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