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 "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         const EVP_PKEY_ASN1_METHOD *meth;
  94
  95         if (x == NULL) return(0);
  96
  97         if ((pk=X509_PUBKEY_new()) == NULL) goto error;
  98
  99         meth = EVP_PKEY_asn1_find(pkey->type);
 100
 101         if (meth)
 102                 {
 103                 if (meth->pub_encode)
 104                         {
 105                         if (!meth->pub_encode(pk, pkey))
 106                                 {
 107                                 X509err(X509_F_X509_PUBKEY_SET,
 108                                         X509_R_PUBLIC_KEY_ENCODE_ERROR);
 109                                 goto error;
 110                                 }
 111                         }
 112                 else
 113                         {
 114                         X509err(X509_F_X509_PUBKEY_SET,
 115                                 X509_R_METHOD_NOT_SUPPORTED);
 116                         goto error;
 117                         }
 118                 }
 119         else
 120                 {
 121                 X509err(X509_F_X509_PUBKEY_SET,X509_R_UNSUPPORTED_ALGORITHM);
 122                 goto error;
 123                 }
 124
 125         if (*x != NULL)
 126                 X509_PUBKEY_free(*x);
 127
 128         *x=pk;
 129
 130         return 1;
 131 error:
 132         if (pk != NULL) X509_PUBKEY_free(pk);
 133         return 0;
 134         }
 135
 136 EVP_PKEY *X509_PUBKEY_get(X509_PUBKEY *key)
 137         {
 138         EVP_PKEY *ret=NULL;
 139         const EVP_PKEY_ASN1_METHOD *meth;
 140
 141         if (key == NULL) goto error;
 142
 143         if (key->pkey != NULL)
 144                 {
 145                 CRYPTO_add(&key->pkey->references, 1, CRYPTO_LOCK_EVP_PKEY);
 146                 return key->pkey;
 147                 }
 148
 149         if (key->public_key == NULL) goto error;
 150
 151         if ((ret = EVP_PKEY_new()) == NULL)
 152                 {
 153                 X509err(X509_F_X509_PUBKEY_GET, ERR_R_MALLOC_FAILURE);
 154                 goto error;
 155                 }
 156
 157         meth = EVP_PKEY_asn1_find(OBJ_obj2nid(key->algor->algorithm));
 158
 159         if (meth)
 160                 {
 161                 if (meth->pub_decode)
 162                         {
 163                         if (!meth->pub_decode(ret, key))
 164                                 {
 165                                 X509err(X509_F_X509_PUBKEY_GET,
 166                                                 X509_R_PUBLIC_KEY_DECODE_ERROR);
 167                                 goto error;
 168                                 }
 169                         }
 170                 else
 171                         {
 172                         X509err(X509_F_X509_PUBKEY_GET,
 173                                 X509_R_METHOD_NOT_SUPPORTED);
 174                         goto error;
 175                         }
 176                 }
 177         else
 178                 {
 179                 X509err(X509_F_X509_PUBKEY_GET,X509_R_UNSUPPORTED_ALGORITHM);
 180                 goto error;
 181                 }
 182
 183         key->pkey = ret;
 184         CRYPTO_add(&ret->references, 1, CRYPTO_LOCK_EVP_PKEY);
 185
 186         return ret;
 187
 188         error:
 189         if (ret != NULL)
 190                 EVP_PKEY_free(ret);
 191         return(NULL);
 192         }
 193
 194 /* Now two pseudo ASN1 routines that take an EVP_PKEY structure
 195  * and encode or decode as X509_PUBKEY
 196  */
 197
 198 EVP_PKEY *d2i_PUBKEY(EVP_PKEY **a, const unsigned char **pp,
 199              long length)
 200         {
 201         X509_PUBKEY *xpk;
 202         EVP_PKEY *pktmp;
 203         xpk = d2i_X509_PUBKEY(NULL, pp, length);
 204         if(!xpk) return NULL;
 205         pktmp = X509_PUBKEY_get(xpk);
 206         X509_PUBKEY_free(xpk);
 207         if(!pktmp) return NULL;
 208         if(a)
 209                 {
 210                 EVP_PKEY_free(*a);
 211                 *a = pktmp;
 212                 }
 213         return pktmp;
 214         }
 215
 216 int i2d_PUBKEY(EVP_PKEY *a, unsigned char **pp)
 217         {
 218         X509_PUBKEY *xpk=NULL;
 219         int ret;
 220         if(!a) return 0;
 221         if(!X509_PUBKEY_set(&xpk, a)) return 0;
 222         ret = i2d_X509_PUBKEY(xpk, pp);
 223         X509_PUBKEY_free(xpk);
 224         return ret;
 225         }
 226
 227 /* The following are equivalents but which return RSA and DSA
 228  * keys
 229  */
 230 #ifndef OPENSSL_NO_RSA
 231 RSA *d2i_RSA_PUBKEY(RSA **a, const unsigned char **pp,
 232              long length)
 233         {
 234         EVP_PKEY *pkey;
 235         RSA *key;
 236         const unsigned char *q;
 237         q = *pp;
 238         pkey = d2i_PUBKEY(NULL, &q, length);
 239         if (!pkey) return NULL;
 240         key = EVP_PKEY_get1_RSA(pkey);
 241         EVP_PKEY_free(pkey);
 242         if (!key) return NULL;
 243         *pp = q;
 244         if (a)
 245                 {
 246                 RSA_free(*a);
 247                 *a = key;
 248                 }
 249         return key;
 250         }
 251
 252 int i2d_RSA_PUBKEY(RSA *a, unsigned char **pp)
 253         {
 254         EVP_PKEY *pktmp;
 255         int ret;
 256         if (!a) return 0;
 257         pktmp = EVP_PKEY_new();
 258         if (!pktmp)
 259                 {
 260                 ASN1err(ASN1_F_I2D_RSA_PUBKEY, ERR_R_MALLOC_FAILURE);
 261                 return 0;
 262                 }
 263         EVP_PKEY_set1_RSA(pktmp, a);
 264         ret = i2d_PUBKEY(pktmp, pp);
 265         EVP_PKEY_free(pktmp);
 266         return ret;
 267         }
 268 #endif
 269
 270 #ifndef OPENSSL_NO_DSA
 271 DSA *d2i_DSA_PUBKEY(DSA **a, const unsigned char **pp,
 272              long length)
 273         {
 274         EVP_PKEY *pkey;
 275         DSA *key;
 276         const unsigned char *q;
 277         q = *pp;
 278         pkey = d2i_PUBKEY(NULL, &q, length);
 279         if (!pkey) return NULL;
 280         key = EVP_PKEY_get1_DSA(pkey);
 281         EVP_PKEY_free(pkey);
 282         if (!key) return NULL;
 283         *pp = q;
 284         if (a)
 285                 {
 286                 DSA_free(*a);
 287                 *a = key;
 288                 }
 289         return key;
 290         }
 291
 292 int i2d_DSA_PUBKEY(DSA *a, unsigned char **pp)
 293         {
 294         EVP_PKEY *pktmp;
 295         int ret;
 296         if(!a) return 0;
 297         pktmp = EVP_PKEY_new();
 298         if(!pktmp)
 299                 {
 300                 ASN1err(ASN1_F_I2D_DSA_PUBKEY, ERR_R_MALLOC_FAILURE);
 301                 return 0;
 302                 }
 303         EVP_PKEY_set1_DSA(pktmp, a);
 304         ret = i2d_PUBKEY(pktmp, pp);
 305         EVP_PKEY_free(pktmp);
 306         return ret;
 307         }
 308 #endif
 309
 310 #ifndef OPENSSL_NO_EC
 311 EC_KEY *d2i_EC_PUBKEY(EC_KEY **a, const unsigned char **pp, long length)
 312         {
 313         EVP_PKEY *pkey;
 314         EC_KEY *key;
 315         const unsigned char *q;
 316         q = *pp;
 317         pkey = d2i_PUBKEY(NULL, &q, length);
 318         if (!pkey) return(NULL);
 319         key = EVP_PKEY_get1_EC_KEY(pkey);
 320         EVP_PKEY_free(pkey);
 321         if (!key)  return(NULL);
 322         *pp = q;
 323         if (a)
 324                 {
 325                 EC_KEY_free(*a);
 326                 *a = key;
 327                 }
 328         return(key);
 329         }
 330
 331 int i2d_EC_PUBKEY(EC_KEY *a, unsigned char **pp)
 332         {
 333         EVP_PKEY *pktmp;
 334         int ret;
 335         if (!a) return(0);
 336         if ((pktmp = EVP_PKEY_new()) == NULL)
 337                 {
 338                 ASN1err(ASN1_F_I2D_EC_PUBKEY, ERR_R_MALLOC_FAILURE);
 339                 return(0);
 340                 }
 341         EVP_PKEY_set1_EC_KEY(pktmp, a);
 342         ret = i2d_PUBKEY(pktmp, pp);
 343         EVP_PKEY_free(pktmp);
 344         return(ret);
 345         }
 346 #endif
 347
 348 int X509_PUBKEY_set0_param(X509_PUBKEY *pub, ASN1_OBJECT *aobj,
 349                                         int ptype, void *pval,
 350                                         unsigned char *penc, int penclen)
 351         {
 352         if (!X509_ALGOR_set0(pub->algor, aobj, ptype, pval))
 353                 return 0;
 354         if (penc)
 355                 {
 356                 if (pub->public_key->data)
 357                         OPENSSL_free(pub->public_key->data);
 358                 pub->public_key->data = penc;
 359                 pub->public_key->length = penclen;
 360                 /* Set number of unused bits to zero */
 361                 pub->public_key->flags&= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07);
 362                 pub->public_key->flags|=ASN1_STRING_FLAG_BITS_LEFT;
 363                 }
 364         return 1;
 365         }
 366
 367 int X509_PUBKEY_get0_param(ASN1_OBJECT **ppkalg,
 368                 const unsigned char **pk, int *ppklen,
 369                 X509_ALGOR **pa,
 370                 X509_PUBKEY *pub)
 371         {
 372         if (ppkalg)
 373                 *ppkalg = pub->algor->algorithm;
 374         if (pk)
 375                 {
 376                 *pk = pub->public_key->data;
 377                 *ppklen = pub->public_key->length;
 378                 }
 379         if (pa)
 380                 *pa = pub->algor;
 381         return 1;
 382         }