/*

 * Copyright (c) 1996, 2015, 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) {

        long temp = System.currentTimeMillis() / 1000;

        int gmt_unix_time;

        if (temp < Integer.MAX_VALUE) {

            gmt_unix_time = (int) temp;

        } else {

            gmt_unix_time = Integer.MAX_VALUE;          // Whoops!

        }

        random_bytes = new byte[32];

        generator.nextBytes(random_bytes);

        random_bytes[0] = (byte)(gmt_unix_time >> 24);

        random_bytes[1] = (byte)(gmt_unix_time >> 16);

        random_bytes[2] = (byte)(gmt_unix_time >>  8);

        random_bytes[3] = (byte)gmt_unix_time;

    }

    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) {

        int i, gmt_unix_time;

        gmt_unix_time = ((random_bytes[0] & 0xFF) << 24) |

                        ((random_bytes[1] & 0xFF) << 16) |

                        ((random_bytes[2] & 0xFF) << 8) |

                         (random_bytes[3] & 0xFF);

        s.print("GMT: " + gmt_unix_time + " ");

        s.print("bytes = { ");

        for (i = 4; i < 32; i++) {

            if (i != 4) {

                s.print(", ");

            }

            s.print(random_bytes[i] & 0x0ff);

        }

        s.println(" }");

    }

}