diff options
Diffstat (limited to 'keyexchange/isakmpd-20041012/sysdep/common/libsysdep/arc4random.c')
| -rw-r--r-- | keyexchange/isakmpd-20041012/sysdep/common/libsysdep/arc4random.c | 178 |
1 files changed, 0 insertions, 178 deletions
diff --git a/keyexchange/isakmpd-20041012/sysdep/common/libsysdep/arc4random.c b/keyexchange/isakmpd-20041012/sysdep/common/libsysdep/arc4random.c deleted file mode 100644 index afd5bb6..0000000 --- a/keyexchange/isakmpd-20041012/sysdep/common/libsysdep/arc4random.c +++ /dev/null @@ -1,178 +0,0 @@ -/* $OpenBSD: arc4random.c,v 1.6 2004/10/08 15:18:26 hshoexer Exp $ */ - -/* - * Arc4 random number generator for OpenBSD. - * Copyright 1996 David Mazieres <dm@lcs.mit.edu>. - * - * Modification and redistribution in source and binary forms is - * permitted provided that due credit is given to the author and the - * OpenBSD project by leaving this copyright notice intact. - */ - -/* - * This code is derived from section 17.1 of Applied Cryptography, - * second edition, which describes a stream cipher allegedly - * compatible with RSA Labs "RC4" cipher (the actual description of - * which is a trade secret). The same algorithm is used as a stream - * cipher called "arcfour" in Tatu Ylonen's ssh package. - * - * Here the stream cipher has been modified always to include the time - * when initializing the state. That makes it impossible to - * regenerate the same random sequence twice, so this can't be used - * for encryption, but will generate good random numbers. - * - * RC4 is a registered trademark of RSA Laboratories. - */ - -#include <fcntl.h> -#include <stdlib.h> -#include <unistd.h> -#include <sys/types.h> -#include <sys/time.h> - -#ifdef __GNUC__ -#define inline __inline -#else /* !__GNUC__ */ -#define inline -#endif /* !__GNUC__ */ - -struct arc4_stream { - u_int8_t i; - u_int8_t j; - u_int8_t s[256]; -}; - -int rs_initialized; -static struct arc4_stream rs; - -static inline u_int8_t arc4_getbyte(struct arc4_stream *); - -static inline void -arc4_init(struct arc4_stream *as) -{ - int n; - - for (n = 0; n < 256; n++) - as->s[n] = n; - as->i = 0; - as->j = 0; -} - -static inline void -arc4_addrandom(struct arc4_stream *as, u_char *dat, int datlen) -{ - int n; - u_int8_t si; - - as->i--; - for (n = 0; n < 256; n++) { - as->i = (as->i + 1); - si = as->s[as->i]; - as->j = (as->j + si + dat[n % datlen]); - as->s[as->i] = as->s[as->j]; - as->s[as->j] = si; - } - as->j = as->i; -} - -static void -arc4_stir(struct arc4_stream *as) -{ - int fd, i; - struct { - struct timeval tv; - u_int8_t rnd[128 - sizeof(struct timeval)]; - } rdat; - - gettimeofday(&rdat.tv, NULL); - fd = open("/dev/arandom", O_RDONLY); - if (fd < 0) - fd = open("/dev/random", O_RDONLY); - if (fd >= 0) { - read(fd, rdat.rnd, sizeof(rdat.rnd)); - close(fd); - } - /* fd < 0? Ah, what the heck. We'll just take whatever was on the - * stack... */ - - arc4_addrandom(as, (void *)&rdat, sizeof(rdat)); - - /* - * Discard early keystream, as per recommendations in: - * http://www.wisdom.weizmann.ac.il/~itsik/RC4/Papers/Rc4_ksa.ps - */ - for (i = 0; i < 256; i++) - (void)arc4_getbyte(as); -} - -static inline u_int8_t -arc4_getbyte(struct arc4_stream *as) -{ - u_int8_t si, sj; - - as->i = (as->i + 1); - si = as->s[as->i]; - as->j = (as->j + si); - sj = as->s[as->j]; - as->s[as->i] = sj; - as->s[as->j] = si; - return (as->s[(si + sj) & 0xff]); -} - -static inline u_int32_t -arc4_getword(struct arc4_stream *as) -{ - u_int32_t val; - val = arc4_getbyte(as) << 24; - val |= arc4_getbyte(as) << 16; - val |= arc4_getbyte(as) << 8; - val |= arc4_getbyte(as); - return val; -} - -void -arc4random_stir(void) -{ - if (!rs_initialized) { - arc4_init(&rs); - rs_initialized = 1; - } - arc4_stir(&rs); -} - -void -arc4random_addrandom(u_char *dat, int datlen) -{ - if (!rs_initialized) - arc4random_stir(); - arc4_addrandom(&rs, dat, datlen); -} - -u_int32_t -arc4random(void) -{ - if (!rs_initialized) - arc4random_stir(); - return arc4_getword(&rs); -} - -#if 0 -/*-------- Test code for i386 --------*/ -#include <stdio.h> -#include <machine/pctr.h> -int -main(int argc, char **argv) -{ - const int iter = 1000000; - int i; - pctrval v; - - v = rdtsc(); - for (i = 0; i < iter; i++) - arc4random(); - v = rdtsc() - v; - v /= iter; - - printf("%qd cycles\n", v); -} -#endif |