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