fix:兼容go版本的sm2

src/main/java/minsecurity/crypto/sm2/SM2Base.java

@@ -177,5 +177,43 @@ public class SM2Base {
         return SM2KeyPair.generateKeyPair();
     }
 
+    /**
+     * SM2字节数组->16进制字节数组 辅助函数
+     * @param bytes byte[]
+     * @return byte[]
+     * @throws
+     * @author zhengqi wu
+     * @date 2021/4/12
+     **/
+    public static byte[] byteArraytoHexByteArray(byte[] bytes){
+        // 16进制表示法
+        StringBuilder sb = new StringBuilder();
+        for(int i=0;i < bytes.length;i++) {
+            sb.append(String.format("%02x", bytes[i]));
+        }
+        String hexStr = sb.toString();
+        return hexStr.getBytes();
+    }
 
+    /**
+     * 16进制字节数组->SM2字节数组 辅助函数
+     * @param bytes byte[]
+     * @return byte[]
+     * @throws
+     * @author zhengqi wu
+     * @date 2021/4/12
+     **/
+    public static byte[] hexByteArrayToByteArray(byte[] bytes){
+        String hex = new String(bytes);
+        if (hex.length() < 1) {
+            return null;
+        } else {
+            byte[] result = new byte[hex.length() / 2];
+            int j = 0;
+            for(int i = 0; i < hex.length(); i+=2) {
+                result[j++] = (byte)Integer.parseInt(hex.substring(i,i+2), 16);
+            }
+            return result;
+        }
+    }
 }