【Android 安全】DEX 加密 ( 代理 Application 开发 | 加载 dex 文件 | 使用反射获取方法创建本应用的 dexElements | 各版本创建 dex 数组源码对比 )

韩曙亮

发布于 2023-03-28 19:03:14

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文章被收录于专栏：韩曙亮的移动开发专栏韩曙亮的移动开发专栏

文章目录

一、不同 Android 系统创建 dex 数组源码对比

\rm Android \ 4.4 \ ( KitKat \ API \ 19 )

系统中创建 Element[] dexElements 的方法 :

/*package*/ final class DexPathList {
    private Element[] dexElements;
    public DexPathList(ClassLoader definingContext, String dexPath,
            String libraryPath, File optimizedDirectory) {
        this.dexElements = makeDexElements(splitDexPath(dexPath), optimizedDirectory,
                                           suppressedExceptions);
	}

    /**
     * 创建一个数组 ,  每个数组元素都是 dex 路径名称 .
     */
    private static Element[] makeDexElements(ArrayList<File> files, File optimizedDirectory,
                                             ArrayList<IOException> suppressedExceptions) {
	}
}

参考 : 4.4.4_r1/xref/libcore/dalvik/src/main/java/dalvik/system/DexPathList.java

\rm Android \ 4.4W \ ( KitKat Watch \ API \ 20 )

系统中创建 Element[] dexElements 的方法 :

/*package*/ final class DexPathList {
    private Element[] dexElements;
    public DexPathList(ClassLoader definingContext, String dexPath,
            String libraryPath, File optimizedDirectory) {
        this.dexElements = makeDexElements(splitDexPath(dexPath), optimizedDirectory,
                                           suppressedExceptions);
	}

    /**
     * 创建一个数组 ,  每个数组元素都是 dex 路径名称 .
     */
    private static Element[] makeDexElements(ArrayList<File> files, File optimizedDirectory,
                                             ArrayList<IOException> suppressedExceptions){
	}
}

参考 : 4.4w_r1/xref/libcore/dalvik/src/main/java/dalvik/system/DexPathList.java

\rm Android \ 5.0 \ ( Lollipop \ API \ 21 )

系统中创建 Element[] dexElements 的方法 :

/*package*/ final class DexPathList {
    private Element[] dexElements;
    public DexPathList(ClassLoader definingContext, String dexPath,
            String libraryPath, File optimizedDirectory) {
        this.dexElements = makeDexElements(splitDexPath(dexPath), optimizedDirectory,
                                           suppressedExceptions);
	}

    /**
     * 创建一个数组 ,  每个数组元素都是 dex 路径名称 .
     */
    private static Element[] makeDexElements(ArrayList<File> files, File optimizedDirectory,
                                             ArrayList<IOException> suppressedExceptions){
	}
}

参考 : 5.0.1_r1/xref/libcore/dalvik/src/main/java/dalvik/system/DexPathList.java

\rm Android \ 5.1 \ ( Lollipop \ API \ 22 )

系统中创建 Element[] dexElements 的方法 :

/*package*/ final class DexPathList {
    private Element[] dexElements;
    public DexPathList(ClassLoader definingContext, String dexPath,
            String libraryPath, File optimizedDirectory) {
        this.dexElements = makeDexElements(splitDexPath(dexPath), optimizedDirectory,
                                           suppressedExceptions);
	}

    /**
     * 创建一个数组 ,  每个数组元素都是 dex 路径名称 .
     */
    private static Element[] makeDexElements(ArrayList<File> files, File optimizedDirectory,
                                             ArrayList<IOException> suppressedExceptions){
	}
}

参考 : 5.1.0_r3/xref/libcore/dalvik/src/main/java/dalvik/system/DexPathList.java

\rm Android \ 6.0 \ (Marshmallow \ API \ 23 )

系统中创建 Element[] dexElements 的方法 :

/*package*/ final class DexPathList {
    private Element[] dexElements;
    public DexPathList(ClassLoader definingContext, String dexPath,
            String libraryPath, File optimizedDirectory) {
        // save dexPath for BaseDexClassLoader
        this.dexElements = makePathElements(splitDexPath(dexPath), optimizedDirectory,
                                            suppressedExceptions);
	}

    /**
     * 创建一个数组 ,  每个数组元素都是 dex 路径名称 .
     */
    private static Element[] makePathElements(List<File> files, File optimizedDirectory,
                                              List<IOException> suppressedExceptions) {
	}
}

参考 : 6.0.1_r16/xref/libcore/dalvik/src/main/java/dalvik/system/DexPathList.java

\rm Android \ 7.0 \ ( Nougat \ API \ 24 )

系统中创建 Element[] dexElements 的方法 :

/*package*/ final class DexPathList {
    private Element[] dexElements;
    public DexPathList(ClassLoader definingContext, String dexPath,
            String librarySearchPath, File optimizedDirectory) {
        // save dexPath for BaseDexClassLoader
        this.dexElements = makeDexElements(splitDexPath(dexPath), optimizedDirectory,
                                           suppressedExceptions, definingContext);
	}
    private static Element[] makeDexElements(List<File> files, File optimizedDirectory,
                                             List<IOException> suppressedExceptions,
                                             ClassLoader loader) {
 	}
    /**
     * Makes an array of directory/zip path elements, one per element of the given array.
     */
    private static Element[] makePathElements(List<File> files,
                                              List<IOException> suppressedExceptions,
                                              ClassLoader loader) {
        return makeElements(files, null, suppressedExceptions, true, loader);
    }

    /*
     * TODO (dimitry): Revert after apps stops relying on the existence of this
     * method (see http://b/21957414 and http://b/26317852 for details)
     */
    private static Element[] makePathElements(List<File> files, File optimizedDirectory,
                                              List<IOException> suppressedExceptions) {
        return makeElements(files, optimizedDirectory, suppressedExceptions, false, null);
    }
}

参考 : 7.0.0_r31/xref/libcore/dalvik/src/main/java/dalvik/system/DexPathList.java

\rm Android \ 7.1 \ ( Nougat \ API \ 25 )

系统中创建 Element[] dexElements 的方法 :

/*package*/ final class DexPathList {
    private Element[] dexElements;
    public DexPathList(ClassLoader definingContext, String dexPath,
            String librarySearchPath, File optimizedDirectory) {
        // save dexPath for BaseDexClassLoader
        this.dexElements = makeDexElements(splitDexPath(dexPath), optimizedDirectory,
                                           suppressedExceptions, definingContext);
	}
    private static Element[] makeDexElements(List<File> files, File optimizedDirectory,
                                             List<IOException> suppressedExceptions,
                                             ClassLoader loader) {
 	}
    /**
     * Makes an array of directory/zip path elements, one per element of the given array.
     */
    private static Element[] makePathElements(List<File> files,
                                              List<IOException> suppressedExceptions,
                                              ClassLoader loader) {
        return makeElements(files, null, suppressedExceptions, true, loader);
    }

    /*
     * TODO (dimitry): Revert after apps stops relying on the existence of this
     * method (see http://b/21957414 and http://b/26317852 for details)
     */
    private static Element[] makePathElements(List<File> files, File optimizedDirectory,
                                              List<IOException> suppressedExceptions) {
        return makeElements(files, optimizedDirectory, suppressedExceptions, false, null);
    }
}

参考 : 7.1.1_r28/xref/libcore/dalvik/src/main/java/dalvik/system/DexPathList.java

\rm Android \ 8.0 \ ( Oreo \ API \ 25 )

系统中创建 Element[] dexElements 的方法 :

/*package*/ final class DexPathList {
    private Element[] dexElements;
    public DexPathList(ClassLoader definingContext, String dexPath,
            String librarySearchPath, File optimizedDirectory) {
        // save dexPath for BaseDexClassLoader
        this.dexElements = makeDexElements(splitDexPath(dexPath), optimizedDirectory,
                                           suppressedExceptions, definingContext);
	}
	
    private static Element[] makeDexElements(List<File> files, File optimizedDirectory,
                                             List<IOException> suppressedExceptions,
                                             ClassLoader loader) {
 	}

    /*
     * TODO (dimitry): Revert after apps stops relying on the existence of this
     * method (see http://b/21957414 and http://b/26317852 for details)
     */
    @SuppressWarnings("unused")
    private static Element[] makePathElements(List<File> files, File optimizedDirectory,
            List<IOException> suppressedExceptions) {
        return makeDexElements(files, optimizedDirectory, suppressedExceptions, null);
    }

    /**
     * Makes an array of directory/zip path elements for the native library search path, one per
     * element of the given array.
     */
    private static NativeLibraryElement[] makePathElements(List<File> files) {
    }
}

参考 : 8.0.0_r4/xref/libcore/dalvik/src/main/java/dalvik/system/DexPathList.java

\rm Android \ 9.0 \ ( Pie \ API \ 28 )

系统中创建 Element[] dexElements 的方法 :

/*package*/ final class DexPathList {
    private Element[] dexElements;
    public DexPathList(ClassLoader definingContext, String dexPath,
            String librarySearchPath, File optimizedDirectory) {
        // save dexPath for BaseDexClassLoader
        this.dexElements = makeDexElements(splitDexPath(dexPath), optimizedDirectory,
                                           suppressedExceptions, definingContext, isTrusted);
	}
	
    /**
     * Makes an array of dex/resource path elements, one per element of
     * the given array.
     */
    private static Element[] makeDexElements(List<File> files, File optimizedDirectory,
            List<IOException> suppressedExceptions, ClassLoader loader) {
        return makeDexElements(files, optimizedDirectory, suppressedExceptions, loader, false);
    }


    private static Element[] makeDexElements(List<File> files, File optimizedDirectory,
            List<IOException> suppressedExceptions, ClassLoader loader, boolean isTrusted) {
	}
	
    /*
     * TODO (dimitry): Revert after apps stops relying on the existence of this
     * method (see http://b/21957414 and http://b/26317852 for details)
     */
    @SuppressWarnings("unused")
    private static Element[] makePathElements(List<File> files, File optimizedDirectory,
            List<IOException> suppressedExceptions) {
        return makeDexElements(files, optimizedDirectory, suppressedExceptions, null);
    }

    /**
     * Makes an array of directory/zip path elements for the native library search path, one per
     * element of the given array.
     */
    private static NativeLibraryElement[] makePathElements(List<File> files) {
    }
}

参考 : 9.0.0_r8/xref/libcore/dalvik/src/main/java/dalvik/system/DexPathList.java

\rm Android \ 10.0 \ ( Q \ API \ 29 )

系统中创建 Element[] dexElements 的方法 :

/*package*/ final class DexPathList {
    private Element[] dexElements;
    DexPathList(ClassLoader definingContext, String dexPath,
            String librarySearchPath, File optimizedDirectory, boolean isTrusted) {
        // save dexPath for BaseDexClassLoader
        this.dexElements = makeDexElements(splitDexPath(dexPath), optimizedDirectory,
                                           suppressedExceptions, definingContext, isTrusted);
	}
	
    /**
     * Makes an array of dex/resource path elements, one per element of
     * the given array.
     */
    @UnsupportedAppUsage
    private static Element[] makeDexElements(List<File> files, File optimizedDirectory,
            List<IOException> suppressedExceptions, ClassLoader loader) {
        return makeDexElements(files, optimizedDirectory, suppressedExceptions, loader, false);
    }


    private static Element[] makeDexElements(List<File> files, File optimizedDirectory,
            List<IOException> suppressedExceptions, ClassLoader loader, boolean isTrusted) {
	}
	
    /*
     * TODO (dimitry): Revert after apps stops relying on the existence of this
     * method (see http://b/21957414 and http://b/26317852 for details)
     */
    @UnsupportedAppUsage
    @SuppressWarnings("unused")
    private static Element[] makePathElements(List<File> files, File optimizedDirectory,
            List<IOException> suppressedExceptions) {
        return makeDexElements(files, optimizedDirectory, suppressedExceptions, null);
    }

    /**
     * Makes an array of directory/zip path elements for the native library search path, one per
     * element of the given array.
     */
    @UnsupportedAppUsage
    private static NativeLibraryElement[] makePathElements(List<File> files) {
    }
}

参考 : 10.0.0_r6/xref/libcore/dalvik/src/main/java/dalvik/system/DexPathList.java

二、不同 Android 系统创建 dex 数组源码对比

\rm Android \ 5.0 、 5.1

系统需要反射如下 makeDexElements 方法 ;

    private static Element[] makeDexElements(ArrayList<File> files, File optimizedDirectory,
                                             ArrayList<IOException> suppressedExceptions){
	}

\rm Android \ 6.0 、 7.1、7.1、8.0、9.0、10

系统需要反射如下 makePathElements 方法 ;

    @SuppressWarnings("unused")
    private static Element[] makePathElements(List<File> files, File optimizedDirectory,
            List<IOException> suppressedExceptions) {
        return makeDexElements(files, optimizedDirectory, suppressedExceptions, null);
    }

三、 Android 5.1 及以下系统反射方法并创建 Element[] dexElements

Android 5.1 及以下系统反射方法并创建 Element[] dexElements :

        if(Build.VERSION.SDK_INT <=
                Build.VERSION_CODES.LOLLIPOP_MR1){ // 5.0, 5.1  makeDexElements

            // 反射 5.0, 5.1, 6.0 版本的 DexPathList 中的 makeDexElements 方法
            makeDexElements = reflexMethod(pathList, "makeDexElements",
                    ArrayList::class.java, File::class.java, ArrayList::class.java)
            var suppressedExceptions: ArrayList<IOException> = ArrayList<IOException>()
            addElements = makeDexElements.invoke(pathList, dexFiles,
                    optimizedDirectory,
                    suppressedExceptions) as Array<Any>

        }

四、 Android 6.0 及以下系统反射方法并创建 Element[] dexElements

Android 6.0 及以下系统反射方法并创建 Element[] dexElements :

        }else if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.M){   // 7.0 以上版本 makePathElements

            // 反射 7.0 以上版本的 DexPathList 中的 makeDexElements 方法
            makeDexElements = reflexMethod(pathList, "makePathElements",
                    ArrayList::class.java, File::class.java, ArrayList::class.java)
            var suppressedExceptions: ArrayList<IOException> = ArrayList<IOException>()
            addElements = makeDexElements.invoke(pathList, dexFiles,
                    optimizedDirectory,
                    suppressedExceptions) as Array<Any>

        }

五、完整代码示例

        /*
            2 . 在本应用中创建 Element[] dexElements 数组 , 用于存放解密后的 dex 文件
                不同的 Android 版本中 , 创建 Element[] dexElements 数组的方法不同 , 这里需要做兼容

         */
        var makeDexElements: Method
        var addElements : Array<Any>

        if(Build.VERSION.SDK_INT <=
                Build.VERSION_CODES.LOLLIPOP_MR1){ // 5.0, 5.1  makeDexElements

            // 反射 5.0, 5.1, 6.0 版本的 DexPathList 中的 makeDexElements 方法
            makeDexElements = reflexMethod(pathList, "makeDexElements",
                    ArrayList::class.java, File::class.java, ArrayList::class.java)
            var suppressedExceptions: ArrayList<IOException> = ArrayList<IOException>()
            addElements = makeDexElements.invoke(pathList, dexFiles,
                    optimizedDirectory,
                    suppressedExceptions) as Array<Any>

        }else if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.M){   // 7.0 以上版本 makePathElements

            // 反射 7.0 以上版本的 DexPathList 中的 makeDexElements 方法
            makeDexElements = reflexMethod(pathList, "makePathElements",
                    ArrayList::class.java, File::class.java, ArrayList::class.java)
            var suppressedExceptions: ArrayList<IOException> = ArrayList<IOException>()
            addElements = makeDexElements.invoke(pathList, dexFiles,
                    optimizedDirectory,
                    suppressedExceptions) as Array<Any>

        }

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原始发表：2020-11-17，如有侵权请联系 cloudcommunity@tencent.com 删除

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