crypto/dh/dh_ameth.c

   1 /* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
   2  * project 2006.
   3  */
   4 /* ====================================================================
   5  * Copyright (c) 2006 The OpenSSL Project.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  *
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in
  16  *    the documentation and/or other materials provided with the
  17  *    distribution.
  18  *
  19  * 3. All advertising materials mentioning features or use of this
  20  *    software must display the following acknowledgment:
  21  *    "This product includes software developed by the OpenSSL Project
  22  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  23  *
  24  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  25  *    endorse or promote products derived from this software without
  26  *    prior written permission. For written permission, please contact
  27  *    licensing@OpenSSL.org.
  28  *
  29  * 5. Products derived from this software may not be called "OpenSSL"
  30  *    nor may "OpenSSL" appear in their names without prior written
  31  *    permission of the OpenSSL Project.
  32  *
  33  * 6. Redistributions of any form whatsoever must retain the following
  34  *    acknowledgment:
  35  *    "This product includes software developed by the OpenSSL Project
  36  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  37  *
  38  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  39  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  40  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  41  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  42  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  43  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  44  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  45  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  46  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  47  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  48  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  49  * OF THE POSSIBILITY OF SUCH DAMAGE.
  50  * ====================================================================
  51  *
  52  * This product includes cryptographic software written by Eric Young
  53  * (eay@cryptsoft.com).  This product includes software written by Tim
  54  * Hudson (tjh@cryptsoft.com).
  55  *
  56  */
  57
  58 #include <stdio.h>
  59 #include "cryptlib.h"
  60 #include <openssl/x509.h>
  61 #include <openssl/asn1.h>
  62 #include <openssl/dh.h>
  63 #include "asn1_locl.h"
  64
  65 static void int_dh_free(EVP_PKEY *pkey)
  66         {
  67         DH_free(pkey->pkey.dh);
  68         }
  69
  70 static int dh_param_decode(EVP_PKEY *pkey,
  71                                         const unsigned char **pder, int derlen)
  72         {
  73         DH *dh;
  74         if (!(dh = d2i_DHparams(NULL, pder, derlen)))
  75                 {
  76                 DHerr(DH_F_DH_PARAM_DECODE, ERR_R_DH_LIB);
  77                 return 0;
  78                 }
  79         EVP_PKEY_assign_DH(pkey, dh);
  80         return 1;
  81         }
  82
  83 static int dh_param_encode(const EVP_PKEY *pkey, unsigned char **pder)
  84         {
  85         return i2d_DHparams(pkey->pkey.dh, pder);
  86         }
  87
  88 static int do_dhparam_print(BIO *bp, const DH *x, int indent,
  89                                                         ASN1_PCTX *ctx)
  90         {
  91         unsigned char *m=NULL;
  92         int reason=ERR_R_BUF_LIB,ret=0;
  93         size_t buf_len=0, i;
  94
  95         if (x->p)
  96                 buf_len = (size_t)BN_num_bytes(x->p);
  97         else
  98                 {
  99                 reason = ERR_R_PASSED_NULL_PARAMETER;
 100                 goto err;
 101                 }
 102         if (x->g)
 103                 if (buf_len < (i = (size_t)BN_num_bytes(x->g)))
 104                         buf_len = i;
 105         m=(unsigned char *)OPENSSL_malloc(buf_len+10);
 106         if (m == NULL)
 107                 {
 108                 reason=ERR_R_MALLOC_FAILURE;
 109                 goto err;
 110                 }
 111
 112         BIO_indent(bp, indent, 128);
 113         if (BIO_printf(bp,"Diffie-Hellman-Parameters: (%d bit)\n",
 114                 BN_num_bits(x->p)) <= 0)
 115                 goto err;
 116         indent += 4;
 117         if (!ASN1_bn_print(bp,"prime:",x->p,m,indent)) goto err;
 118         if (!ASN1_bn_print(bp,"generator:",x->g,m,indent)) goto err;
 119         if (x->length != 0)
 120                 {
 121                 BIO_indent(bp, indent, 128);
 122                 if (BIO_printf(bp,"recommended-private-length: %d bits\n",
 123                         (int)x->length) <= 0) goto err;
 124                 }
 125         ret=1;
 126         if (0)
 127                 {
 128 err:
 129                 DHerr(DH_F_DHPARAMS_PRINT,reason);
 130                 }
 131         if (m != NULL) OPENSSL_free(m);
 132         return(ret);
 133         }
 134
 135 static int dh_param_print(BIO *bp, const EVP_PKEY *pkey, int indent,
 136                                                         ASN1_PCTX *ctx)
 137         {
 138         return do_dhparam_print(bp, pkey->pkey.dh, indent, ctx);
 139         }
 140
 141 int DHparams_print(BIO *bp, const DH *x)
 142         {
 143         return do_dhparam_print(bp, x, 4, NULL);
 144         }
 145
 146 const EVP_PKEY_ASN1_METHOD dh_asn1_meth =
 147         {
 148         EVP_PKEY_DH,
 149         EVP_PKEY_DH,
 150         0,
 151
 152         "dh",
 153         "OpenSSL PKCS#3 DH method",
 154
 155         0,
 156         0,
 157         0,
 158         0,
 159
 160         0,
 161         0,
 162         0,
 163
 164         0,
 165         0,
 166
 167         dh_param_decode,
 168         dh_param_encode,
 169         0,0,0,
 170         dh_param_print,
 171
 172         int_dh_free,
 173         0
 174         };
 175