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/*
* Copyright (C) 2012-2013 Dominik Schürmann <dominik@dominikschuermann.de>
* Copyright (C) 2010 Thialfihar <thi@thialfihar.org>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.sufficientlysecure.keychain.pgp;
import android.content.Context;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager.NameNotFoundException;
import org.spongycastle.openpgp.PGPEncryptedDataList;
import org.spongycastle.openpgp.PGPObjectFactory;
import org.spongycastle.openpgp.PGPPublicKeyEncryptedData;
import org.spongycastle.openpgp.PGPPublicKeyRing;
import org.spongycastle.openpgp.PGPSecretKey;
import org.spongycastle.openpgp.PGPSecretKeyRing;
import org.spongycastle.openpgp.PGPUtil;
import org.sufficientlysecure.keychain.Constants;
import org.sufficientlysecure.keychain.Id;
import org.sufficientlysecure.keychain.R;
import org.sufficientlysecure.keychain.pgp.exception.NoAsymmetricEncryptionException;
import org.sufficientlysecure.keychain.pgp.exception.PgpGeneralException;
import org.sufficientlysecure.keychain.provider.ProviderHelper;
import org.sufficientlysecure.keychain.util.Log;
import org.sufficientlysecure.keychain.util.ProgressDialogUpdater;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.RandomAccessFile;
import java.security.SecureRandom;
import java.util.Iterator;
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);
public static String getVersion(Context context) {
String version = null;
try {
PackageInfo pi = context.getPackageManager().getPackageInfo(Constants.PACKAGE_NAME, 0);
version = pi.versionName;
return version;
} catch (NameNotFoundException e) {
Log.e(Constants.TAG, "Version could not be retrieved!", e);
return "0.0.0";
}
}
public static String getFullVersion(Context context) {
return "OpenPGP Keychain v" + getVersion(context);
}
public static long getDecryptionKeyId(Context context, InputStream inputStream)
throws PgpGeneralException, NoAsymmetricEncryptionException, IOException {
InputStream in = PGPUtil.getDecoderStream(inputStream);
PGPObjectFactory pgpF = new PGPObjectFactory(in);
PGPEncryptedDataList enc;
Object o = pgpF.nextObject();
// the first object might be a PGP marker packet.
if (o instanceof PGPEncryptedDataList) {
enc = (PGPEncryptedDataList) o;
} else {
enc = (PGPEncryptedDataList) pgpF.nextObject();
}
if (enc == null) {
throw new PgpGeneralException(context.getString(R.string.error_invalid_data));
}
// TODO: currently we always only look at the first known key
// find the secret key
PGPSecretKey secretKey = null;
Iterator<?> it = enc.getEncryptedDataObjects();
boolean gotAsymmetricEncryption = false;
while (it.hasNext()) {
Object obj = it.next();
if (obj instanceof PGPPublicKeyEncryptedData) {
gotAsymmetricEncryption = true;
PGPPublicKeyEncryptedData pbe = (PGPPublicKeyEncryptedData) obj;
secretKey = ProviderHelper.getPGPSecretKeyRing(context, pbe.getKeyID()).getSecretKey();
if (secretKey != null) {
break;
}
}
}
if (!gotAsymmetricEncryption) {
throw new NoAsymmetricEncryptionException();
}
if (secretKey == null) {
return Id.key.none;
}
return secretKey.getKeyID();
}
public static int getStreamContent(Context context, InputStream inStream) throws IOException {
InputStream in = PGPUtil.getDecoderStream(inStream);
PGPObjectFactory pgpF = new PGPObjectFactory(in);
Object object = pgpF.nextObject();
while (object != null) {
if (object instanceof PGPPublicKeyRing || object instanceof PGPSecretKeyRing) {
return Id.content.keys;
} else if (object instanceof PGPEncryptedDataList) {
return Id.content.encrypted_data;
}
object = pgpF.nextObject();
}
return Id.content.unknown;
}
/**
* Generate a random filename
*
* @param length
* @return
*/
public static String generateRandomFilename(int length) {
SecureRandom random = new SecureRandom();
byte bytes[] = new byte[length];
random.nextBytes(bytes);
String result = "";
for (int i = 0; i < length; ++i) {
int v = (bytes[i] + 256) % 64;
if (v < 10) {
result += (char) ('0' + v);
} else if (v < 36) {
result += (char) ('A' + v - 10);
} else if (v < 62) {
result += (char) ('a' + v - 36);
} else if (v == 62) {
result += '_';
} else if (v == 63) {
result += '.';
}
}
return result;
}
/**
* Go once through stream to get length of stream. The length is later used to display progress
* when encrypting/decrypting
*
* @param in
* @return
* @throws IOException
*/
public static long getLengthOfStream(InputStream in) throws IOException {
long size = 0;
long n = 0;
byte dummy[] = new byte[0x10000];
while ((n = in.read(dummy)) > 0) {
size += n;
}
return size;
}
/**
* Deletes file securely by overwriting it with random data before deleting it.
* <p/>
* TODO: Does this really help on flash storage?
*
* @param context
* @param progress
* @param file
* @throws IOException
*/
public static void deleteFileSecurely(Context context, ProgressDialogUpdater progress, 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 (progress != null) {
progress.setProgress(msg, (int) (100 * pos / length), 100);
}
random.nextBytes(data);
raf.write(data);
pos += data.length;
}
raf.close();
file.delete();
}
}
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