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 #include <openssl/engine.h>
  64
  65 const char *DH_version="Diffie-Hellman" OPENSSL_VERSION_PTEXT;
  66
  67 static const DH_METHOD *default_DH_method = NULL;
  68 static int dh_meth_num = 0;
  69 static STACK_OF(CRYPTO_EX_DATA_FUNCS) *dh_meth = NULL;
  70
  71 void DH_set_default_openssl_method(const DH_METHOD *meth)
  72 {
  73         ENGINE *e;
  74         /* We'll need to notify the "openssl" ENGINE of this
  75          * change too. We won't bother locking things down at
  76          * our end as there was never any locking in these
  77          * functions! */
  78         if(default_DH_method != meth)
  79                 {
  80                 default_DH_method = meth;
  81                 e = ENGINE_by_id("openssl");
  82                 if(e)
  83                         {
  84                         ENGINE_set_DH(e, meth);
  85                         ENGINE_free(e);
  86                         }
  87                 }
  88 }
  89
  90 const DH_METHOD *DH_get_default_openssl_method(void)
  91 {
  92         if(!default_DH_method) default_DH_method = DH_OpenSSL();
  93         return default_DH_method;
  94 }
  95
  96 #if 0
  97 DH_METHOD *DH_set_method(DH *dh, DH_METHOD *meth)
  98 {
  99         DH_METHOD *mtmp;
 100         mtmp = dh->meth;
 101         if (mtmp->finish) mtmp->finish(dh);
 102         dh->meth = meth;
 103         if (meth->init) meth->init(dh);
 104         return mtmp;
 105 }
 106 #else
 107 int DH_set_method(DH *dh, ENGINE *engine)
 108 {
 109         ENGINE *mtmp;
 110         const DH_METHOD *meth;
 111         mtmp = dh->engine;
 112         meth = ENGINE_get_DH(mtmp);
 113         if (!ENGINE_init(engine))
 114                 return 0;
 115         if (meth->finish) meth->finish(dh);
 116         dh->engine= engine;
 117         meth = ENGINE_get_DH(engine);
 118         if (meth->init) meth->init(dh);
 119         /* SHOULD ERROR CHECK THIS!!! */
 120         ENGINE_finish(mtmp);
 121         return 1;
 122 }
 123 #endif
 124
 125 DH *DH_new(void)
 126 {
 127         return DH_new_method(NULL);
 128 }
 129
 130 #if 0
 131 DH *DH_new_method(DH_METHOD *meth)
 132 #else
 133 DH *DH_new_method(ENGINE *engine)
 134 #endif
 135         {
 136         const DH_METHOD *meth;
 137         DH *ret;
 138         ret=(DH *)OPENSSL_malloc(sizeof(DH));
 139
 140         if (ret == NULL)
 141                 {
 142                 DHerr(DH_F_DH_NEW,ERR_R_MALLOC_FAILURE);
 143                 return(NULL);
 144                 }
 145
 146         if (engine)
 147                 {
 148                 if(ENGINE_init(engine))
 149                         ret->engine = engine;
 150                 else
 151                         ret->engine = NULL;
 152                 }
 153         else
 154                 ret->engine=ENGINE_get_default_DH();
 155         if(ret->engine == NULL)
 156                 {
 157                 DHerr(DH_F_DH_NEW,ERR_LIB_ENGINE);
 158                 OPENSSL_free(ret);
 159                 return NULL;
 160                 }
 161         meth = ENGINE_get_DH(ret->engine);
 162         ret->pad=0;
 163         ret->version=0;
 164         ret->p=NULL;
 165         ret->g=NULL;
 166         ret->length=0;
 167         ret->pub_key=NULL;
 168         ret->priv_key=NULL;
 169         ret->q=NULL;
 170         ret->j=NULL;
 171         ret->seed = NULL;
 172         ret->seedlen = 0;
 173         ret->counter = NULL;
 174         ret->method_mont_p=NULL;
 175         ret->references = 1;
 176         ret->flags=meth->flags;
 177         CRYPTO_new_ex_data(dh_meth,ret,&ret->ex_data);
 178         if ((meth->init != NULL) && !meth->init(ret))
 179                 {
 180                 CRYPTO_free_ex_data(dh_meth,ret,&ret->ex_data);
 181                 OPENSSL_free(ret);
 182                 ret=NULL;
 183                 }
 184         return(ret);
 185         }
 186
 187 void DH_free(DH *r)
 188         {
 189         const DH_METHOD *meth;
 190         int i;
 191         if(r == NULL) return;
 192         i = CRYPTO_add(&r->references, -1, CRYPTO_LOCK_DH);
 193 #ifdef REF_PRINT
 194         REF_PRINT("DH",r);
 195 #endif
 196         if (i > 0) return;
 197 #ifdef REF_CHECK
 198         if (i < 0)
 199                 {
 200                 fprintf(stderr,"DH_free, bad reference count\n");
 201                 abort();
 202         }
 203 #endif
 204
 205         meth = ENGINE_get_DH(r->engine);
 206         if(meth->finish) meth->finish(r);
 207         ENGINE_finish(r->engine);
 208
 209         CRYPTO_free_ex_data(dh_meth, r, &r->ex_data);
 210
 211         if (r->p != NULL) BN_clear_free(r->p);
 212         if (r->g != NULL) BN_clear_free(r->g);
 213         if (r->q != NULL) BN_clear_free(r->q);
 214         if (r->j != NULL) BN_clear_free(r->j);
 215         if (r->seed) OPENSSL_free(r->seed);
 216         if (r->counter != NULL) BN_clear_free(r->counter);
 217         if (r->pub_key != NULL) BN_clear_free(r->pub_key);
 218         if (r->priv_key != NULL) BN_clear_free(r->priv_key);
 219         OPENSSL_free(r);
 220         }
 221
 222 int DH_up(DH *r)
 223         {
 224         int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_DH);
 225 #ifdef REF_PRINT
 226         REF_PRINT("DH",r);
 227 #endif
 228 #ifdef REF_CHECK
 229         if (i < 2)
 230                 {
 231                 fprintf(stderr, "DH_up, bad reference count\n");
 232                 abort();
 233                 }
 234 #endif
 235         return ((i > 1) ? 1 : 0);
 236         }
 237
 238 int DH_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
 239              CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)
 240         {
 241         if(CRYPTO_get_ex_new_index(dh_meth_num, &dh_meth, argl, argp,
 242                                 new_func, dup_func, free_func) < 0)
 243                 return -1;
 244         return (dh_meth_num++);
 245         }
 246
 247 int DH_set_ex_data(DH *d, int idx, void *arg)
 248         {
 249         return(CRYPTO_set_ex_data(&d->ex_data,idx,arg));
 250         }
 251
 252 void *DH_get_ex_data(DH *d, int idx)
 253         {
 254         return(CRYPTO_get_ex_data(&d->ex_data,idx));
 255         }
 256
 257 int DH_size(const DH *dh)
 258         {
 259         return(BN_num_bytes(dh->p));
 260         }