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services/mysql/mycrypt.c@0:ac21159e27f4, 2010-07-02 (annotated)

Committer:: darran
Date:: Fri Jul 02 17:21:58 2010 +0000
Revision:: 0:ac21159e27f4

Who changed what in which revision?

User	Revision	Line number	New contents of line
darran	0:ac21159e27f4	1	/* Copyright (C) 2007 MySQL AB & Michael Widenius
darran	0:ac21159e27f4	2
darran	0:ac21159e27f4	3	This program is free software; you can redistribute it and/or modify
darran	0:ac21159e27f4	4	it under the terms of the GNU General Public License as published by
darran	0:ac21159e27f4	5	the Free Software Foundation; version 2 of the License.
darran	0:ac21159e27f4	6
darran	0:ac21159e27f4	7	This program is distributed in the hope that it will be useful,
darran	0:ac21159e27f4	8	but WITHOUT ANY WARRANTY; without even the implied warranty of
darran	0:ac21159e27f4	9	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
darran	0:ac21159e27f4	10	GNU General Public License for more details.
darran	0:ac21159e27f4	11
darran	0:ac21159e27f4	12	You should have received a copy of the GNU General Public License
darran	0:ac21159e27f4	13	along with this program; if not, write to the Free Software
darran	0:ac21159e27f4	14	Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
darran	0:ac21159e27f4	15
darran	0:ac21159e27f4	16	#define SCRAMBLE_LENGTH_323 8
darran	0:ac21159e27f4	17
darran	0:ac21159e27f4	18	#include <string.h>
darran	0:ac21159e27f4	19	#include <math.h>
darran	0:ac21159e27f4	20
darran	0:ac21159e27f4	21	typedef unsigned int uint;
darran	0:ac21159e27f4	22	typedef unsigned long ulong;
darran	0:ac21159e27f4	23	typedef unsigned char uchar;
darran	0:ac21159e27f4	24
darran	0:ac21159e27f4	25	struct my_rnd_struct {
darran	0:ac21159e27f4	26	unsigned long seed1,seed2,max_value;
darran	0:ac21159e27f4	27	double max_value_dbl;
darran	0:ac21159e27f4	28	};
darran	0:ac21159e27f4	29
darran	0:ac21159e27f4	30	static void my_rnd_init(struct my_rnd_struct *rand_st, ulong seed1, ulong seed2);
darran	0:ac21159e27f4	31	static double my_rnd(struct my_rnd_struct *rand_st);
darran	0:ac21159e27f4	32	static void hash_password(ulong result, const char password, uint password_len);
darran	0:ac21159e27f4	33
darran	0:ac21159e27f4	34	/*
darran	0:ac21159e27f4	35	Initialize random generator
darran	0:ac21159e27f4	36
darran	0:ac21159e27f4	37	NOTES
darran	0:ac21159e27f4	38	MySQL's password checks depends on this, so don't do any changes
darran	0:ac21159e27f4	39	that changes the random numbers that are generated!
darran	0:ac21159e27f4	40	*/
darran	0:ac21159e27f4	41
darran	0:ac21159e27f4	42	static void my_rnd_init(struct my_rnd_struct *rand_st, ulong seed1, ulong seed2)
darran	0:ac21159e27f4	43	{
darran	0:ac21159e27f4	44	rand_st->max_value= 0x3FFFFFFFL;
darran	0:ac21159e27f4	45	rand_st->max_value_dbl=(double) rand_st->max_value;
darran	0:ac21159e27f4	46	rand_st->seed1=seed1%rand_st->max_value ;
darran	0:ac21159e27f4	47	rand_st->seed2=seed2%rand_st->max_value;
darran	0:ac21159e27f4	48	}
darran	0:ac21159e27f4	49
darran	0:ac21159e27f4	50	/*
darran	0:ac21159e27f4	51	Generate random number.
darran	0:ac21159e27f4	52
darran	0:ac21159e27f4	53	SYNOPSIS
darran	0:ac21159e27f4	54	my_rnd()
darran	0:ac21159e27f4	55	rand_st INOUT Structure used for number generation
darran	0:ac21159e27f4	56
darran	0:ac21159e27f4	57	RETURN VALUE
darran	0:ac21159e27f4	58	generated pseudo random number
darran	0:ac21159e27f4	59	*/
darran	0:ac21159e27f4	60
darran	0:ac21159e27f4	61	static double my_rnd(struct my_rnd_struct *rand_st)
darran	0:ac21159e27f4	62	{
darran	0:ac21159e27f4	63	rand_st->seed1=(rand_st->seed1*3+rand_st->seed2) % rand_st->max_value;
darran	0:ac21159e27f4	64	rand_st->seed2=(rand_st->seed1+rand_st->seed2+33) % rand_st->max_value;
darran	0:ac21159e27f4	65	return (((double) rand_st->seed1)/rand_st->max_value_dbl);
darran	0:ac21159e27f4	66	}
darran	0:ac21159e27f4	67
darran	0:ac21159e27f4	68	/*
darran	0:ac21159e27f4	69	Generate binary hash from raw text string
darran	0:ac21159e27f4	70	Used for Pre-4.1 password handling
darran	0:ac21159e27f4	71	SYNOPSIS
darran	0:ac21159e27f4	72	hash_password()
darran	0:ac21159e27f4	73	result OUT store hash in this location
darran	0:ac21159e27f4	74	password IN plain text password to build hash
darran	0:ac21159e27f4	75	password_len IN password length (password may be not null-terminated)
darran	0:ac21159e27f4	76	*/
darran	0:ac21159e27f4	77
darran	0:ac21159e27f4	78	static void hash_password(ulong result, const char password, uint password_len)
darran	0:ac21159e27f4	79	{
darran	0:ac21159e27f4	80	register ulong nr=1345345333L, add=7, nr2=0x12345671L;
darran	0:ac21159e27f4	81	ulong tmp;
darran	0:ac21159e27f4	82	const char *password_end= password + password_len;
darran	0:ac21159e27f4	83	for (; password < password_end; password++)
darran	0:ac21159e27f4	84	{
darran	0:ac21159e27f4	85	if (password == ' ' \|\| password == '\t')
darran	0:ac21159e27f4	86	continue; /* skip space in password */
darran	0:ac21159e27f4	87	tmp= (ulong) (uchar) *password;
darran	0:ac21159e27f4	88	nr^= (((nr & 63)+add)*tmp)+ (nr << 8);
darran	0:ac21159e27f4	89	nr2+=(nr2 << 8) ^ nr;
darran	0:ac21159e27f4	90	add+=tmp;
darran	0:ac21159e27f4	91	}
darran	0:ac21159e27f4	92	result[0]=nr & (((ulong) 1L << 31) -1L); /* Don't use sign bit (str2int) */;
darran	0:ac21159e27f4	93	result[1]=nr2 & (((ulong) 1L << 31) -1L);
darran	0:ac21159e27f4	94	}
darran	0:ac21159e27f4	95
darran	0:ac21159e27f4	96
darran	0:ac21159e27f4	97
darran	0:ac21159e27f4	98	/*
darran	0:ac21159e27f4	99	Scramble string with password.
darran	0:ac21159e27f4	100	Used in pre 4.1 authentication phase.
darran	0:ac21159e27f4	101	SYNOPSIS
darran	0:ac21159e27f4	102	scramble_323()
darran	0:ac21159e27f4	103	to OUT Store scrambled message here. Buffer must be at least
darran	0:ac21159e27f4	104	SCRAMBLE_LENGTH_323+1 bytes long
darran	0:ac21159e27f4	105	message IN Message to scramble. Message must be at least
darran	0:ac21159e27f4	106	SRAMBLE_LENGTH_323 bytes long.
darran	0:ac21159e27f4	107	password IN Password to use while scrambling
darran	0:ac21159e27f4	108	*/
darran	0:ac21159e27f4	109
darran	0:ac21159e27f4	110	void scramble_323(char to, const char message, const char *password)
darran	0:ac21159e27f4	111	{
darran	0:ac21159e27f4	112	struct my_rnd_struct rand_st;
darran	0:ac21159e27f4	113	ulong hash_pass[2], hash_message[2];
darran	0:ac21159e27f4	114
darran	0:ac21159e27f4	115	if (password && password[0])
darran	0:ac21159e27f4	116	{
darran	0:ac21159e27f4	117	char extra, *to_start=to;
darran	0:ac21159e27f4	118	const char *message_end= message + SCRAMBLE_LENGTH_323;
darran	0:ac21159e27f4	119	hash_password(hash_pass,password, (uint) strlen(password));
darran	0:ac21159e27f4	120	hash_password(hash_message, message, SCRAMBLE_LENGTH_323);
darran	0:ac21159e27f4	121	my_rnd_init(&rand_st,hash_pass[0] ^ hash_message[0],
darran	0:ac21159e27f4	122	hash_pass[1] ^ hash_message[1]);
darran	0:ac21159e27f4	123	for (; message < message_end; message++)
darran	0:ac21159e27f4	124	to++= (char) (floor(my_rnd(&rand_st)31)+64);
darran	0:ac21159e27f4	125	extra=(char) (floor(my_rnd(&rand_st)*31));
darran	0:ac21159e27f4	126	while (to_start != to)
darran	0:ac21159e27f4	127	*(to_start++)^=extra;
darran	0:ac21159e27f4	128	}
darran	0:ac21159e27f4	129	*to= 0;
darran	0:ac21159e27f4	130	}
darran	0:ac21159e27f4	131

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Type:	Program
Mbed OS support:	Mbed 2 deprecated
Created:	02 Jul 2010
Imports:	2
Forks:	0
Commits:	1
Dependents:	0
Dependencies:	1
Followers:	1

services/mysql/mycrypt.c@0:ac21159e27f4, 2010-07-02 (annotated)

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