certify: sign individual UIDs

direct signing of pubkeys is out for now. not sure how this should be
handled, but it's trivial to re-add so leaving this up for discussion
for now.

OpenPGP-Keychain/src/main/java/org/sufficientlysecure/keychain/pgp/PgpKeyOperation.java

@@ -408,7 +408,16 @@ public class PgpKeyOperation {
         updateProgress(R.string.progress_done, 100, 100);
     }
 
-    public PGPPublicKeyRing certifyKey(long masterKeyId, long pubKeyId, String passphrase)
+    /**
+     * Certify the given pubkeyid with the given masterkeyid.
+     *
+     * @param masterKeyId Certifying key, must be available as secret key
+     * @param pubKeyId ID of public key to certify
+     * @param userIds User IDs to certify, must not be null or empty
+     * @param passphrase Passphrase of the secret key
+     * @return A keyring with added certifications
+     */
+    public PGPPublicKeyRing certifyKey(long masterKeyId, long pubKeyId, List<String> userIds, String passphrase)
             throws PgpGeneralException, NoSuchAlgorithmException, NoSuchProviderException,
             PGPException, SignatureException {
         if (passphrase == null) {
@@ -437,7 +446,7 @@ public class PgpKeyOperation {
                         .setProvider(Constants.BOUNCY_CASTLE_PROVIDER_NAME);
 
                 signatureGenerator = new PGPSignatureGenerator(contentSignerBuilder);
-                signatureGenerator.init(PGPSignature.DIRECT_KEY, signaturePrivateKey);
+                signatureGenerator.init(PGPSignature.DEFAULT_CERTIFICATION, signaturePrivateKey);
             }
 
             { // supply signatureGenerator with a SubpacketVector
@@ -449,8 +458,11 @@ public class PgpKeyOperation {
             // fetch public key ring, add the certification and return it
             PGPPublicKeyRing pubring = ProviderHelper
                     .getPGPPublicKeyRingByKeyId(mContext, pubKeyId);
-            PGPPublicKey signedKey = PGPPublicKey.addCertification(pubring.getPublicKey(pubKeyId),
+            PGPPublicKey signedKey = pubring.getPublicKey(pubKeyId);
-                    signatureGenerator.generate());
+            for(String userId : new IterableIterator<String>(userIds.iterator())) {
+                PGPSignature sig = signatureGenerator.generateCertification(userId, signedKey);
+                signedKey = PGPPublicKey.addCertification(signedKey, userId, sig);
+            }
             pubring = PGPPublicKeyRing.insertPublicKey(pubring, signedKey);
 
             return pubring;

OpenPGP-Keychain/src/main/java/org/sufficientlysecure/keychain/service/KeychainIntentService.java

@@ -805,7 +805,7 @@ public class KeychainIntentService extends IntentService
                 /* Input */
                 long masterKeyId = data.getLong(CERTIFY_KEY_MASTER_KEY_ID);
                 long pubKeyId = data.getLong(CERTIFY_KEY_PUB_KEY_ID);
-                // String[] userIds = data.getStringArray(CERTIFY_KEY_PUB_KEY_ID);
+                ArrayList<String> userIds = data.getStringArrayList(CERTIFY_KEY_UIDS);
 
                 /* Operation */
                 String signaturePassPhrase = PassphraseCacheService.getCachedPassphrase(this,
@@ -813,7 +813,7 @@ public class KeychainIntentService extends IntentService
 
                 PgpKeyOperation keyOperation = new PgpKeyOperation(this, this);
                 PGPPublicKeyRing signedPubKeyRing = keyOperation.certifyKey(masterKeyId, pubKeyId,
-                        signaturePassPhrase);
+                        userIds, signaturePassPhrase);
 
                 // store the signed key in our local cache
                 PgpImportExport pgpImportExport = new PgpImportExport(this, null);

OpenPGP-Keychain/src/main/java/org/sufficientlysecure/keychain/ui/CertifyKeyActivity.java

@@ -30,14 +30,12 @@ import android.support.v4.content.CursorLoader;
 import android.support.v4.content.Loader;
 import android.support.v7.app.ActionBar;
 import android.support.v7.app.ActionBarActivity;
-import android.text.format.DateFormat;
 import android.view.View;
 import android.view.View.OnClickListener;
 import android.widget.*;
 import android.widget.CompoundButton.OnCheckedChangeListener;
 import com.beardedhen.androidbootstrap.BootstrapButton;
 import org.spongycastle.openpgp.PGPPublicKeyRing;
-import org.spongycastle.openpgp.PGPSignature;
 import org.sufficientlysecure.keychain.Constants;
 import org.sufficientlysecure.keychain.R;
 import org.sufficientlysecure.keychain.helper.OtherHelper;
@@ -53,8 +51,7 @@ import org.sufficientlysecure.keychain.ui.adapter.ViewKeyUserIdsAdapter;
 import org.sufficientlysecure.keychain.ui.dialog.PassphraseDialogFragment;
 import org.sufficientlysecure.keychain.util.Log;
 
-import java.util.Date;
+import java.util.ArrayList;
-import java.util.Iterator;
 
 /**
  * Signs the specified public key with the specified secret master key
@@ -267,6 +264,7 @@ public class CertifyKeyActivity extends ActionBarActivity implements
             // if we have already signed this key, dont bother doing it again
             boolean alreadySigned = false;
 
+            /* todo: reconsider this at a later point when certs are in the db
             @SuppressWarnings("unchecked")
             Iterator<PGPSignature> itr = pubring.getPublicKey(mPubKeyId).getSignatures();
             while (itr.hasNext()) {
@@ -276,6 +274,7 @@ public class CertifyKeyActivity extends ActionBarActivity implements
                     break;
                 }
             }
+            */
 
             if (!alreadySigned) {
                 /*
@@ -303,6 +302,15 @@ public class CertifyKeyActivity extends ActionBarActivity implements
      * kicks off the actual signing process on a background thread
      */
     private void startSigning() {
+
+        // Bail out if there is not at least one user id selected
+        ArrayList<String> userIds = mUserIdsAdapter.getSelectedUserIds();
+        if(userIds.isEmpty()) {
+            Toast.makeText(CertifyKeyActivity.this, "No User IDs to sign selected!",
+                    Toast.LENGTH_SHORT).show();
+            return;
+        }
+
         // Send all information needed to service to sign key in other thread
         Intent intent = new Intent(this, KeychainIntentService.class);
 
@@ -313,8 +321,7 @@ public class CertifyKeyActivity extends ActionBarActivity implements
 
         data.putLong(KeychainIntentService.CERTIFY_KEY_MASTER_KEY_ID, mMasterKeyId);
         data.putLong(KeychainIntentService.CERTIFY_KEY_PUB_KEY_ID, mPubKeyId);
-        data.putStringArray(KeychainIntentService.CERTIFY_KEY_UIDS,
+        data.putStringArrayList(KeychainIntentService.CERTIFY_KEY_UIDS, userIds);
-                (String[]) mUserIdsAdapter.getSelectedUserIds().toArray());
 
         intent.putExtra(KeychainIntentService.EXTRA_DATA, data);