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                 X509_PUBKEY *pubkey = (X509_PUBKEY *)*pval;
  69                 EVP_PKEY_free(pubkey->pkey);
  70         }
  71         return 1;
  72 }
  73
  74 ASN1_SEQUENCE_cb(X509_PUBKEY, pubkey_cb) = {
  75         ASN1_SIMPLE(X509_PUBKEY, algor, X509_ALGOR),
  76         ASN1_SIMPLE(X509_PUBKEY, public_key, ASN1_BIT_STRING)
  77 } ASN1_SEQUENCE_END_cb(X509_PUBKEY, X509_PUBKEY)
  78
  79 IMPLEMENT_ASN1_FUNCTIONS(X509_PUBKEY)
  80
  81 int X509_PUBKEY_set(X509_PUBKEY **x, EVP_PKEY *pkey)
  82         {
  83         X509_PUBKEY *pk=NULL;
  84         X509_ALGOR *a;
  85         ASN1_OBJECT *o;
  86         unsigned char *s,*p = NULL;
  87         int i;
  88
  89         if (x == NULL) return(0);
  90
  91         if ((pk=X509_PUBKEY_new()) == NULL) goto err;
  92         a=pk->algor;
  93
  94         /* set the algorithm id */
  95         if ((o=OBJ_nid2obj(pkey->type)) == NULL) goto err;
  96         ASN1_OBJECT_free(a->algorithm);
  97         a->algorithm=o;
  98
  99         /* Set the parameter list */
 100         if (!pkey->save_parameters || (pkey->type == EVP_PKEY_RSA))
 101                 {
 102                 if ((a->parameter == NULL) ||
 103                         (a->parameter->type != V_ASN1_NULL))
 104                         {
 105                         ASN1_TYPE_free(a->parameter);
 106                         if (!(a->parameter=ASN1_TYPE_new()))
 107                                 {
 108                                 X509err(X509_F_X509_PUBKEY_SET,ERR_R_MALLOC_FAILURE);
 109                                 goto err;
 110                                 }
 111                         a->parameter->type=V_ASN1_NULL;
 112                         }
 113                 }
 114         else
 115 #ifndef OPENSSL_NO_DSA
 116                 if (pkey->type == EVP_PKEY_DSA)
 117                 {
 118                 unsigned char *pp;
 119                 DSA *dsa;
 120
 121                 dsa=pkey->pkey.dsa;
 122                 dsa->write_params=0;
 123                 ASN1_TYPE_free(a->parameter);
 124                 if ((i=i2d_DSAparams(dsa,NULL)) <= 0)
 125                         goto err;
 126                 if (!(p=(unsigned char *)OPENSSL_malloc(i)))
 127                         {
 128                         X509err(X509_F_X509_PUBKEY_SET,ERR_R_MALLOC_FAILURE);
 129                         goto err;
 130                         }
 131                 pp=p;
 132                 i2d_DSAparams(dsa,&pp);
 133                 if (!(a->parameter=ASN1_TYPE_new()))
 134                         {
 135                         OPENSSL_free(p);
 136                         X509err(X509_F_X509_PUBKEY_SET,ERR_R_MALLOC_FAILURE);
 137                         goto err;
 138                         }
 139                 a->parameter->type=V_ASN1_SEQUENCE;
 140                 if (!(a->parameter->value.sequence=ASN1_STRING_new()))
 141                         {
 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                         {
 148                         OPENSSL_free(p);
 149                         X509err(X509_F_X509_PUBKEY_SET,ERR_R_MALLOC_FAILURE);
 150                         goto err;
 151                         }
 152                 OPENSSL_free(p);
 153                 }
 154         else
 155 #endif
 156                 {
 157                 X509err(X509_F_X509_PUBKEY_SET,X509_R_UNSUPPORTED_ALGORITHM);
 158                 goto err;
 159                 }
 160
 161         if ((i=i2d_PublicKey(pkey,NULL)) <= 0) goto err;
 162         if ((s=(unsigned char *)OPENSSL_malloc(i+1)) == NULL)
 163                 {
 164                 X509err(X509_F_X509_PUBKEY_SET,ERR_R_MALLOC_FAILURE);
 165                 goto err;
 166                 }
 167         p=s;
 168         i2d_PublicKey(pkey,&p);
 169         if (!M_ASN1_BIT_STRING_set(pk->public_key,s,i))
 170                 {
 171                 X509err(X509_F_X509_PUBKEY_SET,ERR_R_MALLOC_FAILURE);
 172                 goto err;
 173                 }
 174         /* Set number of unused bits to zero */
 175         /* Set number of unused bits to zero */
 176         pk->public_key->flags&= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07);
 177         pk->public_key->flags|=ASN1_STRING_FLAG_BITS_LEFT;
 178
 179         OPENSSL_free(s);
 180
 181 #if 0
 182         CRYPTO_add(&pkey->references,1,CRYPTO_LOCK_EVP_PKEY);
 183         pk->pkey=pkey;
 184 #endif
 185
 186         if (*x != NULL)
 187                 X509_PUBKEY_free(*x);
 188
 189         *x=pk;
 190
 191         return 1;
 192 err:
 193         if (pk != NULL) X509_PUBKEY_free(pk);
 194         return 0;
 195         }
 196
 197 EVP_PKEY *X509_PUBKEY_get(X509_PUBKEY *key)
 198         {
 199         EVP_PKEY *ret=NULL;
 200         long j;
 201         int type;
 202         unsigned char *p;
 203 #ifndef OPENSSL_NO_DSA
 204         const unsigned char *cp;
 205         X509_ALGOR *a;
 206 #endif
 207
 208         if (key == NULL) goto err;
 209
 210         if (key->pkey != NULL)
 211             {
 212             CRYPTO_add(&key->pkey->references,1,CRYPTO_LOCK_EVP_PKEY);
 213             return(key->pkey);
 214             }
 215
 216         if (key->public_key == NULL) goto err;
 217
 218         type=OBJ_obj2nid(key->algor->algorithm);
 219         p=key->public_key->data;
 220         j=key->public_key->length;
 221         if ((ret=d2i_PublicKey(type,NULL,&p,(long)j)) == NULL)
 222                 {
 223                 X509err(X509_F_X509_PUBKEY_GET,X509_R_ERR_ASN1_LIB);
 224                 goto err;
 225                 }
 226         ret->save_parameters=0;
 227
 228 #ifndef OPENSSL_NO_DSA
 229         a=key->algor;
 230         if (ret->type == EVP_PKEY_DSA)
 231                 {
 232                 if (a->parameter && (a->parameter->type == V_ASN1_SEQUENCE))
 233                         {
 234                         ret->pkey.dsa->write_params=0;
 235                         cp=p=a->parameter->value.sequence->data;
 236                         j=a->parameter->value.sequence->length;
 237                         if (!d2i_DSAparams(&ret->pkey.dsa,&cp,(long)j))
 238                                 goto err;
 239                         }
 240                 ret->save_parameters=1;
 241                 }
 242 #endif
 243         key->pkey=ret;
 244         CRYPTO_add(&ret->references,1,CRYPTO_LOCK_EVP_PKEY);
 245         return(ret);
 246 err:
 247         if (ret != NULL)
 248                 EVP_PKEY_free(ret);
 249         return(NULL);
 250         }
 251
 252 /* Now two pseudo ASN1 routines that take an EVP_PKEY structure
 253  * and encode or decode as X509_PUBKEY
 254  */
 255
 256 EVP_PKEY *d2i_PUBKEY(EVP_PKEY **a, unsigned char **pp,
 257              long length)
 258 {
 259         X509_PUBKEY *xpk;
 260         EVP_PKEY *pktmp;
 261         xpk = d2i_X509_PUBKEY(NULL, pp, length);
 262         if(!xpk) return NULL;
 263         pktmp = X509_PUBKEY_get(xpk);
 264         X509_PUBKEY_free(xpk);
 265         if(!pktmp) return NULL;
 266         if(a) {
 267                 EVP_PKEY_free(*a);
 268                 *a = pktmp;
 269         }
 270         return pktmp;
 271 }
 272
 273 int i2d_PUBKEY(EVP_PKEY *a, unsigned char **pp)
 274 {
 275         X509_PUBKEY *xpk=NULL;
 276         int ret;
 277         if(!a) return 0;
 278         if(!X509_PUBKEY_set(&xpk, a)) return 0;
 279         ret = i2d_X509_PUBKEY(xpk, pp);
 280         X509_PUBKEY_free(xpk);
 281         return ret;
 282 }
 283
 284 /* The following are equivalents but which return RSA and DSA
 285  * keys
 286  */
 287 #ifndef OPENSSL_NO_RSA
 288 RSA *d2i_RSA_PUBKEY(RSA **a, unsigned char **pp,
 289              long length)
 290 {
 291         EVP_PKEY *pkey;
 292         RSA *key;
 293         unsigned char *q;
 294         q = *pp;
 295         pkey = d2i_PUBKEY(NULL, &q, length);
 296         if(!pkey) return NULL;
 297         key = EVP_PKEY_get1_RSA(pkey);
 298         EVP_PKEY_free(pkey);
 299         if(!key) return NULL;
 300         *pp = q;
 301         if(a) {
 302                 RSA_free(*a);
 303                 *a = key;
 304         }
 305         return key;
 306 }
 307
 308 int i2d_RSA_PUBKEY(RSA *a, unsigned char **pp)
 309 {
 310         EVP_PKEY *pktmp;
 311         int ret;
 312         if(!a) return 0;
 313         pktmp = EVP_PKEY_new();
 314         if(!pktmp) {
 315                 ASN1err(ASN1_F_I2D_RSA_PUBKEY, ERR_R_MALLOC_FAILURE);
 316                 return 0;
 317         }
 318         EVP_PKEY_set1_RSA(pktmp, a);
 319         ret = i2d_PUBKEY(pktmp, pp);
 320         EVP_PKEY_free(pktmp);
 321         return ret;
 322 }
 323 #endif
 324
 325 #ifndef OPENSSL_NO_DSA
 326 DSA *d2i_DSA_PUBKEY(DSA **a, unsigned char **pp,
 327              long length)
 328 {
 329         EVP_PKEY *pkey;
 330         DSA *key;
 331         unsigned char *q;
 332         q = *pp;
 333         pkey = d2i_PUBKEY(NULL, &q, length);
 334         if(!pkey) return NULL;
 335         key = EVP_PKEY_get1_DSA(pkey);
 336         EVP_PKEY_free(pkey);
 337         if(!key) return NULL;
 338         *pp = q;
 339         if(a) {
 340                 DSA_free(*a);
 341                 *a = key;
 342         }
 343         return key;
 344 }
 345
 346 int i2d_DSA_PUBKEY(DSA *a, unsigned char **pp)
 347 {
 348         EVP_PKEY *pktmp;
 349         int ret;
 350         if(!a) return 0;
 351         pktmp = EVP_PKEY_new();
 352         if(!pktmp) {
 353                 ASN1err(ASN1_F_I2D_DSA_PUBKEY, ERR_R_MALLOC_FAILURE);
 354                 return 0;
 355         }
 356         EVP_PKEY_set1_DSA(pktmp, a);
 357         ret = i2d_PUBKEY(pktmp, pp);
 358         EVP_PKEY_free(pktmp);
 359         return ret;
 360 }
 361 #endif