lib/libcrypto/asn1/x_pubkey.c

   1 /* $OpenBSD: x_pubkey.c,v 1.26 2017/01/29 17:49:22 beck Exp $ */
   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
  61 #include <openssl/opensslconf.h>
  62
  63 #include <openssl/asn1t.h>
  64 #include <openssl/err.h>
  65 #include <openssl/x509.h>
  66
  67 #ifndef OPENSSL_NO_DSA
  68 #include <openssl/dsa.h>
  69 #endif
  70 #ifndef OPENSSL_NO_RSA
  71 #include <openssl/rsa.h>
  72 #endif
  73
  74 #include "asn1_locl.h"
  75
  76 /* Minor tweak to operation: free up EVP_PKEY */
  77 static int
  78 pubkey_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it, void *exarg)
  79 {
  80         if (operation == ASN1_OP_FREE_POST) {
  81                 X509_PUBKEY *pubkey = (X509_PUBKEY *)*pval;
  82                 EVP_PKEY_free(pubkey->pkey);
  83         }
  84         return 1;
  85 }
  86
  87 static const ASN1_AUX X509_PUBKEY_aux = {
  88         .asn1_cb = pubkey_cb,
  89 };
  90 static const ASN1_TEMPLATE X509_PUBKEY_seq_tt[] = {
  91         {
  92                 .offset = offsetof(X509_PUBKEY, algor),
  93                 .field_name = "algor",
  94                 .item = &X509_ALGOR_it,
  95         },
  96         {
  97                 .offset = offsetof(X509_PUBKEY, public_key),
  98                 .field_name = "public_key",
  99                 .item = &ASN1_BIT_STRING_it,
 100         },
 101 };
 102
 103 const ASN1_ITEM X509_PUBKEY_it = {
 104         .itype = ASN1_ITYPE_SEQUENCE,
 105         .utype = V_ASN1_SEQUENCE,
 106         .templates = X509_PUBKEY_seq_tt,
 107         .tcount = sizeof(X509_PUBKEY_seq_tt) / sizeof(ASN1_TEMPLATE),
 108         .funcs = &X509_PUBKEY_aux,
 109         .size = sizeof(X509_PUBKEY),
 110         .sname = "X509_PUBKEY",
 111 };
 112
 113
 114 X509_PUBKEY *
 115 d2i_X509_PUBKEY(X509_PUBKEY **a, const unsigned char **in, long len)
 116 {
 117         return (X509_PUBKEY *)ASN1_item_d2i((ASN1_VALUE **)a, in, len,
 118             &X509_PUBKEY_it);
 119 }
 120
 121 int
 122 i2d_X509_PUBKEY(X509_PUBKEY *a, unsigned char **out)
 123 {
 124         return ASN1_item_i2d((ASN1_VALUE *)a, out, &X509_PUBKEY_it);
 125 }
 126
 127 X509_PUBKEY *
 128 X509_PUBKEY_new(void)
 129 {
 130         return (X509_PUBKEY *)ASN1_item_new(&X509_PUBKEY_it);
 131 }
 132
 133 void
 134 X509_PUBKEY_free(X509_PUBKEY *a)
 135 {
 136         ASN1_item_free((ASN1_VALUE *)a, &X509_PUBKEY_it);
 137 }
 138
 139 int
 140 X509_PUBKEY_set(X509_PUBKEY **x, EVP_PKEY *pkey)
 141 {
 142         X509_PUBKEY *pk = NULL;
 143
 144         if (x == NULL)
 145                 return (0);
 146         if ((pk = X509_PUBKEY_new()) == NULL)
 147                 goto error;
 148
 149         if (pkey->ameth) {
 150                 if (pkey->ameth->pub_encode) {
 151                         if (!pkey->ameth->pub_encode(pk, pkey)) {
 152                                 X509error(X509_R_PUBLIC_KEY_ENCODE_ERROR);
 153                                 goto error;
 154                         }
 155                 } else {
 156                         X509error(X509_R_METHOD_NOT_SUPPORTED);
 157                         goto error;
 158                 }
 159         } else {
 160                 X509error(X509_R_UNSUPPORTED_ALGORITHM);
 161                 goto error;
 162         }
 163
 164         if (*x != NULL)
 165                 X509_PUBKEY_free(*x);
 166
 167         *x = pk;
 168
 169         return 1;
 170
 171 error:
 172         if (pk != NULL)
 173                 X509_PUBKEY_free(pk);
 174         return 0;
 175 }
 176
 177 EVP_PKEY *
 178 X509_PUBKEY_get(X509_PUBKEY *key)
 179 {
 180         EVP_PKEY *ret = NULL;
 181
 182         if (key == NULL)
 183                 goto error;
 184
 185         if (key->pkey != NULL) {
 186                 CRYPTO_add(&key->pkey->references, 1, CRYPTO_LOCK_EVP_PKEY);
 187                 return key->pkey;
 188         }
 189
 190         if (key->public_key == NULL)
 191                 goto error;
 192
 193         if ((ret = EVP_PKEY_new()) == NULL) {
 194                 X509error(ERR_R_MALLOC_FAILURE);
 195                 goto error;
 196         }
 197
 198         if (!EVP_PKEY_set_type(ret, OBJ_obj2nid(key->algor->algorithm))) {
 199                 X509error(X509_R_UNSUPPORTED_ALGORITHM);
 200                 goto error;
 201         }
 202
 203         if (ret->ameth->pub_decode) {
 204                 if (!ret->ameth->pub_decode(ret, key)) {
 205                         X509error(X509_R_PUBLIC_KEY_DECODE_ERROR);
 206                         goto error;
 207                 }
 208         } else {
 209                 X509error(X509_R_METHOD_NOT_SUPPORTED);
 210                 goto error;
 211         }
 212
 213         /* Check to see if another thread set key->pkey first */
 214         CRYPTO_w_lock(CRYPTO_LOCK_EVP_PKEY);
 215         if (key->pkey) {
 216                 CRYPTO_w_unlock(CRYPTO_LOCK_EVP_PKEY);
 217                 EVP_PKEY_free(ret);
 218                 ret = key->pkey;
 219         } else {
 220                 key->pkey = ret;
 221                 CRYPTO_w_unlock(CRYPTO_LOCK_EVP_PKEY);
 222         }
 223         CRYPTO_add(&ret->references, 1, CRYPTO_LOCK_EVP_PKEY);
 224
 225         return ret;
 226
 227 error:
 228         EVP_PKEY_free(ret);
 229         return (NULL);
 230 }
 231
 232 /* Now two pseudo ASN1 routines that take an EVP_PKEY structure
 233  * and encode or decode as X509_PUBKEY
 234  */
 235
 236 EVP_PKEY *
 237 d2i_PUBKEY(EVP_PKEY **a, const unsigned char **pp, long length)
 238 {
 239         X509_PUBKEY *xpk;
 240         EVP_PKEY *pktmp;
 241         xpk = d2i_X509_PUBKEY(NULL, pp, length);
 242         if (!xpk)
 243                 return NULL;
 244         pktmp = X509_PUBKEY_get(xpk);
 245         X509_PUBKEY_free(xpk);
 246         if (!pktmp)
 247                 return NULL;
 248         if (a) {
 249                 EVP_PKEY_free(*a);
 250                 *a = pktmp;
 251         }
 252         return pktmp;
 253 }
 254
 255 int
 256 i2d_PUBKEY(EVP_PKEY *a, unsigned char **pp)
 257 {
 258         X509_PUBKEY *xpk = NULL;
 259         int ret;
 260         if (!a)
 261                 return 0;
 262         if (!X509_PUBKEY_set(&xpk, a))
 263                 return 0;
 264         ret = i2d_X509_PUBKEY(xpk, pp);
 265         X509_PUBKEY_free(xpk);
 266         return ret;
 267 }
 268
 269 /* The following are equivalents but which return RSA and DSA
 270  * keys
 271  */
 272 #ifndef OPENSSL_NO_RSA
 273 RSA *
 274 d2i_RSA_PUBKEY(RSA **a, const unsigned char **pp, long length)
 275 {
 276         EVP_PKEY *pkey;
 277         RSA *key;
 278         const unsigned char *q;
 279         q = *pp;
 280         pkey = d2i_PUBKEY(NULL, &q, length);
 281         if (!pkey)
 282                 return NULL;
 283         key = EVP_PKEY_get1_RSA(pkey);
 284         EVP_PKEY_free(pkey);
 285         if (!key)
 286                 return NULL;
 287         *pp = q;
 288         if (a) {
 289                 RSA_free(*a);
 290                 *a = key;
 291         }
 292         return key;
 293 }
 294
 295 int
 296 i2d_RSA_PUBKEY(RSA *a, unsigned char **pp)
 297 {
 298         EVP_PKEY *pktmp;
 299         int ret;
 300         if (!a)
 301                 return 0;
 302         pktmp = EVP_PKEY_new();
 303         if (!pktmp) {
 304                 ASN1error(ERR_R_MALLOC_FAILURE);
 305                 return 0;
 306         }
 307         EVP_PKEY_set1_RSA(pktmp, a);
 308         ret = i2d_PUBKEY(pktmp, pp);
 309         EVP_PKEY_free(pktmp);
 310         return ret;
 311 }
 312 #endif
 313
 314 #ifndef OPENSSL_NO_DSA
 315 DSA *
 316 d2i_DSA_PUBKEY(DSA **a, const unsigned char **pp, long length)
 317 {
 318         EVP_PKEY *pkey;
 319         DSA *key;
 320         const unsigned char *q;
 321         q = *pp;
 322         pkey = d2i_PUBKEY(NULL, &q, length);
 323         if (!pkey)
 324                 return NULL;
 325         key = EVP_PKEY_get1_DSA(pkey);
 326         EVP_PKEY_free(pkey);
 327         if (!key)
 328                 return NULL;
 329         *pp = q;
 330         if (a) {
 331                 DSA_free(*a);
 332                 *a = key;
 333         }
 334         return key;
 335 }
 336
 337 int
 338 i2d_DSA_PUBKEY(DSA *a, unsigned char **pp)
 339 {
 340         EVP_PKEY *pktmp;
 341         int ret;
 342         if (!a)
 343                 return 0;
 344         pktmp = EVP_PKEY_new();
 345         if (!pktmp) {
 346                 ASN1error(ERR_R_MALLOC_FAILURE);
 347                 return 0;
 348         }
 349         EVP_PKEY_set1_DSA(pktmp, a);
 350         ret = i2d_PUBKEY(pktmp, pp);
 351         EVP_PKEY_free(pktmp);
 352         return ret;
 353 }
 354 #endif
 355
 356 #ifndef OPENSSL_NO_EC
 357 EC_KEY *
 358 d2i_EC_PUBKEY(EC_KEY **a, const unsigned char **pp, long length)
 359 {
 360         EVP_PKEY *pkey;
 361         EC_KEY *key;
 362         const unsigned char *q;
 363         q = *pp;
 364         pkey = d2i_PUBKEY(NULL, &q, length);
 365         if (!pkey)
 366                 return (NULL);
 367         key = EVP_PKEY_get1_EC_KEY(pkey);
 368         EVP_PKEY_free(pkey);
 369         if (!key)
 370                 return (NULL);
 371         *pp = q;
 372         if (a) {
 373                 EC_KEY_free(*a);
 374                 *a = key;
 375         }
 376         return (key);
 377 }
 378
 379 int
 380 i2d_EC_PUBKEY(EC_KEY *a, unsigned char **pp)
 381 {
 382         EVP_PKEY *pktmp;
 383         int ret;
 384         if (!a)
 385                 return (0);
 386         if ((pktmp = EVP_PKEY_new()) == NULL) {
 387                 ASN1error(ERR_R_MALLOC_FAILURE);
 388                 return (0);
 389         }
 390         EVP_PKEY_set1_EC_KEY(pktmp, a);
 391         ret = i2d_PUBKEY(pktmp, pp);
 392         EVP_PKEY_free(pktmp);
 393         return (ret);
 394 }
 395 #endif
 396
 397 int
 398 X509_PUBKEY_set0_param(X509_PUBKEY *pub, ASN1_OBJECT *aobj, int ptype,
 399     void *pval, unsigned char *penc, int penclen)
 400 {
 401         if (!X509_ALGOR_set0(pub->algor, aobj, ptype, pval))
 402                 return 0;
 403         if (penc) {
 404                 free(pub->public_key->data);
 405                 pub->public_key->data = penc;
 406                 pub->public_key->length = penclen;
 407                 /* Set number of unused bits to zero */
 408                 pub->public_key->flags&= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07);
 409                 pub->public_key->flags |= ASN1_STRING_FLAG_BITS_LEFT;
 410         }
 411         return 1;
 412 }
 413
 414 int
 415 X509_PUBKEY_get0_param(ASN1_OBJECT **ppkalg, const unsigned char **pk,
 416     int *ppklen, X509_ALGOR **pa, X509_PUBKEY *pub)
 417 {
 418         if (ppkalg)
 419                 *ppkalg = pub->algor->algorithm;
 420         if (pk) {
 421                 *pk = pub->public_key->data;
 422                 *ppklen = pub->public_key->length;
 423         }
 424         if (pa)
 425                 *pa = pub->algor;
 426         return 1;
 427 }