joshua Elsdon / Mbed 2 deprecated Email2Screen

Mac addr added ICRS

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Fork of Email2Screen by Oliver Mattos

NetServicesProxy/services/mysql/mycrypt.c@0:1619a6b826d7, 2011-11-21 (annotated)

Committer:
Hello1024
Date:
Mon Nov 21 18:25:34 2011 +0000
Revision:
0:1619a6b826d7

        

        
Who changed what in which revision?

        

            
                
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/* Copyright (C) 2007 MySQL AB & Michael Widenius





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





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   it under the terms of the GNU General Public License as published by





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   the Free Software Foundation; version 2 of the License.





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   This program is distributed in the hope that it will be useful,





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   but WITHOUT ANY WARRANTY; without even the implied warranty of





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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the





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   GNU General Public License for more details.





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





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   along with this program; if not, write to the Free Software





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   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */





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#define SCRAMBLE_LENGTH_323 8





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#include <string.h>





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#include <math.h>





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typedef unsigned int uint;





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typedef unsigned long ulong;





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typedef unsigned char uchar;





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struct my_rnd_struct {





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  unsigned long seed1,seed2,max_value;





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  double max_value_dbl;





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};





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static void my_rnd_init(struct my_rnd_struct *rand_st, ulong seed1, ulong seed2);





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static double my_rnd(struct my_rnd_struct *rand_st);





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static void hash_password(ulong *result, const char *password, uint password_len);





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/*





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  Initialize random generator





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  NOTES





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    MySQL's password checks depends on this, so don't do any changes





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    that changes the random numbers that are generated!





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*/





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static void my_rnd_init(struct my_rnd_struct *rand_st, ulong seed1, ulong seed2)





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{





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  rand_st->max_value= 0x3FFFFFFFL;





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  rand_st->max_value_dbl=(double) rand_st->max_value;





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  rand_st->seed1=seed1%rand_st->max_value ;





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  rand_st->seed2=seed2%rand_st->max_value;





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}





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/*





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  Generate random number.





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  SYNOPSIS





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    my_rnd()





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    rand_st    INOUT  Structure used for number generation





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  RETURN VALUE





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    generated pseudo random number





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*/





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static double my_rnd(struct my_rnd_struct *rand_st)





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{





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  rand_st->seed1=(rand_st->seed1*3+rand_st->seed2) % rand_st->max_value;





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  rand_st->seed2=(rand_st->seed1+rand_st->seed2+33) % rand_st->max_value;





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  return (((double) rand_st->seed1)/rand_st->max_value_dbl);





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}





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/*





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    Generate binary hash from raw text string 





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    Used for Pre-4.1 password handling





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  SYNOPSIS





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    hash_password()





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    result       OUT store hash in this location





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    password     IN  plain text password to build hash





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    password_len IN  password length (password may be not null-terminated)





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*/





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static void hash_password(ulong *result, const char *password, uint password_len)





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{





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  register ulong nr=1345345333L, add=7, nr2=0x12345671L;





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  ulong tmp;





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  const char *password_end= password + password_len;





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  for (; password < password_end; password++)





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  {





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    if (*password == ' ' || *password == '\t')





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      continue;                                 /* skip space in password */





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    tmp= (ulong) (uchar) *password;





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    nr^= (((nr & 63)+add)*tmp)+ (nr << 8);





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    nr2+=(nr2 << 8) ^ nr;





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    add+=tmp;





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  }





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  result[0]=nr & (((ulong) 1L << 31) -1L); /* Don't use sign bit (str2int) */;





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  result[1]=nr2 & (((ulong) 1L << 31) -1L);





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}





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/*





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    Scramble string with password.





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    Used in pre 4.1 authentication phase.





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  SYNOPSIS





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    scramble_323()





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    to       OUT Store scrambled message here. Buffer must be at least





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                 SCRAMBLE_LENGTH_323+1 bytes long





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    message  IN  Message to scramble. Message must be at least





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                 SRAMBLE_LENGTH_323 bytes long.





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    password IN  Password to use while scrambling





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*/





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void scramble_323(char *to, const char *message, const char *password)





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{





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  struct my_rnd_struct rand_st;





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  ulong hash_pass[2], hash_message[2];





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  if (password && password[0])





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  {





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    char extra, *to_start=to;





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    const char *message_end= message + SCRAMBLE_LENGTH_323;





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    hash_password(hash_pass,password, (uint) strlen(password));





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    hash_password(hash_message, message, SCRAMBLE_LENGTH_323);





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    my_rnd_init(&rand_st,hash_pass[0] ^ hash_message[0],





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               hash_pass[1] ^ hash_message[1]);





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    for (; message < message_end; message++)





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      *to++= (char) (floor(my_rnd(&rand_st)*31)+64);





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    extra=(char) (floor(my_rnd(&rand_st)*31));





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    while (to_start != to)





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      *(to_start++)^=extra;





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  }





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  *to= 0;





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}





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