102 lines
3.6 KiB
Java
102 lines
3.6 KiB
Java
/*
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* Copyright (C) 2012-2014 Dominik Schürmann <dominik@dominikschuermann.de>
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* Copyright (C) 2010-2014 Thialfihar <thi@thialfihar.org>
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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.pgp;
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import android.content.Context;
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import android.content.pm.PackageInfo;
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import android.content.pm.PackageManager.NameNotFoundException;
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import org.sufficientlysecure.keychain.Constants;
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import org.sufficientlysecure.keychain.R;
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import org.sufficientlysecure.keychain.util.Preferences;
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import org.sufficientlysecure.keychain.util.Log;
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import java.io.File;
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import java.io.IOException;
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import java.io.RandomAccessFile;
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import java.security.SecureRandom;
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import java.util.regex.Pattern;
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public class PgpHelper {
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public static final Pattern PGP_MESSAGE = Pattern.compile(
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".*?(-----BEGIN PGP MESSAGE-----.*?-----END PGP MESSAGE-----).*", Pattern.DOTALL);
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public static final Pattern PGP_CLEARTEXT_SIGNATURE = Pattern
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.compile(".*?(-----BEGIN PGP SIGNED MESSAGE-----.*?-----" +
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"BEGIN PGP SIGNATURE-----.*?-----END PGP SIGNATURE-----).*",
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Pattern.DOTALL);
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public static final Pattern PGP_PUBLIC_KEY = Pattern.compile(
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".*?(-----BEGIN PGP PUBLIC KEY BLOCK-----.*?-----END PGP PUBLIC KEY BLOCK-----).*",
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Pattern.DOTALL);
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public static String getVersion(Context context) {
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String version;
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try {
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PackageInfo pi = context.getPackageManager().getPackageInfo(Constants.PACKAGE_NAME, 0);
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version = pi.versionName;
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return version;
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} catch (NameNotFoundException e) {
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Log.e(Constants.TAG, "Version could not be retrieved!", e);
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return "0.0";
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}
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}
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public static String getVersionForHeader(Context context) {
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if(Preferences.getPreferences(context).getWriteVersionHeader()){
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return "OpenKeychain v" + getVersion(context);
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} else {
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return null;
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}
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}
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/**
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* Deletes file securely by overwriting it with random data before deleting it.
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* <p/>
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* TODO: Does this really help on flash storage?
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*
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* @param context
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* @param progressable
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* @param file
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* @throws IOException
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*/
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public static void deleteFileSecurely(Context context, Progressable progressable, File file)
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throws IOException {
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long length = file.length();
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SecureRandom random = new SecureRandom();
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RandomAccessFile raf = new RandomAccessFile(file, "rws");
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raf.seek(0);
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raf.getFilePointer();
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byte[] data = new byte[1 << 16];
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int pos = 0;
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String msg = context.getString(R.string.progress_deleting_securely, file.getName());
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while (pos < length) {
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if (progressable != null) {
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progressable.setProgress(msg, (int) (100 * pos / length), 100);
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}
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random.nextBytes(data);
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raf.write(data);
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pos += data.length;
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}
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raf.close();
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file.delete();
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}
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}
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