/*

 * Copyright (c) 1996, 2016, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package sun.security.ssl;

import java.io.*;

import java.security.SecureRandom;

/*

 * RandomCookie ... SSL hands standard format random cookies (nonces)

 * around.  These know how to encode/decode themselves on SSL streams,

 * and can be created and printed.

 *

 * @author David Brownell

 */

final class RandomCookie {

    byte[] random_bytes;  // exactly 32 bytes

    RandomCookie(SecureRandom generator) {

        random_bytes = new byte[32];

        generator.nextBytes(random_bytes);

    }

    RandomCookie(HandshakeInStream m) throws IOException {

        random_bytes = new byte[32];

        m.read(random_bytes, 0, 32);

    }

    void send(HandshakeOutStream out) throws IOException {

        out.write(random_bytes, 0, 32);

    }

    void print(PrintStream s) {

        s.print("random_bytes = {");

        for (int i = 0; i < 32; i++) {

            int k = random_bytes[i] & 0xFF;

            if (i != 0) {

                s.print(' ');

            }

            s.print(Utilities.hexDigits[k >>> 4]);

            s.print(Utilities.hexDigits[k & 0xf]);

        }

        s.println("}");

    }

}