crypto/dh/dh_pmeth.c

   1 /* Written by Dr Stephen N Henson (steve@openssl.org) 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/asn1t.h>
  61 #include <openssl/x509.h>
  62 #include <openssl/evp.h>
  63 #include <openssl/dh.h>
  64 #include <openssl/bn.h>
  65 #include "evp_locl.h"
  66
  67 /* DH pkey context structure */
  68
  69 typedef struct
  70         {
  71         /* Parameter gen parameters */
  72         int prime_len;
  73         int generator;
  74         int use_dsa;
  75         int rfc5114_param;
  76         /* Keygen callback info */
  77         int gentmp[2];
  78         /* message digest */
  79         } DH_PKEY_CTX;
  80
  81 static int pkey_dh_init(EVP_PKEY_CTX *ctx)
  82         {
  83         DH_PKEY_CTX *dctx;
  84         dctx = OPENSSL_malloc(sizeof(DH_PKEY_CTX));
  85         if (!dctx)
  86                 return 0;
  87         dctx->prime_len = 1024;
  88         dctx->generator = 2;
  89         dctx->use_dsa = 0;
  90         dctx->rfc5114_param = 0;
  91
  92         ctx->data = dctx;
  93         ctx->keygen_info = dctx->gentmp;
  94         ctx->keygen_info_count = 2;
  95
  96         return 1;
  97         }
  98
  99 static int pkey_dh_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src)
 100         {
 101         DH_PKEY_CTX *dctx, *sctx;
 102         if (!pkey_dh_init(dst))
 103                 return 0;
 104         sctx = src->data;
 105         dctx = dst->data;
 106         dctx->prime_len = sctx->prime_len;
 107         dctx->generator = sctx->generator;
 108         dctx->use_dsa = sctx->use_dsa;
 109         dctx->rfc5114_param = sctx->rfc5114_param;
 110         return 1;
 111         }
 112
 113 static void pkey_dh_cleanup(EVP_PKEY_CTX *ctx)
 114         {
 115         DH_PKEY_CTX *dctx = ctx->data;
 116         if (dctx)
 117                 OPENSSL_free(dctx);
 118         }
 119
 120 static int pkey_dh_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
 121         {
 122         DH_PKEY_CTX *dctx = ctx->data;
 123         switch (type)
 124                 {
 125                 case EVP_PKEY_CTRL_DH_PARAMGEN_PRIME_LEN:
 126                 if (p1 < 256)
 127                         return -2;
 128                 dctx->prime_len = p1;
 129                 return 1;
 130
 131                 case EVP_PKEY_CTRL_DH_PARAMGEN_GENERATOR:
 132                 dctx->generator = p1;
 133                 return 1;
 134
 135                 case EVP_PKEY_CTRL_DH_RFC5114:
 136                 if (p1 < 1 || p1 > 3)
 137                         return -2;
 138                 dctx->rfc5114_param = p1;
 139                 return 1;
 140
 141                 case EVP_PKEY_CTRL_PEER_KEY:
 142                 /* Default behaviour is OK */
 143                 return 1;
 144
 145                 default:
 146                 return -2;
 147
 148                 }
 149         }
 150
 151
 152 static int pkey_dh_ctrl_str(EVP_PKEY_CTX *ctx,
 153                         const char *type, const char *value)
 154         {
 155         if (!strcmp(type, "dh_paramgen_prime_len"))
 156                 {
 157                 int len;
 158                 len = atoi(value);
 159                 return EVP_PKEY_CTX_set_dh_paramgen_prime_len(ctx, len);
 160                 }
 161         if (!strcmp(type, "dh_rfc5114"))
 162                 {
 163                 DH_PKEY_CTX *dctx = ctx->data;
 164                 int len;
 165                 len = atoi(value);
 166                 if (len < 0 || len > 3)
 167                         return -2;
 168                 dctx->rfc5114_param = len;
 169                 return 1;
 170                 }
 171         if (!strcmp(type, "dh_paramgen_generator"))
 172                 {
 173                 int len;
 174                 len = atoi(value);
 175                 return EVP_PKEY_CTX_set_dh_paramgen_generator(ctx, len);
 176                 }
 177         return -2;
 178         }
 179
 180 static int pkey_dh_paramgen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
 181         {
 182         DH *dh = NULL;
 183         DH_PKEY_CTX *dctx = ctx->data;
 184         BN_GENCB *pcb, cb;
 185         int ret;
 186         if (dctx->rfc5114_param)
 187                 {
 188                 switch (dctx->rfc5114_param)
 189                         {
 190                         case 1:
 191                         dh = DH_get_1024_160();
 192                         break;
 193
 194                         case 2:
 195                         dh = DH_get_2048_224();
 196                         break;
 197
 198                         case 3:
 199                         dh = DH_get_2048_256();
 200                         break;
 201
 202                         default:
 203                         return -2;
 204                         }
 205                 EVP_PKEY_assign(pkey, EVP_PKEY_DHX, dh);
 206                 return 1;
 207                 }
 208
 209         if (ctx->pkey_gencb)
 210                 {
 211                 pcb = &cb;
 212                 evp_pkey_set_cb_translate(pcb, ctx);
 213                 }
 214         else
 215                 pcb = NULL;
 216         dh = DH_new();
 217         if (!dh)
 218                 return 0;
 219         ret = DH_generate_parameters_ex(dh,
 220                                         dctx->prime_len, dctx->generator, pcb);
 221         if (ret)
 222                 EVP_PKEY_assign_DH(pkey, dh);
 223         else
 224                 DH_free(dh);
 225         return ret;
 226         }
 227
 228 static int pkey_dh_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
 229         {
 230         DH *dh = NULL;
 231         if (ctx->pkey == NULL)
 232                 {
 233                 DHerr(DH_F_PKEY_DH_KEYGEN, DH_R_NO_PARAMETERS_SET);
 234                 return 0;
 235                 }
 236         dh = DH_new();
 237         if (!dh)
 238                 return 0;
 239         EVP_PKEY_assign(pkey, ctx->pmeth->pkey_id, dh);
 240         /* Note: if error return, pkey is freed by parent routine */
 241         if (!EVP_PKEY_copy_parameters(pkey, ctx->pkey))
 242                 return 0;
 243         return DH_generate_key(pkey->pkey.dh);
 244         }
 245
 246 static int pkey_dh_derive(EVP_PKEY_CTX *ctx, unsigned char *key, size_t *keylen)
 247         {
 248         int ret;
 249         if (!ctx->pkey || !ctx->peerkey)
 250                 {
 251                 DHerr(DH_F_PKEY_DH_DERIVE, DH_R_KEYS_NOT_SET);
 252                 return 0;
 253                 }
 254         ret = DH_compute_key(key, ctx->peerkey->pkey.dh->pub_key,
 255                                                         ctx->pkey->pkey.dh);
 256         if (ret < 0)
 257                 return ret;
 258         *keylen = ret;
 259         return 1;
 260         }
 261
 262 const EVP_PKEY_METHOD dh_pkey_meth =
 263         {
 264         EVP_PKEY_DH,
 265         EVP_PKEY_FLAG_AUTOARGLEN,
 266         pkey_dh_init,
 267         pkey_dh_copy,
 268         pkey_dh_cleanup,
 269
 270         0,
 271         pkey_dh_paramgen,
 272
 273         0,
 274         pkey_dh_keygen,
 275
 276         0,
 277         0,
 278
 279         0,
 280         0,
 281
 282         0,0,
 283
 284         0,0,0,0,
 285
 286         0,0,
 287
 288         0,0,
 289
 290         0,
 291         pkey_dh_derive,
 292
 293         pkey_dh_ctrl,
 294         pkey_dh_ctrl_str
 295
 296         };
 297
 298 const EVP_PKEY_METHOD dhx_pkey_meth =
 299         {
 300         EVP_PKEY_DHX,
 301         EVP_PKEY_FLAG_AUTOARGLEN,
 302         pkey_dh_init,
 303         pkey_dh_copy,
 304         pkey_dh_cleanup,
 305
 306         0,
 307         pkey_dh_paramgen,
 308
 309         0,
 310         pkey_dh_keygen,
 311
 312         0,
 313         0,
 314
 315         0,
 316         0,
 317
 318         0,0,
 319
 320         0,0,0,0,
 321
 322         0,0,
 323
 324         0,0,
 325
 326         0,
 327         pkey_dh_derive,
 328
 329         pkey_dh_ctrl,
 330         pkey_dh_ctrl_str
 331
 332         };