1635c221b7
adding (weak definitions to) stubs for some of the pthread functions. If the threads library is linked in, the real pthread functions will pulled in. Use the following convention for system calls wrapped by the threads library: __sys_foo - actual system call _foo - weak definition to __sys_foo foo - weak definition to __sys_foo Change all libc uses of system calls wrapped by the threads library from foo to _foo. In order to define the prototypes for _foo(), we introduce namespace.h and un-namespace.h (suggested by bde). All files that need to reference these system calls, should include namespace.h before any standard includes, then include un-namespace.h after the standard includes and before any local includes. <db.h> is an exception and shouldn't be included in between namespace.h and un-namespace.h namespace.h will define foo to _foo, and un-namespace.h will undefine foo. Try to eliminate some of the recursive calls to MT-safe functions in libc/stdio in preparation for adding a mutex to FILE. We have recursive mutexes, but would like to avoid using them if possible. Remove uneeded includes of <errno.h> from a few files. Add $FreeBSD$ to a few files in order to pass commitprep. Approved by: -arch
175 lines
3.3 KiB
C
175 lines
3.3 KiB
C
/* $FreeBSD$ */
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/*
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* Arc4 random number generator for OpenBSD.
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* Copyright 1996 David Mazieres <dm@lcs.mit.edu>.
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*
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* Modification and redistribution in source and binary forms is
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* permitted provided that due credit is given to the author and the
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* OpenBSD project (for instance by leaving this copyright notice
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* intact).
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*/
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/*
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* This code is derived from section 17.1 of Applied Cryptography,
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* second edition, which describes a stream cipher allegedly
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* compatible with RSA Labs "RC4" cipher (the actual description of
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* which is a trade secret). The same algorithm is used as a stream
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* cipher called "arcfour" in Tatu Ylonen's ssh package.
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*
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* Here the stream cipher has been modified always to include the time
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* when initializing the state. That makes it impossible to
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* regenerate the same random sequence twice, so this can't be used
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* for encryption, but will generate good random numbers.
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*
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* RC4 is a registered trademark of RSA Laboratories.
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*/
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#include "namespace.h"
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#include <stdlib.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/time.h>
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#include "un-namespace.h"
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struct arc4_stream {
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u_int8_t i;
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u_int8_t j;
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u_int8_t s[256];
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};
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static int rs_initialized;
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static struct arc4_stream rs;
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static inline void
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arc4_init(as)
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struct arc4_stream *as;
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{
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int n;
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for (n = 0; n < 256; n++)
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as->s[n] = n;
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as->i = 0;
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as->j = 0;
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}
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static inline void
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arc4_addrandom(as, dat, datlen)
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struct arc4_stream *as;
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u_char *dat;
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int datlen;
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{
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int n;
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u_int8_t si;
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as->i--;
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for (n = 0; n < 256; n++) {
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as->i = (as->i + 1);
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si = as->s[as->i];
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as->j = (as->j + si + dat[n % datlen]);
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as->s[as->i] = as->s[as->j];
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as->s[as->j] = si;
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}
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}
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static void
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arc4_stir(as)
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struct arc4_stream *as;
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{
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int fd;
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struct {
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struct timeval tv;
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pid_t pid;
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u_int8_t rnd[128 - sizeof(struct timeval) - sizeof(pid_t)];
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} rdat;
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gettimeofday(&rdat.tv, NULL);
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rdat.pid = getpid();
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fd = _open("/dev/urandom", O_RDONLY, 0);
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if (fd >= 0) {
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(void) _read(fd, rdat.rnd, sizeof(rdat.rnd));
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_close(fd);
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}
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/* fd < 0? Ah, what the heck. We'll just take whatever was on the
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* stack... */
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arc4_addrandom(as, (void *) &rdat, sizeof(rdat));
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}
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static inline u_int8_t
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arc4_getbyte(as)
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struct arc4_stream *as;
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{
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u_int8_t si, sj;
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as->i = (as->i + 1);
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si = as->s[as->i];
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as->j = (as->j + si);
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sj = as->s[as->j];
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as->s[as->i] = sj;
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as->s[as->j] = si;
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return (as->s[(si + sj) & 0xff]);
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}
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static inline u_int32_t
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arc4_getword(as)
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struct arc4_stream *as;
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{
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u_int32_t val;
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val = arc4_getbyte(as) << 24;
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val |= arc4_getbyte(as) << 16;
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val |= arc4_getbyte(as) << 8;
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val |= arc4_getbyte(as);
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return val;
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}
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void
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arc4random_stir()
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{
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if (!rs_initialized) {
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arc4_init(&rs);
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rs_initialized = 1;
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}
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arc4_stir(&rs);
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}
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void
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arc4random_addrandom(dat, datlen)
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u_char *dat;
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int datlen;
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{
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if (!rs_initialized)
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arc4random_stir();
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arc4_addrandom(&rs, dat, datlen);
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}
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u_int32_t
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arc4random()
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{
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if (!rs_initialized)
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arc4random_stir();
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return arc4_getword(&rs);
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}
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#if 0
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/*-------- Test code for i386 --------*/
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#include <stdio.h>
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#include <machine/pctr.h>
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int
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main(int argc, char **argv)
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{
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const int iter = 1000000;
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int i;
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pctrval v;
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v = rdtsc();
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for (i = 0; i < iter; i++)
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arc4random();
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v = rdtsc() - v;
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v /= iter;
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printf("%qd cycles\n", v);
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}
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#endif
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