fix:兼容go版本的sm2

src/main/java/minsecurity/crypto/sm2/SM2PrivateKey.java

@@ -54,7 +54,14 @@ public class SM2PrivateKey implements PrivateKeyInterface {
     
     @Override
     public byte[] getBytes() {
-        return privateKey.getD().toByteArray();
+        byte[] bytes = privateKey.getD().toByteArray();
+        // 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();
     }
 
     @Override
@@ -71,11 +78,19 @@ public class SM2PrivateKey implements PrivateKeyInterface {
      * @params d {byte[]}
      * @return boolean
      */
+    // TODO 实现不同
     public boolean setBytes(byte[] d){
-//        if (d.length != 64)
-//            return false;
-        String priStr = new String(d);
-        privateKey = new ECPrivateKeyParameters(new BigInteger(priStr, 16), SM2Base.DOMAIN_PARAMS);
+        if (d.length != 64 && d.length != 32 && d.length != 33)
+            return false;
+        switch (d.length){
+            case 32:
+                privateKey = new ECPrivateKeyParameters(new BigInteger(d), SM2Base.DOMAIN_PARAMS);
+                break;
+            case 64:
+                String priStr = new String(d);
+                privateKey = new ECPrivateKeyParameters(new BigInteger(priStr, 16), SM2Base.DOMAIN_PARAMS);
+                break;
+        }
         return true;
     }