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/**
* Copyright (c) 2013 LEAP Encryption Access Project and contributers
*
* 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 se.leap.bitmaskclient.base.utils;
import android.content.Context;
import android.content.res.Resources;
import android.os.Build;
import android.os.Looper;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.annotation.StringRes;
import org.json.JSONException;
import org.json.JSONObject;
import org.spongycastle.util.encoders.Base64;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.math.BigInteger;
import java.security.KeyFactory;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import java.security.cert.CertificateEncodingException;
import java.security.cert.CertificateException;
import java.security.cert.CertificateFactory;
import java.security.cert.X509Certificate;
import java.security.interfaces.RSAPrivateKey;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.PKCS8EncodedKeySpec;
import java.util.Calendar;
import se.leap.bitmaskclient.BuildConfig;
import se.leap.bitmaskclient.providersetup.ProviderAPI;
import se.leap.bitmaskclient.R;
import static se.leap.bitmaskclient.base.models.Constants.DEFAULT_BITMASK;
/**
* Stores constants, and implements auxiliary methods used across all Bitmask Android classes.
* Wraps BuildConfigFields for to support easier unit testing
*
* @author parmegv
* @author MeanderingCode
*/
public class ConfigHelper {
final public static String NG_1024 =
"eeaf0ab9adb38dd69c33f80afa8fc5e86072618775ff3c0b9ea2314c9c256576d674df7496ea81d3383b4813d692c6e0e0d5d8e250b98be48e495c1d6089dad15dc7d7b46154d6b6ce8ef4ad69b15d4982559b297bcf1885c529f566660e57ec68edbc3c05726cc02fd4cbf4976eaa9afd5138fe8376435b9fc61d2fc0eb06e3";
final public static BigInteger G = new BigInteger("2");
public static boolean checkErroneousDownload(String downloadedString) {
try {
if (downloadedString == null || downloadedString.isEmpty() || new JSONObject(downloadedString).has(ProviderAPI.ERRORS) || new JSONObject(downloadedString).has(ProviderAPI.BACKEND_ERROR_KEY)) {
return true;
} else {
return false;
}
} catch (NullPointerException | JSONException e) {
return false;
}
}
/**
* Treat the input as the MSB representation of a number,
* and lop off leading zero elements. For efficiency, the
* input is simply returned if no leading zeroes are found.
*
* @param in array to be trimmed
*/
public static byte[] trim(byte[] in) {
if (in.length == 0 || in[0] != 0)
return in;
int len = in.length;
int i = 1;
while (in[i] == 0 && i < len)
++i;
byte[] ret = new byte[len - i];
System.arraycopy(in, i, ret, 0, len - i);
return ret;
}
public static X509Certificate parseX509CertificateFromString(String certificateString) {
java.security.cert.Certificate certificate = null;
CertificateFactory cf;
try {
cf = CertificateFactory.getInstance("X.509");
certificateString = certificateString.replaceFirst("-----BEGIN CERTIFICATE-----", "").replaceFirst("-----END CERTIFICATE-----", "").trim();
byte[] cert_bytes = Base64.decode(certificateString);
InputStream caInput = new ByteArrayInputStream(cert_bytes);
try {
certificate = cf.generateCertificate(caInput);
System.out.println("ca=" + ((X509Certificate) certificate).getSubjectDN());
} finally {
caInput.close();
}
} catch (NullPointerException | CertificateException | IOException | IllegalArgumentException e) {
return null;
}
return (X509Certificate) certificate;
}
public static RSAPrivateKey parseRsaKeyFromString(String rsaKeyString) {
RSAPrivateKey key;
try {
KeyFactory kf;
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.P) {
kf = KeyFactory.getInstance("RSA", "BC");
} else {
kf = KeyFactory.getInstance("RSA");
}
rsaKeyString = rsaKeyString.replaceFirst("-----BEGIN RSA PRIVATE KEY-----", "").replaceFirst("-----END RSA PRIVATE KEY-----", "");
PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(Base64.decode(rsaKeyString));
key = (RSAPrivateKey) kf.generatePrivate(keySpec);
} catch (InvalidKeySpecException e) {
// TODO Auto-generated catch block
e.printStackTrace();
return null;
} catch (NoSuchAlgorithmException e) {
// TODO Auto-generated catch block
e.printStackTrace();
return null;
} catch (NullPointerException e) {
e.printStackTrace();
return null;
} catch (NoSuchProviderException e) {
e.printStackTrace();
return null;
}
return key;
}
private static String byteArrayToHex(byte[] input) {
int readBytes = input.length;
StringBuffer hexData = new StringBuffer();
int onebyte;
for (int i = 0; i < readBytes; i++) {
onebyte = ((0x000000ff & input[i]) | 0xffffff00);
hexData.append(Integer.toHexString(onebyte).substring(6));
}
return hexData.toString();
}
/**
* Calculates the hexadecimal representation of a sha256/sha1 fingerprint of a certificate
*
* @param certificate
* @param encoding
* @return
* @throws NoSuchAlgorithmException
* @throws CertificateEncodingException
*/
@NonNull
public static String getFingerprintFromCertificate(X509Certificate certificate, String encoding) throws NoSuchAlgorithmException, CertificateEncodingException /*, UnsupportedEncodingException*/ {
byte[] byteArray = MessageDigest.getInstance(encoding).digest(certificate.getEncoded());
return byteArrayToHex(byteArray);
}
public static void ensureNotOnMainThread(@NonNull Context context) throws IllegalStateException{
Looper looper = Looper.myLooper();
if (looper != null && looper == context.getMainLooper()) {
throw new IllegalStateException(
"calling this from your main thread can lead to deadlock");
}
}
public static boolean isDefaultBitmask() {
return BuildConfig.FLAVOR_branding.equals(DEFAULT_BITMASK);
}
public static boolean preferAnonymousUsage() {
return BuildConfig.priotize_anonymous_usage;
}
public static int getCurrentTimezone() {
return Calendar.getInstance().get(Calendar.ZONE_OFFSET) / 3600000;
}
public static String getProviderFormattedString(Resources resources, @StringRes int resourceId) {
String appName = resources.getString(R.string.app_name);
return resources.getString(resourceId, appName);
}
public static boolean stringEqual(@Nullable String string1, @Nullable String string2) {
return (string1 == null && string2 == null) ||
(string1 != null && string1.equals(string2));
}
public static String getApkFileName() {
try {
return BuildConfig.update_apk_url.substring(BuildConfig.update_apk_url.lastIndexOf("/"));
} catch (Exception e) {
return null;
}
}
public static String getVersionFileName() {
try {
return BuildConfig.version_file_url.substring(BuildConfig.version_file_url.lastIndexOf("/"));
} catch (Exception e) {
return null;
}
}
public static String getSignatureFileName() {
try {
return BuildConfig.signature_url.substring(BuildConfig.signature_url.lastIndexOf("/"));
} catch (Exception e) {
return null;
}
}
}
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