673 lines
27 KiB
Java
673 lines
27 KiB
Java
/*
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* Copyright (C) 2012-2014 Dominik Schürmann <dominik@dominikschuermann.de>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package org.sufficientlysecure.keychain.provider;
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import android.content.ContentProviderOperation;
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import android.content.ContentResolver;
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import android.content.ContentValues;
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import android.content.Context;
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import android.content.OperationApplicationException;
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import android.database.Cursor;
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import android.net.Uri;
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import android.os.RemoteException;
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import android.support.v4.util.LongSparseArray;
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import org.sufficientlysecure.keychain.Constants;
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import org.sufficientlysecure.keychain.pgp.KeyRing;
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import org.sufficientlysecure.keychain.pgp.PgpHelper;
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import org.sufficientlysecure.keychain.pgp.PgpKeyHelper;
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import org.sufficientlysecure.keychain.pgp.UncachedKeyRing;
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import org.sufficientlysecure.keychain.pgp.UncachedPublicKey;
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import org.sufficientlysecure.keychain.pgp.WrappedPublicKeyRing;
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import org.sufficientlysecure.keychain.pgp.WrappedSecretKeyRing;
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import org.sufficientlysecure.keychain.pgp.WrappedSignature;
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import org.sufficientlysecure.keychain.pgp.exception.PgpGeneralException;
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import org.sufficientlysecure.keychain.provider.KeychainContract.ApiApps;
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import org.sufficientlysecure.keychain.provider.KeychainContract.Certs;
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import org.sufficientlysecure.keychain.provider.KeychainContract.KeyRingData;
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import org.sufficientlysecure.keychain.provider.KeychainContract.KeyRings;
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import org.sufficientlysecure.keychain.provider.KeychainContract.Keys;
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import org.sufficientlysecure.keychain.provider.KeychainContract.UserIds;
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import org.sufficientlysecure.keychain.remote.AccountSettings;
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import org.sufficientlysecure.keychain.remote.AppSettings;
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import org.sufficientlysecure.keychain.util.IterableIterator;
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import org.sufficientlysecure.keychain.util.Log;
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import java.io.ByteArrayOutputStream;
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import java.io.IOException;
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.Date;
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import java.util.HashMap;
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import java.util.HashSet;
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import java.util.List;
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import java.util.Set;
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public class ProviderHelper {
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private Context mContext;
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private ContentResolver mContentResolver;
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public ProviderHelper(Context context) {
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this.mContext = context;
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this.mContentResolver = context.getContentResolver();
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}
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public static class NotFoundException extends Exception {
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public NotFoundException() {
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}
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public NotFoundException(String name) {
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super(name);
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}
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}
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// If we ever switch to api level 11, we can ditch this whole mess!
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public static final int FIELD_TYPE_NULL = 1;
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// this is called integer to stay coherent with the constants in Cursor (api level 11)
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public static final int FIELD_TYPE_INTEGER = 2;
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public static final int FIELD_TYPE_FLOAT = 3;
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public static final int FIELD_TYPE_STRING = 4;
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public static final int FIELD_TYPE_BLOB = 5;
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public Object getGenericData(Uri uri, String column, int type) throws NotFoundException {
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return getGenericData(uri, new String[]{column}, new int[]{type}).get(column);
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}
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public HashMap<String, Object> getGenericData(Uri uri, String[] proj, int[] types)
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throws NotFoundException {
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Cursor cursor = mContentResolver.query(uri, proj, null, null, null);
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try {
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HashMap<String, Object> result = new HashMap<String, Object>(proj.length);
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if (cursor != null && cursor.moveToFirst()) {
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int pos = 0;
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for (String p : proj) {
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switch (types[pos]) {
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case FIELD_TYPE_NULL:
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result.put(p, cursor.isNull(pos));
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break;
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case FIELD_TYPE_INTEGER:
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result.put(p, cursor.getLong(pos));
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break;
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case FIELD_TYPE_FLOAT:
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result.put(p, cursor.getFloat(pos));
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break;
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case FIELD_TYPE_STRING:
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result.put(p, cursor.getString(pos));
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break;
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case FIELD_TYPE_BLOB:
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result.put(p, cursor.getBlob(pos));
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break;
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}
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pos += 1;
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}
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}
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return result;
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} finally {
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if (cursor != null) {
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cursor.close();
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}
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}
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}
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public Object getUnifiedData(long masterKeyId, String column, int type)
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throws NotFoundException {
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return getUnifiedData(masterKeyId, new String[]{column}, new int[]{type}).get(column);
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}
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public HashMap<String, Object> getUnifiedData(long masterKeyId, String[] proj, int[] types)
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throws NotFoundException {
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return getGenericData(KeyRings.buildUnifiedKeyRingUri(masterKeyId), proj, types);
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}
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private LongSparseArray<UncachedPublicKey> getUncachedMasterKeys(Uri queryUri) {
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Cursor cursor = mContentResolver.query(queryUri,
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new String[]{KeyRingData.MASTER_KEY_ID, KeyRingData.KEY_RING_DATA},
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null, null, null);
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LongSparseArray<UncachedPublicKey> result =
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new LongSparseArray<UncachedPublicKey>(cursor.getCount());
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try {
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if (cursor != null && cursor.moveToFirst()) do {
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long masterKeyId = cursor.getLong(0);
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byte[] data = cursor.getBlob(1);
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if (data != null) {
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try {
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result.put(masterKeyId,
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UncachedKeyRing.decodePublicFromData(data).getPublicKey());
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} catch(PgpGeneralException e) {
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Log.e(Constants.TAG, "Error parsing keyring, skipping.");
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} catch(IOException e) {
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Log.e(Constants.TAG, "IO error, skipping keyring");
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}
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}
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} while (cursor.moveToNext());
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} finally {
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if (cursor != null) {
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cursor.close();
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}
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}
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return result;
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}
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public CachedPublicKeyRing getCachedPublicKeyRing(Uri queryUri) {
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return new CachedPublicKeyRing(this, queryUri);
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}
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public WrappedPublicKeyRing getWrappedPublicKeyRing(long id) throws NotFoundException {
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return (WrappedPublicKeyRing) getWrappedKeyRing(KeyRings.buildUnifiedKeyRingUri(id), false);
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}
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public WrappedPublicKeyRing getWrappedPublicKeyRing(Uri queryUri) throws NotFoundException {
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return (WrappedPublicKeyRing) getWrappedKeyRing(queryUri, false);
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}
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public WrappedSecretKeyRing getWrappedSecretKeyRing(long id) throws NotFoundException {
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return (WrappedSecretKeyRing) getWrappedKeyRing(KeyRings.buildUnifiedKeyRingUri(id), true);
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}
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public WrappedSecretKeyRing getWrappedSecretKeyRing(Uri queryUri) throws NotFoundException {
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return (WrappedSecretKeyRing) getWrappedKeyRing(queryUri, true);
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}
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private KeyRing getWrappedKeyRing(Uri queryUri, boolean secret) throws NotFoundException {
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Cursor cursor = mContentResolver.query(queryUri,
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new String[]{
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// we pick from cache only information that is not easily available from keyrings
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KeyRings.HAS_ANY_SECRET, KeyRings.VERIFIED,
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// and of course, ring data
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secret ? KeyRings.PRIVKEY_DATA : KeyRings.PUBKEY_DATA
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}, null, null, null
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);
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try {
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if (cursor != null && cursor.moveToFirst()) {
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boolean hasAnySecret = cursor.getInt(0) > 0;
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int verified = cursor.getInt(1);
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byte[] blob = cursor.getBlob(2);
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if(secret &! hasAnySecret) {
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throw new NotFoundException("Secret key not available!");
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}
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return secret
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? new WrappedSecretKeyRing(blob, hasAnySecret, verified)
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: new WrappedPublicKeyRing(blob, hasAnySecret, verified);
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} else {
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throw new NotFoundException("Key not found!");
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}
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} finally {
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if (cursor != null) {
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cursor.close();
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}
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}
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}
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/**
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* Saves PGPPublicKeyRing with its keys and userIds in DB
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*/
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@SuppressWarnings("unchecked")
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public void savePublicKeyRing(UncachedKeyRing keyRing) throws IOException {
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if (keyRing.isSecret()) {
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throw new RuntimeException("Tried to save secret keyring as public! " +
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"This is a bug, please file a bug report.");
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}
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UncachedPublicKey masterKey = keyRing.getPublicKey();
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long masterKeyId = masterKey.getKeyId();
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// IF there is a secret key, preserve it!
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UncachedKeyRing secretRing = null;
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try {
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secretRing = getWrappedSecretKeyRing(masterKeyId).getUncached();
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} catch (NotFoundException e) {
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Log.e(Constants.TAG, "key not found!");
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}
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// delete old version of this keyRing, which also deletes all keys and userIds on cascade
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try {
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mContentResolver.delete(KeyRingData.buildPublicKeyRingUri(Long.toString(masterKeyId)), null, null);
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} catch (UnsupportedOperationException e) {
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Log.e(Constants.TAG, "Key could not be deleted! Maybe we are creating a new one!", e);
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}
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// insert new version of this keyRing
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ContentValues values = new ContentValues();
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values.put(KeyRingData.MASTER_KEY_ID, masterKeyId);
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values.put(KeyRingData.KEY_RING_DATA, keyRing.getEncoded());
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Uri uri = KeyRingData.buildPublicKeyRingUri(Long.toString(masterKeyId));
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mContentResolver.insert(uri, values);
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// save all keys and userIds included in keyRing object in database
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ArrayList<ContentProviderOperation> operations = new ArrayList<ContentProviderOperation>();
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int rank = 0;
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for (UncachedPublicKey key : new IterableIterator<UncachedPublicKey>(keyRing.getPublicKeys())) {
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operations.add(buildPublicKeyOperations(masterKeyId, key, rank));
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++rank;
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}
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// get a list of owned secret keys, for verification filtering
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LongSparseArray<UncachedPublicKey> allKeyRings =
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getUncachedMasterKeys(KeyRingData.buildSecretKeyRingUri());
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// special case: available secret keys verify themselves!
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if (secretRing != null) {
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allKeyRings.put(secretRing.getMasterKeyId(), secretRing.getPublicKey());
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}
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// classify and order user ids. primary are moved to the front, revoked to the back,
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// otherwise the order in the keyfile is preserved.
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List<UserIdItem> uids = new ArrayList<UserIdItem>();
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for (String userId : new IterableIterator<String>(
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masterKey.getUnorderedUserIds().iterator())) {
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UserIdItem item = new UserIdItem();
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uids.add(item);
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item.userId = userId;
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// look through signatures for this specific key
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for (WrappedSignature cert : new IterableIterator<WrappedSignature>(
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masterKey.getSignaturesForId(userId))) {
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long certId = cert.getKeyId();
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try {
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// self signature
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if (certId == masterKeyId) {
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cert.init(masterKey);
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if (!cert.verifySignature(masterKey, userId)) {
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// not verified?! dang! TODO notify user? this is kinda serious...
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Log.e(Constants.TAG, "Could not verify self signature for " + userId + "!");
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continue;
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}
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// is this the first, or a more recent certificate?
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if (item.selfCert == null ||
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item.selfCert.getCreationTime().before(cert.getCreationTime())) {
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item.selfCert = cert;
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item.isPrimary = cert.isPrimaryUserId();
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item.isRevoked = cert.isRevocation();
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}
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}
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// verify signatures from known private keys
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if (allKeyRings.indexOfKey(certId) >= 0) {
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cert.init(allKeyRings.get(certId));
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if (cert.verifySignature(masterKey, userId)) {
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item.trustedCerts.add(cert);
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}
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}
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} catch (PgpGeneralException e) {
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Log.e(Constants.TAG, "Signature verification failed! "
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+ PgpKeyHelper.convertKeyIdToHex(masterKey.getKeyId())
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+ " from "
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+ PgpKeyHelper.convertKeyIdToHex(cert.getKeyId()), e);
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}
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}
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}
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// primary before regular before revoked (see UserIdItem.compareTo)
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// this is a stable sort, so the order of keys is otherwise preserved.
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Collections.sort(uids);
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// iterate and put into db
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for (int userIdRank = 0; userIdRank < uids.size(); userIdRank++) {
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UserIdItem item = uids.get(userIdRank);
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operations.add(buildUserIdOperations(masterKeyId, item, userIdRank));
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// no self cert is bad, but allowed by the rfc...
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if (item.selfCert != null) {
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operations.add(buildCertOperations(
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masterKeyId, userIdRank, item.selfCert, Certs.VERIFIED_SELF));
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}
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// don't bother with trusted certs if the uid is revoked, anyways
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if (item.isRevoked) {
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continue;
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}
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for (int i = 0; i < item.trustedCerts.size(); i++) {
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operations.add(buildCertOperations(
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masterKeyId, userIdRank, item.trustedCerts.get(i), Certs.VERIFIED_SECRET));
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}
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}
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try {
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mContentResolver.applyBatch(KeychainContract.CONTENT_AUTHORITY, operations);
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} catch (RemoteException e) {
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Log.e(Constants.TAG, "applyBatch failed!", e);
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} catch (OperationApplicationException e) {
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Log.e(Constants.TAG, "applyBatch failed!", e);
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}
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// Save the saved keyring (if any)
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if (secretRing != null) {
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saveSecretKeyRing(secretRing);
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}
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}
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private static class UserIdItem implements Comparable<UserIdItem> {
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String userId;
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boolean isPrimary = false;
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boolean isRevoked = false;
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WrappedSignature selfCert;
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List<WrappedSignature> trustedCerts = new ArrayList<WrappedSignature>();
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@Override
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public int compareTo(UserIdItem o) {
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// if one key is primary but the other isn't, the primary one always comes first
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if (isPrimary != o.isPrimary) {
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return isPrimary ? -1 : 1;
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}
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// revoked keys always come last!
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if (isRevoked != o.isRevoked) {
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return isRevoked ? 1 : -1;
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}
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return 0;
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}
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}
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/**
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* Saves a PGPSecretKeyRing in the DB. This will only work if a corresponding public keyring
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* is already in the database!
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*/
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public void saveSecretKeyRing(UncachedKeyRing keyRing) throws IOException {
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if (!keyRing.isSecret()) {
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throw new RuntimeException("Tried to save publkc keyring as secret! " +
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"This is a bug, please file a bug report.");
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}
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long masterKeyId = keyRing.getMasterKeyId();
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{
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Uri uri = Keys.buildKeysUri(Long.toString(masterKeyId));
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// first, mark all keys as not available
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ContentValues values = new ContentValues();
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values.put(Keys.HAS_SECRET, 0);
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mContentResolver.update(uri, values, null, null);
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values.put(Keys.HAS_SECRET, 1);
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// then, mark exactly the keys we have available
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for (Long sub : new IterableIterator<Long>(keyRing.getAvailableSubkeys().iterator())) {
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mContentResolver.update(uri, values, Keys.KEY_ID + " = ?", new String[] {
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Long.toString(sub)
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});
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}
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// this implicitly leaves all keys which were not in the secret key ring
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// with has_secret = 0
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}
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// save secret keyring
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{
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ContentValues values = new ContentValues();
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values.put(KeyRingData.MASTER_KEY_ID, masterKeyId);
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values.put(KeyRingData.KEY_RING_DATA, keyRing.getEncoded());
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// insert new version of this keyRing
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Uri uri = KeyRingData.buildSecretKeyRingUri(Long.toString(masterKeyId));
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mContentResolver.insert(uri, values);
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}
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}
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/**
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* Saves (or updates) a pair of public and secret KeyRings in the database
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*/
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public void saveKeyRing(UncachedKeyRing pubRing, UncachedKeyRing secRing) throws IOException {
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long masterKeyId = pubRing.getPublicKey().getKeyId();
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// delete secret keyring (so it isn't unnecessarily saved by public-savePublicKeyRing below)
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mContentResolver.delete(KeyRingData.buildSecretKeyRingUri(Long.toString(masterKeyId)), null, null);
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// save public keyring
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savePublicKeyRing(pubRing);
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saveSecretKeyRing(secRing);
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}
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/**
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* Build ContentProviderOperation to add PGPPublicKey to database corresponding to a keyRing
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*/
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private ContentProviderOperation
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buildPublicKeyOperations(long masterKeyId, UncachedPublicKey key, int rank) throws IOException {
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ContentValues values = new ContentValues();
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values.put(Keys.MASTER_KEY_ID, masterKeyId);
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values.put(Keys.RANK, rank);
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values.put(Keys.KEY_ID, key.getKeyId());
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values.put(Keys.KEY_SIZE, key.getBitStrength());
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values.put(Keys.ALGORITHM, key.getAlgorithm());
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values.put(Keys.FINGERPRINT, key.getFingerprint());
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values.put(Keys.CAN_CERTIFY, key.canCertify());
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values.put(Keys.CAN_SIGN, key.canSign());
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values.put(Keys.CAN_ENCRYPT, key.canEncrypt());
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values.put(Keys.IS_REVOKED, key.maybeRevoked());
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values.put(Keys.CREATION, key.getCreationTime().getTime() / 1000);
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Date expiryDate = key.getExpiryTime();
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if (expiryDate != null) {
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values.put(Keys.EXPIRY, expiryDate.getTime() / 1000);
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}
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Uri uri = Keys.buildKeysUri(Long.toString(masterKeyId));
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return ContentProviderOperation.newInsert(uri).withValues(values).build();
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}
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/**
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* Build ContentProviderOperation to add PGPPublicKey to database corresponding to a keyRing
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*/
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private ContentProviderOperation
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buildCertOperations(long masterKeyId, int rank, WrappedSignature cert, int verified)
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throws IOException {
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ContentValues values = new ContentValues();
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values.put(Certs.MASTER_KEY_ID, masterKeyId);
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values.put(Certs.RANK, rank);
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values.put(Certs.KEY_ID_CERTIFIER, cert.getKeyId());
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values.put(Certs.TYPE, cert.getSignatureType());
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values.put(Certs.CREATION, cert.getCreationTime().getTime() / 1000);
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values.put(Certs.VERIFIED, verified);
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values.put(Certs.DATA, cert.getEncoded());
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Uri uri = Certs.buildCertsUri(Long.toString(masterKeyId));
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return ContentProviderOperation.newInsert(uri).withValues(values).build();
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}
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/**
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* Build ContentProviderOperation to add PublicUserIds to database corresponding to a keyRing
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*/
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private ContentProviderOperation
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buildUserIdOperations(long masterKeyId, UserIdItem item, int rank) {
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ContentValues values = new ContentValues();
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values.put(UserIds.MASTER_KEY_ID, masterKeyId);
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values.put(UserIds.USER_ID, item.userId);
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values.put(UserIds.IS_PRIMARY, item.isPrimary);
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values.put(UserIds.IS_REVOKED, item.isRevoked);
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values.put(UserIds.RANK, rank);
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Uri uri = UserIds.buildUserIdsUri(Long.toString(masterKeyId));
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return ContentProviderOperation.newInsert(uri).withValues(values).build();
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}
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private String getKeyRingAsArmoredString(byte[] data) throws IOException, PgpGeneralException {
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UncachedKeyRing keyRing = UncachedKeyRing.decodeFromData(data);
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ByteArrayOutputStream bos = new ByteArrayOutputStream();
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keyRing.encodeArmored(bos, PgpHelper.getFullVersion(mContext));
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String armoredKey = bos.toString("UTF-8");
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Log.d(Constants.TAG, "armoredKey:" + armoredKey);
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return armoredKey;
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}
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public String getKeyRingAsArmoredString(Uri uri)
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throws NotFoundException, IOException, PgpGeneralException {
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byte[] data = (byte[]) getGenericData(
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uri, KeyRingData.KEY_RING_DATA, ProviderHelper.FIELD_TYPE_BLOB);
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return getKeyRingAsArmoredString(data);
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}
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public ArrayList<String> getRegisteredApiApps() {
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Cursor cursor = mContentResolver.query(ApiApps.CONTENT_URI, null, null, null, null);
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ArrayList<String> packageNames = new ArrayList<String>();
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try {
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if (cursor != null) {
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int packageNameCol = cursor.getColumnIndex(ApiApps.PACKAGE_NAME);
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if (cursor.moveToFirst()) {
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do {
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packageNames.add(cursor.getString(packageNameCol));
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} while (cursor.moveToNext());
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}
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}
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} finally {
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if (cursor != null) {
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cursor.close();
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}
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}
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return packageNames;
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}
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private ContentValues contentValueForApiApps(AppSettings appSettings) {
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ContentValues values = new ContentValues();
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values.put(ApiApps.PACKAGE_NAME, appSettings.getPackageName());
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values.put(ApiApps.PACKAGE_SIGNATURE, appSettings.getPackageSignature());
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return values;
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}
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private ContentValues contentValueForApiAccounts(AccountSettings accSettings) {
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ContentValues values = new ContentValues();
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values.put(KeychainContract.ApiAccounts.ACCOUNT_NAME, accSettings.getAccountName());
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values.put(KeychainContract.ApiAccounts.KEY_ID, accSettings.getKeyId());
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values.put(KeychainContract.ApiAccounts.COMPRESSION, accSettings.getCompression());
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values.put(KeychainContract.ApiAccounts.ENCRYPTION_ALGORITHM, accSettings.getEncryptionAlgorithm());
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values.put(KeychainContract.ApiAccounts.HASH_ALORITHM, accSettings.getHashAlgorithm());
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return values;
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}
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public void insertApiApp(AppSettings appSettings) {
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mContentResolver.insert(KeychainContract.ApiApps.CONTENT_URI,
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contentValueForApiApps(appSettings));
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}
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public void insertApiAccount(Uri uri, AccountSettings accSettings) {
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mContentResolver.insert(uri, contentValueForApiAccounts(accSettings));
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}
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public void updateApiAccount(AccountSettings accSettings, Uri uri) {
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if (mContentResolver.update(uri, contentValueForApiAccounts(accSettings), null,
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null) <= 0) {
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throw new RuntimeException();
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}
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}
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/**
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* Must be an uri pointing to an account
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*
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* @param uri
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* @return
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*/
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public AppSettings getApiAppSettings(Uri uri) {
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AppSettings settings = null;
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Cursor cursor = mContentResolver.query(uri, null, null, null, null);
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try {
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if (cursor != null && cursor.moveToFirst()) {
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settings = new AppSettings();
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settings.setPackageName(cursor.getString(
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cursor.getColumnIndex(KeychainContract.ApiApps.PACKAGE_NAME)));
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settings.setPackageSignature(cursor.getBlob(
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cursor.getColumnIndex(KeychainContract.ApiApps.PACKAGE_SIGNATURE)));
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}
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} finally {
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if (cursor != null) {
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cursor.close();
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}
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}
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return settings;
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}
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public AccountSettings getApiAccountSettings(Uri accountUri) {
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AccountSettings settings = null;
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Cursor cursor = mContentResolver.query(accountUri, null, null, null, null);
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try {
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if (cursor != null && cursor.moveToFirst()) {
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settings = new AccountSettings();
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settings.setAccountName(cursor.getString(
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cursor.getColumnIndex(KeychainContract.ApiAccounts.ACCOUNT_NAME)));
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settings.setKeyId(cursor.getLong(
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cursor.getColumnIndex(KeychainContract.ApiAccounts.KEY_ID)));
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settings.setCompression(cursor.getInt(
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cursor.getColumnIndexOrThrow(KeychainContract.ApiAccounts.COMPRESSION)));
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settings.setHashAlgorithm(cursor.getInt(
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cursor.getColumnIndexOrThrow(KeychainContract.ApiAccounts.HASH_ALORITHM)));
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settings.setEncryptionAlgorithm(cursor.getInt(
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cursor.getColumnIndexOrThrow(KeychainContract.ApiAccounts.ENCRYPTION_ALGORITHM)));
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}
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} finally {
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if (cursor != null) {
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cursor.close();
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}
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}
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return settings;
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}
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public Set<Long> getAllKeyIdsForApp(Uri uri) {
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Set<Long> keyIds = new HashSet<Long>();
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Cursor cursor = mContentResolver.query(uri, null, null, null, null);
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try {
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if (cursor != null) {
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int keyIdColumn = cursor.getColumnIndex(KeychainContract.ApiAccounts.KEY_ID);
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while (cursor.moveToNext()) {
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keyIds.add(cursor.getLong(keyIdColumn));
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}
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}
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} finally {
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if (cursor != null) {
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cursor.close();
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}
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}
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return keyIds;
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}
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public byte[] getApiAppSignature(String packageName) {
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Uri queryUri = ApiApps.buildByPackageNameUri(packageName);
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String[] projection = new String[]{ApiApps.PACKAGE_SIGNATURE};
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Cursor cursor = mContentResolver.query(queryUri, projection, null, null, null);
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try {
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byte[] signature = null;
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if (cursor != null && cursor.moveToFirst()) {
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int signatureCol = 0;
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signature = cursor.getBlob(signatureCol);
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}
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return signature;
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} finally {
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if (cursor != null) {
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cursor.close();
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}
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}
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}
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}
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