fix:兼容go版本的sm2

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

@@ -12,6 +12,7 @@ import org.bouncycastle.crypto.signers.SM2Signer;
 
 import java.math.BigInteger;
 import java.security.SecureRandom;
+import java.util.Arrays;
 
 /*
  * @Author: hongyu guo
@@ -55,13 +56,7 @@ public class SM2PrivateKey implements PrivateKeyInterface {
     @Override
     public byte[] getBytes() {
         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();
+        return SM2Base.byteArraytoHexByteArray(bytes);
     }
 
     @Override
@@ -84,11 +79,12 @@ public class SM2PrivateKey implements PrivateKeyInterface {
             return false;
         switch (d.length){
             case 32:
+            case 33:
                 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);
+                d = SM2Base.hexByteArrayToByteArray(d);
+                privateKey = new ECPrivateKeyParameters(new BigInteger(d), SM2Base.DOMAIN_PARAMS);
                 break;
         }
         return true;