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meta: Implement access to AES encryption (but fast)

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PapaTutuWawa
2022-10-04 23:37:32 +02:00
parent 4a89958351
commit 98c3355b44
35 changed files with 858 additions and 0 deletions
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120
packages/moxplatform_android/android/src/main/java/me/polynom/moxplatform_android/MoxplatformAndroidPlugin.java
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@@ -6,15 +6,23 @@ import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.SharedPreferences;
import android.os.Message;
import android.util.Log;
import androidx.annotation.NonNull;
import androidx.core.content.ContextCompat;
import androidx.localbroadcastmanager.content.LocalBroadcastManager;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.util.ArrayList;
import java.util.List;
import javax.crypto.Cipher;
import javax.crypto.CipherOutputStream;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import io.flutter.embedding.engine.plugins.FlutterPlugin;
import io.flutter.embedding.engine.plugins.service.ServiceAware;
import io.flutter.embedding.engine.plugins.service.ServicePluginBinding;
@@ -136,6 +144,38 @@ public class MoxplatformAndroidPlugin extends BroadcastReceiver implements Flutt
}
result.success(true);
break;
case "encryptFile":
Thread encryptionThread = new Thread(new Runnable() {
@Override
public void run() {
ArrayList args = (ArrayList) call.arguments;
String src = (String) args.get(0);
String dest = (String) args.get(1);
byte[] key = (byte[]) args.get(2);
byte[] iv = (byte[]) args.get(3);
int algorithm = (int) args.get(4);
result.success(encryptFile(src, dest, key, iv, algorithm));
}
});
encryptionThread.start();
break;
case "decryptFile":
Thread decryptionThread = new Thread(new Runnable() {
@Override
public void run() {
ArrayList args = (ArrayList) call.arguments;
String src = (String) args.get(0);
String dest = (String) args.get(1);
byte[] key = (byte[]) args.get(2);
byte[] iv = (byte[]) args.get(3);
int algorithm = (int) args.get(4);
result.success(decryptFile(src, dest, key, iv, algorithm));
}
});
decryptionThread.start();
break;
default:
result.notImplemented();
break;
@@ -175,4 +215,84 @@ public class MoxplatformAndroidPlugin extends BroadcastReceiver implements Flutt
Log.d(TAG, "Detached from service");
this.service = null;
}
private String getCipherSpecFromInteger(int algorithm) {
switch (algorithm) {
case 0: return "AES_128/GCM/NoPadding";
case 1: return "AES_256/GCM/NoPadding";
case 2: return "AES_256/CBC/PKCS7PADDING";
default:
Log.d(TAG, "INVALID ALGORITHM");
return "";
}
}
public boolean encryptFile(String src, String dest, byte[] key, byte[] iv, int algorithm) {
String spec = getCipherSpecFromInteger(algorithm);
if (spec.isEmpty()) {
return false;
}
// Shamelessly stolen from https://github.com/hugo-pcl/native-crypto-flutter/pull/3
byte[] buffer = new byte[8096];
SecretKeySpec sk = new SecretKeySpec(key, spec);
try {
Cipher cipher = Cipher.getInstance(spec);
cipher.init(Cipher.ENCRYPT_MODE, sk, new IvParameterSpec(iv));
FileInputStream fin = new FileInputStream(src);
FileOutputStream fout = new FileOutputStream(dest);
CipherOutputStream cout = new CipherOutputStream(fout, cipher);
int len = 0;
while (true) {
len = fin.read(buffer);
if (len != 0 && len > 0) {
cout.write(buffer, 0, len);
} else {
break;
}
}
cout.flush();
cout.close();
fin.close();
return true;
} catch (Exception ex) {
Log.d(TAG, "ENC: " + ex.getMessage());
return false;
}
}
public boolean decryptFile(String src, String dest, byte[] key, byte[] iv, int algorithm) {
String spec = getCipherSpecFromInteger(algorithm);
if (spec.isEmpty()) {
return false;
}
// Shamelessly stolen from https://github.com/hugo-pcl/native-crypto-flutter/pull/3
byte[] buffer = new byte[8096];
SecretKeySpec sk = new SecretKeySpec(key, spec);
try {
Cipher cipher = Cipher.getInstance(spec);
cipher.init(Cipher.DECRYPT_MODE, sk, new IvParameterSpec(iv));
FileInputStream fin = new FileInputStream(src);
FileOutputStream fout = new FileOutputStream(dest);
CipherOutputStream cout = new CipherOutputStream(fout, cipher);
Log.d(TAG, "Reading from " + src + ", writing to " + dest);
int len = 0;
while (true) {
len = fin.read(buffer);
if (len != 0 && len > 0) {
cout.write(buffer, 0, len);
} else {
break;
}
}
cout.flush();
cout.close();
fin.close();
return true;
} catch (Exception ex) {
Log.d(TAG, "DEC: " + ex.getMessage());
return false;
}
}
}