release/src/router/openssl/crypto/ec/ec_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/ec.h>
  63 #include <openssl/ecdsa.h>
  64 #include <openssl/evp.h>
  65 #include "evp_locl.h"
  66
  67 /* EC pkey context structure */
  68
  69 typedef struct
  70         {
  71         /* Key and paramgen group */
  72         EC_GROUP *gen_group;
  73         /* message digest */
  74         const EVP_MD *md;
  75         } EC_PKEY_CTX;
  76
  77 static int pkey_ec_init(EVP_PKEY_CTX *ctx)
  78         {
  79         EC_PKEY_CTX *dctx;
  80         dctx = OPENSSL_malloc(sizeof(EC_PKEY_CTX));
  81         if (!dctx)
  82                 return 0;
  83         dctx->gen_group = NULL;
  84         dctx->md = NULL;
  85
  86         ctx->data = dctx;
  87
  88         return 1;
  89         }
  90
  91 static int pkey_ec_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src)
  92         {
  93         EC_PKEY_CTX *dctx, *sctx;
  94         if (!pkey_ec_init(dst))
  95                 return 0;
  96         sctx = src->data;
  97         dctx = dst->data;
  98         if (sctx->gen_group)
  99                 {
 100                 dctx->gen_group = EC_GROUP_dup(sctx->gen_group);
 101                 if (!dctx->gen_group)
 102                         return 0;
 103                 }
 104         dctx->md = sctx->md;
 105         return 1;
 106         }
 107
 108 static void pkey_ec_cleanup(EVP_PKEY_CTX *ctx)
 109         {
 110         EC_PKEY_CTX *dctx = ctx->data;
 111         if (dctx)
 112                 {
 113                 if (dctx->gen_group)
 114                         EC_GROUP_free(dctx->gen_group);
 115                 OPENSSL_free(dctx);
 116                 }
 117         }
 118
 119 static int pkey_ec_sign(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen,
 120                                         const unsigned char *tbs, size_t tbslen)
 121         {
 122         int ret, type;
 123         unsigned int sltmp;
 124         EC_PKEY_CTX *dctx = ctx->data;
 125         EC_KEY *ec = ctx->pkey->pkey.ec;
 126
 127         if (!sig)
 128                 {
 129                 *siglen = ECDSA_size(ec);
 130                 return 1;
 131                 }
 132         else if(*siglen < (size_t)ECDSA_size(ec))
 133                 {
 134                 ECerr(EC_F_PKEY_EC_SIGN, EC_R_BUFFER_TOO_SMALL);
 135                 return 0;
 136                 }
 137
 138         if (dctx->md)
 139                 type = EVP_MD_type(dctx->md);
 140         else
 141                 type = NID_sha1;
 142
 143
 144         ret = ECDSA_sign(type, tbs, tbslen, sig, &sltmp, ec);
 145
 146         if (ret <= 0)
 147                 return ret;
 148         *siglen = (size_t)sltmp;
 149         return 1;
 150         }
 151
 152 static int pkey_ec_verify(EVP_PKEY_CTX *ctx,
 153                                         const unsigned char *sig, size_t siglen,
 154                                         const unsigned char *tbs, size_t tbslen)
 155         {
 156         int ret, type;
 157         EC_PKEY_CTX *dctx = ctx->data;
 158         EC_KEY *ec = ctx->pkey->pkey.ec;
 159
 160         if (dctx->md)
 161                 type = EVP_MD_type(dctx->md);
 162         else
 163                 type = NID_sha1;
 164
 165         ret = ECDSA_verify(type, tbs, tbslen, sig, siglen, ec);
 166
 167         return ret;
 168         }
 169
 170 static int pkey_ec_derive(EVP_PKEY_CTX *ctx, unsigned char *key, size_t *keylen)
 171         {
 172         int ret;
 173         size_t outlen;
 174         const EC_POINT *pubkey = NULL;
 175         if (!ctx->pkey || !ctx->peerkey)
 176                 {
 177                 ECerr(EC_F_PKEY_EC_DERIVE, EC_R_KEYS_NOT_SET);
 178                 return 0;
 179                 }
 180
 181         if (!key)
 182                 {
 183                 const EC_GROUP *group;
 184                 group = EC_KEY_get0_group(ctx->pkey->pkey.ec);
 185                 *keylen = (EC_GROUP_get_degree(group) + 7)/8;
 186                 return 1;
 187                 }
 188
 189         pubkey = EC_KEY_get0_public_key(ctx->peerkey->pkey.ec);
 190
 191         /* NB: unlike PKS#3 DH, if *outlen is less than maximum size this is
 192          * not an error, the result is truncated.
 193          */
 194
 195         outlen = *keylen;
 196
 197         ret = ECDH_compute_key(key, outlen, pubkey, ctx->pkey->pkey.ec, 0);
 198         if (ret < 0)
 199                 return ret;
 200         *keylen = ret;
 201         return 1;
 202         }
 203
 204 static int pkey_ec_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
 205         {
 206         EC_PKEY_CTX *dctx = ctx->data;
 207         EC_GROUP *group;
 208         switch (type)
 209                 {
 210                 case EVP_PKEY_CTRL_EC_PARAMGEN_CURVE_NID:
 211                 group = EC_GROUP_new_by_curve_name(p1);
 212                 if (group == NULL)
 213                         {
 214                         ECerr(EC_F_PKEY_EC_CTRL, EC_R_INVALID_CURVE);
 215                         return 0;
 216                         }
 217                 if (dctx->gen_group)
 218                         EC_GROUP_free(dctx->gen_group);
 219                 dctx->gen_group = group;
 220                 return 1;
 221
 222                 case EVP_PKEY_CTRL_MD:
 223                 if (EVP_MD_type((const EVP_MD *)p2) != NID_sha1 &&
 224                     EVP_MD_type((const EVP_MD *)p2) != NID_ecdsa_with_SHA1 &&
 225                     EVP_MD_type((const EVP_MD *)p2) != NID_sha224 &&
 226                     EVP_MD_type((const EVP_MD *)p2) != NID_sha256 &&
 227                     EVP_MD_type((const EVP_MD *)p2) != NID_sha384 &&
 228                     EVP_MD_type((const EVP_MD *)p2) != NID_sha512)
 229                         {
 230                         ECerr(EC_F_PKEY_EC_CTRL, EC_R_INVALID_DIGEST_TYPE);
 231                         return 0;
 232                         }
 233                 dctx->md = p2;
 234                 return 1;
 235
 236                 case EVP_PKEY_CTRL_PEER_KEY:
 237                 /* Default behaviour is OK */
 238                 case EVP_PKEY_CTRL_DIGESTINIT:
 239                 case EVP_PKEY_CTRL_PKCS7_SIGN:
 240                 case EVP_PKEY_CTRL_CMS_SIGN:
 241                 return 1;
 242
 243                 default:
 244                 return -2;
 245
 246                 }
 247         }
 248
 249 static int pkey_ec_ctrl_str(EVP_PKEY_CTX *ctx,
 250                         const char *type, const char *value)
 251         {
 252         if (!strcmp(type, "ec_paramgen_curve"))
 253                 {
 254                 int nid;
 255                 nid = OBJ_sn2nid(value);
 256                 if (nid == NID_undef)
 257                         nid = OBJ_ln2nid(value);
 258                 if (nid == NID_undef)
 259                         {
 260                         ECerr(EC_F_PKEY_EC_CTRL_STR, EC_R_INVALID_CURVE);
 261                         return 0;
 262                         }
 263                 return EVP_PKEY_CTX_set_ec_paramgen_curve_nid(ctx, nid);
 264                 }
 265         return -2;
 266         }
 267
 268 static int pkey_ec_paramgen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
 269         {
 270         EC_KEY *ec = NULL;
 271         EC_PKEY_CTX *dctx = ctx->data;
 272         int ret = 0;
 273         if (dctx->gen_group == NULL)
 274                 {
 275                 ECerr(EC_F_PKEY_EC_PARAMGEN, EC_R_NO_PARAMETERS_SET);
 276                 return 0;
 277                 }
 278         ec = EC_KEY_new();
 279         if (!ec)
 280                 return 0;
 281         ret = EC_KEY_set_group(ec, dctx->gen_group);
 282         if (ret)
 283                 EVP_PKEY_assign_EC_KEY(pkey, ec);
 284         else
 285                 EC_KEY_free(ec);
 286         return ret;
 287         }
 288
 289 static int pkey_ec_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
 290         {
 291         EC_KEY *ec = NULL;
 292         if (ctx->pkey == NULL)
 293                 {
 294                 ECerr(EC_F_PKEY_EC_KEYGEN, EC_R_NO_PARAMETERS_SET);
 295                 return 0;
 296                 }
 297         ec = EC_KEY_new();
 298         if (!ec)
 299                 return 0;
 300         EVP_PKEY_assign_EC_KEY(pkey, ec);
 301         /* Note: if error return, pkey is freed by parent routine */
 302         if (!EVP_PKEY_copy_parameters(pkey, ctx->pkey))
 303                 return 0;
 304         return EC_KEY_generate_key(pkey->pkey.ec);
 305         }
 306
 307 const EVP_PKEY_METHOD ec_pkey_meth =
 308         {
 309         EVP_PKEY_EC,
 310         0,
 311         pkey_ec_init,
 312         pkey_ec_copy,
 313         pkey_ec_cleanup,
 314
 315         0,
 316         pkey_ec_paramgen,
 317
 318         0,
 319         pkey_ec_keygen,
 320
 321         0,
 322         pkey_ec_sign,
 323
 324         0,
 325         pkey_ec_verify,
 326
 327         0,0,
 328
 329         0,0,0,0,
 330
 331         0,0,
 332
 333         0,0,
 334
 335         0,
 336         pkey_ec_derive,
 337
 338         pkey_ec_ctrl,
 339         pkey_ec_ctrl_str
 340
 341         };