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ircd/random.c
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158
ircd/random.c
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/************************************************************************
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* IRC - Internet Relay Chat, ircd/random.c
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*
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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; either version 1, or (at your option)
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* any later version.
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*
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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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*
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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., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/time.h>
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#include "config.h"
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char localkey[8] = RANDOM_SEED;
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/*
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* MD5 transform algorithm, taken from code written by Colin Plumb,
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* and put into the public domain
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*
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* Kev: Taken from Ted T'so's /dev/random random.c code and modified to
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* be slightly simpler. That code is released under a BSD-style copyright
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* OR under the terms of the GNU Public License, which should be included
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* at the top of this source file.
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*
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* record: Cleaned up to work with ircd. RANDOM_TOKEN is defined in
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* setup.h by the make script; if people start to "guess" your cookies,
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* consider recompiling your server with a different random token.
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*/
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/* The four core functions - F1 is optimized somewhat */
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#define F1(x, y, z) (z ^ (x & (y ^ z)))
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#define F2(x, y, z) F1(z, x, y)
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#define F3(x, y, z) (x ^ y ^ z)
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#define F4(x, y, z) (y ^ (x | ~z))
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/* This is the central step in the MD5 algorithm. */
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#define MD5STEP(f, w, x, y, z, data, s) \
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( w += f(x, y, z) + data, w = w<<s | w>>(32-s), w += x )
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/*
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* The core of the MD5 algorithm, this alters an existing MD5 hash to
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* reflect the addition of 16 longwords of new data. MD5Update blocks
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* the data and converts bytes into longwords for this routine.
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*
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* original comment left in; this used to be called MD5Transform and took
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* two arguments; I've internalized those arguments, creating the character
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* array "localkey," which should contain 8 bytes of data. The function also
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* originally returned nothing; now it returns an unsigned long that is the
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* random number. It appears to be reallyrandom, so... -Kev
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*
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* I don't really know what this does. I tried to figure it out and got
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* a headache. If you know what's good for you, you'll leave this stuff
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* for the smart people and do something else. -record
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*/
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unsigned long ircrandom(void)
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{
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unsigned long a, b, c, d;
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unsigned char in[16];
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struct timeval tv;
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(void)gettimeofday(&tv, NULL);
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(void)memcpy((void *)in, (void *)localkey, 8);
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(void)memcpy((void *)(in+8), (void *)&tv.tv_sec, 4);
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(void)memcpy((void *)(in+12), (void *)&tv.tv_usec, 4);
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a = 0x67452301;
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b = 0xefcdab89;
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c = 0x98badcfe;
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d = 0x10325476;
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MD5STEP(F1, a, b, c, d, (long)in[ 0]+0xd76aa478, 7);
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MD5STEP(F1, d, a, b, c, (long)in[ 1]+0xe8c7b756, 12);
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MD5STEP(F1, c, d, a, b, (long)in[ 2]+0x242070db, 17);
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MD5STEP(F1, b, c, d, a, (long)in[ 3]+0xc1bdceee, 22);
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MD5STEP(F1, a, b, c, d, (long)in[ 4]+0xf57c0faf, 7);
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MD5STEP(F1, d, a, b, c, (long)in[ 5]+0x4787c62a, 12);
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MD5STEP(F1, c, d, a, b, (long)in[ 6]+0xa8304613, 17);
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MD5STEP(F1, b, c, d, a, (long)in[ 7]+0xfd469501, 22);
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MD5STEP(F1, a, b, c, d, (long)in[ 8]+0x698098d8, 7);
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MD5STEP(F1, d, a, b, c, (long)in[ 9]+0x8b44f7af, 12);
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MD5STEP(F1, c, d, a, b, (long)in[10]+0xffff5bb1, 17);
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MD5STEP(F1, b, c, d, a, (long)in[11]+0x895cd7be, 22);
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MD5STEP(F1, a, b, c, d, (long)in[12]+0x6b901122, 7);
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MD5STEP(F1, d, a, b, c, (long)in[13]+0xfd987193, 12);
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MD5STEP(F1, c, d, a, b, (long)in[14]+0xa679438e, 17);
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MD5STEP(F1, b, c, d, a, (long)in[15]+0x49b40821, 22);
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MD5STEP(F2, a, b, c, d, (long)in[ 1]+0xf61e2562, 5);
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MD5STEP(F2, d, a, b, c, (long)in[ 6]+0xc040b340, 9);
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MD5STEP(F2, c, d, a, b, (long)in[11]+0x265e5a51, 14);
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MD5STEP(F2, b, c, d, a, (long)in[ 0]+0xe9b6c7aa, 20);
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MD5STEP(F2, a, b, c, d, (long)in[ 5]+0xd62f105d, 5);
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MD5STEP(F2, d, a, b, c, (long)in[10]+0x02441453, 9);
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MD5STEP(F2, c, d, a, b, (long)in[15]+0xd8a1e681, 14);
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MD5STEP(F2, b, c, d, a, (long)in[ 4]+0xe7d3fbc8, 20);
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MD5STEP(F2, a, b, c, d, (long)in[ 9]+0x21e1cde6, 5);
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MD5STEP(F2, d, a, b, c, (long)in[14]+0xc33707d6, 9);
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MD5STEP(F2, c, d, a, b, (long)in[ 3]+0xf4d50d87, 14);
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MD5STEP(F2, b, c, d, a, (long)in[ 8]+0x455a14ed, 20);
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MD5STEP(F2, a, b, c, d, (long)in[13]+0xa9e3e905, 5);
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MD5STEP(F2, d, a, b, c, (long)in[ 2]+0xfcefa3f8, 9);
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MD5STEP(F2, c, d, a, b, (long)in[ 7]+0x676f02d9, 14);
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MD5STEP(F2, b, c, d, a, (long)in[12]+0x8d2a4c8a, 20);
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MD5STEP(F3, a, b, c, d, (long)in[ 5]+0xfffa3942, 4);
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MD5STEP(F3, d, a, b, c, (long)in[ 8]+0x8771f681, 11);
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MD5STEP(F3, c, d, a, b, (long)in[11]+0x6d9d6122, 16);
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MD5STEP(F3, b, c, d, a, (long)in[14]+0xfde5380c, 23);
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MD5STEP(F3, a, b, c, d, (long)in[ 1]+0xa4beea44, 4);
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MD5STEP(F3, d, a, b, c, (long)in[ 4]+0x4bdecfa9, 11);
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MD5STEP(F3, c, d, a, b, (long)in[ 7]+0xf6bb4b60, 16);
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MD5STEP(F3, b, c, d, a, (long)in[10]+0xbebfbc70, 23);
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MD5STEP(F3, a, b, c, d, (long)in[13]+0x289b7ec6, 4);
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MD5STEP(F3, d, a, b, c, (long)in[ 0]+0xeaa127fa, 11);
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MD5STEP(F3, c, d, a, b, (long)in[ 3]+0xd4ef3085, 16);
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MD5STEP(F3, b, c, d, a, (long)in[ 6]+0x04881d05, 23);
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MD5STEP(F3, a, b, c, d, (long)in[ 9]+0xd9d4d039, 4);
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MD5STEP(F3, d, a, b, c, (long)in[12]+0xe6db99e5, 11);
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MD5STEP(F3, c, d, a, b, (long)in[15]+0x1fa27cf8, 16);
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MD5STEP(F3, b, c, d, a, (long)in[ 2]+0xc4ac5665, 23);
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MD5STEP(F4, a, b, c, d, (long)in[ 0]+0xf4292244, 6);
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MD5STEP(F4, d, a, b, c, (long)in[ 7]+0x432aff97, 10);
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MD5STEP(F4, c, d, a, b, (long)in[14]+0xab9423a7, 15);
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MD5STEP(F4, b, c, d, a, (long)in[ 5]+0xfc93a039, 21);
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MD5STEP(F4, a, b, c, d, (long)in[12]+0x655b59c3, 6);
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MD5STEP(F4, d, a, b, c, (long)in[ 3]+0x8f0ccc92, 10);
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MD5STEP(F4, c, d, a, b, (long)in[10]+0xffeff47d, 15);
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MD5STEP(F4, b, c, d, a, (long)in[ 1]+0x85845dd1, 21);
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MD5STEP(F4, a, b, c, d, (long)in[ 8]+0x6fa87e4f, 6);
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MD5STEP(F4, d, a, b, c, (long)in[15]+0xfe2ce6e0, 10);
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MD5STEP(F4, c, d, a, b, (long)in[ 6]+0xa3014314, 15);
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MD5STEP(F4, b, c, d, a, (long)in[13]+0x4e0811a1, 21);
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MD5STEP(F4, a, b, c, d, (long)in[ 4]+0xf7537e82, 6);
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MD5STEP(F4, d, a, b, c, (long)in[11]+0xbd3af235, 10);
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MD5STEP(F4, c, d, a, b, (long)in[ 2]+0x2ad7d2bb, 15);
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MD5STEP(F4, b, c, d, a, (long)in[ 9]+0xeb86d391, 21);
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/*
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* we have 4 unsigned longs generated by the above sequence; this scrambles
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* them together so that if there is any pattern, it will be obscured.
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*/
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return (a ^ b ^ c ^ d);
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}
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