android解析p12证书中的私钥出错！

[smallsusu]

我用BC解析SM2的P12证书，对应的Java代码大致如下：

public KeyStore getKeyStore(String path, String cert_password)
	{
		KeyStore ks = null;
		try  
		{
            ks = KeyStore.getInstance("PKCS12", new org.bouncycastle.jce.provider.BouncyCastleProvider());  
             FileInputStream fis = new FileInputStream(new File(path));
            char[] nPassword = null;  
            if ((cert_password == null) || cert_password.trim().equals(""))  
                {  
                    nPassword = null;  
                }
            
            else  
                {  
            		nPassword = cert_password.toCharArray();  
                } 
            ks.load(fis, nPassword); 

            fis.close();  
            Enumeration enumm = ks.aliases();  
            String keyAlias = null;  
            if (enumm.hasMoreElements())  
            {  
                keyAlias = (String)enumm.nextElement();           
            }   
            ECPrivateKey prikey = (ECPrivateKey) ks.getKey(keyAlias, nPassword);
            BigInteger privateKey =  prikey.getD();
  //后续处理私钥的代码省略。
	}
		catch(Exception e)
		{
			e.getStackTrace();
		}
		
		return  ks;
	}

这个程序在Java上运行时能够解析我的SM2的P12私钥证书的.。但是我把相同的程序放入android程序中，运行就会报错。错误大致在Load（）方法那里，感觉是P12的输入流出错，但是我不知道为什么。下面是部分LogCat:
12-18 18:48:43.784: E/SpannableStringBuilder(21420): SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
12-18 18:48:48.793: W/IInputConnectionWrapper(21420): clearMetaKeyStates on inactive InputConnection
12-18 18:48:48.793: W/IInputConnectionWrapper(21420): setComposingText on inactive InputConnection
12-18 18:48:49.052: W/System.err(21420): java.io.IOException: error constructing MAC: java.security.InvalidAlgorithmParameterException: unknown parameter type.
12-18 18:48:49.052: W/System.err(21420): at org.bouncycastle.jcajce.provider.keystore.pkcs12.PKCS12KeyStoreSpi.engineLoad(Unknown Source)
12-18 18:48:49.052: W/System.err(21420): at java.security.KeyStore.load(KeyStore.java:590)。
请大神们帮我看看是为什么，是因为程序本身不对，还是说安卓有其他解析P12证书的程序?