OSX/libsecurity_apple_csp/open_ssl/dh/dh_lib.c

   1 /*
   2  * Copyright (c) 2000-2002,2011,2014 Apple Inc. All Rights Reserved.
   3  *
   4  * The contents of this file constitute Original Code as defined in and are
   5  * subject to the Apple Public Source License Version 1.2 (the 'License').
   6  * You may not use this file except in compliance with the License. Please obtain
   7  * a copy of the License at http://www.apple.com/publicsource and read it before
   8  * using this file.
   9  *
  10  * This Original Code and all software distributed under the License are
  11  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS
  12  * OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, INCLUDING WITHOUT
  13  * LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
  14  * PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. Please see the License for the
  15  * specific language governing rights and limitations under the License.
  16  */
  17
  18 /* crypto/dh/dh_lib.c */
  19 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  20  * All rights reserved.
  21  *
  22  * This package is an SSL implementation written
  23  * by Eric Young (eay@cryptsoft.com).
  24  * The implementation was written so as to conform with Netscapes SSL.
  25  *
  26  * This library is free for commercial and non-commercial use as long as
  27  * the following conditions are aheared to.  The following conditions
  28  * apply to all code found in this distribution, be it the RC4, RSA,
  29  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  30  * included with this distribution is covered by the same copyright terms
  31  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  32  *
  33  * Copyright remains Eric Young's, and as such any Copyright notices in
  34  * the code are not to be removed.
  35  * If this package is used in a product, Eric Young should be given attribution
  36  * as the author of the parts of the library used.
  37  * This can be in the form of a textual message at program startup or
  38  * in documentation (online or textual) provided with the package.
  39  *
  40  * Redistribution and use in source and binary forms, with or without
  41  * modification, are permitted provided that the following conditions
  42  * are met:
  43  * 1. Redistributions of source code must retain the copyright
  44  *    notice, this list of conditions and the following disclaimer.
  45  * 2. Redistributions in binary form must reproduce the above copyright
  46  *    notice, this list of conditions and the following disclaimer in the
  47  *    documentation and/or other materials provided with the distribution.
  48  * 3. All advertising materials mentioning features or use of this software
  49  *    must display the following acknowledgement:
  50  *    "This product includes cryptographic software written by
  51  *     Eric Young (eay@cryptsoft.com)"
  52  *    The word 'cryptographic' can be left out if the rouines from the library
  53  *    being used are not cryptographic related :-).
  54  * 4. If you include any Windows specific code (or a derivative thereof) from
  55  *    the apps directory (application code) you must include an acknowledgement:
  56  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  57  *
  58  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  59  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  60  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  61  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  62  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  63  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  64  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  65  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  66  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  67  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  68  * SUCH DAMAGE.
  69  *
  70  * The licence and distribution terms for any publically available version or
  71  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  72  * copied and put under another distribution licence
  73  * [including the GNU Public Licence.]
  74  */
  75
  76 #include <stdio.h>
  77 #include "cryptlib.h"
  78 #include <openssl/bn_legacy.h>
  79 #include <openssl/dh_legacy.h>
  80
  81 const char *DH_version="Diffie-Hellman" OPENSSL_VERSION_PTEXT;
  82
  83 static DH_METHOD *default_DH_method;
  84 static int dh_meth_num = 0;
  85 static STACK_OF(CRYPTO_EX_DATA_FUNCS) *dh_meth = NULL;
  86
  87 void DH_set_default_method(DH_METHOD *meth)
  88 {
  89         default_DH_method = meth;
  90 }
  91
  92 DH_METHOD *DH_get_default_method(void)
  93 {
  94         if(!default_DH_method) default_DH_method = DH_OpenSSL();
  95         return default_DH_method;
  96 }
  97
  98 DH_METHOD *DH_set_method(DH *dh, DH_METHOD *meth)
  99 {
 100         DH_METHOD *mtmp;
 101         mtmp = dh->meth;
 102         if (mtmp->finish) mtmp->finish(dh);
 103         dh->meth = meth;
 104         if (meth->init) meth->init(dh);
 105         return mtmp;
 106 }
 107
 108 DH *DH_new(void)
 109 {
 110         return DH_new_method(NULL);
 111 }
 112
 113 DH *DH_new_method(DH_METHOD *meth)
 114         {
 115         DH *ret;
 116         ret=(DH *)Malloc(sizeof(DH));
 117
 118         if (ret == NULL)
 119                 {
 120                 DHerr(DH_F_DH_NEW,ERR_R_MALLOC_FAILURE);
 121                 return(NULL);
 122                 }
 123         if(meth) ret->meth = meth;
 124         else ret->meth = DH_get_default_method();
 125         ret->pad=0;
 126         ret->version=0;
 127         ret->p=NULL;
 128         ret->g=NULL;
 129         ret->length=0;
 130         ret->pub_key=NULL;
 131         ret->priv_key=NULL;
 132         ret->q=NULL;
 133         ret->j=NULL;
 134         ret->seed = NULL;
 135         ret->seedlen = 0;
 136         ret->counter = NULL;
 137         ret->method_mont_p=NULL;
 138         ret->references = 1;
 139         ret->flags=ret->meth->flags;
 140         CRYPTO_new_ex_data(dh_meth,ret,&ret->ex_data);
 141         if ((ret->meth->init != NULL) && !ret->meth->init(ret))
 142                 {
 143                 CRYPTO_free_ex_data(dh_meth,ret,&ret->ex_data);
 144                 Free(ret);
 145                 ret=NULL;
 146                 }
 147         return(ret);
 148         }
 149
 150 void DH_free(DH *r)
 151         {
 152         int i;
 153         if(r == NULL) return;
 154         i = CRYPTO_add(&r->references, -1, CRYPTO_LOCK_DH);
 155 #ifdef REF_PRINT
 156         REF_PRINT("DH",r);
 157 #endif
 158         if (i > 0) return;
 159 #ifdef REF_CHECK
 160         if (i < 0)
 161                 {
 162                 fprintf(stderr,"DH_free, bad reference count\n");
 163                 abort();
 164         }
 165 #endif
 166
 167         if(r->meth->finish) r->meth->finish(r);
 168
 169         CRYPTO_free_ex_data(dh_meth, r, &r->ex_data);
 170
 171         if (r->p != NULL) BN_clear_free(r->p);
 172         if (r->g != NULL) BN_clear_free(r->g);
 173         if (r->q != NULL) BN_clear_free(r->q);
 174         if (r->j != NULL) BN_clear_free(r->j);
 175         if (r->seed) Free(r->seed);
 176         if (r->counter != NULL) BN_clear_free(r->counter);
 177         if (r->pub_key != NULL) BN_clear_free(r->pub_key);
 178         if (r->priv_key != NULL) BN_clear_free(r->priv_key);
 179         Free(r);
 180         }
 181
 182 int DH_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
 183              CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)
 184         {
 185         dh_meth_num++;
 186         return(CRYPTO_get_ex_new_index(dh_meth_num-1,
 187                 &dh_meth,argl,argp,new_func,dup_func,free_func));
 188         }
 189
 190 int DH_set_ex_data(DH *d, int idx, void *arg)
 191         {
 192         return(CRYPTO_set_ex_data(&d->ex_data,idx,arg));
 193         }
 194
 195 void *DH_get_ex_data(DH *d, int idx)
 196         {
 197         return(CRYPTO_get_ex_data(&d->ex_data,idx));
 198         }
 199
 200 int DH_size(DH *dh)
 201         {
 202         return(BN_num_bytes(dh->p));
 203         }