Extract the private key, certificate __java from the Java keystore file

KeyStore is a password-protected file that holds the private key and the certificate. Can be generated from the Keytool tool with the JDK.

But the Keytool tool does not provide a convenient way to get the private keys and certificates from KeyStore files everywhere.

So it is possible to encode the relevant work through the Java.security.KeyStore class provided by the JDK.

[Java]  View Plain  copy 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.base64encoder;       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 {                 &nBsp;            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;              }   &NBsp;                 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&nbsP;privatekey=keypair.getprivate ();                      string encoded=encoder.encode (privateKey.getEncoded ());                       filewriter fw=new filewriter (Exportedfile);