crypto/openssl-0.9.7e/crypto/dh/dh_lib.c

   1 /* crypto/dh/dh_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 "cryptlib.h"
  61 #include <openssl/bn.h>
  62 #include <openssl/dh.h>
  63 #ifndef OPENSSL_NO_ENGINE
  64 #include <openssl/engine.h>
  65 #endif
  66
  67 const char *DH_version="Diffie-Hellman" OPENSSL_VERSION_PTEXT;
  68
  69 static const DH_METHOD *default_DH_method = NULL;
  70
  71 void DH_set_default_method(const DH_METHOD *meth)
  72         {
  73         default_DH_method = meth;
  74         }
  75
  76 const DH_METHOD *DH_get_default_method(void)
  77         {
  78         if(!default_DH_method)
  79                 default_DH_method = DH_OpenSSL();
  80         return default_DH_method;
  81         }
  82
  83 int DH_set_method(DH *dh, const DH_METHOD *meth)
  84         {
  85         /* NB: The caller is specifically setting a method, so it's not up to us
  86          * to deal with which ENGINE it comes from. */
  87         const DH_METHOD *mtmp;
  88         mtmp = dh->meth;
  89         if (mtmp->finish) mtmp->finish(dh);
  90 #ifndef OPENSSL_NO_ENGINE
  91         if (dh->engine)
  92                 {
  93                 ENGINE_finish(dh->engine);
  94                 dh->engine = NULL;
  95                 }
  96 #endif
  97         dh->meth = meth;
  98         if (meth->init) meth->init(dh);
  99         return 1;
 100         }
 101
 102 DH *DH_new(void)
 103         {
 104         return DH_new_method(NULL);
 105         }
 106
 107 DH *DH_new_method(ENGINE *engine)
 108         {
 109         DH *ret;
 110
 111         ret=(DH *)OPENSSL_malloc(sizeof(DH));
 112         if (ret == NULL)
 113                 {
 114                 DHerr(DH_F_DH_NEW_METHOD,ERR_R_MALLOC_FAILURE);
 115                 return(NULL);
 116                 }
 117
 118         ret->meth = DH_get_default_method();
 119 #ifndef OPENSSL_NO_ENGINE
 120         if (engine)
 121                 {
 122                 if (!ENGINE_init(engine))
 123                         {
 124                         DHerr(DH_F_DH_NEW_METHOD, ERR_R_ENGINE_LIB);
 125                         OPENSSL_free(ret);
 126                         return NULL;
 127                         }
 128                 ret->engine = engine;
 129                 }
 130         else
 131                 ret->engine = ENGINE_get_default_DH();
 132         if(ret->engine)
 133                 {
 134                 ret->meth = ENGINE_get_DH(ret->engine);
 135                 if(!ret->meth)
 136                         {
 137                         DHerr(DH_F_DH_NEW_METHOD,ERR_R_ENGINE_LIB);
 138                         ENGINE_finish(ret->engine);
 139                         OPENSSL_free(ret);
 140                         return NULL;
 141                         }
 142                 }
 143 #endif
 144
 145         ret->pad=0;
 146         ret->version=0;
 147         ret->p=NULL;
 148         ret->g=NULL;
 149         ret->length=0;
 150         ret->pub_key=NULL;
 151         ret->priv_key=NULL;
 152         ret->q=NULL;
 153         ret->j=NULL;
 154         ret->seed = NULL;
 155         ret->seedlen = 0;
 156         ret->counter = NULL;
 157         ret->method_mont_p=NULL;
 158         ret->references = 1;
 159         ret->flags=ret->meth->flags;
 160         CRYPTO_new_ex_data(CRYPTO_EX_INDEX_DH, ret, &ret->ex_data);
 161         if ((ret->meth->init != NULL) && !ret->meth->init(ret))
 162                 {
 163 #ifndef OPENSSL_NO_ENGINE
 164                 if (ret->engine)
 165                         ENGINE_finish(ret->engine);
 166 #endif
 167                 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DH, ret, &ret->ex_data);
 168                 OPENSSL_free(ret);
 169                 ret=NULL;
 170                 }
 171         return(ret);
 172         }
 173
 174 void DH_free(DH *r)
 175         {
 176         int i;
 177         if(r == NULL) return;
 178         i = CRYPTO_add(&r->references, -1, CRYPTO_LOCK_DH);
 179 #ifdef REF_PRINT
 180         REF_PRINT("DH",r);
 181 #endif
 182         if (i > 0) return;
 183 #ifdef REF_CHECK
 184         if (i < 0)
 185                 {
 186                 fprintf(stderr,"DH_free, bad reference count\n");
 187                 abort();
 188         }
 189 #endif
 190
 191         if (r->meth->finish)
 192                 r->meth->finish(r);
 193 #ifndef OPENSSL_NO_ENGINE
 194         if (r->engine)
 195                 ENGINE_finish(r->engine);
 196 #endif
 197
 198         CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DH, r, &r->ex_data);
 199
 200         if (r->p != NULL) BN_clear_free(r->p);
 201         if (r->g != NULL) BN_clear_free(r->g);
 202         if (r->q != NULL) BN_clear_free(r->q);
 203         if (r->j != NULL) BN_clear_free(r->j);
 204         if (r->seed) OPENSSL_free(r->seed);
 205         if (r->counter != NULL) BN_clear_free(r->counter);
 206         if (r->pub_key != NULL) BN_clear_free(r->pub_key);
 207         if (r->priv_key != NULL) BN_clear_free(r->priv_key);
 208         OPENSSL_free(r);
 209         }
 210
 211 int DH_up_ref(DH *r)
 212         {
 213         int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_DH);
 214 #ifdef REF_PRINT
 215         REF_PRINT("DH",r);
 216 #endif
 217 #ifdef REF_CHECK
 218         if (i < 2)
 219                 {
 220                 fprintf(stderr, "DH_up, bad reference count\n");
 221                 abort();
 222                 }
 223 #endif
 224         return ((i > 1) ? 1 : 0);
 225         }
 226
 227 int DH_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
 228              CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)
 229         {
 230         return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_DH, argl, argp,
 231                                 new_func, dup_func, free_func);
 232         }
 233
 234 int DH_set_ex_data(DH *d, int idx, void *arg)
 235         {
 236         return(CRYPTO_set_ex_data(&d->ex_data,idx,arg));
 237         }
 238
 239 void *DH_get_ex_data(DH *d, int idx)
 240         {
 241         return(CRYPTO_get_ex_data(&d->ex_data,idx));
 242         }
 243
 244 int DH_size(const DH *dh)
 245         {
 246         return(BN_num_bytes(dh->p));
 247         }