diff --git a/device-fingerprint-tool/src/main/java/com/sunyard/cisd/Main.java b/device-fingerprint-tool/src/main/java/com/sunyard/cisd/Main.java
index 34162d3..0269019 100644
--- a/device-fingerprint-tool/src/main/java/com/sunyard/cisd/Main.java
+++ b/device-fingerprint-tool/src/main/java/com/sunyard/cisd/Main.java
@@ -36,18 +36,18 @@ public class Main {
             PublicKey publicKey = SM2Util.loadPublicKey("/sm2_public_key.pem");
             String publicKeyPEM = SM2Util.publicKeyToPEM(publicKey);
             
-            SM2Util.writeFile(SIGN_FILE, signature);
+            SM3Util.writeFile(SIGN_FILE, signature);
             System.out.println("签名文件已保存: " + SIGN_FILE);
             
-            String signSm3 = SM2Util.sm3DigestHex(signature);
-            SM2Util.writeFile(SIGN_SM3_FILE, signSm3);
+            String signSm3 = SM3Util.sm3DigestHex(signature);
+            SM3Util.writeFile(SIGN_SM3_FILE, signSm3);
             System.out.println("签名SM3校验值已保存: " + SIGN_SM3_FILE + " (" + signSm3 + ")");
             
-            SM2Util.writeFile(PUBLIC_KEY_FILE, publicKeyPEM);
+            SM3Util.writeFile(PUBLIC_KEY_FILE, publicKeyPEM);
             System.out.println("公钥文件已保存: " + PUBLIC_KEY_FILE);
             
-            String publicKeySm3 = SM2Util.sm3DigestHex(publicKeyPEM.getBytes(StandardCharsets.UTF_8));
-            SM2Util.writeFile(PUBLIC_KEY_SM3_FILE, publicKeySm3);
+            String publicKeySm3 = SM3Util.sm3DigestHex(publicKeyPEM.getBytes(StandardCharsets.UTF_8));
+            SM3Util.writeFile(PUBLIC_KEY_SM3_FILE, publicKeySm3);
             System.out.println("公钥SM3校验值已保存: " + PUBLIC_KEY_SM3_FILE + " (" + publicKeySm3 + ")");
             
             boolean verified = SM2Util.verify(plainText.getBytes(StandardCharsets.UTF_8), signature, publicKey);
diff --git a/device-fingerprint-tool/src/main/java/com/sunyard/cisd/SM2Util.java b/device-fingerprint-tool/src/main/java/com/sunyard/cisd/SM2Util.java
index a4c2dc4..6870135 100644
--- a/device-fingerprint-tool/src/main/java/com/sunyard/cisd/SM2Util.java
+++ b/device-fingerprint-tool/src/main/java/com/sunyard/cisd/SM2Util.java
@@ -1,42 +1,14 @@
 package com.sunyard.cisd;
 
-import org.bouncycastle.asn1.ASN1ObjectIdentifier;
-import org.bouncycastle.asn1.gm.GMObjectIdentifiers;
-import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
-import org.bouncycastle.asn1.x9.X9ECParameters;
-import org.bouncycastle.crypto.Digest;
-import org.bouncycastle.crypto.engines.SM2Engine;
-import org.bouncycastle.crypto.params.ECDomainParameters;
-import org.bouncycastle.crypto.params.ECPrivateKeyParameters;
-import org.bouncycastle.crypto.params.ECPublicKeyParameters;
-import org.bouncycastle.crypto.params.ParametersWithRandom;
-import org.bouncycastle.crypto.signers.SM2Signer;
-import org.bouncycastle.crypto.digests.SM3Digest;
 import org.bouncycastle.jce.ECNamedCurveTable;
 import org.bouncycastle.jce.provider.BouncyCastleProvider;
 import org.bouncycastle.jce.spec.ECParameterSpec;
-import org.bouncycastle.jce.spec.ECPrivateKeySpec;
-import org.bouncycastle.jce.spec.ECPublicKeySpec;
-import org.bouncycastle.math.ec.ECPoint;
-import org.bouncycastle.util.BigIntegers;
-import org.bouncycastle.util.encoders.Hex;
 
 import java.io.BufferedReader;
-import java.io.File;
-import java.io.FileOutputStream;
 import java.io.InputStream;
 import java.io.InputStreamReader;
-import java.io.OutputStream;
-import java.math.BigInteger;
 import java.nio.charset.StandardCharsets;
-import java.security.KeyFactory;
-import java.security.KeyPair;
-import java.security.KeyPairGenerator;
-import java.security.PrivateKey;
-import java.security.PublicKey;
-import java.security.SecureRandom;
-import java.security.Security;
-import java.security.Signature;
+import java.security.*;
 import java.security.spec.PKCS8EncodedKeySpec;
 import java.security.spec.X509EncodedKeySpec;
 import java.util.Base64;
@@ -159,32 +131,4 @@ public class SM2Util {
         pem.append("-----END PUBLIC KEY-----\n");
         return pem.toString();
     }
-    
-    public static byte[] sm3Digest(byte[] data) {
-        SM3Digest digest = new SM3Digest();
-        digest.update(data, 0, data.length);
-        byte[] result = new byte[digest.getDigestSize()];
-        digest.doFinal(result, 0);
-        return result;
-    }
-    
-    public static String sm3DigestHex(byte[] data) {
-        byte[] digest = sm3Digest(data);
-        return Hex.toHexString(digest);
-    }
-    
-    public static void writeFile(String filePath, byte[] content) throws Exception {
-        File file = new File(filePath);
-        File parentDir = file.getParentFile();
-        if (parentDir != null && !parentDir.exists()) {
-            parentDir.mkdirs();
-        }
-        try (OutputStream os = new FileOutputStream(file)) {
-            os.write(content);
-        }
-    }
-    
-    public static void writeFile(String filePath, String content) throws Exception {
-        writeFile(filePath, content.getBytes(StandardCharsets.UTF_8));
-    }
 }
diff --git a/device-fingerprint-tool/src/main/java/com/sunyard/cisd/SM3Util.java b/device-fingerprint-tool/src/main/java/com/sunyard/cisd/SM3Util.java
new file mode 100644
index 0000000..f34a283
--- /dev/null
+++ b/device-fingerprint-tool/src/main/java/com/sunyard/cisd/SM3Util.java
@@ -0,0 +1,40 @@
+package com.sunyard.cisd;
+
+import org.bouncycastle.crypto.digests.SM3Digest;
+import org.bouncycastle.util.encoders.Hex;
+
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.OutputStream;
+import java.nio.charset.StandardCharsets;
+
+public class SM3Util {
+    
+    public static byte[] sm3Digest(byte[] data) {
+        SM3Digest digest = new SM3Digest();
+        digest.update(data, 0, data.length);
+        byte[] result = new byte[digest.getDigestSize()];
+        digest.doFinal(result, 0);
+        return result;
+    }
+    
+    public static String sm3DigestHex(byte[] data) {
+        byte[] digest = sm3Digest(data);
+        return Hex.toHexString(digest);
+    }
+    
+    public static void writeFile(String filePath, byte[] content) throws Exception {
+        File file = new File(filePath);
+        File parentDir = file.getParentFile();
+        if (parentDir != null && !parentDir.exists()) {
+            parentDir.mkdirs();
+        }
+        try (OutputStream os = new FileOutputStream(file)) {
+            os.write(content);
+        }
+    }
+    
+    public static void writeFile(String filePath, String content) throws Exception {
+        writeFile(filePath, content.getBytes(StandardCharsets.UTF_8));
+    }
+}
diff --git a/device-fingerprint-tool/src/main/resources/sm2_private_key.pem b/device-fingerprint-tool/src/main/resources/sm2_private_key.pem
index c8e37f3..aaa01b8 100644
--- a/device-fingerprint-tool/src/main/resources/sm2_private_key.pem
+++ b/device-fingerprint-tool/src/main/resources/sm2_private_key.pem
@@ -1,6 +1,6 @@
 -----BEGIN PRIVATE KEY-----
-MIGTAgEAMBMGByqGSM49AgEGCCqBHM9VAYItBHkwdwIBAQQgWFBMLowcSO3Pn8tP
-KLszWBm/BSNPwSQvXErq1NiXkvqgCgYIKoEcz1UBgi2hRANCAARhkJ62bG2Gjg3h
-LE5fSlyaYxjFNKEyehbFUcHQSOPwRL9pDwUD5bnqpo3jNNlVYQnaKV0khg8gKlBU
-I3MM2oX4
+MIGTAgEAMBMGByqGSM49AgEGCCqBHM9VAYItBHkwdwIBAQQgyJA6u1jwC/MP+/K7
+ntiVLFB0XsldCIdY8Lift06UEaugCgYIKoEcz1UBgi2hRANCAAR7x0q/Bqj6JVwR
+mfjccNmJ5Wd8ZuDZZnPudWT1UupNtg9aNaEYHYa52xANhiu3IzOELmTtfs/QRMRe
+oabBvDAi
 -----END PRIVATE KEY-----
diff --git a/device-fingerprint-tool/src/main/resources/sm2_public_key.pem b/device-fingerprint-tool/src/main/resources/sm2_public_key.pem
index b40a46b..637abf7 100644
--- a/device-fingerprint-tool/src/main/resources/sm2_public_key.pem
+++ b/device-fingerprint-tool/src/main/resources/sm2_public_key.pem
@@ -1,4 +1,4 @@
 -----BEGIN PUBLIC KEY-----
-MFkwEwYHKoZIzj0CAQYIKoEcz1UBgi0DQgAEYZCetmxtho4N4SxOX0pcmmMYxTSh
-MnoWxVHB0Ejj8ES/aQ8FA+W56qaN4zTZVWEJ2ildJIYPICpQVCNzDNqF+A==
+MFkwEwYHKoZIzj0CAQYIKoEcz1UBgi0DQgAEe8dKvwao+iVcEZn43HDZieVnfGbg
+2WZz7nVk9VLqTbYPWjWhGB2GudsQDYYrtyMzhC5k7X7P0ETEXqGmwbwwIg==
 -----END PUBLIC KEY-----