The Tor Browser: nsprpub/pr/src/md/unix/uxrng.c@6474c204b198 (annotated)

nsprpub/pr/src/md/unix/uxrng.c@6474c204b198 (annotated)

nsprpub/pr/src/md/unix/uxrng.c

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 #include "primpl.h"
 #include <string.h>
 #include <unistd.h>
 #include <errno.h>
 #include <sys/time.h>
 #if defined(SOLARIS)
 static size_t
 GetHighResClock(void *buf, size_t maxbytes)
 {
     hrtime_t t;
     t = gethrtime();
     if (t) {
 	    return _pr_CopyLowBits(buf, maxbytes, &t, sizeof(t));
     }
     return 0;
 }
 #elif defined(HPUX)
 #ifdef __ia64
 #include <ia64/sys/inline.h>
 static size_t
 GetHighResClock(void *buf, size_t maxbytes)
 {
     PRUint64 t;
 #ifdef __GNUC__
     __asm__ __volatile__("mov %0 = ar.itc" : "=r" (t));
 #else
     t = _Asm_mov_from_ar(_AREG44);
 #endif
     return _pr_CopyLowBits(buf, maxbytes, &t, sizeof(t));
 }
 #else
 static size_t
 GetHighResClock(void *buf, size_t maxbytes)
 {
     extern int ret_cr16();
     int cr16val;
     cr16val = ret_cr16();
     return(_pr_CopyLowBits(buf, maxbytes, &cr16val, sizeof(cr16val)));
 }
 #endif
 #elif defined(OSF1)
 #include <c_asm.h>
 /*
  * Use the "get the cycle counter" instruction on the alpha.
  * The low 32 bits completely turn over in less than a minute.
  * The high 32 bits are some non-counter gunk that changes sometimes.
  */
 static size_t
 GetHighResClock(void *buf, size_t maxbytes)
 {
     unsigned long t;
 #ifdef __GNUC__
     __asm__("rpcc %0" : "=r" (t));
 #else
     t = asm("rpcc %v0");
 #endif
     return _pr_CopyLowBits(buf, maxbytes, &t, sizeof(t));
 }
 #elif defined(AIX)
 static size_t
 GetHighResClock(void *buf, size_t maxbytes)
 {
     return 0;
 }
 #elif (defined(LINUX) || defined(FREEBSD) || defined(__FreeBSD_kernel__) \
     || defined(NETBSD) || defined(__NetBSD_kernel__) || defined(OPENBSD) \
     || defined(SYMBIAN) || defined(__GNU__))
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <fcntl.h>
 static int      fdDevURandom;
 static PRCallOnceType coOpenDevURandom;
 static PRStatus OpenDevURandom( void )
 {
     fdDevURandom = open( "/dev/urandom", O_RDONLY );
     return((-1 == fdDevURandom)? PR_FAILURE : PR_SUCCESS );
 } /* end OpenDevURandom() */
 static size_t GetDevURandom( void *buf, size_t size )
 {
     int bytesIn;
     int rc;
     rc = PR_CallOnce( &coOpenDevURandom, OpenDevURandom );
     if ( PR_FAILURE == rc ) {
         _PR_MD_MAP_OPEN_ERROR( errno );
         return(0);
     }
     bytesIn = read( fdDevURandom, buf, size );
     if ( -1 == bytesIn ) {
         _PR_MD_MAP_READ_ERROR( errno );
         return(0);
     }
     return( bytesIn );
 } /* end GetDevURandom() */
 static size_t
 GetHighResClock(void *buf, size_t maxbytes)
 {
     return(GetDevURandom( buf, maxbytes ));
 }
 #elif defined(IRIX)
 #include <fcntl.h>
 #undef PRIVATE
 #include <sys/mman.h>
 #include <sys/syssgi.h>
 #include <sys/immu.h>
 #include <sys/systeminfo.h>
 #include <sys/utsname.h>
 static size_t GetHighResClock(void *buf, size_t maxbuf)
 {
     unsigned phys_addr, raddr, cycleval;
     static volatile unsigned *iotimer_addr = NULL;
     static int tries = 0;
     static int cntr_size;
     int mfd;
     unsigned s0[2];
 #ifndef SGI_CYCLECNTR_SIZE
 #define SGI_CYCLECNTR_SIZE      165     /* Size user needs to use to read CC */
 #endif
     if (iotimer_addr == NULL) {
 	    if (tries++ > 1) {
 	        /* Don't keep trying if it didn't work */
 	        return 0;
 	    }
 	    /*
 	    ** For SGI machines we can use the cycle counter, if it has one,
 	    ** to generate some truly random numbers
 	    */
 	    phys_addr = syssgi(SGI_QUERY_CYCLECNTR, &cycleval);
 	    if (phys_addr) {
 	        int pgsz = getpagesize();
 	        int pgoffmask = pgsz - 1;
 	        raddr = phys_addr & ~pgoffmask;
 	        mfd = open("/dev/mmem", O_RDONLY);
 	        if (mfd < 0) {
     		    return 0;
 	        }
 	        iotimer_addr = (unsigned *)
 		    mmap(0, pgoffmask, PROT_READ, MAP_PRIVATE, mfd, (int)raddr);
 	        if (iotimer_addr == (unsigned*)-1) {
 	    	    close(mfd);
 		        iotimer_addr = NULL;
 		        return 0;
 	        }
 	        iotimer_addr = (unsigned*)
 		    ((__psint_t)iotimer_addr | (phys_addr & pgoffmask));
 	        /*
 	         * The file 'mfd' is purposefully not closed.
 	         */
 	        cntr_size = syssgi(SGI_CYCLECNTR_SIZE);
 	        if (cntr_size < 0) {
     		    struct utsname utsinfo;
 		        /*
 		         * We must be executing on a 6.0 or earlier system, since the
 		         * SGI_CYCLECNTR_SIZE call is not supported.
 		         *
 		         * The only pre-6.1 platforms with 64-bit counters are
 		         * IP19 and IP21 (Challenge, PowerChallenge, Onyx).
 		         */
 		        uname(&utsinfo);
 		        if (!strncmp(utsinfo.machine, "IP19", 4) ||
 		            !strncmp(utsinfo.machine, "IP21", 4))
 			        cntr_size = 64;
 		        else
 			        cntr_size = 32;
 	        }
 	        cntr_size /= 8;	/* Convert from bits to bytes */
 	    }
     }
     s0[0] = *iotimer_addr;
     if (cntr_size > 4)
 	s0[1] = *(iotimer_addr + 1);
     memcpy(buf, (char *)&s0[0], cntr_size);
     return _pr_CopyLowBits(buf, maxbuf, &s0, cntr_size);
 }
 #elif defined(SCO) || defined(UNIXWARE) || defined(BSDI) || defined(NTO) \
     || defined(QNX) || defined(DARWIN) || defined(RISCOS)
 #include <sys/times.h>
 static size_t
 GetHighResClock(void *buf, size_t maxbytes)
 {
     int ticks;
     struct tms buffer;
     ticks=times(&buffer);
     return _pr_CopyLowBits(buf, maxbytes, &ticks, sizeof(ticks));
 }
 #else
 #error! Platform undefined
 #endif /* defined(SOLARIS) */
 extern PRSize _PR_MD_GetRandomNoise( void *buf, PRSize size )
 {
     struct timeval tv;
     int n = 0;
     int s;
     n += GetHighResClock(buf, size);
     size -= n;
     GETTIMEOFDAY(&tv);
     if ( size > 0 ) {
         s = _pr_CopyLowBits((char*)buf+n, size, &tv.tv_usec, sizeof(tv.tv_usec));
         size -= s;
         n += s;
     }
     if ( size > 0 ) {
         s = _pr_CopyLowBits((char*)buf+n, size, &tv.tv_sec, sizeof(tv.tv_usec));
         size -= s;
         n += s;
     }
     return n;
 } /* end _PR_MD_GetRandomNoise() */

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nsprpub/pr/src/md/unix/uxrng.c@6474c204b198 (annotated)

nsprpub/pr/src/md/unix/uxrng.c