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Code Issues Releases Wiki Activity

Cloud sync: native BouncyCastle

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This commit is contained in:
M66B 2023-01-21 12:39:51 +01:00
parent 6087ae32f5
commit 038cd2514f
1 changed files with 29 additions and 23 deletions
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52
app/src/main/java/eu/faircode/email/CloudSync.java
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@ -27,6 +27,11 @@ import android.util.Pair;
import androidx.preference.PreferenceManager;
import org.bouncycastle.crypto.InvalidCipherTextException;
import org.bouncycastle.crypto.engines.AESEngine;
import org.bouncycastle.crypto.modes.GCMSIVBlockCipher;
import org.bouncycastle.crypto.params.AEADParameters;
import org.bouncycastle.crypto.params.KeyParameter;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
@ -53,12 +58,9 @@ import java.util.Map;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.SecretKeySpec;
import javax.net.ssl.HttpsURLConnection;
public class CloudSync {
@ -70,7 +72,7 @@ public class CloudSync {
// Upper level
static void execute(Context context, String command, boolean manual)
throws JSONException, GeneralSecurityException, IOException {
throws JSONException, GeneralSecurityException, IOException, InvalidCipherTextException {
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
String user = prefs.getString("cloud_user", null);
String password = prefs.getString("cloud_password", null);
@ -220,7 +222,7 @@ public class CloudSync {
}
private static void sendLocalData(Context context, String user, String password, long lrevision)
throws JSONException, GeneralSecurityException, IOException {
throws JSONException, GeneralSecurityException, IOException, InvalidCipherTextException {
DB db = DB.getInstance(context);
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
boolean cloud_send = prefs.getBoolean("cloud_send", true);
@ -309,7 +311,7 @@ public class CloudSync {
}
private static void receiveRemoteData(Context context, String user, String password, long lrevision, long rrevision, JSONObject jstatus)
throws JSONException, GeneralSecurityException, IOException {
throws JSONException, GeneralSecurityException, IOException, InvalidCipherTextException {
DB db = DB.getInstance(context);
File dir = Helper.ensureExists(new File(context.getFilesDir(), "syncdata"));
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
@ -534,7 +536,7 @@ public class CloudSync {
// Lower level
public static JSONObject call(Context context, String user, String password, String command, JSONObject jrequest)
throws GeneralSecurityException, JSONException, IOException {
throws GeneralSecurityException, JSONException, IOException, InvalidCipherTextException {
EntityLog.log(context, EntityLog.Type.Cloud, "Cloud command=" + command);
jrequest.put("command", command);
@ -559,7 +561,7 @@ public class CloudSync {
}
private static JSONObject _call(Context context, String user, String password, JSONObject jrequest)
throws GeneralSecurityException, JSONException, IOException {
throws GeneralSecurityException, JSONException, IOException, InvalidCipherTextException {
byte[] salt = MessageDigest.getInstance("SHA256").digest(user.getBytes());
byte[] huser = MessageDigest.getInstance("SHA256").digest(salt);
byte[] userid = Arrays.copyOfRange(huser, 0, 8);
@ -710,21 +712,25 @@ public class CloudSync {
}
private static String transform(String value, byte[] key, byte[] ad, boolean encrypt)
throws GeneralSecurityException, IOException {
SecretKeySpec secret = new SecretKeySpec(key, "AES");
Cipher cipher = Cipher.getInstance("AES/GCM-SIV/NoPadding");
IvParameterSpec ivSpec = new IvParameterSpec(new byte[12]);
cipher.init(encrypt ? Cipher.ENCRYPT_MODE : Cipher.DECRYPT_MODE, secret, ivSpec);
if (ad != null)
cipher.updateAAD(ad);
if (encrypt) {
byte[] encrypted = cipher.doFinal(compress(value.getBytes()));
return Base64.encodeToString(encrypted, Base64.NO_PADDING | Base64.NO_WRAP);
} else {
byte[] encrypted = Base64.decode(value, Base64.NO_PADDING | Base64.NO_WRAP);
byte[] decrypted = cipher.doFinal(encrypted);
return new String(decompress(decrypted));
}
throws InvalidCipherTextException, IOException {
byte[] iv = new byte[12];
GCMSIVBlockCipher cipher = new GCMSIVBlockCipher(new AESEngine());
AEADParameters aead = new AEADParameters(new KeyParameter(key), 128, iv, ad);
cipher.init(encrypt, aead);
byte[] input = (encrypt
? compress(value.getBytes())
: Base64.decode(value, Base64.NO_PADDING | Base64.NO_WRAP));
int outputLength = cipher.getOutputSize(input.length);
byte[] output = new byte[outputLength];
int outputOffset = cipher.processBytes(input, 0, input.length, output, 0);
outputOffset += cipher.doFinal(output, outputOffset); // tag
if (outputOffset != outputLength)
throw new IllegalStateException("offset=" + outputOffset + "/" + outputLength);
return (encrypt
? Base64.encodeToString(output, Base64.NO_PADDING | Base64.NO_WRAP)
: new String(decompress(output)));
}
public static byte[] compress(byte[] data) throws IOException {