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         int ok=0;
  84         X509_PUBKEY *pk;
  85         X509_ALGOR *a;
  86         ASN1_OBJECT *o;
  87         unsigned char *s,*p;
  88         int i;
  89
  90         if (x == NULL) return(0);
  91
  92         if ((pk=X509_PUBKEY_new()) == NULL) goto err;
  93         a=pk->algor;
  94
  95         /* set the algorithm id */
  96         if ((o=OBJ_nid2obj(pkey->type)) == NULL) goto err;
  97         ASN1_OBJECT_free(a->algorithm);
  98         a->algorithm=o;
  99
 100         /* Set the parameter list */
 101         if (!pkey->save_parameters || (pkey->type == EVP_PKEY_RSA))
 102                 {
 103                 if ((a->parameter == NULL) ||
 104                         (a->parameter->type != V_ASN1_NULL))
 105                         {
 106                         ASN1_TYPE_free(a->parameter);
 107                         a->parameter=ASN1_TYPE_new();
 108                         a->parameter->type=V_ASN1_NULL;
 109                         }
 110                 }
 111         else
 112 #ifndef NO_DSA
 113                 if (pkey->type == EVP_PKEY_DSA)
 114                 {
 115                 unsigned char *pp;
 116                 DSA *dsa;
 117
 118                 dsa=pkey->pkey.dsa;
 119                 dsa->write_params=0;
 120                 ASN1_TYPE_free(a->parameter);
 121                 i=i2d_DSAparams(dsa,NULL);
 122                 p=(unsigned char *)OPENSSL_malloc(i);
 123                 pp=p;
 124                 i2d_DSAparams(dsa,&pp);
 125                 a->parameter=ASN1_TYPE_new();
 126                 a->parameter->type=V_ASN1_SEQUENCE;
 127                 a->parameter->value.sequence=ASN1_STRING_new();
 128                 ASN1_STRING_set(a->parameter->value.sequence,p,i);
 129                 OPENSSL_free(p);
 130                 }
 131         else
 132 #endif
 133                 {
 134                 X509err(X509_F_X509_PUBKEY_SET,X509_R_UNSUPPORTED_ALGORITHM);
 135                 goto err;
 136                 }
 137
 138         if ((i=i2d_PublicKey(pkey,NULL)) <= 0) goto err;
 139         if ((s=(unsigned char *)OPENSSL_malloc(i+1)) == NULL) goto err;
 140         p=s;
 141         i2d_PublicKey(pkey,&p);
 142         if (!M_ASN1_BIT_STRING_set(pk->public_key,s,i)) goto err;
 143         /* Set number of unused bits to zero */
 144         pk->public_key->flags&= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07);
 145         pk->public_key->flags|=ASN1_STRING_FLAG_BITS_LEFT;
 146
 147         OPENSSL_free(s);
 148
 149 #if 0
 150         CRYPTO_add(&pkey->references,1,CRYPTO_LOCK_EVP_PKEY);
 151         pk->pkey=pkey;
 152 #endif
 153
 154         if (*x != NULL)
 155                 X509_PUBKEY_free(*x);
 156
 157         *x=pk;
 158         pk=NULL;
 159
 160         ok=1;
 161 err:
 162         if (pk != NULL) X509_PUBKEY_free(pk);
 163         return(ok);
 164         }
 165
 166 EVP_PKEY *X509_PUBKEY_get(X509_PUBKEY *key)
 167         {
 168         EVP_PKEY *ret=NULL;
 169         long j;
 170         int type;
 171         unsigned char *p;
 172         const unsigned char *cp;
 173 #ifndef NO_DSA
 174         X509_ALGOR *a;
 175 #endif
 176
 177         if (key == NULL) goto err;
 178
 179         if (key->pkey != NULL)
 180             {
 181             CRYPTO_add(&key->pkey->references,1,CRYPTO_LOCK_EVP_PKEY);
 182             return(key->pkey);
 183             }
 184
 185         if (key->public_key == NULL) goto err;
 186
 187         type=OBJ_obj2nid(key->algor->algorithm);
 188         p=key->public_key->data;
 189         j=key->public_key->length;
 190         if ((ret=d2i_PublicKey(type,NULL,&p,(long)j)) == NULL)
 191                 {
 192                 X509err(X509_F_X509_PUBKEY_GET,X509_R_ERR_ASN1_LIB);
 193                 goto err;
 194                 }
 195         ret->save_parameters=0;
 196
 197 #ifndef NO_DSA
 198         a=key->algor;
 199         if (ret->type == EVP_PKEY_DSA)
 200                 {
 201                 if (a->parameter->type == V_ASN1_SEQUENCE)
 202                         {
 203                         ret->pkey.dsa->write_params=0;
 204                         cp=p=a->parameter->value.sequence->data;
 205                         j=a->parameter->value.sequence->length;
 206                         if (!d2i_DSAparams(&ret->pkey.dsa,&cp,(long)j))
 207                                 goto err;
 208                         }
 209                 ret->save_parameters=1;
 210                 }
 211 #endif
 212         key->pkey=ret;
 213         CRYPTO_add(&ret->references,1,CRYPTO_LOCK_EVP_PKEY);
 214         return(ret);
 215 err:
 216         if (ret != NULL)
 217                 EVP_PKEY_free(ret);
 218         return(NULL);
 219         }
 220
 221 /* Now two pseudo ASN1 routines that take an EVP_PKEY structure
 222  * and encode or decode as X509_PUBKEY
 223  */
 224
 225 EVP_PKEY *d2i_PUBKEY(EVP_PKEY **a, unsigned char **pp,
 226              long length)
 227 {
 228         X509_PUBKEY *xpk;
 229         EVP_PKEY *pktmp;
 230         xpk = d2i_X509_PUBKEY(NULL, pp, length);
 231         if(!xpk) return NULL;
 232         pktmp = X509_PUBKEY_get(xpk);
 233         X509_PUBKEY_free(xpk);
 234         if(!pktmp) return NULL;
 235         if(a) {
 236                 EVP_PKEY_free(*a);
 237                 *a = pktmp;
 238         }
 239         return pktmp;
 240 }
 241
 242 int i2d_PUBKEY(EVP_PKEY *a, unsigned char **pp)
 243 {
 244         X509_PUBKEY *xpk=NULL;
 245         int ret;
 246         if(!a) return 0;
 247         if(!X509_PUBKEY_set(&xpk, a)) return 0;
 248         ret = i2d_X509_PUBKEY(xpk, pp);
 249         X509_PUBKEY_free(xpk);
 250         return ret;
 251 }
 252
 253 /* The following are equivalents but which return RSA and DSA
 254  * keys
 255  */
 256 #ifndef NO_RSA
 257 RSA *d2i_RSA_PUBKEY(RSA **a, unsigned char **pp,
 258              long length)
 259 {
 260         EVP_PKEY *pkey;
 261         RSA *key;
 262         unsigned char *q;
 263         q = *pp;
 264         pkey = d2i_PUBKEY(NULL, &q, length);
 265         if(!pkey) return NULL;
 266         key = EVP_PKEY_get1_RSA(pkey);
 267         EVP_PKEY_free(pkey);
 268         if(!key) return NULL;
 269         *pp = q;
 270         if(a) {
 271                 RSA_free(*a);
 272                 *a = key;
 273         }
 274         return key;
 275 }
 276
 277 int i2d_RSA_PUBKEY(RSA *a, unsigned char **pp)
 278 {
 279         EVP_PKEY *pktmp;
 280         int ret;
 281         if(!a) return 0;
 282         pktmp = EVP_PKEY_new();
 283         if(!pktmp) {
 284                 ASN1err(ASN1_F_I2D_RSA_PUBKEY, ERR_R_MALLOC_FAILURE);
 285                 return 0;
 286         }
 287         EVP_PKEY_set1_RSA(pktmp, a);
 288         ret = i2d_PUBKEY(pktmp, pp);
 289         EVP_PKEY_free(pktmp);
 290         return ret;
 291 }
 292 #endif
 293
 294 #ifndef NO_DSA
 295 DSA *d2i_DSA_PUBKEY(DSA **a, unsigned char **pp,
 296              long length)
 297 {
 298         EVP_PKEY *pkey;
 299         DSA *key;
 300         unsigned char *q;
 301         q = *pp;
 302         pkey = d2i_PUBKEY(NULL, &q, length);
 303         if(!pkey) return NULL;
 304         key = EVP_PKEY_get1_DSA(pkey);
 305         EVP_PKEY_free(pkey);
 306         if(!key) return NULL;
 307         *pp = q;
 308         if(a) {
 309                 DSA_free(*a);
 310                 *a = key;
 311         }
 312         return key;
 313 }
 314
 315 int i2d_DSA_PUBKEY(DSA *a, unsigned char **pp)
 316 {
 317         EVP_PKEY *pktmp;
 318         int ret;
 319         if(!a) return 0;
 320         pktmp = EVP_PKEY_new();
 321         if(!pktmp) {
 322                 ASN1err(ASN1_F_I2D_DSA_PUBKEY, ERR_R_MALLOC_FAILURE);
 323                 return 0;
 324         }
 325         EVP_PKEY_set1_DSA(pktmp, a);
 326         ret = i2d_PUBKEY(pktmp, pp);
 327         EVP_PKEY_free(pktmp);
 328         return ret;
 329 }
 330 #endif