![](/media/cache/img/default_profile.jpg.50x50_q85.jpg)
Embedded C project:18/12/2014
Dependencies: DS1307 TextLCD mbed
Diff: NetServices/services/mysql/mycrypt.c
- Revision:
- 0:8d87bc453349
diff -r 000000000000 -r 8d87bc453349 NetServices/services/mysql/mycrypt.c --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/NetServices/services/mysql/mycrypt.c Thu Dec 18 09:35:49 2014 +0000 @@ -0,0 +1,131 @@ +/* Copyright (C) 2007 MySQL AB & Michael Widenius + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; version 2 of the License. + + This program 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 for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ + +#define SCRAMBLE_LENGTH_323 8 + +#include <string.h> +#include <math.h> + +typedef unsigned int uint; +typedef unsigned long ulong; +typedef unsigned char uchar; + +struct my_rnd_struct { + unsigned long seed1,seed2,max_value; + double max_value_dbl; +}; + +static void my_rnd_init(struct my_rnd_struct *rand_st, ulong seed1, ulong seed2); +static double my_rnd(struct my_rnd_struct *rand_st); +static void hash_password(ulong *result, const char *password, uint password_len); + +/* + Initialize random generator + + NOTES + MySQL's password checks depends on this, so don't do any changes + that changes the random numbers that are generated! +*/ + +static void my_rnd_init(struct my_rnd_struct *rand_st, ulong seed1, ulong seed2) +{ + rand_st->max_value= 0x3FFFFFFFL; + rand_st->max_value_dbl=(double) rand_st->max_value; + rand_st->seed1=seed1%rand_st->max_value ; + rand_st->seed2=seed2%rand_st->max_value; +} + +/* + Generate random number. + + SYNOPSIS + my_rnd() + rand_st INOUT Structure used for number generation + + RETURN VALUE + generated pseudo random number +*/ + +static double my_rnd(struct my_rnd_struct *rand_st) +{ + rand_st->seed1=(rand_st->seed1*3+rand_st->seed2) % rand_st->max_value; + rand_st->seed2=(rand_st->seed1+rand_st->seed2+33) % rand_st->max_value; + return (((double) rand_st->seed1)/rand_st->max_value_dbl); +} + +/* + Generate binary hash from raw text string + Used for Pre-4.1 password handling + SYNOPSIS + hash_password() + result OUT store hash in this location + password IN plain text password to build hash + password_len IN password length (password may be not null-terminated) +*/ + +static void hash_password(ulong *result, const char *password, uint password_len) +{ + register ulong nr=1345345333L, add=7, nr2=0x12345671L; + ulong tmp; + const char *password_end= password + password_len; + for (; password < password_end; password++) + { + if (*password == ' ' || *password == '\t') + continue; /* skip space in password */ + tmp= (ulong) (uchar) *password; + nr^= (((nr & 63)+add)*tmp)+ (nr << 8); + nr2+=(nr2 << 8) ^ nr; + add+=tmp; + } + result[0]=nr & (((ulong) 1L << 31) -1L); /* Don't use sign bit (str2int) */; + result[1]=nr2 & (((ulong) 1L << 31) -1L); +} + + + +/* + Scramble string with password. + Used in pre 4.1 authentication phase. + SYNOPSIS + scramble_323() + to OUT Store scrambled message here. Buffer must be at least + SCRAMBLE_LENGTH_323+1 bytes long + message IN Message to scramble. Message must be at least + SRAMBLE_LENGTH_323 bytes long. + password IN Password to use while scrambling +*/ + +void scramble_323(char *to, const char *message, const char *password) +{ + struct my_rnd_struct rand_st; + ulong hash_pass[2], hash_message[2]; + + if (password && password[0]) + { + char extra, *to_start=to; + const char *message_end= message + SCRAMBLE_LENGTH_323; + hash_password(hash_pass,password, (uint) strlen(password)); + hash_password(hash_message, message, SCRAMBLE_LENGTH_323); + my_rnd_init(&rand_st,hash_pass[0] ^ hash_message[0], + hash_pass[1] ^ hash_message[1]); + for (; message < message_end; message++) + *to++= (char) (floor(my_rnd(&rand_st)*31)+64); + extra=(char) (floor(my_rnd(&rand_st)*31)); + while (to_start != to) + *(to_start++)^=extra; + } + *to= 0; +} +