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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;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.math.BigInteger;
import java.lang.IllegalArgumentException;
import java.security.KeyFactory;
import java.security.KeyStore;
import java.security.KeyStoreException;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
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 org.json.JSONException;
import org.json.JSONObject;
import android.content.Context;
import android.content.SharedPreferences;
import android.util.Base64;
/**
* Stores constants, and implements auxiliary methods used across all LEAP Android classes.
*
* @author parmegv
* @author MeanderingCode
*
*/
public class ConfigHelper {
private static KeyStore keystore_trusted;
final public static String NG_1024 =
"eeaf0ab9adb38dd69c33f80afa8fc5e86072618775ff3c0b9ea2314c9c256576d674df7496ea81d3383b4813d692c6e0e0d5d8e250b98be48e495c1d6089dad15dc7d7b46154d6b6ce8ef4ad69b15d4982559b297bcf1885c529f566660e57ec68edbc3c05726cc02fd4cbf4976eaa9afd5138fe8376435b9fc61d2fc0eb06e3";
final public static BigInteger G = new BigInteger("2");
public static boolean checkErroneousDownload(String downloaded_string) {
try {
if(new JSONObject(downloaded_string).has(ProviderAPI.ERRORS) || downloaded_string.isEmpty()) {
return true;
} else {
return false;
}
} catch(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 certificate_string) {
java.security.cert.Certificate certificate = null;
CertificateFactory cf;
try {
cf = CertificateFactory.getInstance("X.509");
certificate_string = certificate_string.replaceFirst("-----BEGIN CERTIFICATE-----", "").replaceFirst("-----END CERTIFICATE-----", "").trim();
byte[] cert_bytes = Base64.decode(certificate_string, Base64.DEFAULT);
InputStream caInput = new ByteArrayInputStream(cert_bytes);
try {
certificate = cf.generateCertificate(caInput);
System.out.println("ca=" + ((X509Certificate) certificate).getSubjectDN());
} finally {
caInput.close();
}
} catch (CertificateException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
return null;
} catch (IllegalArgumentException e) {
return null;
}
return (X509Certificate) certificate;
}
protected static RSAPrivateKey parseRsaKeyFromString(String RsaKeyString) {
RSAPrivateKey key = null;
try {
KeyFactory kf = KeyFactory.getInstance("RSA", "BC");
RsaKeyString = RsaKeyString.replaceFirst("-----BEGIN RSA PRIVATE KEY-----", "").replaceFirst("-----END RSA PRIVATE KEY-----", "");
PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec( Base64.decode(RsaKeyString, Base64.DEFAULT) );
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 (NoSuchProviderException e) {
// TODO Auto-generated catch block
e.printStackTrace();
return null;
}
return key;
}
/**
* Adds a new X509 certificate given its input stream and its provider name
* @param provider used to store the certificate in the keystore
* @param inputStream from which X509 certificate must be generated.
*/
public static void addTrustedCertificate(String provider, InputStream inputStream) {
CertificateFactory cf;
try {
cf = CertificateFactory.getInstance("X.509");
X509Certificate cert =
(X509Certificate)cf.generateCertificate(inputStream);
keystore_trusted.setCertificateEntry(provider, cert);
} catch (CertificateException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (KeyStoreException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
/**
* Adds a new X509 certificate given in its string from and using its provider name
* @param provider used to store the certificate in the keystore
* @param certificate
*/
public static void addTrustedCertificate(String provider, String certificate) {
try {
X509Certificate cert = ConfigHelper.parseX509CertificateFromString(certificate);
if(keystore_trusted == null) {
keystore_trusted = KeyStore.getInstance("BKS");
keystore_trusted.load(null);
}
keystore_trusted.setCertificateEntry(provider, cert);
} catch (KeyStoreException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (NoSuchAlgorithmException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (CertificateException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
/**
* @return class wide keystore
*/
public static KeyStore getKeystore() {
return keystore_trusted;
}
}
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