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/*
* Copyright (C) 2012-2014 Dominik Schürmann <dominik@dominikschuermann.de>
* Copyright (C) 2010-2014 Thialfihar <thi@thialfihar.org>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.sufficientlysecure.keychain.pgp;
import android.content.Context;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager.NameNotFoundException;
import android.support.annotation.NonNull;
import android.text.TextUtils;
import org.sufficientlysecure.keychain.Constants;
import org.sufficientlysecure.keychain.R;
import org.sufficientlysecure.keychain.util.Log;
import org.sufficientlysecure.keychain.util.Preferences;
import java.io.File;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.security.SecureRandom;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class PgpHelper {
public static final Pattern PGP_MESSAGE = Pattern.compile(
".*?(-----BEGIN PGP MESSAGE-----.*?-----END PGP MESSAGE-----).*", Pattern.DOTALL);
public static final Pattern PGP_CLEARTEXT_SIGNATURE = Pattern
.compile(".*?(-----BEGIN PGP SIGNED MESSAGE-----.*?-----" +
"BEGIN PGP SIGNATURE-----.*?-----END PGP SIGNATURE-----).*",
Pattern.DOTALL);
public static final Pattern PGP_PUBLIC_KEY = Pattern.compile(
".*?(-----BEGIN PGP PUBLIC KEY BLOCK-----.*?-----END PGP PUBLIC KEY BLOCK-----).*",
Pattern.DOTALL);
/**
* Deletes file securely by overwriting it with random data before deleting it.
* <p/>
* TODO: Does this really help on flash storage?
*
* @throws IOException
*/
public static void deleteFileSecurely(Context context, Progressable progressable, File file)
throws IOException {
long length = file.length();
SecureRandom random = new SecureRandom();
RandomAccessFile raf = new RandomAccessFile(file, "rws");
raf.seek(0);
raf.getFilePointer();
byte[] data = new byte[1 << 16];
int pos = 0;
String msg = context.getString(R.string.progress_deleting_securely, file.getName());
while (pos < length) {
if (progressable != null) {
progressable.setProgress(msg, (int) (100 * pos / length), 100);
}
random.nextBytes(data);
raf.write(data);
pos += data.length;
}
raf.close();
file.delete();
}
/**
* Fixing broken PGP MESSAGE Strings coming from GMail/AOSP Mail
*/
public static String fixPgpMessage(String message) {
// windows newline -> unix newline
message = message.replaceAll("\r\n", "\n");
// Mac OS before X newline -> unix newline
message = message.replaceAll("\r", "\n");
// remove whitespaces before newline
message = message.replaceAll(" +\n", "\n");
// only two consecutive newlines are allowed
message = message.replaceAll("\n\n+", "\n\n");
// replace non breakable spaces
message = message.replaceAll("\\xa0", " ");
return message;
}
/**
* Fixing broken PGP SIGNED MESSAGE Strings coming from GMail/AOSP Mail
*/
public static String fixPgpCleartextSignature(CharSequence input) {
if (!TextUtils.isEmpty(input)) {
String text = input.toString();
// windows newline -> unix newline
text = text.replaceAll("\r\n", "\n");
// Mac OS before X newline -> unix newline
text = text.replaceAll("\r", "\n");
return text;
} else {
return null;
}
}
public static String getPgpMessageContent(@NonNull CharSequence input) {
Log.dEscaped(Constants.TAG, "input: " + input);
Matcher matcher = PgpHelper.PGP_MESSAGE.matcher(input);
if (matcher.matches()) {
String text = matcher.group(1);
text = fixPgpMessage(text);
Log.dEscaped(Constants.TAG, "input fixed: " + text);
return text;
} else {
matcher = PgpHelper.PGP_CLEARTEXT_SIGNATURE.matcher(input);
if (matcher.matches()) {
String text = matcher.group(1);
text = fixPgpCleartextSignature(text);
Log.dEscaped(Constants.TAG, "input fixed: " + text);
return text;
} else {
return null;
}
}
}
public static String getPgpKeyContent(@NonNull CharSequence input) {
Log.dEscaped(Constants.TAG, "input: " + input);
Matcher matcher = PgpHelper.PGP_PUBLIC_KEY.matcher(input);
if (matcher.matches()) {
String text = matcher.group(1);
text = fixPgpMessage(text);
Log.dEscaped(Constants.TAG, "input fixed: " + text);
return text;
}
return null;
}
}
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