release/src/router/openssl/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         /* Keygen callback info */
  76         int gentmp[2];
  77         /* message digest */
  78         } DH_PKEY_CTX;
  79
  80 static int pkey_dh_init(EVP_PKEY_CTX *ctx)
  81         {
  82         DH_PKEY_CTX *dctx;
  83         dctx = OPENSSL_malloc(sizeof(DH_PKEY_CTX));
  84         if (!dctx)
  85                 return 0;
  86         dctx->prime_len = 1024;
  87         dctx->generator = 2;
  88         dctx->use_dsa = 0;
  89
  90         ctx->data = dctx;
  91         ctx->keygen_info = dctx->gentmp;
  92         ctx->keygen_info_count = 2;
  93
  94         return 1;
  95         }
  96
  97 static int pkey_dh_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src)
  98         {
  99         DH_PKEY_CTX *dctx, *sctx;
 100         if (!pkey_dh_init(dst))
 101                 return 0;
 102         sctx = src->data;
 103         dctx = dst->data;
 104         dctx->prime_len = sctx->prime_len;
 105         dctx->generator = sctx->generator;
 106         dctx->use_dsa = sctx->use_dsa;
 107         return 1;
 108         }
 109
 110 static void pkey_dh_cleanup(EVP_PKEY_CTX *ctx)
 111         {
 112         DH_PKEY_CTX *dctx = ctx->data;
 113         if (dctx)
 114                 OPENSSL_free(dctx);
 115         }
 116
 117 static int pkey_dh_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
 118         {
 119         DH_PKEY_CTX *dctx = ctx->data;
 120         switch (type)
 121                 {
 122                 case EVP_PKEY_CTRL_DH_PARAMGEN_PRIME_LEN:
 123                 if (p1 < 256)
 124                         return -2;
 125                 dctx->prime_len = p1;
 126                 return 1;
 127
 128                 case EVP_PKEY_CTRL_DH_PARAMGEN_GENERATOR:
 129                 dctx->generator = p1;
 130                 return 1;
 131
 132                 case EVP_PKEY_CTRL_PEER_KEY:
 133                 /* Default behaviour is OK */
 134                 return 1;
 135
 136                 default:
 137                 return -2;
 138
 139                 }
 140         }
 141
 142
 143 static int pkey_dh_ctrl_str(EVP_PKEY_CTX *ctx,
 144                         const char *type, const char *value)
 145         {
 146         if (!strcmp(type, "dh_paramgen_prime_len"))
 147                 {
 148                 int len;
 149                 len = atoi(value);
 150                 return EVP_PKEY_CTX_set_dh_paramgen_prime_len(ctx, len);
 151                 }
 152         if (!strcmp(type, "dh_paramgen_generator"))
 153                 {
 154                 int len;
 155                 len = atoi(value);
 156                 return EVP_PKEY_CTX_set_dh_paramgen_generator(ctx, len);
 157                 }
 158         return -2;
 159         }
 160
 161 static int pkey_dh_paramgen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
 162         {
 163         DH *dh = NULL;
 164         DH_PKEY_CTX *dctx = ctx->data;
 165         BN_GENCB *pcb, cb;
 166         int ret;
 167         if (ctx->pkey_gencb)
 168                 {
 169                 pcb = &cb;
 170                 evp_pkey_set_cb_translate(pcb, ctx);
 171                 }
 172         else
 173                 pcb = NULL;
 174         dh = DH_new();
 175         if (!dh)
 176                 return 0;
 177         ret = DH_generate_parameters_ex(dh,
 178                                         dctx->prime_len, dctx->generator, pcb);
 179         if (ret)
 180                 EVP_PKEY_assign_DH(pkey, dh);
 181         else
 182                 DH_free(dh);
 183         return ret;
 184         }
 185
 186 static int pkey_dh_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
 187         {
 188         DH *dh = NULL;
 189         if (ctx->pkey == NULL)
 190                 {
 191                 DHerr(DH_F_PKEY_DH_KEYGEN, DH_R_NO_PARAMETERS_SET);
 192                 return 0;
 193                 }
 194         dh = DH_new();
 195         if (!dh)
 196                 return 0;
 197         EVP_PKEY_assign_DH(pkey, dh);
 198         /* Note: if error return, pkey is freed by parent routine */
 199         if (!EVP_PKEY_copy_parameters(pkey, ctx->pkey))
 200                 return 0;
 201         return DH_generate_key(pkey->pkey.dh);
 202         }
 203
 204 static int pkey_dh_derive(EVP_PKEY_CTX *ctx, unsigned char *key, size_t *keylen)
 205         {
 206         int ret;
 207         if (!ctx->pkey || !ctx->peerkey)
 208                 {
 209                 DHerr(DH_F_PKEY_DH_DERIVE, DH_R_KEYS_NOT_SET);
 210                 return 0;
 211                 }
 212         ret = DH_compute_key(key, ctx->peerkey->pkey.dh->pub_key,
 213                                                         ctx->pkey->pkey.dh);
 214         if (ret < 0)
 215                 return ret;
 216         *keylen = ret;
 217         return 1;
 218         }
 219
 220 const EVP_PKEY_METHOD dh_pkey_meth =
 221         {
 222         EVP_PKEY_DH,
 223         EVP_PKEY_FLAG_AUTOARGLEN,
 224         pkey_dh_init,
 225         pkey_dh_copy,
 226         pkey_dh_cleanup,
 227
 228         0,
 229         pkey_dh_paramgen,
 230
 231         0,
 232         pkey_dh_keygen,
 233
 234         0,
 235         0,
 236
 237         0,
 238         0,
 239
 240         0,0,
 241
 242         0,0,0,0,
 243
 244         0,0,
 245
 246         0,0,
 247
 248         0,
 249         pkey_dh_derive,
 250
 251         pkey_dh_ctrl,
 252         pkey_dh_ctrl_str
 253
 254         };