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