authorization header would be:
    // 
    //    Authorization: Signature keyId="Test",algorithm="rsa-sha256",
    //    headers="(request-target) host date", signature="qdx+H7PHHDZgy4
    //    y/Ahn9Tny9V3GP6YgBPyUXMmoxWtLbHpUnXS2mg2+SbrQDMCJypxBLSPQR2aAjn
    //    7ndmw2iicw3HMbe8VfEdKFYRqzic+efkb3nndiv/x1xSHDJWeSWkx3ButlYSuBs
    //    kLu6kd9Fswtemr3lgdDEmn04swr2Os0="

    sbStringToSign.Clear();
    sbStringToSign.Append("(request-target): ");
    sbStringToSign.AppendLine("post /foo?param=value&pet=dog",false);
    sbStringToSign.Append("host: ");
    sbStringToSign.AppendLine("example.com",false);
    sbStringToSign.Append("date: ");
    sbStringToSign.Append(dateStr);

    Log.i(TAG, "StringToSign:");
    Log.i(TAG, sbStringToSign.getAsString());
    b64Signature = rsa.signStringENC(sbStringToSign.getAsString(),"SHA256");
    Log.i(TAG, b64Signature);
    Log.i(TAG, "---------------------------");

    // The result should be:
    // qdx+H7PHHDZgy4y/Ahn ... mn04swr2Os0=

  }

  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."
  }
}