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 ((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)
 193                 {
 194                 X509err(X509_F_X509_PUBKEY_SET,ERR_R_MALLOC_FAILURE);
 195                 goto err;
 196                 }
 197         p=s;
 198         i2d_PublicKey(pkey,&p);
 199         if (!M_ASN1_BIT_STRING_set(pk->public_key,s,i)) goto err;
 200         /* Set number of unused bits to zero */
 201         pk->public_key->flags&= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07);
 202         pk->public_key->flags|=ASN1_STRING_FLAG_BITS_LEFT;
 203
 204         OPENSSL_free(s);
 205
 206 #if 0
 207         CRYPTO_add(&pkey->references,1,CRYPTO_LOCK_EVP_PKEY);
 208         pk->pkey=pkey;
 209 #endif
 210
 211         if (*x != NULL)
 212                 X509_PUBKEY_free(*x);
 213
 214         *x=pk;
 215         pk=NULL;
 216
 217         ok=1;
 218 err:
 219         if (pk != NULL) X509_PUBKEY_free(pk);
 220         return(ok);
 221         }
 222
 223 EVP_PKEY *X509_PUBKEY_get(X509_PUBKEY *key)
 224         {
 225         EVP_PKEY *ret=NULL;
 226         long j;
 227         int type;
 228         unsigned char *p;
 229 #if !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_ECDSA)
 230         const unsigned char *cp;
 231         X509_ALGOR *a;
 232 #endif
 233
 234         if (key == NULL) goto err;
 235
 236         if (key->pkey != NULL)
 237                 {
 238                 CRYPTO_add(&key->pkey->references, 1, CRYPTO_LOCK_EVP_PKEY);
 239                 return(key->pkey);
 240                 }
 241
 242         if (key->public_key == NULL) goto err;
 243
 244         type=OBJ_obj2nid(key->algor->algorithm);
 245         if ((ret = EVP_PKEY_new()) == NULL)
 246                 {
 247                 X509err(X509_F_X509_PUBKEY_GET, ERR_R_MALLOC_FAILURE);
 248                 goto err;
 249                 }
 250         ret->type = EVP_PKEY_type(type);
 251
 252         /* the parameters must be extracted before the public key (ECDSA!) */
 253
 254 #if !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_ECDSA)
 255         a=key->algor;
 256 #endif
 257
 258         if (0)
 259                 ;
 260 #ifndef OPENSSL_NO_DSA
 261         else if (ret->type == EVP_PKEY_DSA)
 262                 {
 263                 if (a->parameter && (a->parameter->type == V_ASN1_SEQUENCE))
 264                         {
 265                         if ((ret->pkey.dsa = DSA_new()) == NULL)
 266                                 {
 267                                 X509err(X509_F_X509_PUBKEY_GET, ERR_R_MALLOC_FAILURE);
 268                                 goto err;
 269                                 }
 270                         ret->pkey.dsa->write_params=0;
 271                         cp=p=a->parameter->value.sequence->data;
 272                         j=a->parameter->value.sequence->length;
 273                         if (!d2i_DSAparams(&ret->pkey.dsa, &cp, (long)j))
 274                                 goto err;
 275                         }
 276                 ret->save_parameters=1;
 277                 }
 278 #endif
 279 #ifndef OPENSSL_NO_ECDSA
 280         else if (ret->type == EVP_PKEY_ECDSA)
 281                 {
 282                 if (a->parameter && (a->parameter->type == V_ASN1_SEQUENCE))
 283                         {
 284                         /* type == V_ASN1_SEQUENCE => we have explicit parameters
 285                          * (e.g. parameters in the X9_62_EC_PARAMETERS-structure )
 286                          */
 287                         if ((ret->pkey.ecdsa= ECDSA_new()) == NULL)
 288                                 {
 289                                 X509err(X509_F_X509_PUBKEY_GET, ERR_R_MALLOC_FAILURE);
 290                                 goto err;
 291                                 }
 292                         cp = p = a->parameter->value.sequence->data;
 293                         j = a->parameter->value.sequence->length;
 294                         if (!d2i_ECDSAParameters(&ret->pkey.ecdsa, &cp, (long)j))
 295                                 {
 296                                 X509err(X509_F_X509_PUBKEY_GET, ERR_R_ECDSA_LIB);
 297                                 goto err;
 298                                 }
 299                         }
 300                 else if (a->parameter && (a->parameter->type == V_ASN1_OBJECT))
 301                         {
 302                         /* type == V_ASN1_OBJECT => the parameters are given
 303                          * by an asn1 OID
 304                          */
 305                         if (ret->pkey.ecdsa == NULL)
 306                                 ret->pkey.ecdsa = ECDSA_new();
 307                         if (ret->pkey.ecdsa->group)
 308                                 EC_GROUP_free(ret->pkey.ecdsa->group);
 309                         ret->pkey.ecdsa->parameter_flags |= ECDSA_FLAG_NAMED_CURVE;
 310                         if ((ret->pkey.ecdsa->group = EC_GROUP_new_by_name(OBJ_obj2nid(a->parameter->value.object))) == NULL)
 311                                 goto err;
 312                         }
 313                         /* the case implicitlyCA is currently not implemented */
 314                 ret->save_parameters = 1;
 315                 }
 316 #endif
 317
 318         p=key->public_key->data;
 319         j=key->public_key->length;
 320         if ((ret = d2i_PublicKey(type, &ret, &p, (long)j)) == NULL)
 321                 {
 322                 X509err(X509_F_X509_PUBKEY_GET, X509_R_ERR_ASN1_LIB);
 323                 goto err;
 324                 }
 325
 326         key->pkey = ret;
 327         CRYPTO_add(&ret->references, 1, CRYPTO_LOCK_EVP_PKEY);
 328         return(ret);
 329 err:
 330         if (ret != NULL)
 331                 EVP_PKEY_free(ret);
 332         return(NULL);
 333         }
 334
 335 /* Now two pseudo ASN1 routines that take an EVP_PKEY structure
 336  * and encode or decode as X509_PUBKEY
 337  */
 338
 339 EVP_PKEY *d2i_PUBKEY(EVP_PKEY **a, unsigned char **pp,
 340              long length)
 341         {
 342         X509_PUBKEY *xpk;
 343         EVP_PKEY *pktmp;
 344         xpk = d2i_X509_PUBKEY(NULL, pp, length);
 345         if(!xpk) return NULL;
 346         pktmp = X509_PUBKEY_get(xpk);
 347         X509_PUBKEY_free(xpk);
 348         if(!pktmp) return NULL;
 349         if(a)
 350                 {
 351                 EVP_PKEY_free(*a);
 352                 *a = pktmp;
 353                 }
 354         return pktmp;
 355         }
 356
 357 int i2d_PUBKEY(EVP_PKEY *a, unsigned char **pp)
 358         {
 359         X509_PUBKEY *xpk=NULL;
 360         int ret;
 361         if(!a) return 0;
 362         if(!X509_PUBKEY_set(&xpk, a)) return 0;
 363         ret = i2d_X509_PUBKEY(xpk, pp);
 364         X509_PUBKEY_free(xpk);
 365         return ret;
 366         }
 367
 368 /* The following are equivalents but which return RSA and DSA
 369  * keys
 370  */
 371 #ifndef OPENSSL_NO_RSA
 372 RSA *d2i_RSA_PUBKEY(RSA **a, unsigned char **pp,
 373              long length)
 374         {
 375         EVP_PKEY *pkey;
 376         RSA *key;
 377         unsigned char *q;
 378         q = *pp;
 379         pkey = d2i_PUBKEY(NULL, &q, length);
 380         if (!pkey) return NULL;
 381         key = EVP_PKEY_get1_RSA(pkey);
 382         EVP_PKEY_free(pkey);
 383         if (!key) return NULL;
 384         *pp = q;
 385         if (a)
 386                 {
 387                 RSA_free(*a);
 388                 *a = key;
 389                 }
 390         return key;
 391         }
 392
 393 int i2d_RSA_PUBKEY(RSA *a, unsigned char **pp)
 394         {
 395         EVP_PKEY *pktmp;
 396         int ret;
 397         if (!a) return 0;
 398         pktmp = EVP_PKEY_new();
 399         if (!pktmp)
 400                 {
 401                 ASN1err(ASN1_F_I2D_RSA_PUBKEY, ERR_R_MALLOC_FAILURE);
 402                 return 0;
 403                 }
 404         EVP_PKEY_set1_RSA(pktmp, a);
 405         ret = i2d_PUBKEY(pktmp, pp);
 406         EVP_PKEY_free(pktmp);
 407         return ret;
 408         }
 409 #endif
 410
 411 #ifndef OPENSSL_NO_DSA
 412 DSA *d2i_DSA_PUBKEY(DSA **a, unsigned char **pp,
 413              long length)
 414         {
 415         EVP_PKEY *pkey;
 416         DSA *key;
 417         unsigned char *q;
 418         q = *pp;
 419         pkey = d2i_PUBKEY(NULL, &q, length);
 420         if (!pkey) return NULL;
 421         key = EVP_PKEY_get1_DSA(pkey);
 422         EVP_PKEY_free(pkey);
 423         if (!key) return NULL;
 424         *pp = q;
 425         if (a)
 426                 {
 427                 DSA_free(*a);
 428                 *a = key;
 429                 }
 430         return key;
 431         }
 432
 433 int i2d_DSA_PUBKEY(DSA *a, unsigned char **pp)
 434         {
 435         EVP_PKEY *pktmp;
 436         int ret;
 437         if(!a) return 0;
 438         pktmp = EVP_PKEY_new();
 439         if(!pktmp)
 440                 {
 441                 ASN1err(ASN1_F_I2D_DSA_PUBKEY, ERR_R_MALLOC_FAILURE);
 442                 return 0;
 443                 }
 444         EVP_PKEY_set1_DSA(pktmp, a);
 445         ret = i2d_PUBKEY(pktmp, pp);
 446         EVP_PKEY_free(pktmp);
 447         return ret;
 448         }
 449 #endif
 450
 451 #ifndef OPENSSL_NO_ECDSA
 452 ECDSA *d2i_ECDSA_PUBKEY(ECDSA **a, unsigned char **pp, long length)
 453         {
 454         EVP_PKEY *pkey;
 455         ECDSA *key;
 456         unsigned char *q;
 457         q = *pp;
 458         pkey = d2i_PUBKEY(NULL, &q, length);
 459         if (!pkey) return(NULL);
 460         key = EVP_PKEY_get1_ECDSA(pkey);
 461         EVP_PKEY_free(pkey);
 462         if (!key)  return(NULL);
 463         *pp = q;
 464         if (a)
 465                 {
 466                 ECDSA_free(*a);
 467                 *a = key;
 468                 }
 469         return(key);
 470         }
 471
 472 int i2d_ECDSA_PUBKEY(ECDSA *a, unsigned char **pp)
 473         {
 474         EVP_PKEY *pktmp;
 475         int ret;
 476         if (!a) return(0);
 477         if ((pktmp = EVP_PKEY_new()) == NULL)
 478                 {
 479                 ASN1err(ASN1_F_I2D_ECDSA_PUBKEY, ERR_R_MALLOC_FAILURE);
 480                 return(0);
 481                 }
 482         EVP_PKEY_set1_ECDSA(pktmp, a);
 483         ret = i2d_PUBKEY(pktmp, pp);
 484         EVP_PKEY_free(pktmp);
 485         return(ret);
 486         }
 487 #endif