ssl认证生成证书的代码 java

网上流行的 InstallCert.java，应该出自于官网。但现在也找不到了，只能找到2011年的一篇文章（在文章底下的参考链接）。

以下是生成证书的代码：

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.security.KeyStore;
import java.security.MessageDigest;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLException;
import javax.net.ssl.SSLSocket;
import javax.net.ssl.SSLSocketFactory;
import javax.net.ssl.TrustManager;
import javax.net.ssl.TrustManagerFactory;
import javax.net.ssl.X509TrustManager;/**** 编译InstallCert.java，然后执行：java InstallCert hostname，比如： java InstallCert* www.twitter.com 会看到如下信息：*/
public class InstallCert {public static void main(String[] args) throws Exception {String host;int port;char[] passphrase;host = "api.mch.weixin.qq.com";port = 443;String p = "changeit";passphrase = p.toCharArray();File file = new File("jssecacerts");if (file.isFile() == false) {char SEP = File.separatorChar;File dir = new File(System.getProperty("java.home") + SEP + "lib" + SEP + "security");file = new File(dir, "jssecacerts");if (file.isFile() == false) {file = new File(dir, "cacerts");}}System.out.println("Loading KeyStore " + file + "...");InputStream in = new FileInputStream(file);KeyStore ks = KeyStore.getInstance(KeyStore.getDefaultType());ks.load(in, passphrase);in.close();SSLContext context = SSLContext.getInstance("TLS");TrustManagerFactory tmf = TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm());tmf.init(ks);X509TrustManager defaultTrustManager = (X509TrustManager) tmf.getTrustManagers()[0];SavingTrustManager tm = new SavingTrustManager(defaultTrustManager);context.init(null, new TrustManager[]{tm}, null);SSLSocketFactory factory = context.getSocketFactory();System.out.println("Opening connection to " + host + ":" + port + "...");SSLSocket socket = (SSLSocket) factory.createSocket(host, port);socket.setSoTimeout(10000);try {System.out.println("Starting SSL handshake...");socket.startHandshake();socket.close();System.out.println();System.out.println("No errors, certificate is already trusted");} catch (SSLException e) {System.out.println();e.printStackTrace(System.out);}X509Certificate[] chain = tm.chain;if (chain == null) {System.out.println("Could not obtain server certificate chain");return;}BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));System.out.println();System.out.println("Server sent " + chain.length + " certificate(s):");System.out.println();MessageDigest sha1 = MessageDigest.getInstance("SHA1");MessageDigest md5 = MessageDigest.getInstance("MD5");for (int i = 0; i < chain.length; i++) {X509Certificate cert = chain[i];System.out.println(" " + (i + 1) + " Subject " + cert.getSubjectDN());System.out.println("   Issuer  " + cert.getIssuerDN());sha1.update(cert.getEncoded());System.out.println("   sha1    " + toHexString(sha1.digest()));md5.update(cert.getEncoded());System.out.println("   md5     " + toHexString(md5.digest()));System.out.println();}System.out.println("Enter certificate to add to trusted keystore or 'q' to quit: [1]");String line = reader.readLine().trim();int k;try {k = (line.length() == 0) ? 0 : Integer.parseInt(line) - 1;} catch (NumberFormatException e) {System.out.println("KeyStore not changed");return;}X509Certificate cert = chain[k];String alias = host + "-" + (k + 1);ks.setCertificateEntry(alias, cert);File outFile = new File("jssecacerts");OutputStream out = new FileOutputStream(outFile);System.out.println(out);ks.store(out, passphrase);out.close();System.out.println();System.out.println(cert);System.out.println();System.out.println("Added certificate to keystore 'jssecacerts' using alias '" + alias + "'");System.out.println();System.out.println("file:" + outFile.getAbsolutePath());}private static final char[] HEXDIGITS = "0123456789abcdef".toCharArray();private static String toHexString(byte[] bytes) {StringBuilder sb = new StringBuilder(bytes.length * 3);for (int b : bytes) {b &= 0xff;sb.append(HEXDIGITS[b >> 4]);sb.append(HEXDIGITS[b & 15]);sb.append(' ');}return sb.toString();}private static class SavingTrustManager implements X509TrustManager {private final X509TrustManager tm;private X509Certificate[] chain;SavingTrustManager(X509TrustManager tm) {this.tm = tm;}public X509Certificate[] getAcceptedIssuers() {throw new UnsupportedOperationException();}public void checkClientTrusted(X509Certificate[] chain, String authType) throws CertificateException {throw new UnsupportedOperationException();}public void checkServerTrusted(X509Certificate[] chain, String authType) throws CertificateException {this.chain = chain;tm.checkServerTrusted(chain, authType);}}}

从此再不为https异常"PKIX path building failed"烦恼-CSDN博客

解决 sun.security.validator.ValidatorException: PKIX path building failed 的问题-CSDN博客

解决 sun.security.validator.ValidatorException: PKIX path building failed:-CSDN博客

PKIX path building failed的问题 - OSCHINA - 中文开源技术交流社区 2011年文章

=====================文章到此已经结束，以下是紫薯布丁=========================

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.security.KeyStore;
import java.security.MessageDigest;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;

import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLException;
import javax.net.ssl.SSLSocket;
import javax.net.ssl.SSLSocketFactory;
import javax.net.ssl.TrustManager;
import javax.net.ssl.TrustManagerFactory;
import javax.net.ssl.X509TrustManager;

/**
*
* 编译InstallCert.java，然后执行：java InstallCert hostname，比如： java InstallCert
* www.twitter.com 会看到如下信息：
*/
public class InstallCert {

   public static void main(String[] args) throws Exception {
       String host;
       int port;
       char[] passphrase;

       host = "api.mch.weixin.qq.com";
       port = 443;
       String p = "changeit";
       passphrase = p.toCharArray();

       File file = new File("jssecacerts");
       if (file.isFile() == false) {
           char SEP = File.separatorChar;
           File dir = new File(System.getProperty("java.home") + SEP + "lib" + SEP + "security");
           file = new File(dir, "jssecacerts");
           if (file.isFile() == false) {
               file = new File(dir, "cacerts");
           }
       }
       System.out.println("Loading KeyStore " + file + "...");
       InputStream in = new FileInputStream(file);
       KeyStore ks = KeyStore.getInstance(KeyStore.getDefaultType());
       ks.load(in, passphrase);
       in.close();

       SSLContext context = SSLContext.getInstance("TLS");
       TrustManagerFactory tmf = TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm());
       tmf.init(ks);
       X509TrustManager defaultTrustManager = (X509TrustManager) tmf.getTrustManagers()[0];
       SavingTrustManager tm = new SavingTrustManager(defaultTrustManager);
       context.init(null, new TrustManager[]{tm}, null);
       SSLSocketFactory factory = context.getSocketFactory();

       System.out.println("Opening connection to " + host + ":" + port + "...");
       SSLSocket socket = (SSLSocket) factory.createSocket(host, port);
       socket.setSoTimeout(10000);
       try {
           System.out.println("Starting SSL handshake...");
           socket.startHandshake();
           socket.close();
           System.out.println();
           System.out.println("No errors, certificate is already trusted");
       } catch (SSLException e) {
           System.out.println();
           e.printStackTrace(System.out);
       }

       X509Certificate[] chain = tm.chain;
       if (chain == null) {
           System.out.println("Could not obtain server certificate chain");
           return;
       }

BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));

       System.out.println();
       System.out.println("Server sent " + chain.length + " certificate(s):");
       System.out.println();
       MessageDigest sha1 = MessageDigest.getInstance("SHA1");
       MessageDigest md5 = MessageDigest.getInstance("MD5");
       for (int i = 0; i < chain.length; i++) {
           X509Certificate cert = chain[i];
           System.out.println(" " + (i + 1) + " Subject " + cert.getSubjectDN());
           System.out.println(" Issuer " + cert.getIssuerDN());
           sha1.update(cert.getEncoded());
           System.out.println(" sha1 " + toHexString(sha1.digest()));
           md5.update(cert.getEncoded());
           System.out.println(" md5 " + toHexString(md5.digest()));
           System.out.println();
       }

       System.out.println("Enter certificate to add to trusted keystore or 'q' to quit: [1]");
       String line = reader.readLine().trim();
       int k;
       try {
           k = (line.length() == 0) ? 0 : Integer.parseInt(line) - 1;
       } catch (NumberFormatException e) {
           System.out.println("KeyStore not changed");
           return;
       }

       X509Certificate cert = chain[k];
       String alias = host + "-" + (k + 1);
       ks.setCertificateEntry(alias, cert);

       File outFile = new File("jssecacerts");
       OutputStream out = new FileOutputStream(outFile);
       System.out.println(out);
       ks.store(out, passphrase);
       out.close();

       System.out.println();
       System.out.println(cert);
       System.out.println();
       System.out.println("Added certificate to keystore 'jssecacerts' using alias '" + alias + "'");
       System.out.println();
       System.out.println("file:" + outFile.getAbsolutePath());
   }

private static final char[] HEXDIGITS = "0123456789abcdef".toCharArray();

   private static String toHexString(byte[] bytes) {
       StringBuilder sb = new StringBuilder(bytes.length * 3);
       for (int b : bytes) {
           b &= 0xff;
           sb.append(HEXDIGITS[b >> 4]);
           sb.append(HEXDIGITS[b & 15]);
           sb.append(' ');
       }
       return sb.toString();
   }

private static class SavingTrustManager implements X509TrustManager {

private final X509TrustManager tm;
private X509Certificate[] chain;

       SavingTrustManager(X509TrustManager tm) {
           this.tm = tm;
       }

       public X509Certificate[] getAcceptedIssuers() {
           throw new UnsupportedOperationException();
       }

       public void checkClientTrusted(X509Certificate[] chain, String authType) throws CertificateException {
           throw new UnsupportedOperationException();
       }

       public void checkServerTrusted(X509Certificate[] chain, String authType) throws CertificateException {
           this.chain = chain;
           tm.checkServerTrusted(chain, authType);
       }
   }

}