--- /dev/null
+/*
+ * IRC - Internet Relay Chat, ircd/random.c
+ *
+ * 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; either version 1, or (at your option)
+ * any later version.
+ *
+ * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include "sys.h"
+#include <stdlib.h>
+#include <stdio.h>
+#include "random.h"
+
+RCSTAG_CC("$Id$");
+
+char localkey[9] = RANDOM_SEED;
+
+/*
+ * MD5 transform algorithm, taken from code written by Colin Plumb,
+ * and put into the public domain
+ *
+ * Kev: Taken from Ted T'so's /dev/random random.c code and modified to
+ * be slightly simpler. That code is released under a BSD-style copyright
+ * OR under the terms of the GNU Public License, which should be included
+ * at the top of this source file.
+ *
+ * record: Cleaned up to work with ircd. RANDOM_TOKEN is defined in
+ * setup.h by the make script; if people start to "guess" your cookies,
+ * consider recompiling your server with a different random token.
+ */
+
+/* The four core functions - F1 is optimized somewhat */
+
+#define F1(x, y, z) (z ^ (x & (y ^ z)))
+#define F2(x, y, z) F1(z, x, y)
+#define F3(x, y, z) (x ^ y ^ z)
+#define F4(x, y, z) (y ^ (x | ~z))
+
+/* This is the central step in the MD5 algorithm. */
+#define MD5STEP(f, w, x, y, z, data, s) \
+ ( w += f(x, y, z) + data, w = w<<s | w>>(32-s), w += x )
+
+/*
+ * The core of the MD5 algorithm, this alters an existing MD5 hash to
+ * reflect the addition of 16 longwords of new data. MD5Update blocks
+ * the data and converts bytes into longwords for this routine.
+ *
+ * original comment left in; this used to be called MD5Transform and took
+ * two arguments; I've internalized those arguments, creating the character
+ * array "localkey," which should contain 8 bytes of data. The function also
+ * originally returned nothing; now it returns an unsigned long that is the
+ * random number. It appears to be reallyrandom, so... -Kev
+ *
+ * I don't really know what this does. I tried to figure it out and got
+ * a headache. If you know what's good for you, you'll leave this stuff
+ * for the smart people and do something else. -record
+ */
+unsigned int ircrandom(void)
+{
+ unsigned int a, b, c, d;
+ unsigned char in[16];
+ struct timeval tv;
+
+ gettimeofday(&tv, NULL);
+
+ memcpy((void *)in, (void *)localkey, 8);
+ memcpy((void *)(in + 8), (void *)&tv.tv_sec, 4);
+ memcpy((void *)(in + 12), (void *)&tv.tv_usec, 4);
+
+ a = 0x67452301;
+ b = 0xefcdab89;
+ c = 0x98badcfe;
+ d = 0x10325476;
+
+ MD5STEP(F1, a, b, c, d, (int)in[0] + 0xd76aa478, 7);
+ MD5STEP(F1, d, a, b, c, (int)in[1] + 0xe8c7b756, 12);
+ MD5STEP(F1, c, d, a, b, (int)in[2] + 0x242070db, 17);
+ MD5STEP(F1, b, c, d, a, (int)in[3] + 0xc1bdceee, 22);
+ MD5STEP(F1, a, b, c, d, (int)in[4] + 0xf57c0faf, 7);
+ MD5STEP(F1, d, a, b, c, (int)in[5] + 0x4787c62a, 12);
+ MD5STEP(F1, c, d, a, b, (int)in[6] + 0xa8304613, 17);
+ MD5STEP(F1, b, c, d, a, (int)in[7] + 0xfd469501, 22);
+ MD5STEP(F1, a, b, c, d, (int)in[8] + 0x698098d8, 7);
+ MD5STEP(F1, d, a, b, c, (int)in[9] + 0x8b44f7af, 12);
+ MD5STEP(F1, c, d, a, b, (int)in[10] + 0xffff5bb1, 17);
+ MD5STEP(F1, b, c, d, a, (int)in[11] + 0x895cd7be, 22);
+ MD5STEP(F1, a, b, c, d, (int)in[12] + 0x6b901122, 7);
+ MD5STEP(F1, d, a, b, c, (int)in[13] + 0xfd987193, 12);
+ MD5STEP(F1, c, d, a, b, (int)in[14] + 0xa679438e, 17);
+ MD5STEP(F1, b, c, d, a, (int)in[15] + 0x49b40821, 22);
+
+ MD5STEP(F2, a, b, c, d, (int)in[1] + 0xf61e2562, 5);
+ MD5STEP(F2, d, a, b, c, (int)in[6] + 0xc040b340, 9);
+ MD5STEP(F2, c, d, a, b, (int)in[11] + 0x265e5a51, 14);
+ MD5STEP(F2, b, c, d, a, (int)in[0] + 0xe9b6c7aa, 20);
+ MD5STEP(F2, a, b, c, d, (int)in[5] + 0xd62f105d, 5);
+ MD5STEP(F2, d, a, b, c, (int)in[10] + 0x02441453, 9);
+ MD5STEP(F2, c, d, a, b, (int)in[15] + 0xd8a1e681, 14);
+ MD5STEP(F2, b, c, d, a, (int)in[4] + 0xe7d3fbc8, 20);
+ MD5STEP(F2, a, b, c, d, (int)in[9] + 0x21e1cde6, 5);
+ MD5STEP(F2, d, a, b, c, (int)in[14] + 0xc33707d6, 9);
+ MD5STEP(F2, c, d, a, b, (int)in[3] + 0xf4d50d87, 14);
+ MD5STEP(F2, b, c, d, a, (int)in[8] + 0x455a14ed, 20);
+ MD5STEP(F2, a, b, c, d, (int)in[13] + 0xa9e3e905, 5);
+ MD5STEP(F2, d, a, b, c, (int)in[2] + 0xfcefa3f8, 9);
+ MD5STEP(F2, c, d, a, b, (int)in[7] + 0x676f02d9, 14);
+ MD5STEP(F2, b, c, d, a, (int)in[12] + 0x8d2a4c8a, 20);
+
+ MD5STEP(F3, a, b, c, d, (int)in[5] + 0xfffa3942, 4);
+ MD5STEP(F3, d, a, b, c, (int)in[8] + 0x8771f681, 11);
+ MD5STEP(F3, c, d, a, b, (int)in[11] + 0x6d9d6122, 16);
+ MD5STEP(F3, b, c, d, a, (int)in[14] + 0xfde5380c, 23);
+ MD5STEP(F3, a, b, c, d, (int)in[1] + 0xa4beea44, 4);
+ MD5STEP(F3, d, a, b, c, (int)in[4] + 0x4bdecfa9, 11);
+ MD5STEP(F3, c, d, a, b, (int)in[7] + 0xf6bb4b60, 16);
+ MD5STEP(F3, b, c, d, a, (int)in[10] + 0xbebfbc70, 23);
+ MD5STEP(F3, a, b, c, d, (int)in[13] + 0x289b7ec6, 4);
+ MD5STEP(F3, d, a, b, c, (int)in[0] + 0xeaa127fa, 11);
+ MD5STEP(F3, c, d, a, b, (int)in[3] + 0xd4ef3085, 16);
+ MD5STEP(F3, b, c, d, a, (int)in[6] + 0x04881d05, 23);
+ MD5STEP(F3, a, b, c, d, (int)in[9] + 0xd9d4d039, 4);
+ MD5STEP(F3, d, a, b, c, (int)in[12] + 0xe6db99e5, 11);
+ MD5STEP(F3, c, d, a, b, (int)in[15] + 0x1fa27cf8, 16);
+ MD5STEP(F3, b, c, d, a, (int)in[2] + 0xc4ac5665, 23);
+
+ MD5STEP(F4, a, b, c, d, (int)in[0] + 0xf4292244, 6);
+ MD5STEP(F4, d, a, b, c, (int)in[7] + 0x432aff97, 10);
+ MD5STEP(F4, c, d, a, b, (int)in[14] + 0xab9423a7, 15);
+ MD5STEP(F4, b, c, d, a, (int)in[5] + 0xfc93a039, 21);
+ MD5STEP(F4, a, b, c, d, (int)in[12] + 0x655b59c3, 6);
+ MD5STEP(F4, d, a, b, c, (int)in[3] + 0x8f0ccc92, 10);
+ MD5STEP(F4, c, d, a, b, (int)in[10] + 0xffeff47d, 15);
+ MD5STEP(F4, b, c, d, a, (int)in[1] + 0x85845dd1, 21);
+ MD5STEP(F4, a, b, c, d, (int)in[8] + 0x6fa87e4f, 6);
+ MD5STEP(F4, d, a, b, c, (int)in[15] + 0xfe2ce6e0, 10);
+ MD5STEP(F4, c, d, a, b, (int)in[6] + 0xa3014314, 15);
+ MD5STEP(F4, b, c, d, a, (int)in[13] + 0x4e0811a1, 21);
+ MD5STEP(F4, a, b, c, d, (int)in[4] + 0xf7537e82, 6);
+ MD5STEP(F4, d, a, b, c, (int)in[11] + 0xbd3af235, 10);
+ MD5STEP(F4, c, d, a, b, (int)in[2] + 0x2ad7d2bb, 15);
+ MD5STEP(F4, b, c, d, a, (int)in[9] + 0xeb86d391, 21);
+
+ /*
+ * We have 4 unsigned longs generated by the above sequence; this scrambles
+ * them together so that if there is any pattern, it will be obscured.
+ */
+ return (a ^ b ^ c ^ d);
+}
projects / ircu2.10.12-pk.git / blobdiff