1 /*

     2  * Hedgewars, a worms-like game

     3  * Copyright (c) 2005 Andrey Korotaev <unC0Rr@gmail.com>

     4  *

     5  * Distributed under the terms of the BSD-modified licence:

     6  *

     7  * Permission is hereby granted, free of charge, to any person obtaining a copy

     8  * of this software and associated documentation files (the "Software"), to deal

     9  * with the Software without restriction, including without limitation the

    10  * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or

    11  * sell copies of the Software, and to permit persons to whom the Software is

    12  * furnished to do so, subject to the following conditions:

    13  *

    14  * 1. Redistributions of source code must retain the above copyright notice,

    15  *    this list of conditions and the following disclaimer.

    16  * 2. Redistributions in binary form must reproduce the above copyright notice,

    17  *    this list of conditions and the following disclaimer in the documentation

    18  *    and/or other materials provided with the distribution.

    19  * 3. The name of the author may not be used to endorse or promote products

    20  *    derived from this software without specific prior written permission.

    21  *

    22  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED

    23  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF

    24  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO

    25  * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

    26  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

    27  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;

    28  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,

    29  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR

    30  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF

    31  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

    32  */

    33 

    34 #include <QDateTime>

    35 #include "rndstr.h"

    36 

    37 const char * letters = "qwertyuiopasdfghjklzxcvbnm" \

    38                        "QWERTYUIOPASDFGHJKLZXCVBNM" \

    39                        "0123456789";

    40 const quint8 letterscnt = 62;

    41 

    42 const char * upd = "/hw!/";

    43 const quint8 updcnt = 5;

    44 

    45 RNDStr::RNDStr()

    46 {

    47 	SHA1Init(&ctx);

    48 	QDateTime now = QDateTime::currentDateTime();

    49 	QDateTime zero;

    50 	int secs = now.secsTo(zero);

    51 	SHA1Update(&ctx, (quint8 *)&secs, sizeof(int));

    52 }

    53 

    54 void RNDStr::GenRNDStr(QString & str, quint32 len)

    55 {

    56 	str = "";

    57 	sha1_ctxt tmpctx;

    58 	sha1_digest digest;

    59 	for(quint32 i = 0; i < len; i++)

    60 	{

    61 		SHA1Update(&ctx, (quint8 *)upd, updcnt);

    62 		qMemCopy(&tmpctx, &ctx, sizeof(sha1_ctxt));

    63 		SHA1Final(digest, &tmpctx);

    64 		int index = (digest[3] + digest[11] + digest[17]) % letterscnt;

    65 		str += letters[index];

    66 	}

    67 }