更新了BC_SM4，以支持安卓调用SM4

src/main/java/VMSConnection/Security/SM4/BC_SM4.java

@@ -16,7 +16,15 @@ import java.security.*;
  */
 public class BC_SM4 {
     static {
-        Security.addProvider(new BouncyCastleProvider());
+        // 加载类的时候执行的静态代码块。只执行一次。
+        // 参考博文：https://www.cnblogs.com/cherrylv/p/10688487.html
+        // 这么做是为了解决安卓不能使用正确版本的BC的问题
+        System.out.println("run static code block");
+        Security.removeProvider(BouncyCastleProvider.PROVIDER_NAME);
+        if (Security.getProvider(BouncyCastleProvider.PROVIDER_NAME) == null) {
+            System.out.println("runtime has no BouncyCastleProvider");
+            Security.addProvider(new BouncyCastleProvider());
+        }
     }
     public static final String ALGORITHM_NAME = "SM4";
     public static final String ALGORITHM_NAME_ECB_PADDING = "SM4/ECB/PKCS5Padding";

src/test/java/VMSConnection/TestAPI.java

@@ -34,8 +34,8 @@ public class TestAPI {
 //        System.out.println(res);
 //    }
     public static void main(String[] args){
-        String username="/freexshka2";
-        String email="25fjsygqnshkhk3s@163.com";
+        String username="/frasgASJGXUa2";
+        String email="25SAUUKDsiahHk3s@163.com";
         int userID=1;
         // 模拟客户端生成自己的公钥私钥
         BC_KeyManager bc_keyManager=new BC_KeyManager();