Certificado digital

public static void main(String[] args) throws Exception {
        File f = new File("/opt/assinaturadigital/orion.jks");
        getPrivateKeyFromFile(f, "orion", "orion2");
    }

    public static PrivateKey getPrivateKeyFromFile( File cert, String alias, String password ) throws Exception {
    KeyStore ks = KeyStore.getInstance ( "JKS" );
    char[] pwd = "orion2".toCharArray();
    InputStream is = new FileInputStream( cert );
    ks.load( is, pwd );

    is.close();

    Key key = ks.getKey(alias, pwd);
    if( key instanceof PrivateKey ) {
        System.out.println("passou");
        return (PrivateKey) key;
    }
 
    return null;
}

Key key = ks.getKey(alias, pwd);