小编Bri*_*tto的帖子

我正在尝试使用pyopenssl生成ac自签名X509v3 CA证书.我想要添加扩展权限密钥标识符(AKID)与包含主题密钥标识符(SKID)的keyid.

但我的以下代码块不会将SKID复制到AKID而是抛出异常.

代码如下

import OpenSSL

key = OpenSSL.crypto.PKey()
key.generate_key(OpenSSL.crypto.TYPE_RSA, 2048)

ca = OpenSSL.crypto.X509()
ca.set_version(2)
ca.set_serial_number(1)
ca.get_subject().CN = "ca.example.com"
ca.gmtime_adj_notBefore(0)
ca.gmtime_adj_notAfter(24 * 60 * 60)
ca.set_issuer(ca.get_subject())
ca.set_pubkey(key)
ca.add_extensions([
  OpenSSL.crypto.X509Extension("basicConstraints", True,
                               "CA:TRUE, pathlen:0"),
  OpenSSL.crypto.X509Extension("keyUsage", True,
                               "keyCertSign, cRLSign"),
  OpenSSL.crypto.X509Extension("subjectKeyIdentifier", False, "hash",
                               subject=ca),
  OpenSSL.crypto.X509Extension("authorityKeyIdentifier", False, "keyid:always",issuer=ca)
  ])
ca.sign(key, "sha1")
open("MyCertificate.crt.bin", "wb").write(
            OpenSSL.crypto.dump_certificate(OpenSSL.crypto.FILETYPE_ASN1, ca))

抛出的异常如下

Traceback (most recent call last):
  File "C:\Documents and Settings\Administrator\Desktop\Certificate\certi.py", line 21, in <module>
    OpenSSL.crypto.X509Extension("authorityKeyIdentifier", False, "keyid:always",issuer=ca)
Error: [('X509 V3 routines', 'V2I_AUTHORITY_KEYID', 'unable to get issuer keyid'), ('X509 V3 routines', …

我正在编写一个Android USB主机应用程序,我试图枚举与平板电脑连接的设备.我按照开发人员站点中的android USB主机文档中的代码进行操作.

我的代码如下

AndroidUSBActivity

public class AndroidUSBActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    USBClass usb = new USBClass();
    ArrayList<String> deviceList = usb.GetUSBDevices(getBaseContext());
    final CharSequence[] items = deviceList.toArray(new CharSequence[deviceList.size()]);

    AlertDialog.Builder builder = new AlertDialog.Builder(this);
    builder.setTitle("Select a Reader");
    builder.setSingleChoiceItems(items, -1, new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int item) {
            String selectedDevice = (String) items[item];
            dialog.dismiss();

            TextView DeivceName = (TextView)findViewById(R.id.textView1);
            DeivceName.setText(selectedDevice);
        }
    });
    AlertDialog alert = builder.create(); …

我有一个javacard,它安装了2个小程序.现在我想从两者中选择一个.目前我的工作方式是,我提供applet的cap文件,我从中得到它的AID.但我发现这种方法并不令人满意.所以

1. 是否有一种方法可以在没有封面文件的情况下获得安装在Java卡中的applet的AID？
2. 有没有办法选择没有AID的applet？我的意思是,有一种方法可以在重置后自动选择applet吗？
3. 对此有任何其他想法或见解吗？