add key generotor tool

settings.gradle

@@ -128,3 +128,7 @@ project(":wedpr-components-service-publish").projectDir=file("wedpr-components/s
 
 include ":wedpr-components-service-sdk-pir"
 project(":wedpr-components-service-sdk-pir").projectDir=file("wedpr-components/service-sdk/pir")
+
+include ':wedpr-components-key-generator'
+project(':wedpr-components-key-generator').projectDir=file("wedpr-components/key-generator")
+

wedpr-components/key-generator/build.gradle

@@ -0,0 +1,10 @@
+// Apply the java-library plugin to add support for Java Library
+plugins {
+    id 'org.springframework.boot' version '2.3.12.RELEASE'
+    id 'io.spring.dependency-management' version '1.0.11.RELEASE'
+    id 'java'
+}
+
+dependencies {
+    implementation project(":wedpr-components-blockchain")
+}

wedpr-components/key-generator/src/main/java/com/webank/wedpr/KeyGeneratorMain.java

@@ -0,0 +1,60 @@
+package com.webank.wedpr;
+
+import java.security.SecureRandom;
+import org.fisco.bcos.sdk.v3.crypto.CryptoSuite;
+import org.fisco.bcos.sdk.v3.crypto.keypair.CryptoKeyPair;
+import org.fisco.bcos.sdk.v3.model.CryptoType;
+
+public class KeyGeneratorMain {
+    public static void main(String[] args) {
+        generateECDSAKey();
+        generateSM2Key();
+        generateSymmetricKey();
+    }
+
+    private static void generateECDSAKey() {
+        CryptoSuite ecdsaCryptoSuite = new CryptoSuite(CryptoType.ECDSA_TYPE);
+        CryptoKeyPair ecdsaCryptoKeyPair = ecdsaCryptoSuite.getCryptoKeyPair();
+        String ecdsaHexPrivateKey = ecdsaCryptoKeyPair.getHexPrivateKey();
+        String ecdsaHexPublicKey = ecdsaCryptoKeyPair.getHexPublicKey();
+        System.out.println("ECDSA account is randomly generated as below:");
+        System.out.println("ecdsa_private_key:" + ecdsaHexPrivateKey);
+        System.out.println("ecdsa_public_key:" + ecdsaHexPublicKey);
+    }
+
+    private static void generateSM2Key() {
+        CryptoSuite sm2CryptoSuite = new CryptoSuite(CryptoType.SM_TYPE);
+        CryptoKeyPair sm2cryptoKeyPair = sm2CryptoSuite.getCryptoKeyPair();
+        String sm2HexPrivateKey = sm2cryptoKeyPair.getHexPrivateKey();
+        String sm2HexPublicKey = sm2cryptoKeyPair.getHexPublicKey();
+        System.out.println();
+        System.out.println("SM2 account is randomly generated as below:");
+        System.out.println("sm2_private_key:" + sm2HexPrivateKey);
+        System.out.println("sm2_public_key:" + sm2HexPublicKey);
+    }
+
+    private static void generateSymmetricKey() {
+        SecureRandom random = new SecureRandom();
+        byte[] bytes1 = new byte[16];
+        byte[] bytes2 = new byte[32];
+        random.nextBytes(bytes1);
+        random.nextBytes(bytes2);
+        String hexSymmetricKey1 = bytesToHex(bytes1);
+        String hexSymmetricKey2 = bytesToHex(bytes2);
+        System.out.println();
+        System.out.println("symmetric_key(16 bytes):" + hexSymmetricKey1);
+        System.out.println("symmetric_key(32 bytes):" + hexSymmetricKey2);
+    }
+
+    public static String bytesToHex(byte[] bytes) {
+        StringBuilder hexString = new StringBuilder();
+        for (byte b : bytes) {
+            String hex = Integer.toHexString(0xff & b);
+            if (hex.length() == 1) {
+                hexString.append('0');
+            }
+            hexString.append(hex);
+        }
+        return hexString.toString();
+    }
+}