diff --git a/src/main/java/com/reandroid/archive2/Archive.java b/src/main/java/com/reandroid/archive2/Archive.java
index 425f3cb..7ef397b 100644
--- a/src/main/java/com/reandroid/archive2/Archive.java
+++ b/src/main/java/com/reandroid/archive2/Archive.java
@@ -120,12 +120,4 @@ public class Archive {
         String name = archiveEntry.getName().replace('/', File.separatorChar);
         return new File(dir, name);
     }
-    // for test
-    public void writeSignatureData(File dir) throws IOException{
-        ApkSignatureBlock apkSignatureBlock = getApkSignatureBlock();
-        if(apkSignatureBlock == null){
-            throw new IOException("Does not have signature block");
-        }
-        apkSignatureBlock.writeSignatureData(dir);
-    }
 }
diff --git a/src/main/java/com/reandroid/archive2/block/ApkSignatureBlock.java b/src/main/java/com/reandroid/archive2/block/ApkSignatureBlock.java
index 0cfd348..e9d41d0 100644
--- a/src/main/java/com/reandroid/archive2/block/ApkSignatureBlock.java
+++ b/src/main/java/com/reandroid/archive2/block/ApkSignatureBlock.java
@@ -16,21 +16,61 @@
 package com.reandroid.archive2.block;
 
 
+import com.reandroid.archive2.block.pad.SchemePadding;
+import com.reandroid.arsc.io.BlockReader;
+
 import java.io.File;
+import java.io.FileFilter;
+import java.io.FileOutputStream;
 import java.io.IOException;
+import java.util.ArrayList;
+import java.util.Comparator;
 import java.util.List;
 
-public class ApkSignatureBlock extends LengthPrefixedList<SignatureInfo> {
+public class ApkSignatureBlock extends LengthPrefixedList<SignatureInfo>
+        implements Comparator<SignatureInfo> {
     public ApkSignatureBlock(SignatureFooter signatureFooter){
         super(true);
         setBottomBlock(signatureFooter);
     }
+    public ApkSignatureBlock(){
+        this(new SignatureFooter());
+    }
     public List<SignatureInfo> getSignatures(){
         return super.getElements();
     }
     public int countSignatures(){
         return super.getElementsCount();
     }
+    public void sortSignatures(){
+        sort(this);
+    }
+    public void updatePadding(){
+        SchemePadding schemePadding = getOrCreateSchemePadding();
+        schemePadding.setPadding(0);
+        sortSignatures();
+        refresh();
+        int size = countBytes();
+        int alignment = 4096;
+        int padding = (alignment - (size % alignment)) % alignment;
+        schemePadding.setPadding(padding);
+        refresh();
+    }
+    private SchemePadding getOrCreateSchemePadding(){
+        SignatureInfo signatureInfo = getSignature(SignatureId.PADDING);
+        if(signatureInfo == null){
+            signatureInfo = new SignatureInfo();
+            signatureInfo.setId(SignatureId.PADDING);
+            signatureInfo.setSignatureScheme(new SchemePadding());
+            add(signatureInfo);
+        }
+        SignatureScheme scheme = signatureInfo.getSignatureScheme();
+        if(!(scheme instanceof SchemePadding)){
+            scheme = new SchemePadding();
+            signatureInfo.setSignatureScheme(scheme);
+        }
+        return (SchemePadding) scheme;
+    }
     public SignatureInfo getSignature(SignatureId signatureId){
         for(SignatureInfo signatureInfo:getSignatures()){
             if(signatureInfo.getId().equals(signatureId)){
@@ -53,26 +93,69 @@ public class ApkSignatureBlock extends LengthPrefixedList<SignatureInfo> {
         super.onRefreshed();
         footer.setSignatureSize(getDataSize());
     }
-    // for test
-    public void writeSignatureData(File dir) throws IOException{
-        for(SignatureInfo signatureInfo:getElements()){
-            signatureInfo.writeToDir(dir);
+
+    public void writeRaw(File file) throws IOException{
+        refresh();
+        File dir = file.getParentFile();
+        if(dir != null && !dir.exists()){
+            dir.mkdirs();
         }
+        FileOutputStream outputStream = new FileOutputStream(file);
+        writeBytes(outputStream);
+        outputStream.close();
+    }
+    public List<File> writeSplitRawToDirectory(File dir) throws IOException{
+        refresh();
+        List<SignatureInfo> signatureInfoList = getElements();
+        List<File> writtenFiles = new ArrayList<>(signatureInfoList.size());
+        for(SignatureInfo signatureInfo:signatureInfoList){
+            File file = signatureInfo.writeRawToDirectory(dir);
+            writtenFiles.add(file);
+        }
+        return writtenFiles;
+    }
+    public void read(File file) throws IOException {
+        super.readBytes(new BlockReader(file));
+    }
+    public void scanSplitFiles(File dir) throws IOException {
+        if(!dir.isDirectory()){
+            throw new IOException("No such directory");
+        }
+        FileFilter filter = new FileFilter() {
+            @Override
+            public boolean accept(File file) {
+                if(!file.isFile()){
+                    return false;
+                }
+                String name = file.getName().toLowerCase();
+                return name.endsWith(SignatureId.FILE_EXT_RAW);
+            }
+        };
+        File[] files = dir.listFiles(filter);
+        if(files == null){
+            return;
+        }
+        for(File file:files){
+            addSplitRaw(file);
+        }
+        sortSignatures();
+    }
+    public SignatureInfo addSplitRaw(File signatureInfoFile) throws IOException {
+        SignatureInfo signatureInfo = new SignatureInfo();
+        signatureInfo.read(signatureInfoFile);
+        add(signatureInfo);
+        return signatureInfo;
+    }
+    @Override
+    public int compare(SignatureInfo info1, SignatureInfo info2) {
+        if(SignatureId.PADDING.equals(info1.getId())){
+            return 0;
+        }
+        if(SignatureId.PADDING.equals(info2.getId())){
+            return 1;
+        }
+        return 0;
     }
 
-    private static final long CONTENT_DIGESTED_CHUNK_MAX_SIZE_BYTES = 1024 * 1024;
-    public static final int ANDROID_COMMON_PAGE_ALIGNMENT_BYTES = 4096;
-
-    private static final byte[] APK_SIGNING_BLOCK_MAGIC = new byte[] {
-                    0x41, 0x50, 0x4b, 0x20, 0x53, 0x69, 0x67, 0x20,
-                    0x42, 0x6c, 0x6f, 0x63, 0x6b, 0x20, 0x34, 0x32,
-            };
-
-    public static final int VERSION_SOURCE_STAMP = 0;
-    public static final int VERSION_JAR_SIGNATURE_SCHEME = 1;
-    public static final int VERSION_APK_SIGNATURE_SCHEME_V2 = 2;
-    public static final int VERSION_APK_SIGNATURE_SCHEME_V3 = 3;
-    public static final int VERSION_APK_SIGNATURE_SCHEME_V31 = 31;
-    public static final int VERSION_APK_SIGNATURE_SCHEME_V4 = 4;
-
+    public static final String FILE_EXT = ".signature.block.bin";
 }
diff --git a/src/main/java/com/reandroid/archive2/block/LengthPrefixedList.java b/src/main/java/com/reandroid/archive2/block/LengthPrefixedList.java
index 922fe50..11cf1c2 100644
--- a/src/main/java/com/reandroid/archive2/block/LengthPrefixedList.java
+++ b/src/main/java/com/reandroid/archive2/block/LengthPrefixedList.java
@@ -25,6 +25,7 @@ import com.reandroid.arsc.item.IntegerItem;
 import com.reandroid.arsc.item.LongItem;
 
 import java.io.IOException;
+import java.util.Comparator;
 import java.util.List;
 
 public abstract class LengthPrefixedList<T extends Block> extends FixedBlockContainer
@@ -75,6 +76,9 @@ public abstract class LengthPrefixedList<T extends Block> extends FixedBlockCont
     public boolean remove(T element){
         return this.elements.remove(element);
     }
+    public void sort(Comparator<T> comparator){
+        this.elements.sort(comparator);
+    }
     @Override
     public void onReadBytes(BlockReader reader) throws IOException{
         if(!reader.isAvailable()){
diff --git a/src/main/java/com/reandroid/archive2/block/SignatureId.java b/src/main/java/com/reandroid/archive2/block/SignatureId.java
index 616e7be..501fc04 100644
--- a/src/main/java/com/reandroid/archive2/block/SignatureId.java
+++ b/src/main/java/com/reandroid/archive2/block/SignatureId.java
@@ -35,9 +35,9 @@ public class SignatureId {
     }
     public String toFileName() {
         if (this.name != null) {
-            return name + FILE_EXTENSION;
+            return name + FILE_EXT_RAW;
         }
-        return String.format("0x%08x", id) + FILE_EXTENSION;
+        return String.format("0x%08x", id) + FILE_EXT_RAW;
     }
     @Override
     public boolean equals(Object obj) {
@@ -66,7 +66,7 @@ public class SignatureId {
         if (name == null) {
             return null;
         }
-        String ext = FILE_EXTENSION;
+        String ext = FILE_EXT_RAW;
         if (name.endsWith(ext)) {
             name = name.substring(0, name.length() - ext.length());
         }
@@ -105,5 +105,5 @@ public class SignatureId {
             V2, V3, V31, STAMP_V1, STAMP_V2, PADDING, NULL
     };
 
-    private static final String FILE_EXTENSION = ".bin";
+    public static final String FILE_EXT_RAW = ".signature.info.bin";
 }
diff --git a/src/main/java/com/reandroid/archive2/block/SignatureInfo.java b/src/main/java/com/reandroid/archive2/block/SignatureInfo.java
index 4451961..94f59ba 100644
--- a/src/main/java/com/reandroid/archive2/block/SignatureInfo.java
+++ b/src/main/java/com/reandroid/archive2/block/SignatureInfo.java
@@ -28,6 +28,7 @@ import com.reandroid.arsc.io.BlockReader;
 import com.reandroid.arsc.item.IntegerItem;
 
 import java.io.File;
+import java.io.FileInputStream;
 import java.io.FileOutputStream;
 import java.io.IOException;
 
@@ -87,8 +88,7 @@ public class SignatureInfo extends LengthPrefixedBlock implements BlockLoad {
         }
         schemeContainer.setItem(scheme);
     }
-    // for test
-    public void writeData(File file) throws IOException{
+    public void writeRaw(File file) throws IOException{
         File dir = file.getParentFile();
         if(dir != null && !dir.exists()){
             dir.mkdirs();
@@ -97,12 +97,15 @@ public class SignatureInfo extends LengthPrefixedBlock implements BlockLoad {
         writeBytes(outputStream);
         outputStream.close();
     }
-    // for test
-    public File writeToDir(File dir) throws IOException{
-        File file = new File(dir, getId().toFileName());
-        writeData(file);
+    public File writeRawToDirectory(File dir) throws IOException{
+        String name = getIndex() + "_" + getId().toFileName();
+        File file = new File(dir, name);
+        writeRaw(file);
         return file;
     }
+    public void read(File file) throws IOException {
+        super.readBytes(new BlockReader(file));
+    }
     @Override
     public String toString() {
         return getId() + ", scheme: " + getSignatureScheme();
diff --git a/src/main/java/com/reandroid/archive2/block/pad/SchemePadding.java b/src/main/java/com/reandroid/archive2/block/pad/SchemePadding.java
index b088c18..f726ef3 100644
--- a/src/main/java/com/reandroid/archive2/block/pad/SchemePadding.java
+++ b/src/main/java/com/reandroid/archive2/block/pad/SchemePadding.java
@@ -30,6 +30,19 @@ public class SchemePadding extends SignatureScheme {
         this.byteArray = new ByteArray();
         addChild(this.byteArray);
     }
+    public int getPadding(){
+        return byteArray.size();
+    }
+    public void setPadding(int padding){
+        byteArray.setSize(padding);
+    }
+    public byte[] getPaddingBytes() {
+        return byteArray.getBytes();
+    }
+    public void setPadding(byte[] bytes){
+        byteArray.set(bytes);
+    }
+
     @Override
     public void onReadBytes(BlockReader reader) throws IOException{
         SignatureInfo signatureInfo = getSignatureInfo();
@@ -37,4 +50,8 @@ public class SchemePadding extends SignatureScheme {
         byteArray.setSize(size);
         super.onReadBytes(reader);
     }
+    @Override
+    public String toString(){
+        return "padding = " + getPadding();
+    }
 }
diff --git a/src/main/java/com/reandroid/archive2/writer/ApkWriter.java b/src/main/java/com/reandroid/archive2/writer/ApkWriter.java
index 9d80baa..d90b1c5 100644
--- a/src/main/java/com/reandroid/archive2/writer/ApkWriter.java
+++ b/src/main/java/com/reandroid/archive2/writer/ApkWriter.java
@@ -99,13 +99,13 @@ public class ApkWriter extends ZipFileOutput {
         logMessage("Writing signature block ...");
         long offset = position();
         int alignment = 4096;
-        int padding = (int) ((alignment - (offset % alignment)) % alignment);
+        int filesPadding = (int) ((alignment - (offset % alignment)) % alignment);
         OutputStream outputStream = getOutputStream();
-        if(padding > 0){
-            outputStream.write(new byte[padding]);
+        if(filesPadding > 0){
+            outputStream.write(new byte[filesPadding]);
         }
-        signatureBlock.refresh();
-        logVerbose("padding = " + padding + ", signatures = " + signatureBlock.countBytes());
+        logMessage("files padding = " + filesPadding);
+        signatureBlock.updatePadding();
         signatureBlock.writeBytes(outputStream);
     }
     private BufferFileInput writeBuffer(List<OutputSource> outputList) throws IOException {