crypto/thr_id.c

   1 /* crypto/cryptlib.c */
   2 /* ====================================================================
   3  * Copyright (c) 1998-2006 The OpenSSL Project.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  *
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  *
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in
  14  *    the documentation and/or other materials provided with the
  15  *    distribution.
  16  *
  17  * 3. All advertising materials mentioning features or use of this
  18  *    software must display the following acknowledgment:
  19  *    "This product includes software developed by the OpenSSL Project
  20  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  21  *
  22  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  23  *    endorse or promote products derived from this software without
  24  *    prior written permission. For written permission, please contact
  25  *    openssl-core@openssl.org.
  26  *
  27  * 5. Products derived from this software may not be called "OpenSSL"
  28  *    nor may "OpenSSL" appear in their names without prior written
  29  *    permission of the OpenSSL Project.
  30  *
  31  * 6. Redistributions of any form whatsoever must retain the following
  32  *    acknowledgment:
  33  *    "This product includes software developed by the OpenSSL Project
  34  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  35  *
  36  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  37  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  38  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  39  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  40  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  41  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  42  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  43  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  44  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  45  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  46  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  47  * OF THE POSSIBILITY OF SUCH DAMAGE.
  48  * ====================================================================
  49  *
  50  * This product includes cryptographic software written by Eric Young
  51  * (eay@cryptsoft.com).  This product includes software written by Tim
  52  * Hudson (tjh@cryptsoft.com).
  53  *
  54  */
  55 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  56  * All rights reserved.
  57  *
  58  * This package is an SSL implementation written
  59  * by Eric Young (eay@cryptsoft.com).
  60  * The implementation was written so as to conform with Netscapes SSL.
  61  *
  62  * This library is free for commercial and non-commercial use as long as
  63  * the following conditions are aheared to.  The following conditions
  64  * apply to all code found in this distribution, be it the RC4, RSA,
  65  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  66  * included with this distribution is covered by the same copyright terms
  67  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  68  *
  69  * Copyright remains Eric Young's, and as such any Copyright notices in
  70  * the code are not to be removed.
  71  * If this package is used in a product, Eric Young should be given attribution
  72  * as the author of the parts of the library used.
  73  * This can be in the form of a textual message at program startup or
  74  * in documentation (online or textual) provided with the package.
  75  *
  76  * Redistribution and use in source and binary forms, with or without
  77  * modification, are permitted provided that the following conditions
  78  * are met:
  79  * 1. Redistributions of source code must retain the copyright
  80  *    notice, this list of conditions and the following disclaimer.
  81  * 2. Redistributions in binary form must reproduce the above copyright
  82  *    notice, this list of conditions and the following disclaimer in the
  83  *    documentation and/or other materials provided with the distribution.
  84  * 3. All advertising materials mentioning features or use of this software
  85  *    must display the following acknowledgement:
  86  *    "This product includes cryptographic software written by
  87  *     Eric Young (eay@cryptsoft.com)"
  88  *    The word 'cryptographic' can be left out if the rouines from the library
  89  *    being used are not cryptographic related :-).
  90  * 4. If you include any Windows specific code (or a derivative thereof) from
  91  *    the apps directory (application code) you must include an acknowledgement:
  92  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  93  *
  94  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  95  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  96  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  97  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  98  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  99  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 100  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 101  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 102  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 103  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 104  * SUCH DAMAGE.
 105  *
 106  * The licence and distribution terms for any publically available version or
 107  * derivative of this code cannot be changed.  i.e. this code cannot simply be
 108  * copied and put under another distribution licence
 109  * [including the GNU Public Licence.]
 110  */
 111 /* ====================================================================
 112  * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
 113  * ECDH support in OpenSSL originally developed by
 114  * SUN MICROSYSTEMS, INC., and contributed to the OpenSSL project.
 115  */
 116
 117 #include "cryptlib.h"
 118
 119 #ifndef OPENSSL_NO_DEPRECATED
 120 static unsigned long (MS_FAR *id_callback)(void)=0;
 121 #endif
 122 static void (MS_FAR *threadid_callback)(CRYPTO_THREADID *)=0;
 123
 124 /* the memset() here and in set_pointer() seem overkill, but for the sake of
 125  * CRYPTO_THREADID_cmp() this avoids any platform silliness that might cause two
 126  * "equal" THREADID structs to not be memcmp()-identical. */
 127 void CRYPTO_THREADID_set_numeric(CRYPTO_THREADID *id, unsigned long val)
 128         {
 129         memset(id, 0, sizeof(*id));
 130         id->val = val;
 131         }
 132
 133 __fips_constseg
 134 static const unsigned char hash_coeffs[] = { 3, 5, 7, 11, 13, 17, 19, 23 };
 135 void CRYPTO_THREADID_set_pointer(CRYPTO_THREADID *id, void *ptr)
 136         {
 137         unsigned char *dest = (void *)&id->val;
 138         unsigned int accum = 0;
 139         unsigned char dnum = sizeof(id->val);
 140
 141         memset(id, 0, sizeof(*id));
 142         id->ptr = ptr;
 143         if (sizeof(id->val) >= sizeof(id->ptr))
 144                 {
 145                 /* 'ptr' can be embedded in 'val' without loss of uniqueness */
 146                 id->val = (unsigned long)id->ptr;
 147                 return;
 148                 }
 149         /* hash ptr ==> val. Each byte of 'val' gets the mod-256 total of a
 150          * linear function over the bytes in 'ptr', the co-efficients of which
 151          * are a sequence of low-primes (hash_coeffs is an 8-element cycle) -
 152          * the starting prime for the sequence varies for each byte of 'val'
 153          * (unique polynomials unless pointers are >64-bit). For added spice,
 154          * the totals accumulate rather than restarting from zero, and the index
 155          * of the 'val' byte is added each time (position dependence). If I was
 156          * a black-belt, I'd scan big-endian pointers in reverse to give
 157          * low-order bits more play, but this isn't crypto and I'd prefer nobody
 158          * mistake it as such. Plus I'm lazy. */
 159         while (dnum--)
 160                 {
 161                 const unsigned char *src = (void *)&id->ptr;
 162                 unsigned char snum = sizeof(id->ptr);
 163                 while (snum--)
 164                         accum += *(src++) * hash_coeffs[(snum + dnum) & 7];
 165                 accum += dnum;
 166                 *(dest++) = accum & 255;
 167                 }
 168         }
 169
 170 int CRYPTO_THREADID_set_callback(void (*func)(CRYPTO_THREADID *))
 171         {
 172         if (threadid_callback)
 173                 return 0;
 174         threadid_callback = func;
 175         return 1;
 176         }
 177
 178 void (*CRYPTO_THREADID_get_callback(void))(CRYPTO_THREADID *)
 179         {
 180         return threadid_callback;
 181         }
 182
 183 void CRYPTO_THREADID_current(CRYPTO_THREADID *id)
 184         {
 185         if (threadid_callback)
 186                 {
 187                 threadid_callback(id);
 188                 return;
 189                 }
 190 #ifndef OPENSSL_NO_DEPRECATED
 191         /* If the deprecated callback was set, fall back to that */
 192         if (id_callback)
 193                 {
 194                 CRYPTO_THREADID_set_numeric(id, id_callback());
 195                 return;
 196                 }
 197 #endif
 198         /* Else pick a backup */
 199 #ifdef OPENSSL_SYS_WIN16
 200         CRYPTO_THREADID_set_numeric(id, (unsigned long)GetCurrentTask());
 201 #elif defined(OPENSSL_SYS_WIN32)
 202         CRYPTO_THREADID_set_numeric(id, (unsigned long)GetCurrentThreadId());
 203 #elif defined(OPENSSL_SYS_BEOS)
 204         CRYPTO_THREADID_set_numeric(id, (unsigned long)find_thread(NULL));
 205 #else
 206         /* For everything else, default to using the address of 'errno' */
 207         CRYPTO_THREADID_set_pointer(id, &errno);
 208 #endif
 209         }
 210
 211 int CRYPTO_THREADID_cmp(const CRYPTO_THREADID *a, const CRYPTO_THREADID *b)
 212         {
 213         return memcmp(a, b, sizeof(*a));
 214         }
 215
 216 void CRYPTO_THREADID_cpy(CRYPTO_THREADID *dest, const CRYPTO_THREADID *src)
 217         {
 218         memcpy(dest, src, sizeof(*src));
 219         }
 220
 221 unsigned long CRYPTO_THREADID_hash(const CRYPTO_THREADID *id)
 222         {
 223         return id->val;
 224         }
 225
 226 #ifndef OPENSSL_NO_DEPRECATED
 227 unsigned long (*CRYPTO_get_id_callback(void))(void)
 228         {
 229         return(id_callback);
 230         }
 231
 232 void CRYPTO_set_id_callback(unsigned long (*func)(void))
 233         {
 234         id_callback=func;
 235         }
 236
 237 unsigned long CRYPTO_thread_id(void)
 238         {
 239         unsigned long ret=0;
 240
 241         if (id_callback == NULL)
 242                 {
 243 #ifdef OPENSSL_SYS_WIN16
 244                 ret=(unsigned long)GetCurrentTask();
 245 #elif defined(OPENSSL_SYS_WIN32)
 246                 ret=(unsigned long)GetCurrentThreadId();
 247 #elif defined(GETPID_IS_MEANINGLESS)
 248                 ret=1L;
 249 #elif defined(OPENSSL_SYS_BEOS)
 250                 ret=(unsigned long)find_thread(NULL);
 251 #else
 252                 ret=(unsigned long)getpid();
 253 #endif
 254                 }
 255         else
 256                 ret=id_callback();
 257         return(ret);
 258         }
 259 #endif