crypto/openssl-0.9/crypto/asn1/x_pubkey.c

   1 /* crypto/asn1/x_pubkey.c */
   2 /* Copyright (C) 1995-1998 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 <openssl/asn1t.h>
  62 #include <openssl/x509.h>
  63 #include <openssl/rsa.h>
  64 #include <openssl/dsa.h>
  65
  66 /* Minor tweak to operation: free up EVP_PKEY */
  67 static int pubkey_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it)
  68         {
  69         if (operation == ASN1_OP_FREE_POST)
  70                 {
  71                 X509_PUBKEY *pubkey = (X509_PUBKEY *)*pval;
  72                 EVP_PKEY_free(pubkey->pkey);
  73                 }
  74         return 1;
  75         }
  76
  77 ASN1_SEQUENCE_cb(X509_PUBKEY, pubkey_cb) = {
  78         ASN1_SIMPLE(X509_PUBKEY, algor, X509_ALGOR),
  79         ASN1_SIMPLE(X509_PUBKEY, public_key, ASN1_BIT_STRING)
  80 } ASN1_SEQUENCE_END_cb(X509_PUBKEY, X509_PUBKEY)
  81
  82 IMPLEMENT_ASN1_FUNCTIONS(X509_PUBKEY)
  83
  84 int X509_PUBKEY_set(X509_PUBKEY **x, EVP_PKEY *pkey)
  85         {
  86         X509_PUBKEY *pk=NULL;
  87         X509_ALGOR *a;
  88         ASN1_OBJECT *o;
  89         unsigned char *s,*p = NULL;
  90         int i;
  91
  92         if (x == NULL) return(0);
  93
  94         if ((pk=X509_PUBKEY_new()) == NULL) goto err;
  95         a=pk->algor;
  96
  97         /* set the algorithm id */
  98         if ((o=OBJ_nid2obj(pkey->type)) == NULL) goto err;
  99         ASN1_OBJECT_free(a->algorithm);
 100         a->algorithm=o;
 101
 102         /* Set the parameter list */
 103         if (!pkey->save_parameters || (pkey->type == EVP_PKEY_RSA))
 104                 {
 105                 if ((a->parameter == NULL) ||
 106                         (a->parameter->type != V_ASN1_NULL))
 107                         {
 108                         ASN1_TYPE_free(a->parameter);
 109                         if (!(a->parameter=ASN1_TYPE_new()))
 110                                 {
 111                                 X509err(X509_F_X509_PUBKEY_SET,ERR_R_MALLOC_FAILURE);
 112                                 goto err;
 113                                 }
 114                         a->parameter->type=V_ASN1_NULL;
 115                         }
 116                 }
 117 #ifndef OPENSSL_NO_DSA
 118         else if (pkey->type == EVP_PKEY_DSA)
 119                 {
 120                 unsigned char *pp;
 121                 DSA *dsa;
 122
 123                 dsa=pkey->pkey.dsa;
 124                 dsa->write_params=0;
 125                 ASN1_TYPE_free(a->parameter);
 126                 if ((i=i2d_DSAparams(dsa,NULL)) <= 0)
 127                         goto err;
 128                 if (!(p=(unsigned char *)OPENSSL_malloc(i)))
 129                         {
 130                         X509err(X509_F_X509_PUBKEY_SET,ERR_R_MALLOC_FAILURE);
 131                         goto err;
 132                         }
 133                 pp=p;
 134                 i2d_DSAparams(dsa,&pp);
 135                 if (!(a->parameter=ASN1_TYPE_new()))
 136                         {
 137                         OPENSSL_free(p);
 138                         X509err(X509_F_X509_PUBKEY_SET,ERR_R_MALLOC_FAILURE);
 139                         goto err;
 140                         }
 141                 a->parameter->type=V_ASN1_SEQUENCE;
 142                 if (!(a->parameter->value.sequence=ASN1_STRING_new()))
 143                         {
 144                         OPENSSL_free(p);
 145                         X509err(X509_F_X509_PUBKEY_SET,ERR_R_MALLOC_FAILURE);
 146                         goto err;
 147                         }
 148                 if (!ASN1_STRING_set(a->parameter->value.sequence,p,i))
 149                         {
 150                         OPENSSL_free(p);
 151                         X509err(X509_F_X509_PUBKEY_SET,ERR_R_MALLOC_FAILURE);
 152                         goto err;
 153                         }
 154                 OPENSSL_free(p);
 155                 }
 156 #endif
 157 #ifndef OPENSSL_NO_EC
 158         else if (pkey->type == EVP_PKEY_EC)
 159                 {
 160                 int nid=0;
 161                 unsigned char *pp;
 162                 EC_KEY *ec_key;
 163                 const EC_GROUP *group;
 164
 165                 ec_key = pkey->pkey.ec;
 166                 ASN1_TYPE_free(a->parameter);
 167
 168                 if ((a->parameter = ASN1_TYPE_new()) == NULL)
 169                         {
 170                         X509err(X509_F_X509_PUBKEY_SET, ERR_R_ASN1_LIB);
 171                         goto err;
 172                         }
 173
 174                 group = EC_KEY_get0_group(ec_key);
 175                 if (EC_GROUP_get_asn1_flag(group)
 176                      && (nid = EC_GROUP_get_curve_name(group)))
 177                         {
 178                         /* just set the OID */
 179                         a->parameter->type = V_ASN1_OBJECT;
 180                         a->parameter->value.object = OBJ_nid2obj(nid);
 181                         }
 182                 else /* explicit parameters */
 183                         {
 184                         if ((i = i2d_ECParameters(ec_key, NULL)) == 0)
 185                                 {
 186                                 X509err(X509_F_X509_PUBKEY_SET, ERR_R_EC_LIB);
 187                                 goto err;
 188                                 }
 189                         if ((p = (unsigned char *) OPENSSL_malloc(i)) == NULL)
 190                                 {
 191                                 X509err(X509_F_X509_PUBKEY_SET, ERR_R_MALLOC_FAILURE);
 192                                 goto err;
 193                                 }
 194                         pp = p;
 195                         if (!i2d_ECParameters(ec_key, &pp))
 196                                 {
 197                                 X509err(X509_F_X509_PUBKEY_SET, ERR_R_EC_LIB);
 198                                 OPENSSL_free(p);
 199                                 goto err;
 200                                 }
 201                         a->parameter->type = V_ASN1_SEQUENCE;
 202                         if ((a->parameter->value.sequence = ASN1_STRING_new()) == NULL)
 203                                 {
 204                                 X509err(X509_F_X509_PUBKEY_SET, ERR_R_ASN1_LIB);
 205                                 OPENSSL_free(p);
 206                                 goto err;
 207                                 }
 208                         ASN1_STRING_set(a->parameter->value.sequence, p, i);
 209                         OPENSSL_free(p);
 210                         }
 211                 }
 212 #endif
 213         else if (1)
 214                 {
 215                 X509err(X509_F_X509_PUBKEY_SET,X509_R_UNSUPPORTED_ALGORITHM);
 216                 goto err;
 217                 }
 218
 219         if ((i=i2d_PublicKey(pkey,NULL)) <= 0) goto err;
 220         if ((s=(unsigned char *)OPENSSL_malloc(i+1)) == NULL)
 221                 {
 222                 X509err(X509_F_X509_PUBKEY_SET,ERR_R_MALLOC_FAILURE);
 223                 goto err;
 224                 }
 225         p=s;
 226         i2d_PublicKey(pkey,&p);
 227         if (!M_ASN1_BIT_STRING_set(pk->public_key,s,i))
 228                 {
 229                 X509err(X509_F_X509_PUBKEY_SET,ERR_R_MALLOC_FAILURE);
 230                 goto err;
 231                 }
 232         /* Set number of unused bits to zero */
 233         pk->public_key->flags&= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07);
 234         pk->public_key->flags|=ASN1_STRING_FLAG_BITS_LEFT;
 235
 236         OPENSSL_free(s);
 237
 238 #if 0
 239         CRYPTO_add(&pkey->references,1,CRYPTO_LOCK_EVP_PKEY);
 240         pk->pkey=pkey;
 241 #endif
 242
 243         if (*x != NULL)
 244                 X509_PUBKEY_free(*x);
 245
 246         *x=pk;
 247
 248         return 1;
 249 err:
 250         if (pk != NULL) X509_PUBKEY_free(pk);
 251         return 0;
 252         }
 253
 254 EVP_PKEY *X509_PUBKEY_get(X509_PUBKEY *key)
 255         {
 256         EVP_PKEY *ret=NULL;
 257         long j;
 258         int type;
 259         const unsigned char *p;
 260 #if !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_ECDSA)
 261         const unsigned char *cp;
 262         X509_ALGOR *a;
 263 #endif
 264
 265         if (key == NULL) goto err;
 266
 267         if (key->pkey != NULL)
 268                 {
 269                 CRYPTO_add(&key->pkey->references, 1, CRYPTO_LOCK_EVP_PKEY);
 270                 return(key->pkey);
 271                 }
 272
 273         if (key->public_key == NULL) goto err;
 274
 275         type=OBJ_obj2nid(key->algor->algorithm);
 276         if ((ret = EVP_PKEY_new()) == NULL)
 277                 {
 278                 X509err(X509_F_X509_PUBKEY_GET, ERR_R_MALLOC_FAILURE);
 279                 goto err;
 280                 }
 281         ret->type = EVP_PKEY_type(type);
 282
 283         /* the parameters must be extracted before the public key (ECDSA!) */
 284
 285 #if !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_ECDSA)
 286         a=key->algor;
 287 #endif
 288
 289         if (0)
 290                 ;
 291 #ifndef OPENSSL_NO_DSA
 292         else if (ret->type == EVP_PKEY_DSA)
 293                 {
 294                 if (a->parameter && (a->parameter->type == V_ASN1_SEQUENCE))
 295                         {
 296                         if ((ret->pkey.dsa = DSA_new()) == NULL)
 297                                 {
 298                                 X509err(X509_F_X509_PUBKEY_GET, ERR_R_MALLOC_FAILURE);
 299                                 goto err;
 300                                 }
 301                         ret->pkey.dsa->write_params=0;
 302                         cp=p=a->parameter->value.sequence->data;
 303                         j=a->parameter->value.sequence->length;
 304                         if (!d2i_DSAparams(&ret->pkey.dsa, &cp, (long)j))
 305                                 goto err;
 306                         }
 307                 ret->save_parameters=1;
 308                 }
 309 #endif
 310 #ifndef OPENSSL_NO_EC
 311         else if (ret->type == EVP_PKEY_EC)
 312                 {
 313                 if (a->parameter && (a->parameter->type == V_ASN1_SEQUENCE))
 314                         {
 315                         /* type == V_ASN1_SEQUENCE => we have explicit parameters
 316                          * (e.g. parameters in the X9_62_EC_PARAMETERS-structure )
 317                          */
 318                         if ((ret->pkey.ec= EC_KEY_new()) == NULL)
 319                                 {
 320                                 X509err(X509_F_X509_PUBKEY_GET,
 321                                         ERR_R_MALLOC_FAILURE);
 322                                 goto err;
 323                                 }
 324                         cp = p = a->parameter->value.sequence->data;
 325                         j = a->parameter->value.sequence->length;
 326                         if (!d2i_ECParameters(&ret->pkey.ec, &cp, (long)j))
 327                                 {
 328                                 X509err(X509_F_X509_PUBKEY_GET, ERR_R_EC_LIB);
 329                                 goto err;
 330                                 }
 331                         }
 332                 else if (a->parameter && (a->parameter->type == V_ASN1_OBJECT))
 333                         {
 334                         /* type == V_ASN1_OBJECT => the parameters are given
 335                          * by an asn1 OID
 336                          */
 337                         EC_KEY   *ec_key;
 338                         EC_GROUP *group;
 339
 340                         if (ret->pkey.ec == NULL)
 341                                 ret->pkey.ec = EC_KEY_new();
 342                         ec_key = ret->pkey.ec;
 343                         if (ec_key == NULL)
 344                                 goto err;
 345                         group = EC_GROUP_new_by_curve_name(OBJ_obj2nid(a->parameter->value.object));
 346                         if (group == NULL)
 347                                 goto err;
 348                         EC_GROUP_set_asn1_flag(group, OPENSSL_EC_NAMED_CURVE);
 349                         if (EC_KEY_set_group(ec_key, group) == 0)
 350                                 goto err;
 351                         EC_GROUP_free(group);
 352                         }
 353                         /* the case implicitlyCA is currently not implemented */
 354                 ret->save_parameters = 1;
 355                 }
 356 #endif
 357
 358         p=key->public_key->data;
 359         j=key->public_key->length;
 360         if (!d2i_PublicKey(type, &ret, &p, (long)j))
 361                 {
 362                 X509err(X509_F_X509_PUBKEY_GET, X509_R_ERR_ASN1_LIB);
 363                 goto err;
 364                 }
 365
 366         key->pkey = ret;
 367         CRYPTO_add(&ret->references, 1, CRYPTO_LOCK_EVP_PKEY);
 368         return(ret);
 369 err:
 370         if (ret != NULL)
 371                 EVP_PKEY_free(ret);
 372         return(NULL);
 373         }
 374
 375 /* Now two pseudo ASN1 routines that take an EVP_PKEY structure
 376  * and encode or decode as X509_PUBKEY
 377  */
 378
 379 EVP_PKEY *d2i_PUBKEY(EVP_PKEY **a, const unsigned char **pp,
 380              long length)
 381         {
 382         X509_PUBKEY *xpk;
 383         EVP_PKEY *pktmp;
 384         xpk = d2i_X509_PUBKEY(NULL, pp, length);
 385         if(!xpk) return NULL;
 386         pktmp = X509_PUBKEY_get(xpk);
 387         X509_PUBKEY_free(xpk);
 388         if(!pktmp) return NULL;
 389         if(a)
 390                 {
 391                 EVP_PKEY_free(*a);
 392                 *a = pktmp;
 393                 }
 394         return pktmp;
 395         }
 396
 397 int i2d_PUBKEY(EVP_PKEY *a, unsigned char **pp)
 398         {
 399         X509_PUBKEY *xpk=NULL;
 400         int ret;
 401         if(!a) return 0;
 402         if(!X509_PUBKEY_set(&xpk, a)) return 0;
 403         ret = i2d_X509_PUBKEY(xpk, pp);
 404         X509_PUBKEY_free(xpk);
 405         return ret;
 406         }
 407
 408 /* The following are equivalents but which return RSA and DSA
 409  * keys
 410  */
 411 #ifndef OPENSSL_NO_RSA
 412 RSA *d2i_RSA_PUBKEY(RSA **a, const unsigned char **pp,
 413              long length)
 414         {
 415         EVP_PKEY *pkey;
 416         RSA *key;
 417         const unsigned char *q;
 418         q = *pp;
 419         pkey = d2i_PUBKEY(NULL, &q, length);
 420         if (!pkey) return NULL;
 421         key = EVP_PKEY_get1_RSA(pkey);
 422         EVP_PKEY_free(pkey);
 423         if (!key) return NULL;
 424         *pp = q;
 425         if (a)
 426                 {
 427                 RSA_free(*a);
 428                 *a = key;
 429                 }
 430         return key;
 431         }
 432
 433 int i2d_RSA_PUBKEY(RSA *a, unsigned char **pp)
 434         {
 435         EVP_PKEY *pktmp;
 436         int ret;
 437         if (!a) return 0;
 438         pktmp = EVP_PKEY_new();
 439         if (!pktmp)
 440                 {
 441                 ASN1err(ASN1_F_I2D_RSA_PUBKEY, ERR_R_MALLOC_FAILURE);
 442                 return 0;
 443                 }
 444         EVP_PKEY_set1_RSA(pktmp, a);
 445         ret = i2d_PUBKEY(pktmp, pp);
 446         EVP_PKEY_free(pktmp);
 447         return ret;
 448         }
 449 #endif
 450
 451 #ifndef OPENSSL_NO_DSA
 452 DSA *d2i_DSA_PUBKEY(DSA **a, const unsigned char **pp,
 453              long length)
 454         {
 455         EVP_PKEY *pkey;
 456         DSA *key;
 457         const unsigned char *q;
 458         q = *pp;
 459         pkey = d2i_PUBKEY(NULL, &q, length);
 460         if (!pkey) return NULL;
 461         key = EVP_PKEY_get1_DSA(pkey);
 462         EVP_PKEY_free(pkey);
 463         if (!key) return NULL;
 464         *pp = q;
 465         if (a)
 466                 {
 467                 DSA_free(*a);
 468                 *a = key;
 469                 }
 470         return key;
 471         }
 472
 473 int i2d_DSA_PUBKEY(DSA *a, unsigned char **pp)
 474         {
 475         EVP_PKEY *pktmp;
 476         int ret;
 477         if(!a) return 0;
 478         pktmp = EVP_PKEY_new();
 479         if(!pktmp)
 480                 {
 481                 ASN1err(ASN1_F_I2D_DSA_PUBKEY, ERR_R_MALLOC_FAILURE);
 482                 return 0;
 483                 }
 484         EVP_PKEY_set1_DSA(pktmp, a);
 485         ret = i2d_PUBKEY(pktmp, pp);
 486         EVP_PKEY_free(pktmp);
 487         return ret;
 488         }
 489 #endif
 490
 491 #ifndef OPENSSL_NO_EC
 492 EC_KEY *d2i_EC_PUBKEY(EC_KEY **a, const unsigned char **pp, long length)
 493         {
 494         EVP_PKEY *pkey;
 495         EC_KEY *key;
 496         const unsigned char *q;
 497         q = *pp;
 498         pkey = d2i_PUBKEY(NULL, &q, length);
 499         if (!pkey) return(NULL);
 500         key = EVP_PKEY_get1_EC_KEY(pkey);
 501         EVP_PKEY_free(pkey);
 502         if (!key)  return(NULL);
 503         *pp = q;
 504         if (a)
 505                 {
 506                 EC_KEY_free(*a);
 507                 *a = key;
 508                 }
 509         return(key);
 510         }
 511
 512 int i2d_EC_PUBKEY(EC_KEY *a, unsigned char **pp)
 513         {
 514         EVP_PKEY *pktmp;
 515         int ret;
 516         if (!a) return(0);
 517         if ((pktmp = EVP_PKEY_new()) == NULL)
 518                 {
 519                 ASN1err(ASN1_F_I2D_EC_PUBKEY, ERR_R_MALLOC_FAILURE);
 520                 return(0);
 521                 }
 522         EVP_PKEY_set1_EC_KEY(pktmp, a);
 523         ret = i2d_PUBKEY(pktmp, pp);
 524         EVP_PKEY_free(pktmp);
 525         return(ret);
 526         }
 527 #endif