Exception （Javacard）如何知道错误的原因？

我不明白为什么会出现SW（6300）。（objRSAKeyPair.genKeyPair（）；）

我正在实现密钥大小为2048位的RSA密码。 在1024位的情况下，没有问题。 但是，在2048位的情况下，卡输出SW 6300

因为我想知道确切的原因， 我实现了下面输出详细原因的异常代码

    private RSAPrivateCrtKey    objRSAPriKey=null;
    private RSAPublicKey    objRSAPubKey=null;
    private KeyPair     objRSAKeyPair=null;
    private Signature       objRSASign=null;

    ...

public static void install(byte[] bArray, short bOffset, byte bLength){
    new AAA(bArray, bOffset, bLength);
}

private AAA(byte bArray[], short bOffset, byte bLength){    

    // Create RSA Keys and Pair
    objRSAPriKey = (RSAPrivateCrtKey)KeyBuilder.buildKey(KeyBuilder.TYPE_RSA_CRT_PRIVATE, KeyBuilder.LENGTH_RSA_2048, false);
    objRSAPubKey = (RSAPublicKey)KeyBuilder.buildKey(KeyBuilder.TYPE_RSA_PUBLIC,  KeyBuilder.LENGTH_RSA_2048, false);
    objRSAKeyPair= new KeyPair(KeyPair.ALG_RSA_CRT, KeyBuilder.LENGTH_RSA_2048);        

    try {
        objRSAKeyPair.genKeyPair(); // [[[ Error Position ]]]
    }
    catch(CryptoException c)
    {    
        short reason = c.getReason();   
        ISOException.throwIt(reason);       
    }

    // Create Signature Object
    objRSASign = Signature.getInstance(Signature.ALG_RSA_SHA_PKCS1, false);

    register();     
}

但该卡仍然输出6300，而不是原因码。 也许JCRE会输出错误6300

我不明白为什么JCRE输出SW 6300，这意味着基于GPSpec的“主机密码验证失败”。 错误代码部分正在生成RSA的密钥对，而不是身份验证

<我的问题>

如何知道细节原因。（我不确定异常代码是否正确 （部分）

如果该卡不支持RSA 2048位，我希望 由于捕获代码部分，卡将输出“0003”。但我不能 了解SW 6300

有人能成为我的英雄吗？ 先谢谢你

---

我改了密码。（我的完整代码见下文） 我遵循了您的注释，因此我将代码部分移到了process（）。 但它仍然输出SW 6300。 请分享您宝贵的知识和经验

package Test;

import javacard.framework.*;
import javacard.security.*;
import javacardx.crypto.*;

public class Test extends Applet{

private RSAPrivateCrtKey    objRSAPriKey=null;      // Object for RSA Private Key
private RSAPublicKey            objRSAPubKey=null;      // Object for RSA Public Key
private KeyPair                     objRSAKeyPair=null;     // Object for RSA Key Pair
private Signature               objRSASign=null;            // Object for RSA Signature

public static void install(byte[] bArray, short bOffset, byte bLength){
    new Test(bArray, bOffset, bLength);
}

private Test(byte bArray[], short bOffset, byte bLength){   

    // Create RSA Keys and Pair
    objRSAPriKey = (RSAPrivateCrtKey)KeyBuilder.buildKey(KeyBuilder.TYPE_RSA_CRT_PRIVATE, KeyBuilder.LENGTH_RSA_2048, false);
    objRSAPubKey = (RSAPublicKey)KeyBuilder.buildKey(KeyBuilder.TYPE_RSA_PUBLIC,  KeyBuilder.LENGTH_RSA_2048, false);
    objRSAKeyPair= new KeyPair(KeyPair.ALG_RSA_CRT, KeyBuilder.LENGTH_RSA_2048);        

    objRSASign = Signature.getInstance(Signature.ALG_RSA_SHA_PKCS1, false);

    register();
}

public void process(APDU apdu){
    byte buf[] = apdu.getBuffer();

    try {
        objRSAKeyPair.genKeyPair();     // [[[ Error Position ]]]
        ISOException.throwIt((short)0x9999);        // for check
    }
    catch(CryptoException c)
    {    
        //this line will give you the reason of problem 
        short reason = c.getReason();   
        ISOException.throwIt(reason);       // for check
    }
    finally 
    {
        ISOException.throwIt((short)0x8888);        // for check
    }

    return; 
}

}

---

这是APDU命令/响应

1。（2048位）小程序安装阶段

2。案例2

西南：8888

public void process(APDU apdu){
    byte buf[] = apdu.getBuffer();

  try {

      // Case 1
      ISOException.throwIt((short)0x6300);      // for check
      ISOException.throwIt((short)0x5555);      // for check
      objRSAKeyPair.genKeyPair();

      ISOException.throwIt((short)0x9999);      // for check
  }
  catch(CryptoException c)
  {    
      //this line will give you the reason of problem 
      short reason = c.getReason();   
      ISOException.throwIt(reason);     // for check
  }
  catch(ISOException c)
  {    
      ISOException.throwIt((short)0x6666);      // for check
  }
  finally 
  {
      ISOException.throwIt((short)0x8888);      // for check
  }
  ISOException.throwIt((short)0x7777);      // for check

  return;   
}

public void process(APDU apdu){
    byte buf[] = apdu.getBuffer();

  try {

      // Case 2
      //ISOException.throwIt((short)0x6300);        // for check
      ISOException.throwIt((short)0x5555);      // for check
      objRSAKeyPair.genKeyPair();


      ISOException.throwIt((short)0x9999);      // for check
  }
  catch(CryptoException c)
  {    
      //this line will give you the reason of problem 
      short reason = c.getReason();   
      ISOException.throwIt(reason);     // for check
  }
  catch(ISOException c)
  {    
      ISOException.throwIt((short)0x6666);      // for check
  }
  finally 
  {
      ISOException.throwIt((short)0x8888);      // for check
  }
  ISOException.throwIt((short)0x7777);      // for check

  return;   
}

3。案例3

西南：6300

public void process(APDU apdu){
    byte buf[] = apdu.getBuffer();

  try {

      // Case 3
      //ISOException.throwIt((short)0x6300);        // for check
      //ISOException.throwIt((short)0x5555);        // for check
      objRSAKeyPair.genKeyPair();

      ISOException.throwIt((short)0x9999);      // for check
  }
  catch(CryptoException c)
  {    
      //this line will give you the reason of problem 
      short reason = c.getReason();   
      ISOException.throwIt(reason);     // for check
  }
  catch(ISOException c)
  {    
      ISOException.throwIt((short)0x6666);      // for check
  }
  finally 
  {
      ISOException.throwIt((short)0x8888);      // for check
  }
  ISOException.throwIt((short)0x7777);      // for check

  return;   
}

---

请将您的代码移动到process（..）方法并尝试选择applet…，然后您将获得正确的原因代码。它在构造函数中不工作的原因可能是因为它不允许在register（）之前抛出任何异常……但我不确定。小程序选择命令00 A4 04 00 XX AID XX-小程序AIDYep的长度，通常

ISOException

状态字不会由

install

返回。接得好，@AnuragSharma。就我而言，也是一样的。我补充了上面的完整代码。@user2642459我怀疑6300个状态字来自外部身份验证失败，而试图访问安装小程序或卡管理器PIN验证是错误的。这意味着您的小程序尚未安装。若要进行更多调查，请同时共享您的日志。@user2642459请在评论中使用@向我推荐，以便我收到通知以帮助您更快地完成工作。谢谢：）

[ Connecting a Card in Terminal(ACS ACR122U PICC Interface 0) ]
- ATR(S) = 3B8E8001107880B0020031C0641F270100FF06
*** A Card is connected successfully

[  Card  ] <==  00A4040007D4106509900090
[  Card  ] ==>  8888                        // finally() { ... }

public void process(APDU apdu){
    byte buf[] = apdu.getBuffer();

  try {

      // Case 1
      ISOException.throwIt((short)0x6300);      // for check
      ISOException.throwIt((short)0x5555);      // for check
      objRSAKeyPair.genKeyPair();

      ISOException.throwIt((short)0x9999);      // for check
  }
  catch(CryptoException c)
  {    
      //this line will give you the reason of problem 
      short reason = c.getReason();   
      ISOException.throwIt(reason);     // for check
  }
  catch(ISOException c)
  {    
      ISOException.throwIt((short)0x6666);      // for check
  }
  finally 
  {
      ISOException.throwIt((short)0x8888);      // for check
  }
  ISOException.throwIt((short)0x7777);      // for check

  return;   
}

public void process(APDU apdu){
    byte buf[] = apdu.getBuffer();

  try {

      // Case 2
      //ISOException.throwIt((short)0x6300);        // for check
      ISOException.throwIt((short)0x5555);      // for check
      objRSAKeyPair.genKeyPair();


      ISOException.throwIt((short)0x9999);      // for check
  }
  catch(CryptoException c)
  {    
      //this line will give you the reason of problem 
      short reason = c.getReason();   
      ISOException.throwIt(reason);     // for check
  }
  catch(ISOException c)
  {    
      ISOException.throwIt((short)0x6666);      // for check
  }
  finally 
  {
      ISOException.throwIt((short)0x8888);      // for check
  }
  ISOException.throwIt((short)0x7777);      // for check

  return;   
}

public void process(APDU apdu){
    byte buf[] = apdu.getBuffer();

  try {

      // Case 3
      //ISOException.throwIt((short)0x6300);        // for check
      //ISOException.throwIt((short)0x5555);        // for check
      objRSAKeyPair.genKeyPair();

      ISOException.throwIt((short)0x9999);      // for check
  }
  catch(CryptoException c)
  {    
      //this line will give you the reason of problem 
      short reason = c.getReason();   
      ISOException.throwIt(reason);     // for check
  }
  catch(ISOException c)
  {    
      ISOException.throwIt((short)0x6666);      // for check
  }
  finally 
  {
      ISOException.throwIt((short)0x8888);      // for check
  }
  ISOException.throwIt((short)0x7777);      // for check

  return;   
}