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 = NULL;
  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                 if ((p=(unsigned char *)OPENSSL_malloc(i)) == NULL) goto err;
 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                         goto err;
 146                         }
 147
 148                 if ((EC_GROUP_get_asn1_flag(ecdsa->group) & OPENSSL_EC_NAMED_CURVE)
 149                      && (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)
 194                 {
 195                 X509err(X509_F_X509_PUBKEY_SET,ERR_R_MALLOC_FAILURE);
 196                 goto err;
 197                 }
 198         p=s;
 199         i2d_PublicKey(pkey,&p);
 200         if (!M_ASN1_BIT_STRING_set(pk->public_key,s,i)) goto err;
 201         /* Set number of unused bits to zero */
 202         pk->public_key->flags&= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07);
 203         pk->public_key->flags|=ASN1_STRING_FLAG_BITS_LEFT;
 204
 205         OPENSSL_free(s);
 206
 207 #if 0
 208         CRYPTO_add(&pkey->references,1,CRYPTO_LOCK_EVP_PKEY);
 209         pk->pkey=pkey;
 210 #endif
 211
 212         if (*x != NULL)
 213                 X509_PUBKEY_free(*x);
 214
 215         *x=pk;
 216         pk=NULL;
 217
 218         ok=1;
 219 err:
 220         if (pk != NULL) X509_PUBKEY_free(pk);
 221         return(ok);
 222         }
 223
 224 EVP_PKEY *X509_PUBKEY_get(X509_PUBKEY *key)
 225         {
 226         EVP_PKEY *ret=NULL;
 227         long j;
 228         int type;
 229         unsigned char *p;
 230 #if !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_ECDSA)
 231         const unsigned char *cp;
 232         X509_ALGOR *a;
 233 #endif
 234
 235         if (key == NULL) goto err;
 236
 237         if (key->pkey != NULL)
 238                 {
 239                 CRYPTO_add(&key->pkey->references, 1, CRYPTO_LOCK_EVP_PKEY);
 240                 return(key->pkey);
 241                 }
 242
 243         if (key->public_key == NULL) goto err;
 244
 245         type=OBJ_obj2nid(key->algor->algorithm);
 246         if ((ret = EVP_PKEY_new()) == NULL)
 247                 {
 248                 X509err(X509_F_X509_PUBKEY_GET, ERR_R_MALLOC_FAILURE);
 249                 goto err;
 250                 }
 251         ret->type = EVP_PKEY_type(type);
 252
 253         /* the parameters must be extracted before the public key (ECDSA!) */
 254
 255 #if !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_ECDSA)
 256         a=key->algor;
 257 #endif
 258
 259         if (0)
 260                 ;
 261 #ifndef OPENSSL_NO_DSA
 262         else if (ret->type == EVP_PKEY_DSA)
 263                 {
 264                 if (a->parameter && (a->parameter->type == V_ASN1_SEQUENCE))
 265                         {
 266                         if ((ret->pkey.dsa = DSA_new()) == NULL)
 267                                 {
 268                                 X509err(X509_F_X509_PUBKEY_GET, ERR_R_MALLOC_FAILURE);
 269                                 goto err;
 270                                 }
 271                         ret->pkey.dsa->write_params=0;
 272                         cp=p=a->parameter->value.sequence->data;
 273                         j=a->parameter->value.sequence->length;
 274                         if (!d2i_DSAparams(&ret->pkey.dsa, &cp, (long)j))
 275                                 goto err;
 276                         }
 277                 ret->save_parameters=1;
 278                 }
 279 #endif
 280 #ifndef OPENSSL_NO_ECDSA
 281         else if (ret->type == EVP_PKEY_ECDSA)
 282                 {
 283                 if (a->parameter && (a->parameter->type == V_ASN1_SEQUENCE))
 284                         {
 285                         /* type == V_ASN1_SEQUENCE => we have explicit parameters
 286                          * (e.g. parameters in the X9_62_EC_PARAMETERS-structure )
 287                          */
 288                         if ((ret->pkey.ecdsa= ECDSA_new()) == NULL)
 289                                 {
 290                                 X509err(X509_F_X509_PUBKEY_GET, ERR_R_MALLOC_FAILURE);
 291                                 goto err;
 292                                 }
 293                         cp = p = a->parameter->value.sequence->data;
 294                         j = a->parameter->value.sequence->length;
 295                         if (!d2i_ECDSAParameters(&ret->pkey.ecdsa, &cp, (long)j))
 296                                 {
 297                                 X509err(X509_F_X509_PUBKEY_GET, ERR_R_ECDSA_LIB);
 298                                 goto err;
 299                                 }
 300                         }
 301                 else if (a->parameter && (a->parameter->type == V_ASN1_OBJECT))
 302                         {
 303                         /* type == V_ASN1_OBJECT => the parameters are given
 304                          * by an asn1 OID
 305                          */
 306                         ECDSA *ecdsa;
 307                         if (ret->pkey.ecdsa == NULL)
 308                                 ret->pkey.ecdsa = ECDSA_new();
 309                         ecdsa = ret->pkey.ecdsa;
 310                         if (ecdsa->group)
 311                                 EC_GROUP_free(ecdsa->group);
 312                         if ((ecdsa->group = EC_GROUP_new_by_name(
 313                              OBJ_obj2nid(a->parameter->value.object))) == NULL)
 314                                 goto err;
 315                         EC_GROUP_set_asn1_flag(ecdsa->group, OPENSSL_EC_NAMED_CURVE |
 316                                (EC_GROUP_get_asn1_flag(ecdsa->group) & ~0x03));
 317                         }
 318                         /* the case implicitlyCA is currently not implemented */
 319                 ret->save_parameters = 1;
 320                 }
 321 #endif
 322
 323         p=key->public_key->data;
 324         j=key->public_key->length;
 325         if ((ret = d2i_PublicKey(type, &ret, &p, (long)j)) == NULL)
 326                 {
 327                 X509err(X509_F_X509_PUBKEY_GET, X509_R_ERR_ASN1_LIB);
 328                 goto err;
 329                 }
 330
 331         key->pkey = ret;
 332         CRYPTO_add(&ret->references, 1, CRYPTO_LOCK_EVP_PKEY);
 333         return(ret);
 334 err:
 335         if (ret != NULL)
 336                 EVP_PKEY_free(ret);
 337         return(NULL);
 338         }
 339
 340 /* Now two pseudo ASN1 routines that take an EVP_PKEY structure
 341  * and encode or decode as X509_PUBKEY
 342  */
 343
 344 EVP_PKEY *d2i_PUBKEY(EVP_PKEY **a, unsigned char **pp,
 345              long length)
 346         {
 347         X509_PUBKEY *xpk;
 348         EVP_PKEY *pktmp;
 349         xpk = d2i_X509_PUBKEY(NULL, pp, length);
 350         if(!xpk) return NULL;
 351         pktmp = X509_PUBKEY_get(xpk);
 352         X509_PUBKEY_free(xpk);
 353         if(!pktmp) return NULL;
 354         if(a)
 355                 {
 356                 EVP_PKEY_free(*a);
 357                 *a = pktmp;
 358                 }
 359         return pktmp;
 360         }
 361
 362 int i2d_PUBKEY(EVP_PKEY *a, unsigned char **pp)
 363         {
 364         X509_PUBKEY *xpk=NULL;
 365         int ret;
 366         if(!a) return 0;
 367         if(!X509_PUBKEY_set(&xpk, a)) return 0;
 368         ret = i2d_X509_PUBKEY(xpk, pp);
 369         X509_PUBKEY_free(xpk);
 370         return ret;
 371         }
 372
 373 /* The following are equivalents but which return RSA and DSA
 374  * keys
 375  */
 376 #ifndef OPENSSL_NO_RSA
 377 RSA *d2i_RSA_PUBKEY(RSA **a, unsigned char **pp,
 378              long length)
 379         {
 380         EVP_PKEY *pkey;
 381         RSA *key;
 382         unsigned char *q;
 383         q = *pp;
 384         pkey = d2i_PUBKEY(NULL, &q, length);
 385         if (!pkey) return NULL;
 386         key = EVP_PKEY_get1_RSA(pkey);
 387         EVP_PKEY_free(pkey);
 388         if (!key) return NULL;
 389         *pp = q;
 390         if (a)
 391                 {
 392                 RSA_free(*a);
 393                 *a = key;
 394                 }
 395         return key;
 396         }
 397
 398 int i2d_RSA_PUBKEY(RSA *a, unsigned char **pp)
 399         {
 400         EVP_PKEY *pktmp;
 401         int ret;
 402         if (!a) return 0;
 403         pktmp = EVP_PKEY_new();
 404         if (!pktmp)
 405                 {
 406                 ASN1err(ASN1_F_I2D_RSA_PUBKEY, ERR_R_MALLOC_FAILURE);
 407                 return 0;
 408                 }
 409         EVP_PKEY_set1_RSA(pktmp, a);
 410         ret = i2d_PUBKEY(pktmp, pp);
 411         EVP_PKEY_free(pktmp);
 412         return ret;
 413         }
 414 #endif
 415
 416 #ifndef OPENSSL_NO_DSA
 417 DSA *d2i_DSA_PUBKEY(DSA **a, unsigned char **pp,
 418              long length)
 419         {
 420         EVP_PKEY *pkey;
 421         DSA *key;
 422         unsigned char *q;
 423         q = *pp;
 424         pkey = d2i_PUBKEY(NULL, &q, length);
 425         if (!pkey) return NULL;
 426         key = EVP_PKEY_get1_DSA(pkey);
 427         EVP_PKEY_free(pkey);
 428         if (!key) return NULL;
 429         *pp = q;
 430         if (a)
 431                 {
 432                 DSA_free(*a);
 433                 *a = key;
 434                 }
 435         return key;
 436         }
 437
 438 int i2d_DSA_PUBKEY(DSA *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_DSA_PUBKEY, ERR_R_MALLOC_FAILURE);
 447                 return 0;
 448                 }
 449         EVP_PKEY_set1_DSA(pktmp, a);
 450         ret = i2d_PUBKEY(pktmp, pp);
 451         EVP_PKEY_free(pktmp);
 452         return ret;
 453         }
 454 #endif
 455
 456 #ifndef OPENSSL_NO_ECDSA
 457 ECDSA *d2i_ECDSA_PUBKEY(ECDSA **a, unsigned char **pp, long length)
 458         {
 459         EVP_PKEY *pkey;
 460         ECDSA *key;
 461         unsigned char *q;
 462         q = *pp;
 463         pkey = d2i_PUBKEY(NULL, &q, length);
 464         if (!pkey) return(NULL);
 465         key = EVP_PKEY_get1_ECDSA(pkey);
 466         EVP_PKEY_free(pkey);
 467         if (!key)  return(NULL);
 468         *pp = q;
 469         if (a)
 470                 {
 471                 ECDSA_free(*a);
 472                 *a = key;
 473                 }
 474         return(key);
 475         }
 476
 477 int i2d_ECDSA_PUBKEY(ECDSA *a, unsigned char **pp)
 478         {
 479         EVP_PKEY *pktmp;
 480         int ret;
 481         if (!a) return(0);
 482         if ((pktmp = EVP_PKEY_new()) == NULL)
 483                 {
 484                 ASN1err(ASN1_F_I2D_ECDSA_PUBKEY, ERR_R_MALLOC_FAILURE);
 485                 return(0);
 486                 }
 487         EVP_PKEY_set1_ECDSA(pktmp, a);
 488         ret = i2d_PUBKEY(pktmp, pp);
 489         EVP_PKEY_free(pktmp);
 490         return(ret);
 491         }
 492 #endif