crypto/rand/rand_lib.c

   1 /* crypto/rand/rand_lib.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58
  59 #include <stdio.h>
  60 #include <time.h>
  61 #include "cryptlib.h"
  62 #include <openssl/rand.h>
  63 #include <openssl/engine.h>
  64
  65 static ENGINE *rand_engine=NULL;
  66
  67 #if 0
  68 void RAND_set_rand_method(RAND_METHOD *meth)
  69         {
  70         rand_meth=meth;
  71         }
  72 #else
  73 int RAND_set_rand_method(ENGINE *engine)
  74         {
  75         ENGINE *mtmp;
  76         mtmp = rand_engine;
  77         if (engine && !ENGINE_init(engine))
  78                 return 0;
  79         rand_engine = engine;
  80         /* SHOULD ERROR CHECK THIS!!! */
  81         if(mtmp)
  82                 ENGINE_finish(mtmp);
  83         return 1;
  84         }
  85 #endif
  86
  87 const RAND_METHOD *RAND_get_rand_method(void)
  88         {
  89         if (rand_engine == NULL
  90                 && (rand_engine = ENGINE_get_default_RAND()) == NULL)
  91                 {
  92                 RANDerr(RAND_F_RAND_GET_RAND_METHOD,ERR_LIB_ENGINE);
  93                 return NULL;
  94                 }
  95         return ENGINE_get_RAND(rand_engine);
  96         }
  97
  98 void RAND_cleanup(void)
  99         {
 100         const RAND_METHOD *meth = RAND_get_rand_method();
 101         if (meth && meth->cleanup)
 102                 meth->cleanup();
 103         }
 104
 105 void RAND_seed(const void *buf, int num)
 106         {
 107         const RAND_METHOD *meth = RAND_get_rand_method();
 108         if (meth && meth->seed)
 109                 meth->seed(buf,num);
 110         }
 111
 112 void RAND_add(const void *buf, int num, double entropy)
 113         {
 114         const RAND_METHOD *meth = RAND_get_rand_method();
 115         if (meth && meth->add)
 116                 meth->add(buf,num,entropy);
 117         }
 118
 119 int RAND_bytes(unsigned char *buf, int num)
 120         {
 121         const RAND_METHOD *meth = RAND_get_rand_method();
 122         if (meth && meth->bytes)
 123                 return meth->bytes(buf,num);
 124         return(-1);
 125         }
 126
 127 int RAND_pseudo_bytes(unsigned char *buf, int num)
 128         {
 129         const RAND_METHOD *meth = RAND_get_rand_method();
 130         if (meth && meth->pseudorand)
 131                 return meth->pseudorand(buf,num);
 132         return(-1);
 133         }
 134
 135 int RAND_status(void)
 136         {
 137         const RAND_METHOD *meth = RAND_get_rand_method();
 138         if (meth && meth->status)
 139                 return meth->status();
 140         return 0;
 141         }