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