diff --git a/src/main/java/component/IdentifierComponent.java b/src/main/java/component/IdentifierComponent.java
index 5f969dc..839c130 100644
--- a/src/main/java/component/IdentifierComponent.java
+++ b/src/main/java/component/IdentifierComponent.java
@@ -353,9 +353,8 @@ public class IdentifierComponent implements TlvComponentBase, IEncodingAble {
         } else if(isByteArray()){
             return StringHelper.escape(new String(this.byteArrayValue));
         }else{
-//            return StringHelper.FormatUint(this.intValue,10);
             // todo: 需要对long类型按照指定编码规则编码成字符串
-            return "";
+            return Long.valueOf(this.intValue).toString();
         }
     }
 }
diff --git a/src/main/java/component/KeyLocator.java b/src/main/java/component/KeyLocator.java
index 2365b27..1cffd4e 100644
--- a/src/main/java/component/KeyLocator.java
+++ b/src/main/java/component/KeyLocator.java
@@ -13,10 +13,9 @@ import encoding.*;
  * @Copyright: MIN-Group；国家重大科技基础设施——未来网络北大实验室；深圳市信息论与未来网络重点实验室
  */
 public class KeyLocator implements TlvComponentBase, IEncodingAble {
-    private Identifier identifier;
+    private Identifier identifier=new Identifier();
 
     public KeyLocator(){
-        identifier=new Identifier();
     }
 
     /**
@@ -24,15 +23,19 @@ public class KeyLocator implements TlvComponentBase, IEncodingAble {
      * @param block
      */
     public KeyLocator(Block block) throws ComponentException {
-        this.buildKeyLocatorByBlock(block);
+        if(!this.buildKeyLocatorByBlock(block)){
+            throw new ComponentException("KeyLocator(Block): block invalid.");
+        }
     }
 
     /**
      * 根据标识字符串 创建一个 KeyLocator
      * @param identifierString
      */
-    public KeyLocator(String identifierString){
-        this.buildKeyLocatorByString(identifierString);
+    public KeyLocator(String identifierString) throws ComponentException {
+        if(!this.buildKeyLocatorByString(identifierString)){
+            throw new ComponentException("KeyLocator(String): string invalid.");
+        }
     }
 
     /**
@@ -110,42 +113,33 @@ public class KeyLocator implements TlvComponentBase, IEncodingAble {
      */
     @Override
     public int wireEncode(Encoder encoder) throws ComponentException {
-        int totalLength=0;
-        // 编码 TLV-VALUE
-        int tmplen= 0;
         try {
-            tmplen = this.identifier.wireEncode(encoder);
-        } catch (ComponentException e) {
+            int totalLength = 0;
+            // 编码 TLV-VALUE
+            int tmplen = this.identifier.wireEncode(encoder);
+            if (tmplen <= 0) {
+                return -1;
+            }
+            totalLength += tmplen;
+
+            // 编码 TLV-LENGTH
+            tmplen = encoder.prependVarNumber(new VlInt(totalLength));
+            if (tmplen <= 0) {
+                return -1;
+            }
+            totalLength += tmplen;
+
+            // 编码 TLV-TYPE
+            tmplen = encoder.prependVarNumber(new VlInt(TLV.TlvKeyLocator));
+            if (tmplen <= 0) {
+                return -1;
+            }
+            totalLength += tmplen;
+
+            return totalLength;
+        } catch (ComponentException | EncoderException e) {
             throw new ComponentException("KeyLocator.wireEncode: "+e.getMessage());
         }
-        if(tmplen<=0){
-            return -1;
-        }
-        totalLength+=tmplen;
-
-        // 编码 TLV-LENGTH
-        try {
-            tmplen=encoder.prependVarNumber(new VlInt(totalLength));
-        } catch (EncoderException e) {
-            throw new ComponentException("KeyLocator.wireEncode: "+e.getMessage());
-        }
-        if(tmplen<=0){
-            return -1;
-        }
-        totalLength+=tmplen;
-
-        // 编码 TLV-TYPE
-        try {
-            tmplen=encoder.prependVarNumber(new VlInt(totalLength));
-        } catch (EncoderException e) {
-            throw new ComponentException("KeyLocator.wireEncode: "+e.getMessage());
-        }
-        if(tmplen<=0){
-            return -1;
-        }
-        totalLength+=tmplen;
-
-        return totalLength;
     }
 
     /**
@@ -157,17 +151,19 @@ public class KeyLocator implements TlvComponentBase, IEncodingAble {
     public boolean wireDecode(Block block) throws ComponentException {
         try {
             // 检查Type是否正确
-            if(!TLV.isValidIdentifierType(block.getType())){
+            if(!TLV.expectType(block.getType(),new VlInt(TLV.TlvKeyLocator))){
                 return false;
             }
             // 解析子 TLV
              if(!block.parseSubElements()){
                  return false;
              }
+
             // 判断是否有且仅有一个子TLV
             if(block.getSubElements().length()!=1){
                 return false;
             }
+
             // 解析子TLV为一个Identifier
             return this.identifier.wireDecode(block.getSubElements().getBlock(0));
         } catch (BlockException e) {
diff --git a/src/main/java/component/Signature.java b/src/main/java/component/Signature.java
index c81173c..429c631 100644
--- a/src/main/java/component/Signature.java
+++ b/src/main/java/component/Signature.java
@@ -10,25 +10,12 @@ import minsecurity.identity.Identity;
  * @Copyright: MIN-Group；国家重大科技基础设施——未来网络北大实验室；深圳市信息论与未来网络重点实验室
  */
 public class Signature {
-    public SignatureInfo getSigInfo() {
-        return sigInfo;
-    }
+    private SignatureInfo sigInfo=new SignatureInfo();
+    private SignatureValue sigValue=new SignatureValue();
 
-    public void setSigInfo(SignatureInfo sigInfo) {
-        this.sigInfo = sigInfo;
+    public Signature(){
     }
 
-    public SignatureValue getSigValue() {
-        return sigValue;
-    }
-
-    public void setSigValue(SignatureValue sigValue) {
-        this.sigValue = sigValue;
-    }
-
-    private SignatureInfo sigInfo;
-    private SignatureValue sigValue;
-
     /**
      * 根据网络身份创建一个 Signature
      * @param identity
@@ -46,4 +33,20 @@ public class Signature {
         this.sigInfo=signatureInfo;
         this.sigValue=signatureValue;
     }
+
+    public SignatureInfo getSigInfo() {
+        return sigInfo;
+    }
+
+    public void setSigInfo(SignatureInfo sigInfo) {
+        this.sigInfo = sigInfo;
+    }
+
+    public SignatureValue getSigValue() {
+        return sigValue;
+    }
+
+    public void setSigValue(SignatureValue sigValue) {
+        this.sigValue = sigValue;
+    }
 }
diff --git a/src/main/java/component/SignatureInfo.java b/src/main/java/component/SignatureInfo.java
index d4386d7..8522e27 100644
--- a/src/main/java/component/SignatureInfo.java
+++ b/src/main/java/component/SignatureInfo.java
@@ -14,22 +14,20 @@ import encoding.*;
  * @Copyright: MIN-Group；国家重大科技基础设施——未来网络北大实验室；深圳市信息论与未来网络重点实验室
  */
 public class SignatureInfo implements TlvComponentBase, IEncodingAble {
-    private SignatureType signatureType;
-    private KeyLocator keyLocator;
+    private SignatureType signatureType=new SignatureType();
+    private KeyLocator keyLocator=new KeyLocator();
 
     public SignatureInfo(){
-        signatureType=new SignatureType();
-        keyLocator=new KeyLocator();
     }
 
     /**
      * 根据签名值类型创建一个 SignatureInfo
      * @param value
      */
-    public SignatureInfo(SignatureAlgorithm value){
-        signatureType=new SignatureType();
-        keyLocator=new KeyLocator();
-        this.buildSignatureInfoBySignatureTypeValue(value);
+    public SignatureInfo(SignatureAlgorithm value) throws ComponentException {
+        if(!this.buildSignatureInfoBySignatureTypeValue(value)){
+            throw new ComponentException("SignatureInfo(SignatureAlgorithm value): value invalid");
+        }
     }
 
     /**
@@ -38,7 +36,10 @@ public class SignatureInfo implements TlvComponentBase, IEncodingAble {
      * @param locator
      */
     public SignatureInfo(SignatureAlgorithm value,KeyLocator locator) throws ComponentException {
-        this.buildSignatureInfoBySignatureTypeValueAndKeyLocator(value,locator);
+        if(!this.buildSignatureInfoBySignatureTypeValueAndKeyLocator(value,locator)){
+            throw new ComponentException("SignatureInfo(SignatureAlgorithm value,KeyLocator locator):" +
+                    " value or locator invalid");
+        }
     }
 
     /**
@@ -69,7 +70,7 @@ public class SignatureInfo implements TlvComponentBase, IEncodingAble {
             return false;
         }
 
-        if(!this.keyLocator.buildKeyLocatorByIdentifier(keyLocator.getIdentifier())){
+        if(!this.keyLocator.buildKeyLocatorByIdentifier(locator.getIdentifier())){
             return false;
         }
 
@@ -108,51 +109,41 @@ public class SignatureInfo implements TlvComponentBase, IEncodingAble {
      */
     @Override
     public int wireEncode(Encoder encoder) throws ComponentException {
-        int totalLength=0;
-        // 编码 TLV-VALUE
-        if(!this.keyLocator.isValid()){
-            // KeyLocator 是可选的，如果当前 SignatureInfo 对象有一个有效的 KeyLocator，则对其进行编码
-            int tmplen= 0;
-            try {
-                tmplen = this.keyLocator.wireEncode(encoder);
-            } catch (ComponentException e) {
-                throw new ComponentException("SignatureInfo.wireEncode: "+e.getMessage());
+        try {
+            int totalLength = 0;
+            // 编码 TLV-VALUE
+            if (this.keyLocator.isValid()) {
+                // KeyLocator 是可选的，如果当前 SignatureInfo 对象有一个有效的 KeyLocator，则对其进行编码
+                int tmplen = this.keyLocator.wireEncode(encoder);
+                if (tmplen <= 0) {
+                    return -1;
+                }
+                totalLength += tmplen;
             }
-            if(tmplen<=0){
+            int tmplen  = this.signatureType.wireEncode(encoder);
+            if (tmplen <= 0) {
                 return -1;
             }
-            totalLength+=tmplen;
-        }
-        int tmplen= 0;
-        tmplen = this.signatureType.wireEncode(encoder);
-        if(tmplen<=0){
-            return -1;
-        }
-        totalLength+=tmplen;
+            totalLength += tmplen;
 
-        // 编码 TLV-LENGTH
-        try {
-            tmplen=encoder.prependVarNumber(new VlInt(totalLength));
+            // 编码 TLV-LENGTH
+            tmplen = encoder.prependVarNumber(new VlInt(totalLength));
+            if (tmplen <= 0) {
+                return -1;
+            }
+            totalLength += tmplen;
+
+            // 编码 TLV-TYPE
+            tmplen = encoder.prependVarNumber(new VlInt(TLV.TlvSignatureInfo));
+            if (tmplen <= 0) {
+                return -1;
+            }
+            totalLength += tmplen;
+
+            return totalLength;
         } catch (EncoderException e) {
             throw new ComponentException("SignatureInfo.wireEncode: "+e.getMessage());
         }
-        if(tmplen<=0){
-            return -1;
-        }
-        totalLength+=tmplen;
-
-        // 编码 TLV-TYPE
-        try {
-            tmplen=encoder.prependVarNumber(new VlInt(TLV.TlvSignatureInfo));
-        } catch (EncoderException e) {
-            throw new ComponentException("SignatureInfo.wireEncode: "+e.getMessage());
-        }
-        if(tmplen<=0){
-            return -1;
-        }
-        totalLength+=tmplen;
-
-        return totalLength;
     }
 
     /**
@@ -162,57 +153,47 @@ public class SignatureInfo implements TlvComponentBase, IEncodingAble {
      */
     @Override
     public boolean wireDecode(Block block) throws ComponentException {
-        // 检查 Type 是否正确
-        if(!TLV.expectType(block.getType(),new VlInt(TLV.TlvSignatureInfo))){
-            return false;
-        }
-
-        // 解析子 TLV
         try {
-            if(!block.parseSubElements()){
+            // 检查 Type 是否正确
+            if (!TLV.expectType(block.getType(), new VlInt(TLV.TlvSignatureInfo))) {
                 return false;
             }
-        } catch (BlockException e) {
+
+            // 解析子 TLV
+            if (!block.parseSubElements()) {
+                return false;
+            }
+
+            boolean findSignatureType = false;
+            int elementSize = block.getSubElements().length();
+            for (int i = 0; i < elementSize; i++) {
+                Block cacheBlock = block.getSubElements().getBlock(i);
+                int type = cacheBlock.getType().getVlIntValue2Int();
+                switch (type) {
+                    case TLV.TlvSignatureType:
+                        if (!this.signatureType.wireDecode(cacheBlock)) {
+                            return false;
+                        }
+                        findSignatureType = true;
+                        break;
+                    case TLV.TlvKeyLocator:
+                        if (!this.keyLocator.wireDecode(cacheBlock)) {
+                            return false;
+                        }
+                        break;
+                    default:
+                        throw new ComponentException("SignatureInfo.wireDecode: SignatureInfo sub element type error");
+                }
+            }
+
+            // 缺失必要的 SignatureType 子TLV
+            if (!findSignatureType) {
+                throw new Error("SignatureInfo.wireDecode: Parse SignatureInfo error, require SignatureType sub-element");
+            }
+
+            return true;
+        } catch (BlockException | VlIntException e) {
             throw new ComponentException("SignatureInfo.wireDecode: "+e.getMessage());
         }
-
-        boolean findSignatureType=false;
-        int elementSize=block.getSubElements().length();
-        for (int i=0;i<elementSize;i++) {
-            Block cacheBlock= null;
-            try {
-                cacheBlock = block.getSubElements().getBlock(i);
-            } catch (BlockException e) {
-                throw new ComponentException("SignatureInfo.wireDecode:"+e.getMessage());
-            }
-            int type= 0;
-            try {
-                type = cacheBlock.getType().getVlIntValue2Int();
-            } catch (VlIntException e) {
-                e.printStackTrace();
-            }
-            switch (type){
-                case TLV.TlvSignatureType:
-                    if(!this.signatureType.wireDecode(cacheBlock)){
-                        return false;
-                    }
-                    findSignatureType=true;
-                case TLV.TlvKeyLocator:
-                    if(!this.keyLocator.wireDecode(cacheBlock)){
-                        return false;
-                    }
-                default:
-                    throw new ComponentException("SignatureInfo.wireDecode: SignatureInfo sub element type error");
-//                    return false;
-
-            }
-        }
-
-        // 缺失必要的 SignatureType 子TLV
-        if(!findSignatureType){
-            throw new Error("SignatureInfo.wireDecode: Parse SignatureInfo error, require SignatureType sub-element");
-        }
-
-        return true;
     }
 }
diff --git a/src/main/java/component/SignatureType.java b/src/main/java/component/SignatureType.java
index c141ca3..dfc68c3 100644
--- a/src/main/java/component/SignatureType.java
+++ b/src/main/java/component/SignatureType.java
@@ -108,43 +108,35 @@ public class SignatureType implements TlvComponentBase, IEncodingAble {
      */
     @Override
     public int wireEncode(Encoder encoder) throws ComponentException {
-        int totalLength=0;
-
-        // 编码 TLV-VALUE
-        int tmplen= 0;
         try {
-            tmplen = encoder.prependNonNegativeInteger(this.value.getSignatureAlgorithm());
+            int totalLength = 0;
+
+            // 编码 TLV-VALUE
+            int tmplen = encoder.prependNonNegativeInteger(this.value.getSignatureAlgorithm());
+            if (tmplen <= 0) {
+                return -1;
+            }
+            totalLength += tmplen;
+
+            // 编码 TLV-LENGTH
+            tmplen = encoder.prependVarNumber(new VlInt(totalLength));
+            if (tmplen <= 0) {
+                return -1;
+            }
+            totalLength += tmplen;
+
+            // 编码 TLV-TYPE
+            tmplen = encoder.prependVarNumber(new VlInt(TLV.TlvSignatureType));
+
+            if (tmplen <= 0) {
+                return -1;
+            }
+            totalLength += tmplen;
+
+            return totalLength;
         } catch (EncoderException e) {
             throw new ComponentException("SignatureType.wireEncode: "+e.getMessage());
         }
-        if(tmplen<=0){
-            return -1;
-        }
-        totalLength+=tmplen;
-
-        // 编码 TLV-LENGTH
-        try {
-            tmplen=encoder.prependVarNumber(new VlInt(totalLength));
-        } catch (EncoderException e) {
-            throw new ComponentException("SignatureType.wireEncode: "+e.getMessage());
-        }
-        if(tmplen<=0){
-            return -1;
-        }
-        totalLength+=tmplen;
-
-        // 编码 TLV-TYPE
-        try {
-            tmplen=encoder.prependVarNumber(new VlInt(TLV.TlvSignatureType));
-        } catch (EncoderException e) {
-            throw new ComponentException("SignatureType.wireEncode: "+e.getMessage());
-        }
-        if(tmplen<=0){
-            return -1;
-        }
-        totalLength+=tmplen;
-
-        return totalLength;
     }
 
     /**
@@ -154,23 +146,22 @@ public class SignatureType implements TlvComponentBase, IEncodingAble {
      */
     @Override
     public boolean wireDecode(Block block) throws ComponentException {
-        // 检查 Type 是否正确
-        if(!TLV.expectType(block.getType(),new VlInt(TLV.TlvSignatureType))){
-            return false;
-        }
-
-        // 尝试从 TLE-VALUE 中读取出一个非负整数
-        long result= 0;
         try {
-            result = TLV.readNonNegativeInteger(block.getValue(),0,block.getLength().getVlIntValue2Int());
+            // 检查 Type 是否正确
+            if (!TLV.expectType(block.getType(), new VlInt(TLV.TlvSignatureType))) {
+                return false;
+            }
+
+            // 尝试从 TLE-VALUE 中读取出一个非负整数
+            long result = TLV.readNonNegativeInteger(block.getValue(), 0, block.getLength().getVlIntValue2Int());
+            if (result < 0) {
+                return false;
+            }
+            this.value = new SignatureAlgorithm((int) result);
+
+            return true;
         } catch (TLVException | VlIntException e) {
             throw new ComponentException("SignatureType.wireDecode: " + e.getMessage());
         }
-        if(result<0){
-            return false;
-        }
-        this.value=new SignatureAlgorithm((int)result);
-
-        return true;
     }
 }
diff --git a/src/main/java/component/SignatureValue.java b/src/main/java/component/SignatureValue.java
index 05d5c13..4904e82 100644
--- a/src/main/java/component/SignatureValue.java
+++ b/src/main/java/component/SignatureValue.java
@@ -15,12 +15,17 @@ import encoding.*;
 public class SignatureValue implements TlvComponentBase, IEncodingAble {
     private byte[] value;
 
+    public SignatureValue(){
+    }
+
     /**
      * 根据签名值字节数组创建一个 SignatureValue
      * @param value
      */
-    public SignatureValue(byte[] value){
-        this.buildSignatureValueByByteArray(value);
+    public SignatureValue(byte[] value) throws ComponentException {
+        if(!this.buildSignatureValueByByteArray(value)){
+            throw new ComponentException("Signature(byte[] value): value invalid");
+        }
     }
 
     /**
@@ -28,7 +33,9 @@ public class SignatureValue implements TlvComponentBase, IEncodingAble {
      * @param block
      */
     public SignatureValue(Block block) throws ComponentException {
-        this.buildSignatureValueByBlock(block);
+        if(!this.buildSignatureValueByBlock(block)){
+            throw new ComponentException("Signature(Block block): block invalid");
+        }
     }
 
     /**
@@ -66,42 +73,33 @@ public class SignatureValue implements TlvComponentBase, IEncodingAble {
      */
     @Override
     public int wireEncode(Encoder encoder) throws ComponentException {
-        int totalLength=0;
-        // 编码 TLV-VALUE
-        int tmplen= 0;
         try {
-            tmplen = encoder.prependByteArray(this.value,new SizeT(this.value.length));
+            int totalLength = 0;
+            // 编码 TLV-VALUE
+            int tmplen = encoder.prependByteArray(this.value, new SizeT(this.value.length));
+            if (tmplen <= 0) {
+                return -1;
+            }
+            totalLength += tmplen;
+
+            // 编码 TLV-LENGTH
+            tmplen = encoder.prependVarNumber(new VlInt(totalLength));
+            if (tmplen <= 0) {
+                return -1;
+            }
+            totalLength += tmplen;
+
+            // 编码 TLV-TYPE
+            tmplen = encoder.prependVarNumber(new VlInt(TLV.TlvSignatureValue));
+            if (tmplen <= 0) {
+                return -1;
+            }
+            totalLength += tmplen;
+
+            return totalLength;
         } catch (EncoderException e) {
             throw new ComponentException("SignatureValue.wireEncode: "+e.getMessage());
         }
-        if(tmplen<=0){
-            return -1;
-        }
-        totalLength+=tmplen;
-
-        // 编码 TLV-LENGTH
-        try {
-            tmplen=encoder.prependVarNumber(new VlInt(totalLength));
-        } catch (EncoderException e) {
-            throw new ComponentException("SignatureValue.wireEncode: "+e.getMessage());
-        }
-        if(tmplen<=0){
-            return -1;
-        }
-        totalLength+=tmplen;
-
-        // 编码 TLV-TYPE
-        try {
-            tmplen=encoder.prependVarNumber(new VlInt(TLV.TlvSignatureValue));
-        } catch (EncoderException e) {
-            throw new ComponentException("SignatureValue.wireEncode: "+e.getMessage());
-        }
-        if(tmplen<=0){
-            return -1;
-        }
-        totalLength+=tmplen;
-
-        return totalLength;
     }
 
     /**
@@ -111,19 +109,18 @@ public class SignatureValue implements TlvComponentBase, IEncodingAble {
      */
     @Override
     public boolean wireDecode(Block block) throws ComponentException {
-        // 检查 Type 是否正确
-        if(!TLV.expectType(block.getType(),new VlInt(TLV.TlvSignatureValue))){
-            return false;
-        }
-
-        int len= 0;
         try {
-            len = block.getLength().getVlIntValue2Int();
+            // 检查 Type 是否正确
+            if (!TLV.expectType(block.getType(), new VlInt(TLV.TlvSignatureValue))) {
+                return false;
+            }
+
+            int len = block.getLength().getVlIntValue2Int();
+            this.value = new byte[len];
+            System.arraycopy(block.getValue(), 0, this.value, 0, len);
+            return true;
         } catch (VlIntException e) {
             throw new ComponentException("SignatureValue.wireDecode: "+e.getMessage());
         }
-        this.value=new byte[len];
-        System.arraycopy(block.getValue(),0,this.value,0,len);
-        return true;
     }
 }
diff --git a/src/main/java/encoding/Block.java b/src/main/java/encoding/Block.java
index 856c12d..0f74ba3 100644
--- a/src/main/java/encoding/Block.java
+++ b/src/main/java/encoding/Block.java
@@ -247,7 +247,6 @@ public class Block {
         if ((this.value.length == 0) || this.elements.length() != 0) {
             return true;
         }
-
         // 循环解析所有的一级子TLV
         for (int start = 0; start < this.value.length; ) {
             // 读取 TLV-TYPE
diff --git a/src/main/java/minsecurity/crypto/HashAlgo.java b/src/main/java/minsecurity/crypto/HashAlgo.java
index 949cb87..c88a5d9 100644
--- a/src/main/java/minsecurity/crypto/HashAlgo.java
+++ b/src/main/java/minsecurity/crypto/HashAlgo.java
@@ -19,7 +19,7 @@ import java.nio.charset.StandardCharsets;
  * @Copyright: MIN-Group；国家重大科技基础设施——未来网络北大实验室；深圳市信息论与未来网络重点实验室
  */
 public class HashAlgo {
-    // TODO: 单元测试   基本上只需要对sm3做单元测试
+
     ///////////////
     ///// SM3 /////
     ///////////////
diff --git a/src/main/java/packet/Data.java b/src/main/java/packet/Data.java
index 8918e81..b6cf124 100644
--- a/src/main/java/packet/Data.java
+++ b/src/main/java/packet/Data.java
@@ -212,10 +212,12 @@ public class Data implements IEncodingAble, InteractWithField {
                         if (!this.freshnessPeriod.wireDecode(newblock)) {
                             return false;
                         }
+                        break;
                     case TLV.TlvPayload:
                         if (!this.payload.wireDecode(newblock)) {
                             return false;
                         }
+                        break;
                     default:
                         // TODO: 这边可以规定哪些范围是自定义的，哪些是预留的，然后根据需要这边抛出错误
 
diff --git a/src/main/java/packet/Interest.java b/src/main/java/packet/Interest.java
index 7d20de9..2e987f8 100644
--- a/src/main/java/packet/Interest.java
+++ b/src/main/java/packet/Interest.java
@@ -258,26 +258,32 @@ public class Interest implements InteractWithField, IEncodingAble {
                         if (!this.canBePrefix.wireDecode(newblock)) {
                             return false;
                         }
+                        break;
                     case TLV.TlvMustBeRefresh:
                         if (!this.mustBeRefresh.wireDecode(newblock)) {
                             return false;
                         }
+                        break;
                     case TLV.TlvInterestLifeTime:
                         if (!this.interestLifeTime.wireDecode(newblock)) {
                             return false;
                         }
+                        break;
                     case TLV.TlvNonce:
                         if (!this.nonce.wireDecode(newblock)) {
                             return false;
                         }
+                        break;
                     case TLV.TlvHopLimit:
                         if (!this.hopLimit.wireDecode(newblock)) {
                             return false;
                         }
+                        break;
                     case TLV.TlvPayload:
                         if (!this.payload.wireDecode(newblock)) {
                             return false;
                         }
+                        break;
                     default:
                         // TODO: 这边可以规定哪些范围是自定义的，哪些是预留的，然后根据需要这边抛出错误
 
diff --git a/src/main/java/packet/MINPacket.java b/src/main/java/packet/MINPacket.java
index afe8c59..958b98d 100644
--- a/src/main/java/packet/MINPacket.java
+++ b/src/main/java/packet/MINPacket.java
@@ -147,21 +147,25 @@ public class MINPacket implements IEncodingAble {
 
                         // 标示解析到了至少一个以上的合法标识
                         existIdentifier = true;
+                        break;
                     case TLV.TlvSignatureField: // 签名区
                         // 解析签名区，保证如果存在签名，则签名均符合格式
                         if (!this.signatureField.wireDecode(cacheBlock)) {
                             return false;
                         }
+                        break;
                     case TLV.TlvReadOnlyField: // 只读区
                         // 解析只读区
                         if (!this.readOnlyField.wireDecode(cacheBlock)) {
                             return false;
                         }
+                        break;
                     case TLV.TlvMutableField: // 可变区
                         // 解析可变区
                         if (!this.mutableField.wireDecode(cacheBlock)) {
                             return false;
                         }
+                        break;
                     default:
                         return false;
 
diff --git a/src/test/java/component/KeyLocatorTest.java b/src/test/java/component/KeyLocatorTest.java
new file mode 100644
index 0000000..a1a226b
--- /dev/null
+++ b/src/test/java/component/KeyLocatorTest.java
@@ -0,0 +1,100 @@
+package component;
+
+import encoding.*;
+import org.checkerframework.checker.units.qual.K;
+import org.junit.Test;
+import packet.PacketException;
+
+import java.util.Arrays;
+
+/*
+ * @Author: Wang Feng
+ * @Description:
+ * @Version: 1.0.0
+ * @Date: 19:08 2021/3/31
+ * @Copyright: MIN-Group；国家重大科技基础设施——未来网络北大实验室；深圳市信息论与未来网络重点实验室
+ */
+public class KeyLocatorTest {
+    @Test
+    public void TestCreateKeyLocatorByString() throws ComponentException {
+        String str="/install/hello/王";
+        KeyLocator got=new KeyLocator(str);
+        System.out.println("keyLocator: "+got.getIdentifier().toUri());
+    }
+
+    @Test
+    public void TestCreateKeyLocatorByBlock() throws EncoderException, ComponentException, BlockException {
+        Encoder encoder=new Encoder();
+        encoder.encoderReset(new SizeT(Encoder.MaxPacketSize),new SizeT(0));
+        String str="/min/王/123/哈哈哈哈";
+        IdentifierWrapper got=new IdentifierWrapper().createCommonIdentifierByString(str);
+        System.out.println("type: "+got.getTlvType());
+        got.wireEncode(encoder);
+        byte[] rawBuf=encoder.getBuffer();
+        System.out.println("buf: "+ Arrays.toString(rawBuf));
+//        rawBuf[4]=101;
+        byte[] buf2=new byte[rawBuf.length-2];
+        System.arraycopy(rawBuf,2,buf2,0,rawBuf.length-2);
+        System.out.println("buf2: "+ Arrays.toString(buf2));
+        Block block=new Block(new VlInt(203),new VlInt(rawBuf.length-2),buf2,true);
+        block.parseSubElements();
+        System.out.println(block.getSubElements().getBlock(0).getType());
+//        System.out.println(block.getSubElements().getBlock(1).getType());
+        KeyLocator gotKey=new KeyLocator(block);
+        System.out.println(gotKey.getIdentifier().toUri());
+        System.out.println(gotKey.isValid());
+    }
+
+    @Test
+    public void TestCreateKeyLocatorByComponents() throws ComponentException {
+        IdentifierComponent component=new IdentifierComponent("min");
+        IdentifierComponent component1=new IdentifierComponent("pku");
+        IdentifierComponent component2=new IdentifierComponent("王");
+        IdentifierComponentContainer gotComponent=new IdentifierComponentContainer();
+        gotComponent.addElement(component);
+        gotComponent.addElement(component1);
+        gotComponent.addElement(component2);
+        KeyLocator gotKey=new KeyLocator(gotComponent);
+        System.out.println(gotKey.getIdentifier().toUri());
+    }
+
+    @Test
+    public void TestCreateKeyLocatorByIdentifier() throws ComponentException, EncoderException {
+        Identifier gotIdentifier=new Identifier("/min/pku/111");
+        KeyLocator gotKey=new KeyLocator(gotIdentifier);
+        System.out.println(gotKey.getIdentifier().toUri());
+
+        IdentifierComponent component=new IdentifierComponent("min");
+        IdentifierComponent component1=new IdentifierComponent("pku");
+        IdentifierComponent component2=new IdentifierComponent(111);
+        IdentifierComponentContainer gotComponent=new IdentifierComponentContainer();
+        gotComponent.addElement(component);
+        gotComponent.addElement(component1);
+        gotComponent.addElement(component2);
+        KeyLocator gotKey1=new KeyLocator(gotComponent);
+        System.out.println(gotKey1.getIdentifier().toUri());
+
+        Encoder encoder=new Encoder();
+        encoder.encoderReset(new SizeT(Encoder.MaxPacketSize),new SizeT(0));
+        gotKey.wireEncode(encoder);
+        System.out.println(Arrays.toString(encoder.getBuffer()));
+
+        Encoder encoder1=new Encoder();
+        encoder1.encoderReset(new SizeT(Encoder.MaxPacketSize),new SizeT(0));
+        gotKey1.wireEncode(encoder1);
+        System.out.println(Arrays.toString(encoder1.getBuffer()));
+    }
+
+    @Test
+    public void TestKeyLocator_WireDecode() throws ComponentException, BlockException, EncoderException, PacketException {
+        Identifier gotIdentifier=new Identifier("/min/pku/111");
+        KeyLocator gotKey=new KeyLocator(gotIdentifier);
+        System.out.println(gotKey.getIdentifier().toUri());
+
+        Block block=new SelfEncodingBase().selfWireEncode(gotKey);
+
+        KeyLocator newK=new KeyLocator();
+        newK.wireDecode(block);
+        System.out.println(newK.getIdentifier().toUri());
+    }
+}
diff --git a/src/test/java/component/SignatureInfoTest.java b/src/test/java/component/SignatureInfoTest.java
new file mode 100644
index 0000000..3b5eac2
--- /dev/null
+++ b/src/test/java/component/SignatureInfoTest.java
@@ -0,0 +1,93 @@
+package component;
+
+import encoding.*;
+import org.checkerframework.checker.units.qual.A;
+import org.junit.Test;
+
+import java.util.Arrays;
+
+/*
+ * @Author: Wang Feng
+ * @Description:
+ * @Version: 1.0.0
+ * @Date: 20:27 2021/3/31
+ * @Copyright: MIN-Group；国家重大科技基础设施——未来网络北大实验室；深圳市信息论与未来网络重点实验室
+ */
+public class SignatureInfoTest {
+    @Test
+    public void TestCrateSignatureInfoBySignatureTypeValue() throws ComponentException {
+        SignatureAlgorithm value=new SignatureAlgorithm(0);
+        SignatureInfo get=new SignatureInfo(value);
+        System.out.println(get.getSignatureType().getValue().getSignatureAlgorithm());
+    }
+
+    @Test
+    public  void TestCreateSignatureInfoByBlock() throws ComponentException, EncoderException, BlockException {
+        SignatureAlgorithm value=new SignatureAlgorithm(0);
+        SignatureInfo get=new SignatureInfo(value);
+        System.out.println(get.getSignatureType().getValue().getSignatureAlgorithm());
+        Encoder encoder=new Encoder();
+        encoder.encoderReset(new SizeT(Encoder.MaxPacketSize),new SizeT(0));
+        System.out.println("get buf size: "+get.wireEncode(encoder));
+        byte[] buf=encoder.getBuffer();
+        System.out.println(Arrays.toString(buf));
+        Block block=new Block(buf,false);
+        System.out.println(block.parseSubElements());
+        System.out.println("subElem: "+block.getSubElements().length());
+        SignatureInfo got=new SignatureInfo(block);
+        got.wireDecode(block);
+        System.out.println("sigAlgo: "+got.getSignatureType().getValue().getSignatureAlgorithm());
+        System.out.println("uri: "+got.getKeyLocator().getIdentifier().toUri());
+        encoder.encoderReset(new SizeT(Encoder.MaxPacketSize),new SizeT(0));
+        System.out.println("got buf size: "+got.wireEncode(encoder));
+        System.out.println(Arrays.toString(encoder.getBuffer()));
+    }
+
+    @Test
+    public void TestSignatureInfo_WireDecodeWithValue() throws ComponentException, EncoderException, BlockException {
+        SignatureAlgorithm value=new SignatureAlgorithm(0);
+        SignatureInfo get=new SignatureInfo(value);
+        System.out.println(get.getSignatureType().getValue().getSignatureAlgorithm());
+        Encoder encoder=new Encoder();
+        encoder.encoderReset(new SizeT(Encoder.MaxPacketSize),new SizeT(0));
+        System.out.println("get buf size: "+get.wireEncode(encoder));
+        byte[] buf=encoder.getBuffer();
+        System.out.println(Arrays.toString(buf));
+        Block block=new Block(buf,false);
+        System.out.println(block.parseSubElements());
+        System.out.println("subElem: "+block.getSubElements().length());
+        for (int i = 0; i < block.getSubElements().length(); i++) {
+            System.out.println(block.getSubElements().getBlock(i).getType());
+            System.out.println(Arrays.toString(block.getSubElements().getBlock(i).getValue()));
+        }
+        System.out.println(get.getSignatureType().getValue().getSignatureAlgorithm());
+    }
+
+    @Test
+    public void TestSignatureInfo_WireDecodeWithLocator() throws ComponentException, EncoderException, BlockException {
+        KeyLocator keyLocator=new KeyLocator("/mnfdinstall");
+        System.out.println(keyLocator.getIdentifier().toUri());
+        SignatureAlgorithm value=new SignatureAlgorithm(0);
+        SignatureInfo get=new SignatureInfo(value,keyLocator);
+        System.out.println("algo: "+get.getSignatureType().getValue().getSignatureAlgorithm());
+        System.out.println(get.getKeyLocator().getIdentifier().toUri());
+
+        Encoder encoder=new Encoder();
+        encoder.encoderReset(new SizeT(Encoder.MaxPacketSize),new SizeT(0));
+        System.out.println("get buf size: "+get.wireEncode(encoder));
+        byte[] buf=encoder.getBuffer();
+        System.out.println("buf: "+Arrays.toString(buf));
+
+        Block block=new Block(buf,false);
+        System.out.println(block.parseSubElements());
+        System.out.println("subElem: "+block.getSubElements().length());
+
+        SignatureInfo newSig=new SignatureInfo();
+        newSig.wireDecode(block);
+        encoder.encoderReset(new SizeT(Encoder.MaxPacketSize),new SizeT(0));
+        newSig.wireEncode(encoder);
+        System.out.println("new buf: "+ Arrays.toString(encoder.getBuffer()));
+        System.out.println("new algo: "+newSig.getSignatureType().getValue().getSignatureAlgorithm());
+        System.out.println("new uri: "+newSig.getKeyLocator().getIdentifier().toUri());
+    }
+}
diff --git a/src/test/java/component/SignatureTest.java b/src/test/java/component/SignatureTest.java
new file mode 100644
index 0000000..a5c27ae
--- /dev/null
+++ b/src/test/java/component/SignatureTest.java
@@ -0,0 +1,21 @@
+package component;
+
+import org.junit.Test;
+
+import java.util.Arrays;
+
+/*
+ * @Author: Wang Feng
+ * @Description:
+ * @Version: 1.0.0
+ * @Date: 20:52 2021/4/1
+ * @Copyright: MIN-Group；国家重大科技基础设施——未来网络北大实验室；深圳市信息论与未来网络重点实验室
+ */
+public class SignatureTest {
+    @Test
+    public void testSignature(){
+        Signature signature=new Signature();
+        System.out.println(signature.getSigInfo().getSignatureType().getValue().getSignatureAlgorithm());
+        System.out.println(Arrays.toString(signature.getSigValue().getValue()));
+    }
+}
diff --git a/src/test/java/component/SignatureTypeTest.java b/src/test/java/component/SignatureTypeTest.java
new file mode 100644
index 0000000..f835bc0
--- /dev/null
+++ b/src/test/java/component/SignatureTypeTest.java
@@ -0,0 +1,76 @@
+package component;
+
+import encoding.*;
+import org.junit.Test;
+import packet.PacketException;
+
+import java.util.Arrays;
+
+import static org.junit.Assert.assertEquals;
+
+/*
+ * @Author: Wang Feng
+ * @Description:
+ * @Version: 1.0.0
+ * @Date: 10:48 2021/3/31
+ * @Copyright: MIN-Group；国家重大科技基础设施——未来网络北大实验室；深圳市信息论与未来网络重点实验室
+ */
+public class SignatureTypeTest {
+    @Test
+    public void TestCreateSignatureTypeByBlock() throws EncoderException, ComponentException, BlockException {
+        Encoder encoder=new Encoder();
+        encoder.encoderReset(new SizeT(Encoder.MaxPacketSize),new SizeT(0));
+        String str="/min/pkusz";
+        IdentifierWrapper got=new IdentifierWrapper().createCommonIdentifierByString(str);
+        System.out.println("type: "+got.getTlvType().toString());
+        got.wireEncode(encoder);
+        byte[] rawBuf=encoder.getBuffer();
+        System.out.println("buf: "+ Arrays.toString(rawBuf));
+        byte[] buf2=new byte[4];
+        System.arraycopy(rawBuf,14,buf2,0,4);
+        Block block=new Block(new VlInt(202),new VlInt(4),buf2,true);
+        System.out.println("block length: "+block.getLength());
+        SignatureType gotContent=new SignatureType(block);
+        System.out.println("sigtype: "+gotContent.getValue().getSignatureAlgorithm());
+    }
+
+    @Test
+    public void TestCreateSignatureTypeByValue() throws PacketException, EncoderException, BlockException, ComponentException {
+        SignatureAlgorithm value=new SignatureAlgorithm(0);
+        SignatureType got=new SignatureType(value);
+        System.out.println(got.getValue().getSignatureAlgorithm());
+        Block rawBlock=new SelfEncodingBase().selfWireEncode(got);
+        System.out.println(rawBlock.getType()+" "+rawBlock.getLength()+" "+Arrays.toString(rawBlock.getValue()));
+    }
+
+    @Test
+    public void TestSignatureType_WireEncode() throws PacketException, EncoderException, BlockException, ComponentException {
+        SignatureAlgorithm value=new SignatureAlgorithm(0);
+        SignatureType got=new SignatureType(value);
+        System.out.println(got.getValue().getSignatureAlgorithm());
+        Block rawBlock=new SelfEncodingBase().selfWireEncode(got);
+        System.out.println(rawBlock.getType()+" "+rawBlock.getLength()+" "+Arrays.toString(rawBlock.getValue()));
+        Encoder encoder=new Encoder();
+        encoder.encoderReset(new SizeT(Encoder.MaxPacketSize),new SizeT(0));
+        got.wireEncode(encoder);
+        byte[] gotBuf=encoder.getBuffer();
+        System.out.println(Arrays.toString(gotBuf));
+    }
+
+    @Test
+    public void TestCreateSignatureTypeByValue2() throws PacketException, EncoderException, BlockException, ComponentException {
+        SignatureAlgorithm value=new SignatureAlgorithm(0);
+        SignatureType got=new SignatureType(value);
+        System.out.println(got.getValue().getSignatureAlgorithm());
+        Block rawBlock=new SelfEncodingBase().selfWireEncode(got);
+        System.out.println(rawBlock.getType()+" "+rawBlock.getLength()+" "+Arrays.toString(rawBlock.getValue()));
+        Encoder encoder=new Encoder();
+        encoder.encoderReset(new SizeT(Encoder.MaxPacketSize),new SizeT(0));
+        got.wireEncode(encoder);
+        byte[] gotBuf=encoder.getBuffer();
+        System.out.println(Arrays.toString(gotBuf));
+        SignatureType newSig=new SignatureType();
+        newSig.wireDecode(rawBlock);
+        System.out.println(newSig.getValue().getSignatureAlgorithm());
+    }
+}
diff --git a/src/test/java/component/SignatureValueTest.java b/src/test/java/component/SignatureValueTest.java
new file mode 100644
index 0000000..976cb24
--- /dev/null
+++ b/src/test/java/component/SignatureValueTest.java
@@ -0,0 +1,69 @@
+package component;
+
+import encoding.*;
+import org.junit.Test;
+
+import java.util.Arrays;
+
+/*
+ * @Author: Wang Feng
+ * @Description:
+ * @Version: 1.0.0
+ * @Date: 20:21 2021/4/1
+ * @Copyright: MIN-Group；国家重大科技基础设施——未来网络北大实验室；深圳市信息论与未来网络重点实验室
+ */
+public class SignatureValueTest {
+    @Test
+    public void TestCreateSignatureValueByByteArray() throws ComponentException {
+         byte[] buf={(byte)1, (byte)2, (byte)3, (byte)4, (byte)5, (byte)6, (byte)7, (byte)8};
+         SignatureValue got=new SignatureValue(buf);
+         System.out.println(Arrays.toString(got.getValue()));
+    }
+
+    @Test
+    public void TestCreateSignatureValueByBlock() throws EncoderException, ComponentException, BlockException {
+        Encoder encoder=new Encoder();
+        encoder.encoderReset(new SizeT(Encoder.MaxPacketSize),new SizeT(0));
+        String str="/min/pku";
+        IdentifierWrapper got=new IdentifierWrapper().createCommonIdentifierByString(str);
+        System.out.println("type: "+got.getTlvType());
+        got.wireEncode(encoder);
+        byte[] rawBuf=encoder.getBuffer();
+        System.out.println("buf: "+Arrays.toString(rawBuf));
+
+        byte[] a=new byte[4];
+        System.arraycopy(rawBuf,12,a,0,4);
+        Block block=new Block(new VlInt(200),new VlInt(4),a,true);
+        SignatureValue gotValue=new SignatureValue(block);
+        System.out.println("sv value: "+Arrays.toString(gotValue.getValue()));
+    }
+
+    @Test
+    public void TestSignatureValue_WireEncode() throws BlockException, ComponentException, EncoderException {
+        Encoder encoder=new Encoder();
+        encoder.encoderReset(new SizeT(Encoder.MaxPacketSize),new SizeT(0));
+        String str="/min/pku";
+        IdentifierWrapper got=new IdentifierWrapper().createCommonIdentifierByString(str);
+        System.out.println("type: "+got.getTlvType());
+        got.wireEncode(encoder);
+        byte[] rawBuf=encoder.getBuffer();
+        System.out.println("buf: "+Arrays.toString(rawBuf));
+
+        byte[] a=new byte[4];
+        System.arraycopy(rawBuf,12,a,0,4);
+        Block block=new Block(new VlInt(200),new VlInt(4),a,true);
+        SignatureValue gotValue=new SignatureValue(block);
+        System.out.println("sv value: "+Arrays.toString(gotValue.getValue()));
+
+        encoder.encoderReset(new SizeT(Encoder.MaxPacketSize),new SizeT(0));
+        gotValue.wireEncode(encoder);
+        System.out.println("all: "+Arrays.toString(encoder.getBuffer()));
+        byte[] bytes=encoder.getBuffer();
+        Block block1=new Block(bytes,false);
+        SignatureValue newSig=new SignatureValue(block1);
+        System.out.println("new value: "+Arrays.toString(newSig.getValue()));
+        encoder.encoderReset(new SizeT(Encoder.MaxPacketSize),new SizeT(0));
+        newSig.wireEncode(encoder);
+        System.out.println("new all: "+Arrays.toString(encoder.getBuffer()));
+    }
+}
diff --git a/src/test/java/minsecurity/crypto/TestSM3.java b/src/test/java/minsecurity/crypto/TestSM3.java
new file mode 100644
index 0000000..e02ea03
--- /dev/null
+++ b/src/test/java/minsecurity/crypto/TestSM3.java
@@ -0,0 +1,31 @@
+package minsecurity.crypto;
+
+import org.bouncycastle.pqc.math.linearalgebra.ByteUtils;
+import org.junit.Test;
+
+import static org.junit.Assert.*;
+
+/*
+ * @Author: feng Zhao
+ * @Description:
+ * @Version: 1.0.0
+ * @Date: 14:56 2021/3/29
+ * @Copyright: MIN-Group；国家重大科技基础设施——未来网络北大实验室；深圳市信息论与未来网络重点实验室
+ */
+
+public class TestSM3 {
+
+    @Test
+    public void testSm3() {
+        HashAlgo hashAlgo = new HashAlgo();
+        String srcString = "123456";
+        byte[] srcData = srcString.getBytes();
+        byte[] resultHash = hashAlgo.sm3(srcData);
+        String sm3HexString = ByteUtils.toHexString(resultHash);
+
+        byte[] sm3Hash = ByteUtils.fromHexString(sm3HexString);
+        byte[] newHash = hashAlgo.sm3(srcString);
+        assertArrayEquals(sm3Hash,newHash);
+    }
+
+}