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
  64 /* Minor tweak to operation: free up EVP_PKEY */
  65 static int pubkey_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it)
  66         {
  67         if (operation == ASN1_OP_FREE_POST)
  68                 {
  69                 X509_PUBKEY *pubkey = (X509_PUBKEY *)*pval;
  70                 EVP_PKEY_free(pubkey->pkey);
  71                 }
  72         return 1;
  73         }
  74
  75 ASN1_SEQUENCE_cb(X509_PUBKEY, pubkey_cb) = {
  76         ASN1_SIMPLE(X509_PUBKEY, algor, X509_ALGOR),
  77         ASN1_SIMPLE(X509_PUBKEY, public_key, ASN1_BIT_STRING)
  78 } ASN1_SEQUENCE_END_cb(X509_PUBKEY, X509_PUBKEY)
  79
  80 IMPLEMENT_ASN1_FUNCTIONS(X509_PUBKEY)
  81
  82 int X509_PUBKEY_set(X509_PUBKEY **x, EVP_PKEY *pkey)
  83         {
  84         int ok=0;
  85         X509_PUBKEY *pk;
  86         X509_ALGOR *a;
  87         ASN1_OBJECT *o;
  88         unsigned char *s,*p;
  89         int i;
  90
  91         if (x == NULL) return(0);
  92
  93         if ((pk=X509_PUBKEY_new()) == NULL) goto err;
  94         a=pk->algor;
  95
  96         /* set the algorithm id */
  97         if ((o=OBJ_nid2obj(pkey->type)) == NULL) goto err;
  98         ASN1_OBJECT_free(a->algorithm);
  99         a->algorithm=o;
 100
 101         /* Set the parameter list */
 102         if (!pkey->save_parameters || (pkey->type == EVP_PKEY_RSA))
 103                 {
 104                 if ((a->parameter == NULL) ||
 105                         (a->parameter->type != V_ASN1_NULL))
 106                         {
 107                         ASN1_TYPE_free(a->parameter);
 108                         a->parameter=ASN1_TYPE_new();
 109                         a->parameter->type=V_ASN1_NULL;
 110                         }
 111                 }
 112 #ifndef OPENSSL_NO_DSA
 113         else if (pkey->type == EVP_PKEY_DSA)
 114                 {
 115                 unsigned char *pp;
 116                 DSA *dsa;
 117
 118                 dsa=pkey->pkey.dsa;
 119                 dsa->write_params=0;
 120                 ASN1_TYPE_free(a->parameter);
 121                 i=i2d_DSAparams(dsa,NULL);
 122                 p=(unsigned char *)OPENSSL_malloc(i);
 123                 pp=p;
 124                 i2d_DSAparams(dsa,&pp);
 125                 a->parameter=ASN1_TYPE_new();
 126                 a->parameter->type=V_ASN1_SEQUENCE;
 127                 a->parameter->value.sequence=ASN1_STRING_new();
 128                 ASN1_STRING_set(a->parameter->value.sequence,p,i);
 129                 OPENSSL_free(p);
 130                 }
 131 #endif
 132 #ifndef OPENSSL_NO_ECDSA
 133         else if (pkey->type == EVP_PKEY_ECDSA)
 134                 {
 135                 int nid=0;
 136                 unsigned char *pp;
 137                 ECDSA *ecdsa;
 138
 139                 ecdsa = pkey->pkey.ecdsa;
 140                 ASN1_TYPE_free(a->parameter);
 141
 142                 if ((a->parameter = ASN1_TYPE_new()) == NULL)
 143                         {
 144                         X509err(X509_F_X509_PUBKEY_SET, ERR_R_ASN1_LIB);
 145                         OPENSSL_free(p);
 146                         goto err;
 147                         }
 148
 149                 if ((ECDSA_get_parameter_flags(ecdsa) & ECDSA_FLAG_NAMED_CURVE) && (nid = EC_GROUP_get_nid(ecdsa->group)))
 150                         {
 151                         /* just set the OID */
 152                         a->parameter->type = V_ASN1_OBJECT;
 153                         a->parameter->value.object = OBJ_nid2obj(nid);
 154                         }
 155                 else /* explicit parameters */
 156                         {
 157                         if ((i = i2d_ECDSAParameters(ecdsa, NULL)) == 0)
 158                                 {
 159                                 X509err(X509_F_X509_PUBKEY_SET, ERR_R_ECDSA_LIB);
 160                                 goto err;
 161                                 }
 162                         if ((p = (unsigned char *) OPENSSL_malloc(i)) == NULL)
 163                                 {
 164                                 X509err(X509_F_X509_PUBKEY_SET, ERR_R_MALLOC_FAILURE);
 165                                 goto err;
 166                                 }
 167                         pp = p;
 168                         if (!i2d_ECDSAParameters(ecdsa, &pp))
 169                                 {
 170                                 X509err(X509_F_X509_PUBKEY_SET, ERR_R_ECDSA_LIB);
 171                                 OPENSSL_free(p);
 172                                 goto err;
 173                                 }
 174                         a->parameter->type = V_ASN1_SEQUENCE;
 175                         if ((a->parameter->value.sequence = ASN1_STRING_new()) == NULL)
 176                                 {
 177                                 X509err(X509_F_X509_PUBKEY_SET, ERR_R_ASN1_LIB);
 178                                 OPENSSL_free(p);
 179                                 goto err;
 180                                 }
 181                         ASN1_STRING_set(a->parameter->value.sequence, p, i);
 182                         OPENSSL_free(p);
 183                         }
 184                 }
 185 #endif
 186         else if (1)
 187                 {
 188                 X509err(X509_F_X509_PUBKEY_SET,X509_R_UNSUPPORTED_ALGORITHM);
 189                 goto err;
 190                 }
 191
 192         if ((i=i2d_PublicKey(pkey,NULL)) <= 0) goto err;
 193         if ((s=(unsigned char *)OPENSSL_malloc(i+1)) == NULL) goto err;
 194         p=s;
 195         i2d_PublicKey(pkey,&p);
 196         if (!M_ASN1_BIT_STRING_set(pk->public_key,s,i)) goto err;
 197         /* Set number of unused bits to zero */
 198         pk->public_key->flags&= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07);
 199         pk->public_key->flags|=ASN1_STRING_FLAG_BITS_LEFT;
 200
 201         OPENSSL_free(s);
 202
 203 #if 0
 204         CRYPTO_add(&pkey->references,1,CRYPTO_LOCK_EVP_PKEY);
 205         pk->pkey=pkey;
 206 #endif
 207
 208         if (*x != NULL)
 209                 X509_PUBKEY_free(*x);
 210
 211         *x=pk;
 212         pk=NULL;
 213
 214         ok=1;
 215 err:
 216         if (pk != NULL) X509_PUBKEY_free(pk);
 217         return(ok);
 218         }
 219
 220 EVP_PKEY *X509_PUBKEY_get(X509_PUBKEY *key)
 221         {
 222         EVP_PKEY *ret=NULL;
 223         long j;
 224         int type;
 225         unsigned char *p;
 226 #if !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_ECDSA)
 227         const unsigned char *cp;
 228         X509_ALGOR *a;
 229 #endif
 230
 231         if (key == NULL) goto err;
 232
 233         if (key->pkey != NULL)
 234                 {
 235                 CRYPTO_add(&key->pkey->references, 1, CRYPTO_LOCK_EVP_PKEY);
 236                 return(key->pkey);
 237                 }
 238
 239         if (key->public_key == NULL) goto err;
 240
 241         type=OBJ_obj2nid(key->algor->algorithm);
 242         if ((ret = EVP_PKEY_new()) == NULL)
 243                 {
 244                 X509err(X509_F_X509_PUBKEY_GET, ERR_R_MALLOC_FAILURE);
 245                 goto err;
 246                 }
 247         ret->type = EVP_PKEY_type(type);
 248
 249         /* the parameters must be extracted before the public key (ECDSA!) */
 250
 251 #if !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_ECDSA)
 252         a=key->algor;
 253 #endif
 254
 255         if (0)
 256                 ;
 257 #ifndef OPENSSL_NO_DSA
 258         else if (ret->type == EVP_PKEY_DSA)
 259                 {
 260                 if (a->parameter && (a->parameter->type == V_ASN1_SEQUENCE))
 261                         {
 262                         if ((ret->pkey.dsa = DSA_new()) == NULL)
 263                                 {
 264                                 X509err(X509_F_X509_PUBKEY_GET, ERR_R_MALLOC_FAILURE);
 265                                 goto err;
 266                                 }
 267                         ret->pkey.dsa->write_params=0;
 268                         cp=p=a->parameter->value.sequence->data;
 269                         j=a->parameter->value.sequence->length;
 270                         if (!d2i_DSAparams(&ret->pkey.dsa, &cp, (long)j))
 271                                 goto err;
 272                         }
 273                 ret->save_parameters=1;
 274                 }
 275 #endif
 276 #ifndef OPENSSL_NO_ECDSA
 277         else if (ret->type == EVP_PKEY_ECDSA)
 278                 {
 279                 if (a->parameter && (a->parameter->type == V_ASN1_SEQUENCE))
 280                         {
 281                         /* type == V_ASN1_SEQUENCE => we have explicit parameters
 282                          * (e.g. parameters in the X9_62_EC_PARAMETERS-structure )
 283                          */
 284                         if ((ret->pkey.ecdsa= ECDSA_new()) == NULL)
 285                                 {
 286                                 X509err(X509_F_X509_PUBKEY_GET, ERR_R_MALLOC_FAILURE);
 287                                 goto err;
 288                                 }
 289                         cp = p = a->parameter->value.sequence->data;
 290                         j = a->parameter->value.sequence->length;
 291                         if (!d2i_ECDSAParameters(&ret->pkey.ecdsa, &cp, (long)j))
 292                                 {
 293                                 X509err(X509_F_X509_PUBKEY_GET, ERR_R_ECDSA_LIB);
 294                                 goto err;
 295                                 }
 296                         }
 297                 else if (a->parameter && (a->parameter->type == V_ASN1_OBJECT))
 298                         {
 299                         /* type == V_ASN1_OBJECT => the parameters are given
 300                          * by an asn1 OID
 301                          */
 302                         if (ret->pkey.ecdsa == NULL)
 303                                 ret->pkey.ecdsa = ECDSA_new();
 304                         if (ret->pkey.ecdsa->group)
 305                                 EC_GROUP_free(ret->pkey.ecdsa->group);
 306                         ret->pkey.ecdsa->parameter_flags |= ECDSA_FLAG_NAMED_CURVE;
 307                         if ((ret->pkey.ecdsa->group = EC_GROUP_new_by_name(OBJ_obj2nid(a->parameter->value.object))) == NULL)
 308                                 goto err;
 309                         }
 310                         /* the case implicitlyCA is currently not implemented */
 311                 ret->save_parameters = 1;
 312                 }
 313 #endif
 314
 315         p=key->public_key->data;
 316         j=key->public_key->length;
 317         if ((ret = d2i_PublicKey(type, &ret, &p, (long)j)) == NULL)
 318                 {
 319                 X509err(X509_F_X509_PUBKEY_GET, X509_R_ERR_ASN1_LIB);
 320                 goto err;
 321                 }
 322
 323         key->pkey = ret;
 324         CRYPTO_add(&ret->references, 1, CRYPTO_LOCK_EVP_PKEY);
 325         return(ret);
 326 err:
 327         if (ret != NULL)
 328                 EVP_PKEY_free(ret);
 329         return(NULL);
 330         }
 331
 332 /* Now two pseudo ASN1 routines that take an EVP_PKEY structure
 333  * and encode or decode as X509_PUBKEY
 334  */
 335
 336 EVP_PKEY *d2i_PUBKEY(EVP_PKEY **a, unsigned char **pp,
 337              long length)
 338         {
 339         X509_PUBKEY *xpk;
 340         EVP_PKEY *pktmp;
 341         xpk = d2i_X509_PUBKEY(NULL, pp, length);
 342         if(!xpk) return NULL;
 343         pktmp = X509_PUBKEY_get(xpk);
 344         X509_PUBKEY_free(xpk);
 345         if(!pktmp) return NULL;
 346         if(a)
 347                 {
 348                 EVP_PKEY_free(*a);
 349                 *a = pktmp;
 350                 }
 351         return pktmp;
 352         }
 353
 354 int i2d_PUBKEY(EVP_PKEY *a, unsigned char **pp)
 355         {
 356         X509_PUBKEY *xpk=NULL;
 357         int ret;
 358         if(!a) return 0;
 359         if(!X509_PUBKEY_set(&xpk, a)) return 0;
 360         ret = i2d_X509_PUBKEY(xpk, pp);
 361         X509_PUBKEY_free(xpk);
 362         return ret;
 363         }
 364
 365 /* The following are equivalents but which return RSA and DSA
 366  * keys
 367  */
 368 #ifndef OPENSSL_NO_RSA
 369 RSA *d2i_RSA_PUBKEY(RSA **a, unsigned char **pp,
 370              long length)
 371         {
 372         EVP_PKEY *pkey;
 373         RSA *key;
 374         unsigned char *q;
 375         q = *pp;
 376         pkey = d2i_PUBKEY(NULL, &q, length);
 377         if (!pkey) return NULL;
 378         key = EVP_PKEY_get1_RSA(pkey);
 379         EVP_PKEY_free(pkey);
 380         if (!key) return NULL;
 381         *pp = q;
 382         if (a)
 383                 {
 384                 RSA_free(*a);
 385                 *a = key;
 386                 }
 387         return key;
 388         }
 389
 390 int i2d_RSA_PUBKEY(RSA *a, unsigned char **pp)
 391         {
 392         EVP_PKEY *pktmp;
 393         int ret;
 394         if (!a) return 0;
 395         pktmp = EVP_PKEY_new();
 396         if (!pktmp)
 397                 {
 398                 ASN1err(ASN1_F_I2D_RSA_PUBKEY, ERR_R_MALLOC_FAILURE);
 399                 return 0;
 400                 }
 401         EVP_PKEY_set1_RSA(pktmp, a);
 402         ret = i2d_PUBKEY(pktmp, pp);
 403         EVP_PKEY_free(pktmp);
 404         return ret;
 405         }
 406 #endif
 407
 408 #ifndef OPENSSL_NO_DSA
 409 DSA *d2i_DSA_PUBKEY(DSA **a, unsigned char **pp,
 410              long length)
 411         {
 412         EVP_PKEY *pkey;
 413         DSA *key;
 414         unsigned char *q;
 415         q = *pp;
 416         pkey = d2i_PUBKEY(NULL, &q, length);
 417         if (!pkey) return NULL;
 418         key = EVP_PKEY_get1_DSA(pkey);
 419         EVP_PKEY_free(pkey);
 420         if (!key) return NULL;
 421         *pp = q;
 422         if (a)
 423                 {
 424                 DSA_free(*a);
 425                 *a = key;
 426                 }
 427         return key;
 428         }
 429
 430 int i2d_DSA_PUBKEY(DSA *a, unsigned char **pp)
 431         {
 432         EVP_PKEY *pktmp;
 433         int ret;
 434         if(!a) return 0;
 435         pktmp = EVP_PKEY_new();
 436         if(!pktmp)
 437                 {
 438                 ASN1err(ASN1_F_I2D_DSA_PUBKEY, ERR_R_MALLOC_FAILURE);
 439                 return 0;
 440                 }
 441         EVP_PKEY_set1_DSA(pktmp, a);
 442         ret = i2d_PUBKEY(pktmp, pp);
 443         EVP_PKEY_free(pktmp);
 444         return ret;
 445         }
 446 #endif
 447
 448 #ifndef OPENSSL_NO_ECDSA
 449 ECDSA *d2i_ECDSA_PUBKEY(ECDSA **a, unsigned char **pp, long length)
 450         {
 451         EVP_PKEY *pkey;
 452         ECDSA *key;
 453         unsigned char *q;
 454         q = *pp;
 455         pkey = d2i_PUBKEY(NULL, &q, length);
 456         if (!pkey) return(NULL);
 457         key = EVP_PKEY_get1_ECDSA(pkey);
 458         EVP_PKEY_free(pkey);
 459         if (!key)  return(NULL);
 460         *pp = q;
 461         if (a)
 462                 {
 463                 ECDSA_free(*a);
 464                 *a = key;
 465                 }
 466         return(key);
 467         }
 468
 469 int i2d_ECDSA_PUBKEY(ECDSA *a, unsigned char **pp)
 470         {
 471         EVP_PKEY *pktmp;
 472         int ret;
 473         if (!a) return(0);
 474         if ((pktmp = EVP_PKEY_new()) == NULL)
 475                 {
 476                 ASN1err(ASN1_F_I2D_ECDSA_PUBKEY, ERR_R_MALLOC_FAILURE);
 477                 return(0);
 478                 }
 479         EVP_PKEY_set1_ECDSA(pktmp, a);
 480         ret = i2d_PUBKEY(pktmp, pp);
 481         EVP_PKEY_free(pktmp);
 482         return(ret);
 483         }
 484 #endif