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services/mysql/mycrypt.c@0:281d6ff68967, 2010-11-19 (annotated)

Committer:: hexley
Date:: Fri Nov 19 01:54:45 2010 +0000
Revision:: 0:281d6ff68967

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User	Revision	Line number	New contents of line
hexley	0:281d6ff68967	1	/* Copyright (C) 2007 MySQL AB & Michael Widenius
hexley	0:281d6ff68967	2
hexley	0:281d6ff68967	3	This program is free software; you can redistribute it and/or modify
hexley	0:281d6ff68967	4	it under the terms of the GNU General Public License as published by
hexley	0:281d6ff68967	5	the Free Software Foundation; version 2 of the License.
hexley	0:281d6ff68967	6
hexley	0:281d6ff68967	7	This program is distributed in the hope that it will be useful,
hexley	0:281d6ff68967	8	but WITHOUT ANY WARRANTY; without even the implied warranty of
hexley	0:281d6ff68967	9	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
hexley	0:281d6ff68967	10	GNU General Public License for more details.
hexley	0:281d6ff68967	11
hexley	0:281d6ff68967	12	You should have received a copy of the GNU General Public License
hexley	0:281d6ff68967	13	along with this program; if not, write to the Free Software
hexley	0:281d6ff68967	14	Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
hexley	0:281d6ff68967	15
hexley	0:281d6ff68967	16	#define SCRAMBLE_LENGTH_323 8
hexley	0:281d6ff68967	17
hexley	0:281d6ff68967	18	#include <string.h>
hexley	0:281d6ff68967	19	#include <math.h>
hexley	0:281d6ff68967	20
hexley	0:281d6ff68967	21	typedef unsigned int uint;
hexley	0:281d6ff68967	22	typedef unsigned long ulong;
hexley	0:281d6ff68967	23	typedef unsigned char uchar;
hexley	0:281d6ff68967	24
hexley	0:281d6ff68967	25	struct my_rnd_struct {
hexley	0:281d6ff68967	26	unsigned long seed1,seed2,max_value;
hexley	0:281d6ff68967	27	double max_value_dbl;
hexley	0:281d6ff68967	28	};
hexley	0:281d6ff68967	29
hexley	0:281d6ff68967	30	static void my_rnd_init(struct my_rnd_struct *rand_st, ulong seed1, ulong seed2);
hexley	0:281d6ff68967	31	static double my_rnd(struct my_rnd_struct *rand_st);
hexley	0:281d6ff68967	32	static void hash_password(ulong result, const char password, uint password_len);
hexley	0:281d6ff68967	33
hexley	0:281d6ff68967	34	/*
hexley	0:281d6ff68967	35	Initialize random generator
hexley	0:281d6ff68967	36
hexley	0:281d6ff68967	37	NOTES
hexley	0:281d6ff68967	38	MySQL's password checks depends on this, so don't do any changes
hexley	0:281d6ff68967	39	that changes the random numbers that are generated!
hexley	0:281d6ff68967	40	*/
hexley	0:281d6ff68967	41
hexley	0:281d6ff68967	42	static void my_rnd_init(struct my_rnd_struct *rand_st, ulong seed1, ulong seed2)
hexley	0:281d6ff68967	43	{
hexley	0:281d6ff68967	44	rand_st->max_value= 0x3FFFFFFFL;
hexley	0:281d6ff68967	45	rand_st->max_value_dbl=(double) rand_st->max_value;
hexley	0:281d6ff68967	46	rand_st->seed1=seed1%rand_st->max_value ;
hexley	0:281d6ff68967	47	rand_st->seed2=seed2%rand_st->max_value;
hexley	0:281d6ff68967	48	}
hexley	0:281d6ff68967	49
hexley	0:281d6ff68967	50	/*
hexley	0:281d6ff68967	51	Generate random number.
hexley	0:281d6ff68967	52
hexley	0:281d6ff68967	53	SYNOPSIS
hexley	0:281d6ff68967	54	my_rnd()
hexley	0:281d6ff68967	55	rand_st INOUT Structure used for number generation
hexley	0:281d6ff68967	56
hexley	0:281d6ff68967	57	RETURN VALUE
hexley	0:281d6ff68967	58	generated pseudo random number
hexley	0:281d6ff68967	59	*/
hexley	0:281d6ff68967	60
hexley	0:281d6ff68967	61	static double my_rnd(struct my_rnd_struct *rand_st)
hexley	0:281d6ff68967	62	{
hexley	0:281d6ff68967	63	rand_st->seed1=(rand_st->seed1*3+rand_st->seed2) % rand_st->max_value;
hexley	0:281d6ff68967	64	rand_st->seed2=(rand_st->seed1+rand_st->seed2+33) % rand_st->max_value;
hexley	0:281d6ff68967	65	return (((double) rand_st->seed1)/rand_st->max_value_dbl);
hexley	0:281d6ff68967	66	}
hexley	0:281d6ff68967	67
hexley	0:281d6ff68967	68	/*
hexley	0:281d6ff68967	69	Generate binary hash from raw text string
hexley	0:281d6ff68967	70	Used for Pre-4.1 password handling
hexley	0:281d6ff68967	71	SYNOPSIS
hexley	0:281d6ff68967	72	hash_password()
hexley	0:281d6ff68967	73	result OUT store hash in this location
hexley	0:281d6ff68967	74	password IN plain text password to build hash
hexley	0:281d6ff68967	75	password_len IN password length (password may be not null-terminated)
hexley	0:281d6ff68967	76	*/
hexley	0:281d6ff68967	77
hexley	0:281d6ff68967	78	static void hash_password(ulong result, const char password, uint password_len)
hexley	0:281d6ff68967	79	{
hexley	0:281d6ff68967	80	register ulong nr=1345345333L, add=7, nr2=0x12345671L;
hexley	0:281d6ff68967	81	ulong tmp;
hexley	0:281d6ff68967	82	const char *password_end= password + password_len;
hexley	0:281d6ff68967	83	for (; password < password_end; password++)
hexley	0:281d6ff68967	84	{
hexley	0:281d6ff68967	85	if (password == ' ' \|\| password == '\t')
hexley	0:281d6ff68967	86	continue; /* skip space in password */
hexley	0:281d6ff68967	87	tmp= (ulong) (uchar) *password;
hexley	0:281d6ff68967	88	nr^= (((nr & 63)+add)*tmp)+ (nr << 8);
hexley	0:281d6ff68967	89	nr2+=(nr2 << 8) ^ nr;
hexley	0:281d6ff68967	90	add+=tmp;
hexley	0:281d6ff68967	91	}
hexley	0:281d6ff68967	92	result[0]=nr & (((ulong) 1L << 31) -1L); /* Don't use sign bit (str2int) */;
hexley	0:281d6ff68967	93	result[1]=nr2 & (((ulong) 1L << 31) -1L);
hexley	0:281d6ff68967	94	}
hexley	0:281d6ff68967	95
hexley	0:281d6ff68967	96
hexley	0:281d6ff68967	97
hexley	0:281d6ff68967	98	/*
hexley	0:281d6ff68967	99	Scramble string with password.
hexley	0:281d6ff68967	100	Used in pre 4.1 authentication phase.
hexley	0:281d6ff68967	101	SYNOPSIS
hexley	0:281d6ff68967	102	scramble_323()
hexley	0:281d6ff68967	103	to OUT Store scrambled message here. Buffer must be at least
hexley	0:281d6ff68967	104	SCRAMBLE_LENGTH_323+1 bytes long
hexley	0:281d6ff68967	105	message IN Message to scramble. Message must be at least
hexley	0:281d6ff68967	106	SRAMBLE_LENGTH_323 bytes long.
hexley	0:281d6ff68967	107	password IN Password to use while scrambling
hexley	0:281d6ff68967	108	*/
hexley	0:281d6ff68967	109
hexley	0:281d6ff68967	110	void scramble_323(char to, const char message, const char *password)
hexley	0:281d6ff68967	111	{
hexley	0:281d6ff68967	112	struct my_rnd_struct rand_st;
hexley	0:281d6ff68967	113	ulong hash_pass[2], hash_message[2];
hexley	0:281d6ff68967	114
hexley	0:281d6ff68967	115	if (password && password[0])
hexley	0:281d6ff68967	116	{
hexley	0:281d6ff68967	117	char extra, *to_start=to;
hexley	0:281d6ff68967	118	const char *message_end= message + SCRAMBLE_LENGTH_323;
hexley	0:281d6ff68967	119	hash_password(hash_pass,password, (uint) strlen(password));
hexley	0:281d6ff68967	120	hash_password(hash_message, message, SCRAMBLE_LENGTH_323);
hexley	0:281d6ff68967	121	my_rnd_init(&rand_st,hash_pass[0] ^ hash_message[0],
hexley	0:281d6ff68967	122	hash_pass[1] ^ hash_message[1]);
hexley	0:281d6ff68967	123	for (; message < message_end; message++)
hexley	0:281d6ff68967	124	to++= (char) (floor(my_rnd(&rand_st)31)+64);
hexley	0:281d6ff68967	125	extra=(char) (floor(my_rnd(&rand_st)*31));
hexley	0:281d6ff68967	126	while (to_start != to)
hexley	0:281d6ff68967	127	*(to_start++)^=extra;
hexley	0:281d6ff68967	128	}
hexley	0:281d6ff68967	129	*to= 0;
hexley	0:281d6ff68967	130	}
hexley	0:281d6ff68967	131

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Type:	Library
Created:	19 Nov 2010
Imports:	44
Forks:	0
Commits:	1
Dependents:	0
Dependencies:	0
Followers:	1

services/mysql/mycrypt.c@0:281d6ff68967, 2010-11-19 (annotated)

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