[英]Java - Sending certificate through socket
i need to send a v3certificate from the server to the client using socket. 我需要使用套接字从服务器向客户端发送v3证书。 To do this: server side, i generate a certificate which i encode with base64.encode , then i send it to the client.
为此:服务器端,我生成一个证书,并使用base64.encode进行编码,然后将其发送给客户端。 Client side, i receive the string which contain the certificate,
客户端,我收到包含证书的字符串,
Server code: 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);
}
}
Client code 客户代码
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);
}
Almost everything works, in the client side if i print the string i receive i get a text which contain extra character and the certificate data. 在客户端,如果我打印字符串,几乎所有的东西都可以工作,我会收到包含额外字符和证书数据的文本。 But it gives me an error when creating the certificate, client side.
但是在创建证书(客户端)时给了我一个错误。 This is the error:
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)
and this is the line from which it comes from 这就是它的来源
cert = (X509Certificate) cf.generateCertificate(inStream);
Anyone can help me? 有人可以帮帮我吗?
Thanks in advance 提前致谢
丢弃所有内容并使用SSL,SSL已经完成了所有工作。
You can send the certificate through socket by stream of bytes: 您可以按字节流通过套接字发送证书:
in sender side after configuration of socket: 配置套接字后,在发送方:
ObjectOutputStream toServer;
toServer = new ObjectOutputStream(socket.getOutputStream());
byte[] frame = theCertificate.getEncoded();
toServer.writeObject(frame);
in receiver side after configuration of socket: 配置插座后,在接收器侧:
ObjectInputStream fromClient;
fromClient = new ObjectInputStream(socket.getInputStream());
byte[] cert = fromClient.readObject();
java.security.cert.Certificate jsCert = CertificateFactory.getInstance("X.509").generateCertificate(new ByteArrayInputStream(cert));
now you can use this certificate. 现在您可以使用此证书。 for example as retrieving the public key:
例如,检索公共密钥:
PublicKey thepublicKey = jsCert.getPublicKey();
It looks possible that your problem might be due to using a PrintWriter to send, and possibly something different to read (scanner). 您的问题似乎可能是由于使用PrintWriter发送而造成的,并且可能与读取(扫描仪)不同。 You could try using a StringWriter and StringReader to have a match at either end and then also you can debug if what you send is a perfect match for what you receive.
您可以尝试使用StringWriter和StringReader在两端进行匹配,然后还可以调试发送的内容是否与接收的内容完全匹配。
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