Java – RSA key pairs are generated and stored in the keystore

I try to generate an RSA key pair and store it in the HSM keystore My current code is as follows:

String configName = "C:\\eTokenConfig.cfg";
    Provider p = new sun.security.pkcs11.SunPKCS11(configName);
    Security.addProvider(p);
    // Read the keystore form the smart card
    char[] pin = { 'p','4','s','w','0','r','d' };
    KeyStore keyStore = KeyStore.getInstance("PKCS11",p);
    keyStore.load(null,pin);
    //generate keys
    KeyPairGenerator kpg = KeyPairGenerator.getInstance("RSA",p);
    kpg.initialize(512);
    KeyPair pair = kpg.generateKeyPair();

    PrivateKey privateKey = pair.getPrivate();
    PublicKey publicKey = pair.getPublic();
    // Save Keys How ???

I tried to use keystore Setentry method, but the problem is that it requires a certificate chain. I don't know how to obtain this certificate?

Solution

See http://docs.oracle.com/javase/tutorial/security/apisign/vstep2.html

Save public key:

X509EncodedKeySpec x509ks = new X509EncodedKeySpec(
            publicKey.getEncoded());
    FileOutputStream fos = new FileOutputStream(strPathFilePubKey);
    fos.write(x509ks.getEncoded());

Load public key:

byte[] encodedKey = IoUtils.toByteArray(new FileInputStream(strPathFilePubKey));
    KeyFactory keyFactory = KeyFactory.getInstance("RSA",p);
    X509EncodedKeySpec pkSpec = new X509EncodedKeySpec(
            encodedKey);
    PublicKey publicKey = keyFactory.generatePublic(pkSpec);

Save private key:

PKCS8EncodedKeySpec pkcsKeySpec = new PKCS8EncodedKeySpec(
            privateKey.getEncoded());
    FileOutputStream fos = new FileOutputStream(strPathFilePrivbKey);
    fos.write(pkcsKeySpec.getEncoded());

Load private key:

byte[] encodedKey = IoUtils.toByteArray(new FileInputStream(strPathFilePrivKey));
    KeyFactory keyFactory = KeyFactory.getInstance("RSA",p);
    PKCS8EncodedKeySpec privKeySpec = new PKCS8EncodedKeySpec(
            encodedKey);
    PrivateKey privateKey = keyFactory.generatePrivate(privKeySpec);