From ad89bf7894e705a7e174cfa6c696a0b8f546a663 Mon Sep 17 00:00:00 2001 From: "Dr. Stephen Henson" Date: Mon, 19 Dec 2011 17:01:37 +0000 Subject: [PATCH] PR: 2563 Submitted by: Paul Green Reviewed by: steve Improved PRNG seeding for VOS. --- CHANGES | 3 ++ Configure | 4 +- crypto/rand/rand_unix.c | 108 +++++++++++++++++++++++++++------------- e_os2.h | 8 ++- 4 files changed, 86 insertions(+), 37 deletions(-) diff --git a/CHANGES b/CHANGES index 5d544d8348..66f3928b88 100644 --- a/CHANGES +++ b/CHANGES @@ -255,6 +255,9 @@ Changes between 1.0.0f and 1.0.1 [xx XXX xxxx] + *) Improved PRNG seeding for VOS. + [Paul Green ] + *) Extensive assembler packs updates, most notably: - x86[_64]: AES-NI, PCLMULQDQ, RDRAND support; diff --git a/Configure b/Configure index 915c06857f..75bd162f33 100755 --- a/Configure +++ b/Configure @@ -200,8 +200,8 @@ my %table=( "cc", "cc:-O::(unknown)::::::", ####VOS Configurations -"vos-gcc","gcc:-O3 -Wall -D_POSIX_C_SOURCE=200112L -D_BSD -D_VOS_EXTENDED_NAMES -DB_ENDIAN::(unknown):VOS:-Wl,-map:BN_LLONG:${no_asm}:::::.so:", -"debug-vos-gcc","gcc:-O0 -g -Wall -D_POSIX_C_SOURCE=200112L -D_BSD -D_VOS_EXTENDED_NAMES -DB_ENDIAN -DBN_DEBUG -DREF_CHECK -DCONF_DEBUG -DCRYPTO_MDEBUG::(unknown):VOS:-Wl,-map:BN_LLONG:${no_asm}:::::.so:", +"vos-gcc","gcc:-O3 -Wall -DOPENSSL_SYSNAME_VOS -D_POSIX_C_SOURCE=200112L -D_BSD -D_VOS_EXTENDED_NAMES -DB_ENDIAN::(unknown):VOS:-Wl,-map:BN_LLONG:${no_asm}:::::.so:", +"debug-vos-gcc","gcc:-O0 -g -Wall -DOPENSSL_SYSNAME_VOS -D_POSIX_C_SOURCE=200112L -D_BSD -D_VOS_EXTENDED_NAMES -DB_ENDIAN -DBN_DEBUG -DREF_CHECK -DCONF_DEBUG -DCRYPTO_MDEBUG::(unknown):VOS:-Wl,-map:BN_LLONG:${no_asm}:::::.so:", #### Solaris x86 with GNU C setups # -DOPENSSL_NO_INLINE_ASM switches off inline assembler. We have to do it diff --git a/crypto/rand/rand_unix.c b/crypto/rand/rand_unix.c index e9ead3a529..e3a65571c8 100644 --- a/crypto/rand/rand_unix.c +++ b/crypto/rand/rand_unix.c @@ -133,47 +133,87 @@ # define FD_SETSIZE (8*sizeof(fd_set)) #endif -#ifdef __VOS__ +#if defined(OPENSSL_SYS_VOS) + +/* The following algorithm repeatedly samples the real-time clock + (RTC) to generate a sequence of unpredictable data. The algorithm + relies upon the uneven execution speed of the code (due to factors + such as cache misses, interrupts, bus activity, and scheduling) and + upon the rather large relative difference between the speed of the + clock and the rate at which it can be read. + + If this code is ported to an environment where execution speed is + more constant or where the RTC ticks at a much slower rate, or the + clock can be read with fewer instructions, it is likely that the + results would be far more predictable. + + As a precaution, we generate 4 times the minimum required amount of + seed data. */ + int RAND_poll(void) { - unsigned char buf[ENTROPY_NEEDED]; + short int code; + gid_t curr_gid; pid_t curr_pid; uid_t curr_uid; - static int first=1; - int i; - long rnd = 0; + int i, k; struct timespec ts; - unsigned seed; - -/* The VOS random() function starts from a static seed so its - initial value is predictable. If random() returns the - initial value, reseed it with dynamic data. The VOS - real-time clock has a granularity of 1 nsec so it should be - reasonably difficult to predict its exact value. Do not - gratuitously reseed the PRNG because other code in this - process or thread may be using it. */ - - if (first) { - first = 0; - rnd = random (); - if (rnd == 1804289383) { - clock_gettime (CLOCK_REALTIME, &ts); - curr_pid = getpid(); - curr_uid = getuid(); - seed = ts.tv_sec ^ ts.tv_nsec ^ curr_pid ^ curr_uid; - srandom (seed); - } - } + unsigned char v; - for (i = 0; i < sizeof(buf); i++) { - if (i % 4 == 0) - rnd = random(); - buf[i] = rnd; - rnd >>= 8; - } - RAND_add(buf, sizeof(buf), ENTROPY_NEEDED); - memset(buf, 0, sizeof(buf)); +#ifdef OPENSSL_SYS_VOS_HPPA + long duration; + extern void s$sleep (long *_duration, short int *_code); +#else +#ifdef OPENSSL_SYS_VOS_IA32 + long long duration; + extern void s$sleep2 (long long *_duration, short int *_code); +#else +#error "Unsupported Platform." +#endif /* OPENSSL_SYS_VOS_IA32 */ +#endif /* OPENSSL_SYS_VOS_HPPA */ + + /* Seed with the gid, pid, and uid, to ensure *some* + variation between different processes. */ + + curr_gid = getgid(); + RAND_add (&curr_gid, sizeof curr_gid, 1); + curr_gid = 0; + + curr_pid = getpid(); + RAND_add (&curr_pid, sizeof curr_pid, 1); + curr_pid = 0; + + curr_uid = getuid(); + RAND_add (&curr_uid, sizeof curr_uid, 1); + curr_uid = 0; + for (i=0; i<(ENTROPY_NEEDED*4); i++) + { + /* burn some cpu; hope for interrupts, cache + collisions, bus interference, etc. */ + for (k=0; k<99; k++) + ts.tv_nsec = random (); + +#ifdef OPENSSL_SYS_VOS_HPPA + /* sleep for 1/1024 of a second (976 us). */ + duration = 1; + s$sleep (&duration, &code); +#else +#ifdef OPENSSL_SYS_VOS_IA32 + /* sleep for 1/65536 of a second (15 us). */ + duration = 1; + s$sleep2 (&duration, &code); +#endif /* OPENSSL_SYS_VOS_IA32 */ +#endif /* OPENSSL_SYS_VOS_HPPA */ + + /* get wall clock time. */ + clock_gettime (CLOCK_REALTIME, &ts); + + /* take 8 bits */ + v = (unsigned char) (ts.tv_nsec % 256); + RAND_add (&v, sizeof v, 1); + v = 0; + } return 1; } #elif defined __OpenBSD__ diff --git a/e_os2.h b/e_os2.h index 405b51fcec..f4597a2c67 100644 --- a/e_os2.h +++ b/e_os2.h @@ -193,8 +193,14 @@ extern "C" { #endif /* --------------------------------- VOS ----------------------------------- */ -#ifdef OPENSSL_SYSNAME_VOS +#if defined(__VOS__) || defined(OPENSSL_SYSNAME_VOS) # define OPENSSL_SYS_VOS +#ifdef __HPPA__ +# define OPENSSL_SYS_VOS_HPPA +#endif +#ifdef __IA32__ +# define OPENSSL_SYS_VOS_IA32 +#endif #endif /* ------------------------------- VxWorks --------------------------------- */ -- 2.25.1