crypto/asn1/d2i_dhp.c

   1 /* crypto/asn1/d2i_dhp.c */
   2 /* Copyright (C) 1995-1997 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 "bn.h"
  62 #include "dh.h"
  63 #include "objects.h"
  64 #include "asn1_mac.h"
  65
  66 /*
  67  * ASN1err(ASN1_F_D2I_DHPARAMS,ASN1_R_LENGTH_MISMATCH);
  68  * ASN1err(ASN1_F_I2D_DHPARAMS,ASN1_R_UNKNOWN_ATTRIBUTE_TYPE);
  69  */
  70
  71 DH *d2i_DHparams(a,pp,length)
  72 DH **a;
  73 unsigned char **pp;
  74 long length;
  75         {
  76         int i=ASN1_R_ERROR_STACK;
  77         ASN1_INTEGER *bs=NULL;
  78         long v=0;
  79         M_ASN1_D2I_vars(a,DH *,DH_new);
  80
  81         M_ASN1_D2I_Init();
  82         M_ASN1_D2I_start_sequence();
  83         M_ASN1_D2I_get(bs,d2i_ASN1_INTEGER);
  84         if ((ret->p=BN_bin2bn(bs->data,bs->length,ret->p)) == NULL) goto err_bn;
  85         M_ASN1_D2I_get(bs,d2i_ASN1_INTEGER);
  86         if ((ret->g=BN_bin2bn(bs->data,bs->length,ret->g)) == NULL) goto err_bn;
  87
  88         if (!M_ASN1_D2I_end_sequence())
  89                 {
  90                 M_ASN1_D2I_get(bs,d2i_ASN1_INTEGER);
  91                 for (i=0; i<bs->length; i++)
  92                         v=(v<<8)|(bs->data[i]);
  93                 ret->length=(int)v;
  94                 }
  95
  96         ASN1_BIT_STRING_free(bs);
  97
  98         M_ASN1_D2I_Finish_2(a);
  99
 100 err_bn:
 101         i=ERR_R_BN_LIB;
 102 err:
 103         ASN1err(ASN1_F_D2I_DHPARAMS,i);
 104         if ((ret != NULL) && ((a == NULL) || (*a != ret))) DH_free(ret);
 105         if (bs != NULL) ASN1_BIT_STRING_free(bs);
 106         return(NULL);
 107         }
 108