### Install Required Packages on Debian/Ubuntu Linux

Source: https://github.com/chiteroman/frameworkpatch/blob/main/README.md

This snippet provides commands to update the system and install necessary packages like default-jdk and zipalign on Debian-based Linux distributions (e.g., Ubuntu) for the Framework Patch project. These packages are essential for Java development and Android application alignment.

```Shell
sudo apt update
sudo apt full-upgrade -y
sudo apt install -y default-jdk zipalign
```

--------------------------------

### Compile Smali and Baksmali from Source

Source: https://github.com/chiteroman/frameworkpatch/blob/main/README.md

These commands clone the Smali project from GitHub, navigate into its directory, and then use Gradle to build the project. This process generates the `smali.jar` and `baksmali.jar` fat JARs, which are essential tools for decompiling and recompiling Android DEX files.

```bash
git clone --depth=1 https://github.com/google/smali.git
cd smali
./gradlew build
```

--------------------------------

### Zipalign Framework ZIP to JAR

Source: https://github.com/chiteroman/frameworkpatch/blob/main/README.md

This command uses `zipalign` to optimize the `framework.zip` file, which contains the recompiled DEX files, and convert it into the final `framework.jar`. The `-f` flag forces output overwrite, `-p` ensures page alignment, `-v` provides verbose output, and `-z 4` specifies 4-byte alignment for optimal performance.

```bash
zipalign -f -p -v -z 4 framework.zip framework.jar
```

--------------------------------

### Smali Code to Add for Instrumentation.newApplication Hook

Source: https://github.com/chiteroman/frameworkpatch/blob/main/README.md

This Smali code snippet is to be added before the return operation in the `newApplication` methods of `Instrumentation.smali`. It invokes a static method `onNewApp` from a custom `Android` utility class, passing the `Context` register, allowing for custom logic execution when a new application is created.

```smali
invoke-static {XX}, Lcom/android/internal/util/framework/Android;->onNewApp(Landroid/content/Context;)V
```

--------------------------------

### Compile Smali Files to DEX using Smali Compiler

Source: https://github.com/chiteroman/frameworkpatch/blob/main/README.md

These commands use `smali.jar` to compile the modified Smali code back into DEX files. The `-a` flag specifies the Android API level, and `-o` specifies the output path for the compiled `classesX.dex` files, which will replace the original ones in the `framework/` directory.

```bash
java -jar smali.jar a -a (ANDROID API LEVEL) classes -o framework/classes.dex
java -jar smali.jar a -a (ANDROID API LEVEL) classes2 -o framework/classes2.dex
java -jar smali.jar a -a (ANDROID API LEVEL) classes3 -o framework/classes3.dex
...
```

--------------------------------

### Decompile Android DEX Files with Baksmali

Source: https://github.com/chiteroman/frameworkpatch/blob/main/README.md

These commands use `baksmali.jar` to decompile all `classesX.dex` files found within the extracted `framework/` directory. The `-a` flag specifies the Android API level, and `-o` specifies the output directory where the decompiled Smali code will be stored.

```bash
java -jar baksmali.jar d -a (ANDROID API LEVEL) framework/classes.dex -o classes
java -jar baksmali.jar d -a (ANDROID API LEVEL) framework/classes2.dex -o classes2
java -jar baksmali.jar d -a (ANDROID API LEVEL) framework/classes3.dex -o classes3
...
```

--------------------------------

### Original Smali Code for AndroidKeyStoreSpi.engineGetCertificateChain

Source: https://github.com/chiteroman/frameworkpatch/blob/main/README.md

This snippet shows the original Smali code found within the `engineGetCertificateChain` method of `AndroidKeyStoreSpi.smali`. It demonstrates the typical structure before modification, specifically the `aput-object` instruction which places the leaf certificate into the chain.

```smali
const/4 v4, 0x0
aput-object v2, v3, v4
return-object v3
```

--------------------------------

### Final Smali Code for AndroidKeyStoreSpi.engineGetCertificateChain

Source: https://github.com/chiteroman/frameworkpatch/blob/main/README.md

This is the complete modified Smali code for the `engineGetCertificateChain` method in `AndroidKeyStoreSpi.smali`. It includes the original `aput-object` instruction followed by the added `invoke-static` call to a custom hook, ensuring the certificate chain is processed by the custom logic before being returned.

```smali
const/4 v4, 0x0
aput-object v2, v3, v4
invoke-static {v3}, Lcom/android/internal/util/framework/Android;->engineGetCertificateChain([Ljava/security/cert/Certificate;)[Ljava/security/cert/Certificate;
move-result-object v3
return-object v3
```

--------------------------------

### Original Smali Code for ApplicationPackageManager.hasSystemFeature

Source: https://github.com/chiteroman/frameworkpatch/blob/main/README.md

This snippet shows the original Smali code for the `hasSystemFeature` method in `ApplicationPackageManager.smali`. It demonstrates the method's signature, parameters, and the internal call to an overloaded `hasSystemFeature` method, returning its boolean result.

```smali
.method public whitelist hasSystemFeature(Ljava/lang/String;)Z
    .registers 3
    .param p1, "name"    # Ljava/lang/String;

    .line 768
    const/4 v0, 0x0

    invoke-virtual {p0, p1, v0}, Landroid/app/ApplicationPackageManager;->hasSystemFeature(Ljava/lang/String;I)Z

    move-result v0

    return v0
.end method
```

--------------------------------

### Pull Android Framework.jar from Device

Source: https://github.com/chiteroman/frameworkpatch/blob/main/README.md

This command uses ADB (Android Debug Bridge) to pull the `framework.jar` file from the `/system/framework` directory of a connected Android device to the current working directory on the host machine, which is the initial step for modification.

```bash
adb pull /system/framework/framework.jar
```

--------------------------------

### Smali Code to Add for AndroidKeyStoreSpi.engineGetCertificateChain Hook

Source: https://github.com/chiteroman/frameworkpatch/blob/main/README.md

This Smali code snippet is to be inserted after the `aput-object` operation in the `engineGetCertificateChain` method. It invokes a static method `engineGetCertificateChain` from a custom `Android` utility class, passing the certificate chain and receiving the modified chain back, effectively hooking the certificate chain processing.

```smali
invoke-static {XX}, Lcom/android/internal/util/framework/Android;->engineGetCertificateChain([Ljava/security/cert/Certificate;)[Ljava/security/cert/Certificate;
move-result-object XX
```

--------------------------------

### Identify DEX File for Android Classes

Source: https://github.com/chiteroman/frameworkpatch/blob/main/README.md

This snippet illustrates how to identify which DEX file (e.g., `classes.dex`, `classes3.dex`) a specific Android class belongs to. This is determined by examining the `/* loaded from: */` comment found in the decompiled Java source code of the class, which is crucial for targeted decompilation.

```java
/* loaded from: classes3.dex */
public class AndroidKeyStoreSpi extends KeyStoreSpi

/* loaded from: classes.dex */
public class Instrumentation
```

--------------------------------

### Modified Smali Code for ApplicationPackageManager.hasSystemFeature

Source: https://github.com/chiteroman/frameworkpatch/blob/main/README.md

This is the modified Smali code for the `hasSystemFeature` method in `ApplicationPackageManager.smali`. After the original `invoke-virtual` call, it adds an `invoke-static` call to a custom `Android` utility method, passing the original result and the feature name. The result of this custom method then becomes the final return value, allowing for feature spoofing or modification.

```smali
.method public whitelist hasSystemFeature(Ljava/lang/String;)Z
    .registers 3
    .param p1, "name"    # Ljava/lang/String;

    .line 768
    const/4 v0, 0x0

    invoke-virtual {p0, p1, v0}, Landroid/app/ApplicationPackageManager;->hasSystemFeature(Ljava/lang/String;I)Z

    move-result v0

    invoke-static {v0, p1}, Lcom/android/internal/util/framework/Android;->hasSystemFeature(ZLjava/lang/String;)Z

    move-result v0

    return v0
.end method
```

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