Add opt-in hash based module.zip verification system.

app/src/main/java/com/fox2code/mmm/ActionButtonType.java

@@ -47,8 +47,9 @@ public enum ActionButtonType {
             if (moduleInfo == null) return;
             String updateZipUrl = moduleHolder.getUpdateZipUrl();
             if (updateZipUrl == null) return;
+            String updateZipChecksum = moduleHolder.getUpdateZipChecksum();
             IntentHelper.openInstaller(button.getContext(), updateZipUrl,
-                    moduleInfo.name, moduleInfo.config);
+                    moduleInfo.name, moduleInfo.config, updateZipChecksum);
         }
     },
     UNINSTALL() {

app/src/main/java/com/fox2code/mmm/Constants.java

@@ -13,6 +13,7 @@ public class Constants {
     public static final String EXTRA_INSTALL_PATH = "extra_install_path";
     public static final String EXTRA_INSTALL_NAME = "extra_install_name";
     public static final String EXTRA_INSTALL_CONFIG = "extra_install_config";
+    public static final String EXTRA_INSTALL_CHECKSUM = "extra_install_checksum";
     public static final String EXTRA_INSTALL_NO_PATCH = "extra_install_no_patch";
     public static final String EXTRA_INSTALL_NO_EXTENSIONS = "extra_install_no_extensions";
     public static final String EXTRA_INSTALL_TEST_ROOTLESS = "extra_install_test_rootless";

app/src/main/java/com/fox2code/mmm/ModuleHolder.java

@@ -69,10 +69,18 @@ public final class ModuleHolder implements Comparable<ModuleHolder> {
 
     public String getUpdateZipUrl() {
         return this.moduleInfo == null || (this.repoModule != null &&
-                this.moduleInfo.updateVersionCode < this.repoModule.lastUpdated) ?
+                this.moduleInfo.updateVersionCode <
+                        this.repoModule.moduleInfo.versionCode) ?
                 this.repoModule.zipUrl : this.moduleInfo.updateZipUrl;
     }
 
+    public String getUpdateZipChecksum() {
+        return this.moduleInfo == null || (this.repoModule != null &&
+                this.moduleInfo.updateVersionCode <
+                        this.repoModule.moduleInfo.versionCode) ?
+                this.repoModule.checksum : this.moduleInfo.updateChecksum;
+    }
+
     public String getMainModuleName() {
         ModuleInfo moduleInfo = this.getMainModuleInfo();
         if (moduleInfo == null || moduleInfo.name == null)

app/src/main/java/com/fox2code/mmm/NotificationType.java

@@ -89,7 +89,7 @@ public enum NotificationType implements NotificationTypeCst {
                     } else {
                         IntentHelper.openInstaller(compatActivity, d.getAbsolutePath(),
                                 compatActivity.getString(
-                                        R.string.local_install_title), null, false,
+                                        R.string.local_install_title), null, null, false,
                                 BuildConfig.DEBUG && // Use debug mode if no root
                                         InstallerInitializer.peekMagiskPath() == null);
                     }
@@ -102,7 +102,7 @@ public enum NotificationType implements NotificationTypeCst {
             } else if (s == IntentHelper.RESPONSE_URL) {
                 IntentHelper.openInstaller(compatActivity, u.toString(),
                         compatActivity.getString(
-                                R.string.remote_install_title), null, false,
+                                R.string.remote_install_title), null, null, false,
                         BuildConfig.DEBUG && // Use debug mode if no root
                                 InstallerInitializer.peekMagiskPath() == null);
             }

app/src/main/java/com/fox2code/mmm/androidacy/AndroidacyWebAPI.java

@@ -79,7 +79,8 @@ public class AndroidacyWebAPI {
                 moduleUrl + " " + installTitle + " " + checksum);
         Uri uri = Uri.parse(moduleUrl);
         if (uri.getScheme().equals("https") && uri.getHost().endsWith(".androidacy.com")) {
-            IntentHelper.openInstaller(this.activity, moduleUrl, installTitle, null);
+            IntentHelper.openInstaller(this.activity,
+                    moduleUrl, installTitle, null, checksum);
         } else {
             this.activity.forceBackPressed();
         }

app/src/main/java/com/fox2code/mmm/installer/InstallerActivity.java

@@ -22,6 +22,7 @@ import com.fox2code.mmm.R;
 import com.fox2code.mmm.compat.CompatActivity;
 import com.fox2code.mmm.utils.FastException;
 import com.fox2code.mmm.utils.Files;
+import com.fox2code.mmm.utils.Hashes;
 import com.fox2code.mmm.utils.Http;
 import com.fox2code.mmm.utils.IntentHelper;
 import com.google.android.material.progressindicator.LinearProgressIndicator;
@@ -54,6 +55,7 @@ public class InstallerActivity extends CompatActivity {
         final Intent intent = this.getIntent();
         final String target;
         final String name;
+        final String checksum;
         final boolean noPatch;
         final boolean noExtensions;
         final boolean rootless;
@@ -66,6 +68,7 @@ public class InstallerActivity extends CompatActivity {
             }
             target = intent.getStringExtra(Constants.EXTRA_INSTALL_PATH);
             name = intent.getStringExtra(Constants.EXTRA_INSTALL_NAME);
+            checksum = intent.getStringExtra(Constants.EXTRA_INSTALL_CHECKSUM);
             noPatch = intent.getBooleanExtra(Constants.EXTRA_INSTALL_NO_PATCH, false);
             noExtensions = intent.getBooleanExtra(// Allow intent to disable extensions
                     Constants.EXTRA_INSTALL_NO_EXTENSIONS, false);
@@ -122,6 +125,15 @@ public class InstallerActivity extends CompatActivity {
                             this.progressIndicator.setProgressCompat(progress, true);
                         });
                     });
+                    if (checksum != null && !checksum.isEmpty()) {
+                        Log.d(TAG, "Checking for checksum: " + checksum);
+                        this.installerTerminal.addLine("- Checking file integrity");
+                        if (!Hashes.checkSumMatch(rawModule, checksum)) {
+                            this.setInstallStateFinished(false,
+                                    "! File integrity check failed", "");
+                            return;
+                        }
+                    }
                     if (noPatch) {
                         try (OutputStream outputStream = new FileOutputStream(moduleCache)) {
                             outputStream.write(rawModule);
@@ -152,13 +164,31 @@ public class InstallerActivity extends CompatActivity {
                 }
             }, "Module download Thread").start();
         } else {
+            final File moduleFile = new File(target);
+            if (checksum != null && !checksum.isEmpty()) {
+                Log.d(TAG, "Checking for checksum: " + checksum);
+                this.installerTerminal.addLine("- Checking file integrity");
+                try {
+                    if (!Hashes.checkSumMatch(Files.readSU(moduleFile), checksum)) {
+                        this.setInstallStateFinished(false,
+                                "! File integrity check failed", "");
+                        return;
+                    }
+                } catch (IOException e) {
+                    Log.e(TAG, "Failed to read file for checksum check", e);
+                    this.setInstallStateFinished(false,
+                            "! File integrity check failed", "");
+                    return;
+                }
+            }
             this.installerTerminal.addLine("- Installing " + name);
             new Thread(() -> this.doInstall(
-                    this.toDelete = new File(target), noExtensions, rootless),
+                    this.toDelete = moduleFile, noExtensions, rootless),
                     "Install Thread").start();
         }
     }
 
+
     private void doInstall(File file,boolean noExtensions,boolean rootless) {
         Log.i(TAG, "Installing: " + moduleCache.getName());
         InstallerController installerController = new InstallerController(

app/src/main/java/com/fox2code/mmm/manager/LocalModuleInfo.java

@@ -15,6 +15,7 @@ public class LocalModuleInfo extends ModuleInfo {
     public long updateVersionCode = Long.MIN_VALUE;
     public String updateZipUrl;
     public String updateChangeLog;
+    public String updateChecksum;
 
     public LocalModuleInfo(String id) {
         super(id);
@@ -29,6 +30,7 @@ public class LocalModuleInfo extends ModuleInfo {
                 this.updateVersionCode = jsonUpdate.getLong("versionCode");
                 this.updateZipUrl = jsonUpdate.getString("zipUrl");
                 this.updateChangeLog = jsonUpdate.optString("changelog");
+                this.updateChecksum = jsonUpdate.optString("checksum");
                 if (this.updateZipUrl.isEmpty()) throw FastException.INSTANCE;
                 this.updateVersion = PropUtils.shortenVersionName(
                         this.updateVersion.trim(), this.updateVersionCode);
@@ -37,6 +39,7 @@ public class LocalModuleInfo extends ModuleInfo {
                 this.updateVersionCode = Long.MIN_VALUE;
                 this.updateZipUrl = null;
                 this.updateChangeLog = null;
+                this.updateChecksum = null;
                 Log.w("LocalModuleInfo",
                         "Failed update checking for module: " + this.id, e);
             }

app/src/main/java/com/fox2code/mmm/repo/RepoData.java

@@ -118,6 +118,7 @@ public class RepoData {
                 String moduleNotesUrl = module.getString("notes_url");
                 String modulePropsUrl = module.getString("prop_url");
                 String moduleZipUrl = module.getString("zip_url");
+                String moduleChecksum = module.optString("checksum");
                 if (moduleLastUpdateSpecial != null) { // Fix last update time
                     Log.d("RepoData", "Data: " + moduleLastUpdate + " -> " +
                             moduleLastUpdateSpecial + " for " + moduleId);
@@ -147,6 +148,7 @@ public class RepoData {
                 repoModule.notesUrl = moduleNotesUrl;
                 repoModule.propUrl = modulePropsUrl;
                 repoModule.zipUrl = moduleZipUrl;
+                repoModule.checksum = moduleChecksum;
             }
             // Remove no longer existing modules
             Iterator<RepoModule> moduleInfoIterator = this.moduleHashMap.values().iterator();

app/src/main/java/com/fox2code/mmm/repo/RepoManager.java

@@ -12,6 +12,7 @@ import com.fox2code.mmm.utils.Http;
 import com.fox2code.mmm.utils.PropUtils;
 
 import java.io.File;
+import java.nio.charset.StandardCharsets;
 import java.util.HashMap;
 import java.util.LinkedHashMap;
 import java.util.List;
@@ -230,7 +231,8 @@ public final class RepoManager {
             case MAGISK_ALT_REPO_JSDELIVR:
                 return "magisk_alt_repo";
             default:
-                return "repo_" + Hashes.hashSha1(url);
+                return "repo_" + Hashes.hashSha1(
+                        url.getBytes(StandardCharsets.UTF_8));
         }
     }
 

app/src/main/java/com/fox2code/mmm/repo/RepoModule.java

@@ -10,6 +10,7 @@ public class RepoModule {
     public String propUrl;
     public String zipUrl;
     public String notesUrl;
+    public String checksum;
     boolean processed;
 
     public RepoModule(String id) {

app/src/main/java/com/fox2code/mmm/utils/Hashes.java

@@ -1,10 +1,13 @@
 package com.fox2code.mmm.utils;
 
-import java.nio.charset.StandardCharsets;
+import android.util.Log;
+
 import java.security.MessageDigest;
 import java.security.NoSuchAlgorithmException;
+import java.util.Locale;
 
 public class Hashes {
+    private static final String TAG = "Hashes";
     private static final char[] HEX_ARRAY = "0123456789abcdef".toCharArray();
     public static String bytesToHex(byte[] bytes) {
         char[] hexChars = new char[bytes.length * 2];
@@ -16,13 +19,69 @@ public class Hashes {
         return new String(hexChars);
     }
 
-    public static String hashSha1(String input) {
+    public static String hashMd5(byte[] input) {
+        try {
+            MessageDigest md = MessageDigest.getInstance("MD5");
+
+            return bytesToHex(md.digest(input));
+        } catch (NoSuchAlgorithmException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    public static String hashSha1(byte[] input) {
         try {
             MessageDigest md = MessageDigest.getInstance("SHA-1");
 
-            return bytesToHex(md.digest(input.getBytes(StandardCharsets.UTF_8)));
+            return bytesToHex(md.digest(input));
         } catch (NoSuchAlgorithmException e) {
             throw new RuntimeException(e);
         }
     }
+
+    public static String hashSha256(byte[] input) {
+        try {
+            MessageDigest md = MessageDigest.getInstance("SHA-256");
+
+            return bytesToHex(md.digest(input));
+        } catch (NoSuchAlgorithmException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    public static String hashSha512(byte[] input) {
+        try {
+            MessageDigest md = MessageDigest.getInstance("SHA-512");
+
+            return bytesToHex(md.digest(input));
+        } catch (NoSuchAlgorithmException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    /**
+     * Check if the checksum match a file by picking the correct
+     * hashing algorithm depending on the length of the checksum
+     */
+    public static boolean checkSumMatch(byte[] data, String checksum) {
+        String hash;
+        switch (checksum.length()) {
+            case 0:
+                return true; // No checksum
+            case 32:
+                hash = Hashes.hashMd5(data); break;
+            case 40:
+                hash = Hashes.hashSha1(data); break;
+            case 64:
+                hash = Hashes.hashSha256(data); break;
+            case 128:
+                hash = Hashes.hashSha512(data); break;
+            default:
+                Log.e(TAG, "No hash algorithm for " +
+                        checksum.length() * 8 + "bit checksums");
+                return false;
+        }
+        Log.d(TAG, "Checksum result (data: " + hash+ ",expected: " + checksum);
+        return hash.equals(checksum.toLowerCase(Locale.ROOT));
+    }
 }

app/src/main/java/com/fox2code/mmm/utils/IntentHelper.java

@@ -104,12 +104,13 @@ public class IntentHelper {
         }
     }
 
-    public static void openInstaller(Context context, String url, String title, String config) {
+    public static void openInstaller(Context context, String url, String title,
-        openInstaller(context, url, title, config, false, false);
+                                     String config, String checksum) {
+        openInstaller(context, url, title, config, checksum, false, false);
     }
 
     public static void openInstaller(Context context, String url, String title, String config,
-                                       boolean noPatch,boolean testDebug) {
+                                       String checksum, boolean noPatch,boolean testDebug) {
         try {
             Intent intent = new Intent(context, InstallerActivity.class);
             intent.setAction(Constants.INTENT_INSTALL_INTERNAL);
@@ -118,6 +119,8 @@ public class IntentHelper {
             intent.putExtra(Constants.EXTRA_INSTALL_NAME, title);
             if (config != null && !config.isEmpty())
                 intent.putExtra(Constants.EXTRA_INSTALL_CONFIG, config);
+            if (checksum != null && !checksum.isEmpty())
+                intent.putExtra(Constants.EXTRA_INSTALL_CHECKSUM, checksum);
             if (noPatch)
                 intent.putExtra(Constants.EXTRA_INSTALL_NO_PATCH, true);
             if (testDebug && BuildConfig.DEBUG)