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Code Issues Releases Wiki Activity

Cloud sync: Gzip

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M66B 2023-01-17 21:29:15 +01:00
parent 52f864176f
commit ec407fb1d6
1 changed files with 25 additions and 3 deletions
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28
app/src/main/java/eu/faircode/email/CloudSync.java
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@ -33,6 +33,8 @@ import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.net.URL;
import java.nio.ByteBuffer;
@ -49,6 +51,8 @@ import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
@ -723,7 +727,8 @@ public class CloudSync {
return ad;
}
private static String transform(String value, byte[] key, byte[] ad, boolean encrypt) throws GeneralSecurityException {
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]);
@ -731,12 +736,29 @@ public class CloudSync {
if (ad != null)
cipher.updateAAD(ad);
if (encrypt) {
byte[] encrypted = cipher.doFinal(value.getBytes());
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(decrypted);
return new String(decompress(decrypted));
}
}
public static byte[] compress(byte[] data) throws IOException {
try (ByteArrayOutputStream bos = new ByteArrayOutputStream(data.length)) {
try (GZIPOutputStream gzip = new GZIPOutputStream(bos)) {
gzip.write(data);
}
return bos.toByteArray();
}
}
public static byte[] decompress(byte[] compressed) throws IOException {
try (ByteArrayInputStream is = new ByteArrayInputStream(compressed)) {
try (GZIPInputStream gis = new GZIPInputStream(is)) {
return Helper.readBytes(gis);
}
}
}