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