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

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

     1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

     2 /* This Source Code Form is subject to the terms of the Mozilla Public

     3  * License, v. 2.0. If a copy of the MPL was not distributed with this

     4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     7 #include "primpl.h"

     9 #include <string.h>

    10 #include <unistd.h>

    11 #include <errno.h>

    12 #include <sys/time.h>

    15 #if defined(SOLARIS)

    17 static size_t

    18 GetHighResClock(void *buf, size_t maxbytes)

    19 {

    20     hrtime_t t;

    21     t = gethrtime();

    22     if (t) {

    23 	    return _pr_CopyLowBits(buf, maxbytes, &t, sizeof(t));

    24     }

    25     return 0;

    26 }

    28 #elif defined(HPUX)

    30 #ifdef __ia64

    31 #include <ia64/sys/inline.h>

    33 static size_t

    34 GetHighResClock(void *buf, size_t maxbytes)

    35 {

    36     PRUint64 t;

    38 #ifdef __GNUC__

    39     __asm__ __volatile__("mov %0 = ar.itc" : "=r" (t));

    40 #else

    41     t = _Asm_mov_from_ar(_AREG44);

    42 #endif

    43     return _pr_CopyLowBits(buf, maxbytes, &t, sizeof(t));

    44 }

    45 #else

    46 static size_t

    47 GetHighResClock(void *buf, size_t maxbytes)

    48 {

    49     extern int ret_cr16();

    50     int cr16val;

    52     cr16val = ret_cr16();

    53     return(_pr_CopyLowBits(buf, maxbytes, &cr16val, sizeof(cr16val)));

    54 }

    55 #endif

    57 #elif defined(OSF1)

    59 #include <c_asm.h>

    61 /*

    62  * Use the "get the cycle counter" instruction on the alpha.

    63  * The low 32 bits completely turn over in less than a minute.

    64  * The high 32 bits are some non-counter gunk that changes sometimes.

    65  */

    66 static size_t

    67 GetHighResClock(void *buf, size_t maxbytes)

    68 {

    69     unsigned long t;

    71 #ifdef __GNUC__

    72     __asm__("rpcc %0" : "=r" (t));

    73 #else

    74     t = asm("rpcc %v0");

    75 #endif

    76     return _pr_CopyLowBits(buf, maxbytes, &t, sizeof(t));

    77 }

    79 #elif defined(AIX)

    81 static size_t

    82 GetHighResClock(void *buf, size_t maxbytes)

    83 {

    84     return 0;

    85 }

    87 #elif (defined(LINUX) || defined(FREEBSD) || defined(__FreeBSD_kernel__) \

    88     || defined(NETBSD) || defined(__NetBSD_kernel__) || defined(OPENBSD) \

    89     || defined(SYMBIAN) || defined(__GNU__))

    90 #include <sys/types.h>

    91 #include <sys/stat.h>

    92 #include <fcntl.h>

    94 static int      fdDevURandom;

    95 static PRCallOnceType coOpenDevURandom;

    97 static PRStatus OpenDevURandom( void )

    98 {

    99     fdDevURandom = open( "/dev/urandom", O_RDONLY );

   100     return((-1 == fdDevURandom)? PR_FAILURE : PR_SUCCESS );

   101 } /* end OpenDevURandom() */

   103 static size_t GetDevURandom( void *buf, size_t size )

   104 {

   105     int bytesIn;

   106     int rc;

   108     rc = PR_CallOnce( &coOpenDevURandom, OpenDevURandom );

   109     if ( PR_FAILURE == rc ) {

   110         _PR_MD_MAP_OPEN_ERROR( errno );

   111         return(0);

   112     }

   114     bytesIn = read( fdDevURandom, buf, size );

   115     if ( -1 == bytesIn ) {

   116         _PR_MD_MAP_READ_ERROR( errno );

   117         return(0);

   118     }

   120     return( bytesIn );

   121 } /* end GetDevURandom() */

   123 static size_t

   124 GetHighResClock(void *buf, size_t maxbytes)

   125 {

   126     return(GetDevURandom( buf, maxbytes ));

   127 }

   129 #elif defined(IRIX)

   130 #include <fcntl.h>

   131 #undef PRIVATE

   132 #include <sys/mman.h>

   133 #include <sys/syssgi.h>

   134 #include <sys/immu.h>

   135 #include <sys/systeminfo.h>

   136 #include <sys/utsname.h>

   138 static size_t GetHighResClock(void *buf, size_t maxbuf)

   139 {

   140     unsigned phys_addr, raddr, cycleval;

   141     static volatile unsigned *iotimer_addr = NULL;

   142     static int tries = 0;

   143     static int cntr_size;

   144     int mfd;

   145     unsigned s0[2];

   147 #ifndef SGI_CYCLECNTR_SIZE

   148 #define SGI_CYCLECNTR_SIZE      165     /* Size user needs to use to read CC */

   149 #endif

   151     if (iotimer_addr == NULL) {

   152 	    if (tries++ > 1) {

   153 	        /* Don't keep trying if it didn't work */

   154 	        return 0;

   155 	    }

   157 	    /*

   158 	    ** For SGI machines we can use the cycle counter, if it has one,

   159 	    ** to generate some truly random numbers

   160 	    */

   161 	    phys_addr = syssgi(SGI_QUERY_CYCLECNTR, &cycleval);

   162 	    if (phys_addr) {

   163 	        int pgsz = getpagesize();

   164 	        int pgoffmask = pgsz - 1;

   166 	        raddr = phys_addr & ~pgoffmask;

   167 	        mfd = open("/dev/mmem", O_RDONLY);

   168 	        if (mfd < 0) {

   169     		    return 0;

   170 	        }

   171 	        iotimer_addr = (unsigned *)

   172 		    mmap(0, pgoffmask, PROT_READ, MAP_PRIVATE, mfd, (int)raddr);

   173 	        if (iotimer_addr == (unsigned*)-1) {

   174 	    	    close(mfd);

   175 		        iotimer_addr = NULL;

   176 		        return 0;

   177 	        }

   178 	        iotimer_addr = (unsigned*)

   179 		    ((__psint_t)iotimer_addr | (phys_addr & pgoffmask));

   180 	        /*

   181 	         * The file 'mfd' is purposefully not closed.

   182 	         */

   183 	        cntr_size = syssgi(SGI_CYCLECNTR_SIZE);

   184 	        if (cntr_size < 0) {

   185     		    struct utsname utsinfo;

   187 		        /*

   188 		         * We must be executing on a 6.0 or earlier system, since the

   189 		         * SGI_CYCLECNTR_SIZE call is not supported.

   190 		         *

   191 		         * The only pre-6.1 platforms with 64-bit counters are

   192 		         * IP19 and IP21 (Challenge, PowerChallenge, Onyx).

   193 		         */

   194 		        uname(&utsinfo);

   195 		        if (!strncmp(utsinfo.machine, "IP19", 4) ||

   196 		            !strncmp(utsinfo.machine, "IP21", 4))

   197 			        cntr_size = 64;

   198 		        else

   199 			        cntr_size = 32;

   200 	        }

   201 	        cntr_size /= 8;	/* Convert from bits to bytes */

   202 	    }

   203     }

   205     s0[0] = *iotimer_addr;

   206     if (cntr_size > 4)

   207 	s0[1] = *(iotimer_addr + 1);

   208     memcpy(buf, (char *)&s0[0], cntr_size);

   209     return _pr_CopyLowBits(buf, maxbuf, &s0, cntr_size);

   210 }

   212 #elif defined(SCO) || defined(UNIXWARE) || defined(BSDI) || defined(NTO) \

   213     || defined(QNX) || defined(DARWIN) || defined(RISCOS)

   214 #include <sys/times.h>

   216 static size_t

   217 GetHighResClock(void *buf, size_t maxbytes)

   218 {

   219     int ticks;

   220     struct tms buffer;

   222     ticks=times(&buffer);

   223     return _pr_CopyLowBits(buf, maxbytes, &ticks, sizeof(ticks));

   224 }

   225 #else

   226 #error! Platform undefined

   227 #endif /* defined(SOLARIS) */

   229 extern PRSize _PR_MD_GetRandomNoise( void *buf, PRSize size )

   230 {

   231     struct timeval tv;

   232     int n = 0;

   233     int s;

   235     n += GetHighResClock(buf, size);

   236     size -= n;

   238     GETTIMEOFDAY(&tv);

   240     if ( size > 0 ) {

   241         s = _pr_CopyLowBits((char*)buf+n, size, &tv.tv_usec, sizeof(tv.tv_usec));

   242         size -= s;

   243         n += s;

   244     }

   245     if ( size > 0 ) {

   246         s = _pr_CopyLowBits((char*)buf+n, size, &tv.tv_sec, sizeof(tv.tv_usec));

   247         size -= s;

   248         n += s;

   249     }

   251     return n;

   252 } /* end _PR_MD_GetRandomNoise() */

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