crypto/openssl/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 #ifndef OPENSSL_NO_RSA
  64 #include <openssl/rsa.h>
  65 #endif
  66 #ifndef OPENSSL_NO_DSA
  67 #include <openssl/dsa.h>
  68 #endif
  69
  70 /* Minor tweak to operation: free up EVP_PKEY */
  71 static int pubkey_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it)
  72         {
  73         if (operation == ASN1_OP_FREE_POST)
  74                 {
  75                 X509_PUBKEY *pubkey = (X509_PUBKEY *)*pval;
  76                 EVP_PKEY_free(pubkey->pkey);
  77                 }
  78         return 1;
  79         }
  80
  81 ASN1_SEQUENCE_cb(X509_PUBKEY, pubkey_cb) = {
  82         ASN1_SIMPLE(X509_PUBKEY, algor, X509_ALGOR),
  83         ASN1_SIMPLE(X509_PUBKEY, public_key, ASN1_BIT_STRING)
  84 } ASN1_SEQUENCE_END_cb(X509_PUBKEY, X509_PUBKEY)
  85
  86 IMPLEMENT_ASN1_FUNCTIONS(X509_PUBKEY)
  87
  88 int X509_PUBKEY_set(X509_PUBKEY **x, EVP_PKEY *pkey)
  89         {
  90         X509_PUBKEY *pk=NULL;
  91         X509_ALGOR *a;
  92         ASN1_OBJECT *o;
  93         unsigned char *s,*p = NULL;
  94         int i;
  95
  96         if (x == NULL) return(0);
  97
  98         if ((pk=X509_PUBKEY_new()) == NULL) goto err;
  99         a=pk->algor;
 100
 101         /* set the algorithm id */
 102         if ((o=OBJ_nid2obj(pkey->type)) == NULL) goto err;
 103         ASN1_OBJECT_free(a->algorithm);
 104         a->algorithm=o;
 105
 106         /* Set the parameter list */
 107         if (!pkey->save_parameters || (pkey->type == EVP_PKEY_RSA))
 108                 {
 109                 if ((a->parameter == NULL) ||
 110                         (a->parameter->type != V_ASN1_NULL))
 111                         {
 112                         ASN1_TYPE_free(a->parameter);
 113                         if (!(a->parameter=ASN1_TYPE_new()))
 114                                 {
 115                                 X509err(X509_F_X509_PUBKEY_SET,ERR_R_MALLOC_FAILURE);
 116                                 goto err;
 117                                 }
 118                         a->parameter->type=V_ASN1_NULL;
 119                         }
 120                 }
 121 #ifndef OPENSSL_NO_DSA
 122         else if (pkey->type == EVP_PKEY_DSA)
 123                 {
 124                 unsigned char *pp;
 125                 DSA *dsa;
 126
 127                 dsa=pkey->pkey.dsa;
 128                 dsa->write_params=0;
 129                 ASN1_TYPE_free(a->parameter);
 130                 if ((i=i2d_DSAparams(dsa,NULL)) <= 0)
 131                         goto err;
 132                 if (!(p=(unsigned char *)OPENSSL_malloc(i)))
 133                         {
 134                         X509err(X509_F_X509_PUBKEY_SET,ERR_R_MALLOC_FAILURE);
 135                         goto err;
 136                         }
 137                 pp=p;
 138                 i2d_DSAparams(dsa,&pp);
 139                 if (!(a->parameter=ASN1_TYPE_new()))
 140                         {
 141                         OPENSSL_free(p);
 142                         X509err(X509_F_X509_PUBKEY_SET,ERR_R_MALLOC_FAILURE);
 143                         goto err;
 144                         }
 145                 a->parameter->type=V_ASN1_SEQUENCE;
 146                 if (!(a->parameter->value.sequence=ASN1_STRING_new()))
 147                         {
 148                         OPENSSL_free(p);
 149                         X509err(X509_F_X509_PUBKEY_SET,ERR_R_MALLOC_FAILURE);
 150                         goto err;
 151                         }
 152                 if (!ASN1_STRING_set(a->parameter->value.sequence,p,i))
 153                         {
 154                         OPENSSL_free(p);
 155                         X509err(X509_F_X509_PUBKEY_SET,ERR_R_MALLOC_FAILURE);
 156                         goto err;
 157                         }
 158                 OPENSSL_free(p);
 159                 }
 160 #endif
 161 #ifndef OPENSSL_NO_EC
 162         else if (pkey->type == EVP_PKEY_EC)
 163                 {
 164                 int nid=0;
 165                 unsigned char *pp;
 166                 EC_KEY *ec_key;
 167                 const EC_GROUP *group;
 168
 169                 ec_key = pkey->pkey.ec;
 170                 ASN1_TYPE_free(a->parameter);
 171
 172                 if ((a->parameter = ASN1_TYPE_new()) == NULL)
 173                         {
 174                         X509err(X509_F_X509_PUBKEY_SET, ERR_R_ASN1_LIB);
 175                         goto err;
 176                         }
 177
 178                 group = EC_KEY_get0_group(ec_key);
 179                 if (EC_GROUP_get_asn1_flag(group)
 180                      && (nid = EC_GROUP_get_curve_name(group)))
 181                         {
 182                         /* just set the OID */
 183                         a->parameter->type = V_ASN1_OBJECT;
 184                         a->parameter->value.object = OBJ_nid2obj(nid);
 185                         }
 186                 else /* explicit parameters */
 187                         {
 188                         if ((i = i2d_ECParameters(ec_key, NULL)) == 0)
 189                                 {
 190                                 X509err(X509_F_X509_PUBKEY_SET, ERR_R_EC_LIB);
 191                                 goto err;
 192                                 }
 193                         if ((p = (unsigned char *) OPENSSL_malloc(i)) == NULL)
 194                                 {
 195                                 X509err(X509_F_X509_PUBKEY_SET, ERR_R_MALLOC_FAILURE);
 196                                 goto err;
 197                                 }
 198                         pp = p;
 199                         if (!i2d_ECParameters(ec_key, &pp))
 200                                 {
 201                                 X509err(X509_F_X509_PUBKEY_SET, ERR_R_EC_LIB);
 202                                 OPENSSL_free(p);
 203                                 goto err;
 204                                 }
 205                         a->parameter->type = V_ASN1_SEQUENCE;
 206                         if ((a->parameter->value.sequence = ASN1_STRING_new()) == NULL)
 207                                 {
 208                                 X509err(X509_F_X509_PUBKEY_SET, ERR_R_ASN1_LIB);
 209                                 OPENSSL_free(p);
 210                                 goto err;
 211                                 }
 212                         ASN1_STRING_set(a->parameter->value.sequence, p, i);
 213                         OPENSSL_free(p);
 214                         }
 215                 }
 216 #endif
 217         else if (1)
 218                 {
 219                 X509err(X509_F_X509_PUBKEY_SET,X509_R_UNSUPPORTED_ALGORITHM);
 220                 goto err;
 221                 }
 222
 223         if ((i=i2d_PublicKey(pkey,NULL)) <= 0) goto err;
 224         if ((s=(unsigned char *)OPENSSL_malloc(i+1)) == NULL)
 225                 {
 226                 X509err(X509_F_X509_PUBKEY_SET,ERR_R_MALLOC_FAILURE);
 227                 goto err;
 228                 }
 229         p=s;
 230         i2d_PublicKey(pkey,&p);
 231         if (!M_ASN1_BIT_STRING_set(pk->public_key,s,i))
 232                 {
 233                 X509err(X509_F_X509_PUBKEY_SET,ERR_R_MALLOC_FAILURE);
 234                 goto err;
 235                 }
 236         /* Set number of unused bits to zero */
 237         pk->public_key->flags&= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07);
 238         pk->public_key->flags|=ASN1_STRING_FLAG_BITS_LEFT;
 239
 240         OPENSSL_free(s);
 241
 242 #if 0
 243         CRYPTO_add(&pkey->references,1,CRYPTO_LOCK_EVP_PKEY);
 244         pk->pkey=pkey;
 245 #endif
 246
 247         if (*x != NULL)
 248                 X509_PUBKEY_free(*x);
 249
 250         *x=pk;
 251
 252         return 1;
 253 err:
 254         if (pk != NULL) X509_PUBKEY_free(pk);
 255         return 0;
 256         }
 257
 258 EVP_PKEY *X509_PUBKEY_get(X509_PUBKEY *key)
 259         {
 260         EVP_PKEY *ret=NULL;
 261         long j;
 262         int type;
 263         const unsigned char *p;
 264 #if !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_ECDSA)
 265         const unsigned char *cp;
 266         X509_ALGOR *a;
 267 #endif
 268
 269         if (key == NULL) goto err;
 270
 271         if (key->pkey != NULL)
 272                 {
 273                 CRYPTO_add(&key->pkey->references, 1, CRYPTO_LOCK_EVP_PKEY);
 274                 return(key->pkey);
 275                 }
 276
 277         if (key->public_key == NULL) goto err;
 278
 279         type=OBJ_obj2nid(key->algor->algorithm);
 280         if ((ret = EVP_PKEY_new()) == NULL)
 281                 {
 282                 X509err(X509_F_X509_PUBKEY_GET, ERR_R_MALLOC_FAILURE);
 283                 goto err;
 284                 }
 285         ret->type = EVP_PKEY_type(type);
 286
 287         /* the parameters must be extracted before the public key (ECDSA!) */
 288
 289 #if !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_ECDSA)
 290         a=key->algor;
 291 #endif
 292
 293         if (0)
 294                 ;
 295 #ifndef OPENSSL_NO_DSA
 296         else if (ret->type == EVP_PKEY_DSA)
 297                 {
 298                 if (a->parameter && (a->parameter->type == V_ASN1_SEQUENCE))
 299                         {
 300                         if ((ret->pkey.dsa = DSA_new()) == NULL)
 301                                 {
 302                                 X509err(X509_F_X509_PUBKEY_GET, ERR_R_MALLOC_FAILURE);
 303                                 goto err;
 304                                 }
 305                         ret->pkey.dsa->write_params=0;
 306                         cp=p=a->parameter->value.sequence->data;
 307                         j=a->parameter->value.sequence->length;
 308                         if (!d2i_DSAparams(&ret->pkey.dsa, &cp, (long)j))
 309                                 goto err;
 310                         }
 311                 ret->save_parameters=1;
 312                 }
 313 #endif
 314 #ifndef OPENSSL_NO_EC
 315         else if (ret->type == EVP_PKEY_EC)
 316                 {
 317                 if (a->parameter && (a->parameter->type == V_ASN1_SEQUENCE))
 318                         {
 319                         /* type == V_ASN1_SEQUENCE => we have explicit parameters
 320                          * (e.g. parameters in the X9_62_EC_PARAMETERS-structure )
 321                          */
 322                         if ((ret->pkey.ec= EC_KEY_new()) == NULL)
 323                                 {
 324                                 X509err(X509_F_X509_PUBKEY_GET,
 325                                         ERR_R_MALLOC_FAILURE);
 326                                 goto err;
 327                                 }
 328                         cp = p = a->parameter->value.sequence->data;
 329                         j = a->parameter->value.sequence->length;
 330                         if (!d2i_ECParameters(&ret->pkey.ec, &cp, (long)j))
 331                                 {
 332                                 X509err(X509_F_X509_PUBKEY_GET, ERR_R_EC_LIB);
 333                                 goto err;
 334                                 }
 335                         }
 336                 else if (a->parameter && (a->parameter->type == V_ASN1_OBJECT))
 337                         {
 338                         /* type == V_ASN1_OBJECT => the parameters are given
 339                          * by an asn1 OID
 340                          */
 341                         EC_KEY   *ec_key;
 342                         EC_GROUP *group;
 343
 344                         if (ret->pkey.ec == NULL)
 345                                 ret->pkey.ec = EC_KEY_new();
 346                         ec_key = ret->pkey.ec;
 347                         if (ec_key == NULL)
 348                                 goto err;
 349                         group = EC_GROUP_new_by_curve_name(OBJ_obj2nid(a->parameter->value.object));
 350                         if (group == NULL)
 351                                 goto err;
 352                         EC_GROUP_set_asn1_flag(group, OPENSSL_EC_NAMED_CURVE);
 353                         if (EC_KEY_set_group(ec_key, group) == 0)
 354                                 goto err;
 355                         EC_GROUP_free(group);
 356                         }
 357                         /* the case implicitlyCA is currently not implemented */
 358                 ret->save_parameters = 1;
 359                 }
 360 #endif
 361
 362         p=key->public_key->data;
 363         j=key->public_key->length;
 364         if (!d2i_PublicKey(type, &ret, &p, (long)j))
 365                 {
 366                 X509err(X509_F_X509_PUBKEY_GET, X509_R_ERR_ASN1_LIB);
 367                 goto err;
 368                 }
 369
 370         key->pkey = ret;
 371         CRYPTO_add(&ret->references, 1, CRYPTO_LOCK_EVP_PKEY);
 372         return(ret);
 373 err:
 374         if (ret != NULL)
 375                 EVP_PKEY_free(ret);
 376         return(NULL);
 377         }
 378
 379 /* Now two pseudo ASN1 routines that take an EVP_PKEY structure
 380  * and encode or decode as X509_PUBKEY
 381  */
 382
 383 EVP_PKEY *d2i_PUBKEY(EVP_PKEY **a, const unsigned char **pp,
 384              long length)
 385         {
 386         X509_PUBKEY *xpk;
 387         EVP_PKEY *pktmp;
 388         xpk = d2i_X509_PUBKEY(NULL, pp, length);
 389         if(!xpk) return NULL;
 390         pktmp = X509_PUBKEY_get(xpk);
 391         X509_PUBKEY_free(xpk);
 392         if(!pktmp) return NULL;
 393         if(a)
 394                 {
 395                 EVP_PKEY_free(*a);
 396                 *a = pktmp;
 397                 }
 398         return pktmp;
 399         }
 400
 401 int i2d_PUBKEY(EVP_PKEY *a, unsigned char **pp)
 402         {
 403         X509_PUBKEY *xpk=NULL;
 404         int ret;
 405         if(!a) return 0;
 406         if(!X509_PUBKEY_set(&xpk, a)) return 0;
 407         ret = i2d_X509_PUBKEY(xpk, pp);
 408         X509_PUBKEY_free(xpk);
 409         return ret;
 410         }
 411
 412 /* The following are equivalents but which return RSA and DSA
 413  * keys
 414  */
 415 #ifndef OPENSSL_NO_RSA
 416 RSA *d2i_RSA_PUBKEY(RSA **a, const unsigned char **pp,
 417              long length)
 418         {
 419         EVP_PKEY *pkey;
 420         RSA *key;
 421         const unsigned char *q;
 422         q = *pp;
 423         pkey = d2i_PUBKEY(NULL, &q, length);
 424         if (!pkey) return NULL;
 425         key = EVP_PKEY_get1_RSA(pkey);
 426         EVP_PKEY_free(pkey);
 427         if (!key) return NULL;
 428         *pp = q;
 429         if (a)
 430                 {
 431                 RSA_free(*a);
 432                 *a = key;
 433                 }
 434         return key;
 435         }
 436
 437 int i2d_RSA_PUBKEY(RSA *a, unsigned char **pp)
 438         {
 439         EVP_PKEY *pktmp;
 440         int ret;
 441         if (!a) return 0;
 442         pktmp = EVP_PKEY_new();
 443         if (!pktmp)
 444                 {
 445                 ASN1err(ASN1_F_I2D_RSA_PUBKEY, ERR_R_MALLOC_FAILURE);
 446                 return 0;
 447                 }
 448         EVP_PKEY_set1_RSA(pktmp, a);
 449         ret = i2d_PUBKEY(pktmp, pp);
 450         EVP_PKEY_free(pktmp);
 451         return ret;
 452         }
 453 #endif
 454
 455 #ifndef OPENSSL_NO_DSA
 456 DSA *d2i_DSA_PUBKEY(DSA **a, const unsigned char **pp,
 457              long length)
 458         {
 459         EVP_PKEY *pkey;
 460         DSA *key;
 461         const unsigned char *q;
 462         q = *pp;
 463         pkey = d2i_PUBKEY(NULL, &q, length);
 464         if (!pkey) return NULL;
 465         key = EVP_PKEY_get1_DSA(pkey);
 466         EVP_PKEY_free(pkey);
 467         if (!key) return NULL;
 468         *pp = q;
 469         if (a)
 470                 {
 471                 DSA_free(*a);
 472                 *a = key;
 473                 }
 474         return key;
 475         }
 476
 477 int i2d_DSA_PUBKEY(DSA *a, unsigned char **pp)
 478         {
 479         EVP_PKEY *pktmp;
 480         int ret;
 481         if(!a) return 0;
 482         pktmp = EVP_PKEY_new();
 483         if(!pktmp)
 484                 {
 485                 ASN1err(ASN1_F_I2D_DSA_PUBKEY, ERR_R_MALLOC_FAILURE);
 486                 return 0;
 487                 }
 488         EVP_PKEY_set1_DSA(pktmp, a);
 489         ret = i2d_PUBKEY(pktmp, pp);
 490         EVP_PKEY_free(pktmp);
 491         return ret;
 492         }
 493 #endif
 494
 495 #ifndef OPENSSL_NO_EC
 496 EC_KEY *d2i_EC_PUBKEY(EC_KEY **a, const unsigned char **pp, long length)
 497         {
 498         EVP_PKEY *pkey;
 499         EC_KEY *key;
 500         const unsigned char *q;
 501         q = *pp;
 502         pkey = d2i_PUBKEY(NULL, &q, length);
 503         if (!pkey) return(NULL);
 504         key = EVP_PKEY_get1_EC_KEY(pkey);
 505         EVP_PKEY_free(pkey);
 506         if (!key)  return(NULL);
 507         *pp = q;
 508         if (a)
 509                 {
 510                 EC_KEY_free(*a);
 511                 *a = key;
 512                 }
 513         return(key);
 514         }
 515
 516 int i2d_EC_PUBKEY(EC_KEY *a, unsigned char **pp)
 517         {
 518         EVP_PKEY *pktmp;
 519         int ret;
 520         if (!a) return(0);
 521         if ((pktmp = EVP_PKEY_new()) == NULL)
 522                 {
 523                 ASN1err(ASN1_F_I2D_EC_PUBKEY, ERR_R_MALLOC_FAILURE);
 524                 return(0);
 525                 }
 526         EVP_PKEY_set1_EC_KEY(pktmp, a);
 527         ret = i2d_PUBKEY(pktmp, pp);
 528         EVP_PKEY_free(pktmp);
 529         return(ret);
 530         }
 531 #endif