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package kunpu.security;
import sun.misc.BASE64Encoder;
import java.io.FileInputStream;
import java.io.FileWriter;
import java.security.*;
import java.security.cert.Certificate;
/**
* @author zhen
* @Date 2018/4/16 10:58
*/
public class ExportCert {
//导出证书 base64格式
public static void exportCert(KeyStore keyStore, String alias, String exportFile) throws Exception {
Certificate certificate = keyStore.getCertificate(alias);
BASE64Encoder encoder = new BASE64Encoder();
String encoded = encoder.encode(certificate.getEncoded());
FileWriter fw = new FileWriter(exportFile);
fw.write("------Begin Certificate----- \r\n ");//非必须
fw.write(encoded);
fw.write("\r\n-----End Certificate-----");//非必须
fw.close();
}
//得到KeyPair
public static KeyPair getKeyPair(KeyStore keyStore, String alias, char[] password){
try{
Key key = keyStore.getKey(alias, password);
if (key instanceof PrivateKey){
Certificate certificate = keyStore.getCertificate(alias);
PublicKey publicKey = certificate.getPublicKey();
return new KeyPair(publicKey, (PrivateKey) key);
}
}catch (UnrecoverableKeyException | NoSuchAlgorithmException | KeyStoreException e){
e.printStackTrace();
}
return null;
}
//导出私钥
public static void exportPrivateKey(PrivateKey privateKey, String exportFile) throws Exception {
BASE64Encoder encoder = new BASE64Encoder();
String encoded = encoder.encode(privateKey.getEncoded());
FileWriter fileWriter = new FileWriter(exportFile);
fileWriter.write("-----Begin Private Key-----\r\n");//非必须
fileWriter.write(encoded);
fileWriter.write("\r\n-----End Private Key-----");//非必须
fileWriter.close();
}
//导出公钥
public static void exportPublicKey(PublicKey publicKey, String exportFile) throws Exception {
BASE64Encoder encoder = new BASE64Encoder();
String encoded = encoder.encode(publicKey.getEncoded());
FileWriter fileWriter = new FileWriter(exportFile);
fileWriter.write("-----Begin Public Key-----\r\n");//非必须
fileWriter.write(encoded);
fileWriter.write("\r\n-----End Public Key-----");//非必须
fileWriter.close();
}
public static void main(String[] args) throws Exception{
String keyStoreType = "jks";
String keystoreFile = "D:\\project\\workspace\\HelloWorld\\out\\production\\HelloWorld\\kunpu\\ijvmkeys";
String password = "ijvm2ed"; //keystore的解析密码
String friendPassword = "friend4life";//条目的解析密码
KeyStore keyStore = KeyStore.getInstance(keyStoreType);
keyStore.load(new FileInputStream(keystoreFile), password.toCharArray());
String alias = "friend";//条目别名
String exportCertFile = "D:\\project\\workspace\\HelloWorld\\out\\production\\HelloWorld\\kunpu\\cert.txt";
String exportPrivateFile = "D:\\project\\workspace\\HelloWorld\\out\\production\\HelloWorld\\kunpu\\privateKey.txt";
String exportPublicFile = "D:\\project\\workspace\\HelloWorld\\out\\production\\HelloWorld\\kunpu\\publicKey.txt";
ExportCert.exportCert(keyStore, alias, exportCertFile);
KeyPair keyPair = ExportCert.getKeyPair(keyStore, alias, friendPassword.toCharArray()); //注意这里的密码是你的别名对应的密码，不指定的话就是你的keystore的解析密码
ExportCert.exportPrivateKey(keyPair.getPrivate(), exportPrivateFile);
ExportCert.exportPublicKey(keyPair.getPublic(), exportPublicFile);
System.out.println("OK");
}
}
程序猿的技术大观园：www.javathinker.net
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Java技术网站 → 『 Java开发技术 』 → 『 Java编程技术专题 』 → 通过JSSE API获得密钥库中密钥对的公钥和私钥
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