Java - 通过套接字发送证书

时间:2010-08-02 22:13:48

标签: java sockets certificate bouncycastle

我需要使用socket从服务器向客户端发送v3certificate。 去做这个: 服务器端,我生成一个我用base64.encode编码的证书,然后我发送给客户端。 客户端,我收到包含证书的字符串,

服务器代码:

 X509Certificate certificate = ...;
 sendAnswer(new String(certificate.getEncoded()));

public static void sendAnswer(String ans) {
    try {
        s.shutdownInput();
        PrintWriter output = new PrintWriter(s.getOutputStream(), true);
        output.println(new String(Base64.encode(ans.getBytes())));
        output.close();

    } catch (IOException ex) {
        Logger.getLogger(serverThread.class.getName()).log(Level.SEVERE, null, ex);
    }
}

客户端代码

 String value = sendMessage(..);//method which receive the certificate from the server

 InputStream inStream = null;
 X509Certificate cert=null;
 inStream = new ByteArrayInputStream(value.getBytes());
 CertificateFactory cf = CertificateFactory.getInstance("X.509","BC");
 cert = (X509Certificate)cf.generateCertificate(inStream);

public static String sendMessage(String url, int port, String tag, byte[] mex1) {

    Socket link;
    String reply = "";

    byte[] replyDec = null;

        link = new Socket(InetAddress.getByName(url), port);
        InputStream i = null;
        try {
            i = link.getInputStream();
        } catch (IOException ex) {
            Logger.getLogger(ClientApp.class.getName()).log(Level.SEVERE, null, ex);
        }
        Scanner input = new Scanner(i);

        while (input.hasNextLine()) {
            reply += input.nextLine();
        }
        replyDec = Base64.decode(reply);
        input.close();
        link.close();


    return new String(replyDec);
}

几乎一切正常,在客户端,如果我打印我收到的字符串,我会得到一个包含额外字符和证书数据的文本。但是在创建证书时,它给我一个错误,客户端。   这是错误:

java.security.cert.CertificateException: java.io.IOException: DER length more than 4 bytes: 111 at org.bouncycastle.jce.provider.JDKX509CertificateFactory.engineGenerateCertificate(Unknown Source) at java.security.cert.CertificateFactory.generateCertificate(CertificateFactory.java:322)

这是来自

的行
cert = (X509Certificate) cf.generateCertificate(inStream);

任何人都可以帮助我?

提前致谢

3 个答案:

答案 0 :(得分:2)

扔掉它并使用SSL,它已经完成了所有这些。

答案 1 :(得分:0)

您的问题可能是由于使用PrintWriter发送,以及可能有不同的内容(扫描程序)。您可以尝试使用StringWriter和StringReader在任一端匹配,然后您也可以调试,如果您发送的内容与您收到的内容完美匹配。

答案 2 :(得分:0)

您可以通过套接字按字节流发送证书:

配置socket后

在发送方:

ObjectOutputStream toServer;
toServer = new ObjectOutputStream(socket.getOutputStream());
byte[] frame = theCertificate.getEncoded();
toServer.writeObject(frame);
在配置socket之后

在接收方:

ObjectInputStream fromClient;
fromClient = new ObjectInputStream(socket.getInputStream());
byte[] cert = fromClient.readObject();
java.security.cert.Certificate jsCert = CertificateFactory.getInstance("X.509").generateCertificate(new ByteArrayInputStream(cert));

现在您可以使用此证书。例如,检索公钥:

PublicKey thepublicKey = jsCert.getPublicKey();