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 #ifndef OPENSSL_NO_RSA
  64 # include <openssl/rsa.h>
  65 #endif
  66 #ifndef OPENSSL_NO_DSA
  67 # include <openssl/dsa.h>
  68 #endif
  69
  70 /* Minor tweak to operation: free up EVP_PKEY */
  71 static int pubkey_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it)
  72 {
  73     if (operation == ASN1_OP_FREE_POST) {
  74         X509_PUBKEY *pubkey = (X509_PUBKEY *)*pval;
  75         EVP_PKEY_free(pubkey->pkey);
  76     }
  77     return 1;
  78 }
  79
  80 ASN1_SEQUENCE_cb(X509_PUBKEY, pubkey_cb) = {
  81         ASN1_SIMPLE(X509_PUBKEY, algor, X509_ALGOR),
  82         ASN1_SIMPLE(X509_PUBKEY, public_key, ASN1_BIT_STRING)
  83 } ASN1_SEQUENCE_END_cb(X509_PUBKEY, X509_PUBKEY)
  84
  85 IMPLEMENT_ASN1_FUNCTIONS(X509_PUBKEY)
  86
  87 int X509_PUBKEY_set(X509_PUBKEY **x, EVP_PKEY *pkey)
  88 {
  89     X509_PUBKEY *pk = NULL;
  90     X509_ALGOR *a;
  91     ASN1_OBJECT *o;
  92     unsigned char *s, *p = NULL;
  93     int i;
  94
  95     if (x == NULL)
  96         return (0);
  97
  98     if ((pk = X509_PUBKEY_new()) == NULL)
  99         goto err;
 100     a = pk->algor;
 101
 102     /* set the algorithm id */
 103     if ((o = OBJ_nid2obj(pkey->type)) == NULL)
 104         goto err;
 105     ASN1_OBJECT_free(a->algorithm);
 106     a->algorithm = o;
 107
 108     /* Set the parameter list */
 109     if (!pkey->save_parameters || (pkey->type == EVP_PKEY_RSA)) {
 110         if ((a->parameter == NULL) || (a->parameter->type != V_ASN1_NULL)) {
 111             ASN1_TYPE_free(a->parameter);
 112             if (!(a->parameter = ASN1_TYPE_new())) {
 113                 X509err(X509_F_X509_PUBKEY_SET, ERR_R_MALLOC_FAILURE);
 114                 goto err;
 115             }
 116             a->parameter->type = V_ASN1_NULL;
 117         }
 118     }
 119 #ifndef OPENSSL_NO_DSA
 120     else if (pkey->type == EVP_PKEY_DSA) {
 121         unsigned char *pp;
 122         DSA *dsa;
 123
 124         dsa = pkey->pkey.dsa;
 125         dsa->write_params = 0;
 126         ASN1_TYPE_free(a->parameter);
 127         if ((i = i2d_DSAparams(dsa, NULL)) <= 0)
 128             goto err;
 129         if (!(p = (unsigned char *)OPENSSL_malloc(i))) {
 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             OPENSSL_free(p);
 137             X509err(X509_F_X509_PUBKEY_SET, ERR_R_MALLOC_FAILURE);
 138             goto err;
 139         }
 140         a->parameter->type = V_ASN1_SEQUENCE;
 141         if (!(a->parameter->value.sequence = ASN1_STRING_new())) {
 142             OPENSSL_free(p);
 143             X509err(X509_F_X509_PUBKEY_SET, ERR_R_MALLOC_FAILURE);
 144             goto err;
 145         }
 146         if (!ASN1_STRING_set(a->parameter->value.sequence, p, i)) {
 147             OPENSSL_free(p);
 148             X509err(X509_F_X509_PUBKEY_SET, ERR_R_MALLOC_FAILURE);
 149             goto err;
 150         }
 151         OPENSSL_free(p);
 152     }
 153 #endif
 154 #ifndef OPENSSL_NO_EC
 155     else if (pkey->type == EVP_PKEY_EC) {
 156         int nid = 0;
 157         unsigned char *pp;
 158         EC_KEY *ec_key;
 159         const EC_GROUP *group;
 160
 161         ec_key = pkey->pkey.ec;
 162         ASN1_TYPE_free(a->parameter);
 163
 164         if ((a->parameter = ASN1_TYPE_new()) == NULL) {
 165             X509err(X509_F_X509_PUBKEY_SET, ERR_R_ASN1_LIB);
 166             goto err;
 167         }
 168
 169         group = EC_KEY_get0_group(ec_key);
 170         if (EC_GROUP_get_asn1_flag(group)
 171             && (nid = EC_GROUP_get_curve_name(group))) {
 172             /* just set the OID */
 173             a->parameter->type = V_ASN1_OBJECT;
 174             a->parameter->value.object = OBJ_nid2obj(nid);
 175         } else {                /* explicit parameters */
 176
 177             if ((i = i2d_ECParameters(ec_key, NULL)) == 0) {
 178                 X509err(X509_F_X509_PUBKEY_SET, ERR_R_EC_LIB);
 179                 goto err;
 180             }
 181             if ((p = (unsigned char *)OPENSSL_malloc(i)) == NULL) {
 182                 X509err(X509_F_X509_PUBKEY_SET, ERR_R_MALLOC_FAILURE);
 183                 goto err;
 184             }
 185             pp = p;
 186             if (!i2d_ECParameters(ec_key, &pp)) {
 187                 X509err(X509_F_X509_PUBKEY_SET, ERR_R_EC_LIB);
 188                 OPENSSL_free(p);
 189                 goto err;
 190             }
 191             a->parameter->type = V_ASN1_SEQUENCE;
 192             if ((a->parameter->value.sequence = ASN1_STRING_new()) == NULL) {
 193                 X509err(X509_F_X509_PUBKEY_SET, ERR_R_ASN1_LIB);
 194                 OPENSSL_free(p);
 195                 goto err;
 196             }
 197             ASN1_STRING_set(a->parameter->value.sequence, p, i);
 198             OPENSSL_free(p);
 199         }
 200     }
 201 #endif
 202     else if (1) {
 203         X509err(X509_F_X509_PUBKEY_SET, X509_R_UNSUPPORTED_ALGORITHM);
 204         goto err;
 205     }
 206
 207     if ((i = i2d_PublicKey(pkey, NULL)) <= 0)
 208         goto err;
 209     if ((s = (unsigned char *)OPENSSL_malloc(i + 1)) == NULL) {
 210         X509err(X509_F_X509_PUBKEY_SET, ERR_R_MALLOC_FAILURE);
 211         goto err;
 212     }
 213     p = s;
 214     i2d_PublicKey(pkey, &p);
 215     if (!M_ASN1_BIT_STRING_set(pk->public_key, s, i)) {
 216         X509err(X509_F_X509_PUBKEY_SET, ERR_R_MALLOC_FAILURE);
 217         goto err;
 218     }
 219     /* Set number of unused bits to zero */
 220     pk->public_key->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
 221     pk->public_key->flags |= ASN1_STRING_FLAG_BITS_LEFT;
 222
 223     OPENSSL_free(s);
 224
 225 #if 0
 226     CRYPTO_add(&pkey->references, 1, CRYPTO_LOCK_EVP_PKEY);
 227     pk->pkey = pkey;
 228 #endif
 229
 230     if (*x != NULL)
 231         X509_PUBKEY_free(*x);
 232
 233     *x = pk;
 234
 235     return 1;
 236  err:
 237     if (pk != NULL)
 238         X509_PUBKEY_free(pk);
 239     return 0;
 240 }
 241
 242 EVP_PKEY *X509_PUBKEY_get(X509_PUBKEY *key)
 243 {
 244     EVP_PKEY *ret = NULL;
 245     long j;
 246     int type;
 247     const unsigned char *p;
 248 #if !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_ECDSA)
 249     const unsigned char *cp;
 250     X509_ALGOR *a;
 251 #endif
 252
 253     if (key == NULL)
 254         goto err;
 255
 256     if (key->pkey != NULL) {
 257         CRYPTO_add(&key->pkey->references, 1, CRYPTO_LOCK_EVP_PKEY);
 258         return (key->pkey);
 259     }
 260
 261     if (key->public_key == NULL)
 262         goto err;
 263
 264     type = OBJ_obj2nid(key->algor->algorithm);
 265     if ((ret = EVP_PKEY_new()) == NULL) {
 266         X509err(X509_F_X509_PUBKEY_GET, ERR_R_MALLOC_FAILURE);
 267         goto err;
 268     }
 269     ret->type = EVP_PKEY_type(type);
 270
 271     /* the parameters must be extracted before the public key (ECDSA!) */
 272
 273 #if !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_ECDSA)
 274     a = key->algor;
 275 #endif
 276
 277     if (0) ;
 278 #ifndef OPENSSL_NO_DSA
 279     else if (ret->type == EVP_PKEY_DSA) {
 280         if (a->parameter && (a->parameter->type == V_ASN1_SEQUENCE)) {
 281             if ((ret->pkey.dsa = DSA_new()) == NULL) {
 282                 X509err(X509_F_X509_PUBKEY_GET, ERR_R_MALLOC_FAILURE);
 283                 goto err;
 284             }
 285             ret->pkey.dsa->write_params = 0;
 286             cp = p = a->parameter->value.sequence->data;
 287             j = a->parameter->value.sequence->length;
 288             if (!d2i_DSAparams(&ret->pkey.dsa, &cp, (long)j))
 289                 goto err;
 290         }
 291         ret->save_parameters = 1;
 292     }
 293 #endif
 294 #ifndef OPENSSL_NO_EC
 295     else if (ret->type == EVP_PKEY_EC) {
 296         if (a->parameter && (a->parameter->type == V_ASN1_SEQUENCE)) {
 297             /*
 298              * type == V_ASN1_SEQUENCE => we have explicit parameters (e.g.
 299              * parameters in the X9_62_EC_PARAMETERS-structure )
 300              */
 301             if ((ret->pkey.ec = EC_KEY_new()) == NULL) {
 302                 X509err(X509_F_X509_PUBKEY_GET, ERR_R_MALLOC_FAILURE);
 303                 goto err;
 304             }
 305             cp = p = a->parameter->value.sequence->data;
 306             j = a->parameter->value.sequence->length;
 307             if (!d2i_ECParameters(&ret->pkey.ec, &cp, (long)j)) {
 308                 X509err(X509_F_X509_PUBKEY_GET, ERR_R_EC_LIB);
 309                 goto err;
 310             }
 311         } else if (a->parameter && (a->parameter->type == V_ASN1_OBJECT)) {
 312             /*
 313              * type == V_ASN1_OBJECT => the parameters are given by an asn1
 314              * OID
 315              */
 316             EC_KEY *ec_key;
 317             EC_GROUP *group;
 318
 319             if (ret->pkey.ec == NULL)
 320                 ret->pkey.ec = EC_KEY_new();
 321             ec_key = ret->pkey.ec;
 322             if (ec_key == NULL)
 323                 goto err;
 324             group =
 325                 EC_GROUP_new_by_curve_name(OBJ_obj2nid
 326                                            (a->parameter->value.object));
 327             if (group == NULL)
 328                 goto err;
 329             EC_GROUP_set_asn1_flag(group, OPENSSL_EC_NAMED_CURVE);
 330             if (EC_KEY_set_group(ec_key, group) == 0)
 331                 goto err;
 332             EC_GROUP_free(group);
 333         }
 334         /*
 335          * the case implicitlyCA is currently not implemented
 336          */
 337         ret->save_parameters = 1;
 338     }
 339 #endif
 340
 341     p = key->public_key->data;
 342     j = key->public_key->length;
 343     if (!d2i_PublicKey(type, &ret, &p, (long)j)) {
 344         X509err(X509_F_X509_PUBKEY_GET, X509_R_ERR_ASN1_LIB);
 345         goto err;
 346     }
 347
 348     /* Check to see if another thread set key->pkey first */
 349     CRYPTO_w_lock(CRYPTO_LOCK_EVP_PKEY);
 350     if (key->pkey) {
 351         CRYPTO_w_unlock(CRYPTO_LOCK_EVP_PKEY);
 352         EVP_PKEY_free(ret);
 353         ret = key->pkey;
 354     } else {
 355         key->pkey = ret;
 356         CRYPTO_w_unlock(CRYPTO_LOCK_EVP_PKEY);
 357     }
 358     CRYPTO_add(&ret->references, 1, CRYPTO_LOCK_EVP_PKEY);
 359     return (ret);
 360  err:
 361     if (ret != NULL)
 362         EVP_PKEY_free(ret);
 363     return (NULL);
 364 }
 365
 366 /*
 367  * Now two pseudo ASN1 routines that take an EVP_PKEY structure and encode or
 368  * decode as X509_PUBKEY
 369  */
 370
 371 EVP_PKEY *d2i_PUBKEY(EVP_PKEY **a, const unsigned char **pp, long length)
 372 {
 373     X509_PUBKEY *xpk;
 374     EVP_PKEY *pktmp;
 375     xpk = d2i_X509_PUBKEY(NULL, pp, length);
 376     if (!xpk)
 377         return NULL;
 378     pktmp = X509_PUBKEY_get(xpk);
 379     X509_PUBKEY_free(xpk);
 380     if (!pktmp)
 381         return NULL;
 382     if (a) {
 383         EVP_PKEY_free(*a);
 384         *a = pktmp;
 385     }
 386     return pktmp;
 387 }
 388
 389 int i2d_PUBKEY(EVP_PKEY *a, unsigned char **pp)
 390 {
 391     X509_PUBKEY *xpk = NULL;
 392     int ret;
 393     if (!a)
 394         return 0;
 395     if (!X509_PUBKEY_set(&xpk, a))
 396         return 0;
 397     ret = i2d_X509_PUBKEY(xpk, pp);
 398     X509_PUBKEY_free(xpk);
 399     return ret;
 400 }
 401
 402 /*
 403  * The following are equivalents but which return RSA and DSA keys
 404  */
 405 #ifndef OPENSSL_NO_RSA
 406 RSA *d2i_RSA_PUBKEY(RSA **a, const unsigned char **pp, long length)
 407 {
 408     EVP_PKEY *pkey;
 409     RSA *key;
 410     const unsigned char *q;
 411     q = *pp;
 412     pkey = d2i_PUBKEY(NULL, &q, length);
 413     if (!pkey)
 414         return NULL;
 415     key = EVP_PKEY_get1_RSA(pkey);
 416     EVP_PKEY_free(pkey);
 417     if (!key)
 418         return NULL;
 419     *pp = q;
 420     if (a) {
 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)
 432         return 0;
 433     pktmp = EVP_PKEY_new();
 434     if (!pktmp) {
 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, long length)
 447 {
 448     EVP_PKEY *pkey;
 449     DSA *key;
 450     const unsigned char *q;
 451     q = *pp;
 452     pkey = d2i_PUBKEY(NULL, &q, length);
 453     if (!pkey)
 454         return NULL;
 455     key = EVP_PKEY_get1_DSA(pkey);
 456     EVP_PKEY_free(pkey);
 457     if (!key)
 458         return NULL;
 459     *pp = q;
 460     if (a) {
 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)
 472         return 0;
 473     pktmp = EVP_PKEY_new();
 474     if (!pktmp) {
 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)
 494         return (NULL);
 495     key = EVP_PKEY_get1_EC_KEY(pkey);
 496     EVP_PKEY_free(pkey);
 497     if (!key)
 498         return (NULL);
 499     *pp = q;
 500     if (a) {
 501         EC_KEY_free(*a);
 502         *a = key;
 503     }
 504     return (key);
 505 }
 506
 507 int i2d_EC_PUBKEY(EC_KEY *a, unsigned char **pp)
 508 {
 509     EVP_PKEY *pktmp;
 510     int ret;
 511     if (!a)
 512         return (0);
 513     if ((pktmp = EVP_PKEY_new()) == NULL) {
 514         ASN1err(ASN1_F_I2D_EC_PUBKEY, ERR_R_MALLOC_FAILURE);
 515         return (0);
 516     }
 517     EVP_PKEY_set1_EC_KEY(pktmp, a);
 518     ret = i2d_PUBKEY(pktmp, pp);
 519     EVP_PKEY_free(pktmp);
 520     return (ret);
 521 }
 522 #endif