crypto/rand/rand_vms.c

   1 /*
   2  * Copyright 2001-2017 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the OpenSSL license (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include "e_os.h"
  11
  12 #if defined(OPENSSL_SYS_VMS)
  13 # include <openssl/rand.h>
  14 # include "internal/rand_int.h"
  15 # include "rand_lcl.h"
  16 # include <descrip.h>
  17 # include <jpidef.h>
  18 # include <ssdef.h>
  19 # include <starlet.h>
  20 # include <efndef>
  21 # ifdef __DECC
  22 #  pragma message disable DOLLARID
  23 # endif
  24
  25 # ifndef OPENSSL_RAND_SEED_OS
  26 #  error "Unsupported seeding method configured; must be os"
  27 # endif
  28
  29 /*
  30  * Use 32-bit pointers almost everywhere.  Define the type to which to cast a
  31  * pointer passed to an external function.
  32  */
  33 # if __INITIAL_POINTER_SIZE == 64
  34 #  define PTR_T __void_ptr64
  35 #  pragma pointer_size save
  36 #  pragma pointer_size 32
  37 # else
  38 #  define PTR_T void *
  39 # endif
  40
  41 static struct items_data_st {
  42     short length, code;         /* length is number of bytes */
  43 } items_data[] = {
  44     {4, JPI$_BUFIO},
  45     {4, JPI$_CPUTIM},
  46     {4, JPI$_DIRIO},
  47     {4, JPI$_IMAGECOUNT},
  48     {8, JPI$_LAST_LOGIN_I},
  49     {8, JPI$_LOGINTIM},
  50     {4, JPI$_PAGEFLTS},
  51     {4, JPI$_PID},
  52     {4, JPI$_PPGCNT},
  53     {4, JPI$_WSPEAK},
  54     {4, JPI$_FINALEXC},
  55     {0, 0}
  56 };
  57
  58 size_t rand_pool_acquire_entropy(RAND_POOL *pool)
  59 {
  60     /* determine the number of items in the JPI array */
  61     struct items_data_st item_entry;
  62     int item_entry_count = OSSL_NELEM(items_data);
  63     /* Create the JPI itemlist array to hold item_data content */
  64     struct {
  65         short length, code;
  66         int *buffer;
  67         int *retlen;
  68     } item[item_entry_count], *pitem;
  69     struct items_data_st *pitems_data;
  70     int data_buffer[(item_entry_count * 2) + 4]; /* 8 bytes per entry max */
  71     int iosb[2];
  72     int sys_time[2];
  73     int *ptr;
  74     int i, j ;
  75     int tmp_length   = 0;
  76     int total_length = 0;
  77
  78     /* Setup itemlist for GETJPI */
  79     pitems_data = items_data;
  80     for (pitem = item; pitems_data->length != 0; pitem++) {
  81         pitem->length = pitems_data->length;
  82         pitem->code   = pitems_data->code;
  83         pitem->buffer = &data_buffer[total_length];
  84         pitem->retlen = 0;
  85         /* total_length is in longwords */
  86         total_length += pitems_data->length / 4;
  87         pitems_data++;
  88     }
  89     pitem->length = pitem->code = 0;
  90
  91     /* Fill data_buffer with various info bits from this process */
  92     if (sys$getjpiw(EFN$C_ENF, NULL, NULL, item, &iosb, 0, 0) != SS$_NORMAL)
  93         return 0;
  94
  95     /* Now twist that data to seed the SSL random number init */
  96     for (i = 0; i < total_length; i++) {
  97         sys$gettim((struct _generic_64 *)&sys_time[0]);
  98         srand(sys_time[0] * data_buffer[0] * data_buffer[1] + i);
  99
 100         if (i == (total_length - 1)) { /* for JPI$_FINALEXC */
 101             ptr = &data_buffer[i];
 102             for (j = 0; j < 4; j++) {
 103                 data_buffer[i + j] = ptr[j];
 104                 /* OK to use rand() just to scramble the seed */
 105                 data_buffer[i + j] ^= (sys_time[0] ^ rand());
 106                 tmp_length++;
 107             }
 108         } else {
 109             /* OK to use rand() just to scramble the seed */
 110             data_buffer[i] ^= (sys_time[0] ^ rand());
 111         }
 112     }
 113
 114     total_length += (tmp_length - 1);
 115
 116     /*
 117      * Size of seed is total_length*4 bytes (64bytes). The original assumption
 118      * was that it contains 4 bits of entropy per byte. This makes a total
 119      * amount of total_length*16 bits (256bits).
 120      */
 121     return rand_pool_add(pool,
 122                          (PTR_T)data_buffer, total_length * 4,
 123                          total_length * 16);
 124 }
 125
 126 #endif