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 "asn1_locl.h"
  64 #ifndef OPENSSL_NO_RSA
  65 #include <openssl/rsa.h>
  66 #endif
  67 #ifndef OPENSSL_NO_DSA
  68 #include <openssl/dsa.h>
  69 #endif
  70 
  71 /* Minor tweak to operation: free up EVP_PKEY */
  72 static int pubkey_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
  73                         void *exarg)
  74         {
  75         if (operation == ASN1_OP_FREE_POST)
  76                 {
  77                 X509_PUBKEY *pubkey = (X509_PUBKEY *)*pval;
  78                 EVP_PKEY_free(pubkey->pkey);
  79                 }
  80         return 1;
  81         }
  82 
  83 ASN1_SEQUENCE_cb(X509_PUBKEY, pubkey_cb) = {
  84         ASN1_SIMPLE(X509_PUBKEY, algor, X509_ALGOR),
  85         ASN1_SIMPLE(X509_PUBKEY, public_key, ASN1_BIT_STRING)
  86 } ASN1_SEQUENCE_END_cb(X509_PUBKEY, X509_PUBKEY)
  87 
  88 IMPLEMENT_ASN1_FUNCTIONS(X509_PUBKEY)
  89 
  90 int X509_PUBKEY_set(X509_PUBKEY **x, EVP_PKEY *pkey)
  91         {
  92         X509_PUBKEY *pk=NULL;
  93 
  94         if (x == NULL) return(0);
  95 
  96         if ((pk=X509_PUBKEY_new()) == NULL) goto error;
  97 
  98         if (pkey->ameth)
  99                 {
 100                 if (pkey->ameth->pub_encode)
 101                         {
 102                         if (!pkey->ameth->pub_encode(pk, pkey))
 103                                 {
 104                                 X509err(X509_F_X509_PUBKEY_SET,
 105                                         X509_R_PUBLIC_KEY_ENCODE_ERROR);
 106                                 goto error;
 107                                 }
 108                         }
 109                 else
 110                         {
 111                         X509err(X509_F_X509_PUBKEY_SET,
 112                                 X509_R_METHOD_NOT_SUPPORTED);
 113                         goto error;
 114                         }
 115                 }
 116         else
 117                 {
 118                 X509err(X509_F_X509_PUBKEY_SET,X509_R_UNSUPPORTED_ALGORITHM);
 119                 goto error;
 120                 }
 121 
 122         if (*x != NULL)
 123                 X509_PUBKEY_free(*x);
 124 
 125         *x=pk;
 126 
 127         return 1;
 128 error:
 129         if (pk != NULL) X509_PUBKEY_free(pk);
 130         return 0;
 131         }
 132 
 133 EVP_PKEY *X509_PUBKEY_get(X509_PUBKEY *key)
 134         {
 135         EVP_PKEY *ret=NULL;
 136 
 137         if (key == NULL) goto error;
 138 
 139         if (key->pkey != NULL)
 140                 {
 141                 CRYPTO_add(&key->pkey->references, 1, CRYPTO_LOCK_EVP_PKEY);
 142                 return key->pkey;
 143                 }
 144 
 145         if (key->public_key == NULL) goto error;
 146 
 147         if ((ret = EVP_PKEY_new()) == NULL)
 148                 {
 149                 X509err(X509_F_X509_PUBKEY_GET, ERR_R_MALLOC_FAILURE);
 150                 goto error;
 151                 }
 152 
 153         if (!EVP_PKEY_set_type(ret, OBJ_obj2nid(key->algor->algorithm)))
 154                 {
 155                 X509err(X509_F_X509_PUBKEY_GET,X509_R_UNSUPPORTED_ALGORITHM);
 156                 goto error;
 157                 }
 158 
 159         if (ret->ameth->pub_decode)
 160                 {
 161                 if (!ret->ameth->pub_decode(ret, key))
 162                         {
 163                         X509err(X509_F_X509_PUBKEY_GET,
 164                                                 X509_R_PUBLIC_KEY_DECODE_ERROR);
 165                         goto error;
 166                         }
 167                 }
 168         else
 169                 {
 170                 X509err(X509_F_X509_PUBKEY_GET, X509_R_METHOD_NOT_SUPPORTED);
 171                 goto error;
 172                 }
 173 
 174         /* Check to see if another thread set key->pkey first */
 175         CRYPTO_w_lock(CRYPTO_LOCK_EVP_PKEY);
 176         if (key->pkey)
 177                 {
 178                 CRYPTO_w_unlock(CRYPTO_LOCK_EVP_PKEY);
 179                 EVP_PKEY_free(ret);
 180                 ret = key->pkey;
 181                 }
 182         else
 183                 {
 184                 key->pkey = ret;
 185                 CRYPTO_w_unlock(CRYPTO_LOCK_EVP_PKEY);
 186                 }
 187         CRYPTO_add(&ret->references, 1, CRYPTO_LOCK_EVP_PKEY);
 188 
 189         return ret;
 190 
 191         error:
 192         if (ret != NULL)
 193                 EVP_PKEY_free(ret);
 194         return(NULL);
 195         }
 196 
 197 /* Now two pseudo ASN1 routines that take an EVP_PKEY structure
 198  * and encode or decode as X509_PUBKEY
 199  */
 200 
 201 EVP_PKEY *d2i_PUBKEY(EVP_PKEY **a, const unsigned char **pp,
 202              long length)
 203         {
 204         X509_PUBKEY *xpk;
 205         EVP_PKEY *pktmp;
 206         xpk = d2i_X509_PUBKEY(NULL, pp, length);
 207         if(!xpk) return NULL;
 208         pktmp = X509_PUBKEY_get(xpk);
 209         X509_PUBKEY_free(xpk);
 210         if(!pktmp) return NULL;
 211         if(a)
 212                 {
 213                 EVP_PKEY_free(*a);
 214                 *a = pktmp;
 215                 }
 216         return pktmp;
 217         }
 218 
 219 int i2d_PUBKEY(EVP_PKEY *a, unsigned char **pp)
 220         {
 221         X509_PUBKEY *xpk=NULL;
 222         int ret;
 223         if(!a) return 0;
 224         if(!X509_PUBKEY_set(&xpk, a)) return 0;
 225         ret = i2d_X509_PUBKEY(xpk, pp);
 226         X509_PUBKEY_free(xpk);
 227         return ret;
 228         }
 229 
 230 /* The following are equivalents but which return RSA and DSA
 231  * keys
 232  */
 233 #ifndef OPENSSL_NO_RSA
 234 RSA *d2i_RSA_PUBKEY(RSA **a, const unsigned char **pp,
 235              long length)
 236         {
 237         EVP_PKEY *pkey;
 238         RSA *key;
 239         const unsigned char *q;
 240         q = *pp;
 241         pkey = d2i_PUBKEY(NULL, &q, length);
 242         if (!pkey) return NULL;
 243         key = EVP_PKEY_get1_RSA(pkey);
 244         EVP_PKEY_free(pkey);
 245         if (!key) return NULL;
 246         *pp = q;
 247         if (a)
 248                 {
 249                 RSA_free(*a);
 250                 *a = key;
 251                 }
 252         return key;
 253         }
 254 
 255 int i2d_RSA_PUBKEY(RSA *a, unsigned char **pp)
 256         {
 257         EVP_PKEY *pktmp;
 258         int ret;
 259         if (!a) return 0;
 260         pktmp = EVP_PKEY_new();
 261         if (!pktmp)
 262                 {
 263                 ASN1err(ASN1_F_I2D_RSA_PUBKEY, ERR_R_MALLOC_FAILURE);
 264                 return 0;
 265                 }
 266         EVP_PKEY_set1_RSA(pktmp, a);
 267         ret = i2d_PUBKEY(pktmp, pp);
 268         EVP_PKEY_free(pktmp);
 269         return ret;
 270         }
 271 #endif
 272 
 273 #ifndef OPENSSL_NO_DSA
 274 DSA *d2i_DSA_PUBKEY(DSA **a, const unsigned char **pp,
 275              long length)
 276         {
 277         EVP_PKEY *pkey;
 278         DSA *key;
 279         const unsigned char *q;
 280         q = *pp;
 281         pkey = d2i_PUBKEY(NULL, &q, length);
 282         if (!pkey) return NULL;
 283         key = EVP_PKEY_get1_DSA(pkey);
 284         EVP_PKEY_free(pkey);
 285         if (!key) return NULL;
 286         *pp = q;
 287         if (a)
 288                 {
 289                 DSA_free(*a);
 290                 *a = key;
 291                 }
 292         return key;
 293         }
 294 
 295 int i2d_DSA_PUBKEY(DSA *a, unsigned char **pp)
 296         {
 297         EVP_PKEY *pktmp;
 298         int ret;
 299         if(!a) return 0;
 300         pktmp = EVP_PKEY_new();
 301         if(!pktmp)
 302                 {
 303                 ASN1err(ASN1_F_I2D_DSA_PUBKEY, ERR_R_MALLOC_FAILURE);
 304                 return 0;
 305                 }
 306         EVP_PKEY_set1_DSA(pktmp, a);
 307         ret = i2d_PUBKEY(pktmp, pp);
 308         EVP_PKEY_free(pktmp);
 309         return ret;
 310         }
 311 #endif
 312 
 313 #ifndef OPENSSL_NO_EC
 314 EC_KEY *d2i_EC_PUBKEY(EC_KEY **a, const unsigned char **pp, long length)
 315         {
 316         EVP_PKEY *pkey;
 317         EC_KEY *key;
 318         const unsigned char *q;
 319         q = *pp;
 320         pkey = d2i_PUBKEY(NULL, &q, length);
 321         if (!pkey) return(NULL);
 322         key = EVP_PKEY_get1_EC_KEY(pkey);
 323         EVP_PKEY_free(pkey);
 324         if (!key)  return(NULL);
 325         *pp = q;
 326         if (a)
 327                 {
 328                 EC_KEY_free(*a);
 329                 *a = key;
 330                 }
 331         return(key);
 332         }
 333 
 334 int i2d_EC_PUBKEY(EC_KEY *a, unsigned char **pp)
 335         {
 336         EVP_PKEY *pktmp;
 337         int ret;
 338         if (!a) return(0);
 339         if ((pktmp = EVP_PKEY_new()) == NULL)
 340                 {
 341                 ASN1err(ASN1_F_I2D_EC_PUBKEY, ERR_R_MALLOC_FAILURE);
 342                 return(0);
 343                 }
 344         EVP_PKEY_set1_EC_KEY(pktmp, a);
 345         ret = i2d_PUBKEY(pktmp, pp);
 346         EVP_PKEY_free(pktmp);
 347         return(ret);
 348         }
 349 #endif
 350 
 351 int X509_PUBKEY_set0_param(X509_PUBKEY *pub, ASN1_OBJECT *aobj,
 352                                         int ptype, void *pval,
 353                                         unsigned char *penc, int penclen)
 354         {
 355         if (!X509_ALGOR_set0(pub->algor, aobj, ptype, pval))
 356                 return 0;
 357         if (penc)
 358                 {
 359                 if (pub->public_key->data)
 360                         OPENSSL_free(pub->public_key->data);
 361                 pub->public_key->data = penc;
 362                 pub->public_key->length = penclen;
 363                 /* Set number of unused bits to zero */
 364                 pub->public_key->flags&= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07);
 365                 pub->public_key->flags|=ASN1_STRING_FLAG_BITS_LEFT;
 366                 }
 367         return 1;
 368         }
 369 
 370 int X509_PUBKEY_get0_param(ASN1_OBJECT **ppkalg,
 371                 const unsigned char **pk, int *ppklen,
 372                 X509_ALGOR **pa,
 373                 X509_PUBKEY *pub)
 374         {
 375         if (ppkalg)
 376                 *ppkalg = pub->algor->algorithm;
 377         if (pk)
 378                 {
 379                 *pk = pub->public_key->data;
 380                 *ppklen = pub->public_key->length;
 381                 }
 382         if (pa)
 383                 *pa = pub->algor;
 384         return 1;
 385         }