Question

我有生成密钥对的Java代码，如下所示：

KeyPairGenerator keyGen = KeyPairGenerator.getInstance("RSA");
keyGen.initialize(1024);
KeyPair key = keyGen.generateKeyPair();
PrivateKey priv = key.getPrivate();
PublicKey pub = key.getPublic();

现在我想在j2me中使用BC做同样的事情。我从Bouncy castle latest release下载了最新的充气城堡图书馆。

我想在j2me中做同样的事情。下面是我为j2me生成公钥和私钥的代码：

 RSAKeyPairGenerator generator = new RSAKeyPairGenerator();
     generator.init(new RSAKeyGenerationParameters(new BigInteger("10001", 16),//publicExponent
            SecureRandom.getInstance("SHA1PRNG"),
            1024,
            80
            ));
    AsymmetricCipherKeyPair keyPair = generator.generateKeyPair();

    AsymmetricKeyParameter myprivatekey = (AsymmetricKeyParameter) keyPair.getPrivate();
    AsymmetricKeyParameter mypublickey = (AsymmetricKeyParameter) keyPair.getPublic();

现在我想获取公钥和私钥的字节数组，但是没有这样的方法直接从AsymmetricKeyParameter类获取编码字节。通过谷歌搜索我发现下面的解决方案从AsymmetricKeyParameter获取字节。

   PrivateKeyInfo   pkInfo = PrivateKeyInfoFactory.createPrivateKeyInfo(myprivatekey);
   byte[] privateKey = pkInfo.getEncoded();

此代码应该可以正常工作，但不幸的是我的netbeans显示java.lang.Error：ClassFormatError：当我运行此代码时。

请帮助我如何解决此错误或让我知道任何其他替代方法，我可以从AsymmetricCipherKeyPair获取字节，因为我想使用套接字连接将此密钥发送到我的服务器。使用Netbeans 6.9.1和j2ME SDK 3.0.5来构建我的j2me应用程序。

任何帮助都会得到满足。感谢

这是我的完整midlet代码。

import java.io.IOException;
import java.math.BigInteger;
import java.security.SecureRandom;

import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Form;
import javax.microedition.midlet.*;
import org.bouncycastle.asn1.pkcs.PrivateKeyInfo;
import org.bouncycastle.crypto.AsymmetricCipherKeyPair;
import org.bouncycastle.crypto.generators.RSAKeyPairGenerator;
import org.bouncycastle.crypto.params.AsymmetricKeyParameter;
import org.bouncycastle.crypto.params.RSAKeyGenerationParameters;
import org.bouncycastle.crypto.util.PrivateKeyInfoFactory;

/**
 * @author nirav.bhandari
 */
public class RSAClientMidlet extends MIDlet implements CommandListener {

    public void startApp() {

        Form f = new Form("Test");
        Command cmd = new Command("Exit", Command.EXIT, 1);
        f.addCommand(cmd);

        f.setCommandListener(this);
        Display d = Display.getDisplay(this);
        d.setCurrent(f);

        RSAKeyPairGenerator generator = new RSAKeyPairGenerator();
        generator.init(new RSAKeyGenerationParameters(new BigInteger("10001", 16),//publicExponent
                SecureRandom.getInstance("SHA1PRNG"),
                1024,
                80));
        AsymmetricCipherKeyPair keyPair = generator.generateKeyPair();

        AsymmetricKeyParameter myprivatekey = (AsymmetricKeyParameter) keyPair.getPrivate();
        AsymmetricKeyParameter mypublickey = (AsymmetricKeyParameter) keyPair.getPublic();
        System.out.println("Done");
        PrivateKeyInfo pkInfo;

        try {

           pkInfo = PrivateKeyInfoFactory.createPrivateKeyInfo(myprivatekey);
           // i get classformat error here. un
           byte[] privateKey = pkInfo.getEncoded();
  SubjectPublicKeyInfo publicKeyInfo = SubjectPublicKeyInfoFactory.createSubjectPublicKeyInfo(mypublickey);

        } catch (IOException ex) {
            ex.printStackTrace();
        }

    }

    public void pauseApp() {
    }

    public void destroyApp(boolean unconditional) {
        notifyDestroyed();
    }

    public void commandAction(Command c, Displayable d) {
        destroyApp(true);
    }

    private void show(String string) {
        System.out.println(string);
    }
}

这是我的错误的错误跟踪

    TRACE: <at java.lang.Error: ClassFormatError:  78>, startApp threw an Exception
java.lang.Error: ClassFormatError:  78
        at RSAClientMidlet.startApp(), bci=123
        at javax.microedition.midlet.MIDletTunnelImpl.callStartApp(), bci=1
        at com.sun.midp.midlet.MIDletPeer.startApp(), bci=7
        at com.sun.midp.midlet.MIDletStateHandler.startSuite(), bci=273
        at com.sun.midp.main.AbstractMIDletSuiteLoader.startSuite(), bci=52
        at com.sun.midp.main.CldcMIDletSuiteLoader.startSuite(), bci=8
        at com.sun.midp.main.AbstractMIDletSuiteLoader.runMIDletSuite(), bci=161
        at com.sun.midp.main.AppIsolateMIDletSuiteLoader.main(), bci=26
java.lang.Error: ClassFormatError:  78
        at RSAClientMidlet.startApp(), bci=123
        at javax.microedition.midlet.MIDletTunnelImpl.callStartApp(), bci=1
        at com.sun.midp.midlet.MIDletPeer.startApp(), bci=7
        at com.sun.midp.midlet.MIDletStateHandler.startSuite(), bci=273
        at com.sun.midp.main.AbstractMIDletSuiteLoader.startSuite(), bci=52
        at com.sun.midp.main.CldcMIDletSuiteLoader.startSuite(), bci=8
        at com.sun.midp.main.AbstractMIDletSuiteLoader.runMIDletSuite(), bci=161
        at com.sun.midp.main.AppIsolateMIDletSuiteLoader.main(), bci=26
javacall_lifecycle_state_changed() lifecycle: event is JAVACALL_LIFECYCLE_MIDLET_SHUTDOWN status is JAVACALL_OK

在j2me中使用充气城堡生成Keypair

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