[java] view plain copy 在CODE上查看代码片派生到我的代码片

import java.io.File;

import java.io.FileInputStream;

import java.io.FileWriter;

import java.security.Key;

import java.security.KeyPair;

import java.security.KeyStore;

import java.security.KeyStoreException;

import java.security.NoSuchAlgorithmException;

import java.security.PrivateKey;

import java.security.PublicKey;

import java.security.UnrecoverableKeyException;

import java.security.cert.Certificate;

import sun.misc.*;

public class ExportPrivateKey {

private File keystoreFile;

private String keyStoreType;

private char[] password;

private String alias;

private File exportedFile;

public static KeyPair getPrivateKey(KeyStore keystore, String alias, char[] password) {

try {

Key key=keystore.getKey(alias,password);

if(key instanceof PrivateKey) {

Certificate cert=keystore.getCertificate(alias);

PublicKey publicKey=cert.getPublicKey();

return new KeyPair(publicKey,(PrivateKey)key);

}

} catch (UnrecoverableKeyException e) {

} catch (NoSuchAlgorithmException e) {

} catch (KeyStoreException e) {

}

return null;

}

public void export() throws Exception{

KeyStore keystore=KeyStore.getInstance(keyStoreType);

BASE64Encoder encoder=new BASE64Encoder();

keystore.load(new FileInputStream(keystoreFile),password);

KeyPair keyPair=getPrivateKey(keystore,alias,password);

PrivateKey privateKey=keyPair.getPrivate();

String encoded=encoder.encode(privateKey.getEncoded());

FileWriter fw=new FileWriter(exportedFile);

fw.write(“—–BEGIN PRIVATE KEY—–\n”);

fw.write(encoded);

fw.write(“\n”);

fw.write(“—–END PRIVATE KEY—–”);

fw.close();

}

public static void main(String args[]) throws Exception{

ExportPrivateKey export=new ExportPrivateKey();

export.keystoreFile=new File(“/Users/Luke/Workspace/StringTest/src/com/lukejin/stringtest/keystore.jks”);

export.keyStoreType=”JKS”;

export.password=”changeit”.toCharArray();

export.alias=”tom_server”;

export.exportedFile=new File(“luke”);

export.export();

}

}