'How do I programmatically create a new KeyStore?

I'm trying to programmatically create a new keystore in Java. The following code:

KeyStore keyStore = KeyStore.getInstance(KeyStore.getDefaultType());
keyStore.setCertificateEntry("alias", cert);

throws a Uninitialized KeyStore exception.

javakeystore


Solution 1:[1]

The KeyStore needs to be loaded after it has been created. The load method asks for a FileInputStream to read from but if you supply a null one, an empty KeyStore is loaded.

See this link

Solution 2:[2]

To create a new KeyStore in Java you first need to create the KeyStore file and then store it using the store(FileOutputStream, char[]) method:

KeyStore ks = KeyStore.getInstance(KeyStore.getDefaultType());

char[] password = "some password".toCharArray();
ks.load(null, password);

// Store away the keystore.
FileOutputStream fos = new FileOutputStream("newKeyStoreFileName");
ks.store(fos, password);
fos.close();

I hope this helps, you can see more info here.

Solution 3:[3]

I use this code, it works, hope it can help.

public static KeyStore createKeyStore() throws Exception {
    File file = new File("/Users/keyserverstore.keystore");
    KeyStore keyStore = KeyStore.getInstance("JKS");
    if (file.exists()) {
        // if exists, load
        keyStore.load(new FileInputStream(file), "123456".toCharArray());
    } else {
        // if not exists, create
        keyStore.load(null, null);
        keyStore.store(new FileOutputStream(file), "123456".toCharArray());
    }
    return keyStore;
}

Solution 4:[4]

 // load the keystore
 KeyStore p12 = KeyStore.getInstance("pkcs12");
 p12.load(new FileInputStream("KEYSTORE.p12"), "passwd".toCharArray());

// load the private key entry from the keystore  
 Key key = p12.getKey("mykey", "passwd".toCharArray()); 
 PrivateKey privKey = (PrivateKey) key;

Solution 5:[5]

If you want to use a bean (Spring Boot 2.4.x):

import java.io.IOException;
import java.security.KeyStore;
import java.security.KeyStoreException;
import java.security.NoSuchAlgorithmException;
import java.security.cert.CertificateException;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.io.ClassPathResource;

@Configuration
public class KeyStoreConfiguration {

    private static final String KEY_STORE = "keystore.p12";
    private static final String KEY_STORE_TYPE = "PKCS12";
    private static final String KEY_STORE_PASSWORD = "password";
    
    @Bean
    public KeyStore keyStore() throws KeyStoreException, NoSuchAlgorithmException, CertificateException, IOException {
        KeyStore keyStore = KeyStore.getInstance(KEY_STORE_TYPE);
        keyStore.load(new ClassPathResource(KEY_STORE).getInputStream(), KEY_STORE_PASSWORD.toCharArray());
        
        return keyStore;
    }
}

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source
Solution 1 DJClayworth
Solution 2 Assaf Gamliel
Solution 3 Jay
Solution 4 Nadeeshan Herath
Solution 5 jumping_monkey

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