crypto/x509/x_pubkey.c

   1 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   2  * All rights reserved.
   3  *
   4  * This package is an SSL implementation written
   5  * by Eric Young (eay@cryptsoft.com).
   6  * The implementation was written so as to conform with Netscapes SSL.
   7  *
   8  * This library is free for commercial and non-commercial use as long as
   9  * the following conditions are aheared to.  The following conditions
  10  * apply to all code found in this distribution, be it the RC4, RSA,
  11  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  12  * included with this distribution is covered by the same copyright terms
  13  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  14  *
  15  * Copyright remains Eric Young's, and as such any Copyright notices in
  16  * the code are not to be removed.
  17  * If this package is used in a product, Eric Young should be given attribution
  18  * as the author of the parts of the library used.
  19  * This can be in the form of a textual message at program startup or
  20  * in documentation (online or textual) provided with the package.
  21  *
  22  * Redistribution and use in source and binary forms, with or without
  23  * modification, are permitted provided that the following conditions
  24  * are met:
  25  * 1. Redistributions of source code must retain the copyright
  26  *    notice, this list of conditions and the following disclaimer.
  27  * 2. Redistributions in binary form must reproduce the above copyright
  28  *    notice, this list of conditions and the following disclaimer in the
  29  *    documentation and/or other materials provided with the distribution.
  30  * 3. All advertising materials mentioning features or use of this software
  31  *    must display the following acknowledgement:
  32  *    "This product includes cryptographic software written by
  33  *     Eric Young (eay@cryptsoft.com)"
  34  *    The word 'cryptographic' can be left out if the rouines from the library
  35  *    being used are not cryptographic related :-).
  36  * 4. If you include any Windows specific code (or a derivative thereof) from
  37  *    the apps directory (application code) you must include an acknowledgement:
  38  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  41  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  43  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  44  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  45  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  46  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  48  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  49  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  50  * SUCH DAMAGE.
  51  *
  52  * The licence and distribution terms for any publically available version or
  53  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  54  * copied and put under another distribution licence
  55  * [including the GNU Public Licence.]
  56  */
  57
  58 #include <stdio.h>
  59 #include "internal/cryptlib.h"
  60 #include <openssl/asn1t.h>
  61 #include <openssl/x509.h>
  62 #include "internal/asn1_int.h"
  63 #include "internal/evp_int.h"
  64 #include "internal/x509_int.h"
  65 #include <openssl/rsa.h>
  66 #include <openssl/dsa.h>
  67
  68 struct X509_pubkey_st {
  69     X509_ALGOR *algor;
  70     ASN1_BIT_STRING *public_key;
  71     EVP_PKEY *pkey;
  72     CRYPTO_RWLOCK *lock;
  73 };
  74
  75 /* Minor tweak to operation: free up EVP_PKEY */
  76 static int pubkey_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
  77                      void *exarg)
  78 {
  79     if (operation == ASN1_OP_NEW_POST) {
  80         X509_PUBKEY *pubkey = (X509_PUBKEY *)*pval;
  81         pubkey->lock = CRYPTO_THREAD_lock_new();
  82         if (pubkey->lock == NULL)
  83             return 0;
  84     }
  85     if (operation == ASN1_OP_FREE_POST) {
  86         X509_PUBKEY *pubkey = (X509_PUBKEY *)*pval;
  87         CRYPTO_THREAD_lock_free(pubkey->lock);
  88         EVP_PKEY_free(pubkey->pkey);
  89     }
  90     return 1;
  91 }
  92
  93 ASN1_SEQUENCE_cb(X509_PUBKEY, pubkey_cb) = {
  94         ASN1_SIMPLE(X509_PUBKEY, algor, X509_ALGOR),
  95         ASN1_SIMPLE(X509_PUBKEY, public_key, ASN1_BIT_STRING)
  96 } ASN1_SEQUENCE_END_cb(X509_PUBKEY, X509_PUBKEY)
  97
  98 IMPLEMENT_ASN1_FUNCTIONS(X509_PUBKEY)
  99
 100 int X509_PUBKEY_set(X509_PUBKEY **x, EVP_PKEY *pkey)
 101 {
 102     X509_PUBKEY *pk = NULL;
 103
 104     if (x == NULL)
 105         return (0);
 106
 107     if ((pk = X509_PUBKEY_new()) == NULL)
 108         goto error;
 109
 110     if (pkey->ameth) {
 111         if (pkey->ameth->pub_encode) {
 112             if (!pkey->ameth->pub_encode(pk, pkey)) {
 113                 X509err(X509_F_X509_PUBKEY_SET,
 114                         X509_R_PUBLIC_KEY_ENCODE_ERROR);
 115                 goto error;
 116             }
 117         } else {
 118             X509err(X509_F_X509_PUBKEY_SET, X509_R_METHOD_NOT_SUPPORTED);
 119             goto error;
 120         }
 121     } else {
 122         X509err(X509_F_X509_PUBKEY_SET, X509_R_UNSUPPORTED_ALGORITHM);
 123         goto error;
 124     }
 125
 126     X509_PUBKEY_free(*x);
 127     *x = pk;
 128     return 1;
 129
 130  error:
 131     X509_PUBKEY_free(pk);
 132     return 0;
 133 }
 134
 135 EVP_PKEY *X509_PUBKEY_get0(X509_PUBKEY *key)
 136 {
 137     EVP_PKEY *ret = NULL;
 138
 139     if (key == NULL)
 140         goto error;
 141
 142     if (key->pkey != NULL)
 143         return key->pkey;
 144
 145     if (key->public_key == NULL)
 146         goto error;
 147
 148     if ((ret = EVP_PKEY_new()) == NULL) {
 149         X509err(X509_F_X509_PUBKEY_GET0, ERR_R_MALLOC_FAILURE);
 150         goto error;
 151     }
 152
 153     if (!EVP_PKEY_set_type(ret, OBJ_obj2nid(key->algor->algorithm))) {
 154         X509err(X509_F_X509_PUBKEY_GET0, X509_R_UNSUPPORTED_ALGORITHM);
 155         goto error;
 156     }
 157
 158     if (ret->ameth->pub_decode) {
 159         if (!ret->ameth->pub_decode(ret, key)) {
 160             X509err(X509_F_X509_PUBKEY_GET0, X509_R_PUBLIC_KEY_DECODE_ERROR);
 161             goto error;
 162         }
 163     } else {
 164         X509err(X509_F_X509_PUBKEY_GET0, X509_R_METHOD_NOT_SUPPORTED);
 165         goto error;
 166     }
 167
 168     /* Check to see if another thread set key->pkey first */
 169     CRYPTO_THREAD_write_lock(key->lock);
 170     if (key->pkey) {
 171         CRYPTO_THREAD_unlock(key->lock);
 172         EVP_PKEY_free(ret);
 173         ret = key->pkey;
 174     } else {
 175         key->pkey = ret;
 176         CRYPTO_THREAD_unlock(key->lock);
 177     }
 178
 179     return ret;
 180
 181  error:
 182     EVP_PKEY_free(ret);
 183     return (NULL);
 184 }
 185
 186 EVP_PKEY *X509_PUBKEY_get(X509_PUBKEY *key)
 187 {
 188     EVP_PKEY *ret = X509_PUBKEY_get0(key);
 189     if (ret != NULL)
 190         EVP_PKEY_up_ref(ret);
 191     return ret;
 192 }
 193
 194 /*
 195  * Now two pseudo ASN1 routines that take an EVP_PKEY structure and encode or
 196  * decode as X509_PUBKEY
 197  */
 198
 199 EVP_PKEY *d2i_PUBKEY(EVP_PKEY **a, const unsigned char **pp, long length)
 200 {
 201     X509_PUBKEY *xpk;
 202     EVP_PKEY *pktmp;
 203     const unsigned char *q;
 204     q = *pp;
 205     xpk = d2i_X509_PUBKEY(NULL, &q, length);
 206     if (!xpk)
 207         return NULL;
 208     pktmp = X509_PUBKEY_get(xpk);
 209     X509_PUBKEY_free(xpk);
 210     if (!pktmp)
 211         return NULL;
 212     *pp = q;
 213     if (a) {
 214         EVP_PKEY_free(*a);
 215         *a = pktmp;
 216     }
 217     return pktmp;
 218 }
 219
 220 int i2d_PUBKEY(EVP_PKEY *a, unsigned char **pp)
 221 {
 222     X509_PUBKEY *xpk = NULL;
 223     int ret;
 224     if (!a)
 225         return 0;
 226     if (!X509_PUBKEY_set(&xpk, a))
 227         return 0;
 228     ret = i2d_X509_PUBKEY(xpk, pp);
 229     X509_PUBKEY_free(xpk);
 230     return ret;
 231 }
 232
 233 /*
 234  * The following are equivalents but which return RSA and DSA keys
 235  */
 236 #ifndef OPENSSL_NO_RSA
 237 RSA *d2i_RSA_PUBKEY(RSA **a, const unsigned char **pp, long length)
 238 {
 239     EVP_PKEY *pkey;
 240     RSA *key;
 241     const unsigned char *q;
 242     q = *pp;
 243     pkey = d2i_PUBKEY(NULL, &q, length);
 244     if (!pkey)
 245         return NULL;
 246     key = EVP_PKEY_get1_RSA(pkey);
 247     EVP_PKEY_free(pkey);
 248     if (!key)
 249         return NULL;
 250     *pp = q;
 251     if (a) {
 252         RSA_free(*a);
 253         *a = key;
 254     }
 255     return key;
 256 }
 257
 258 int i2d_RSA_PUBKEY(RSA *a, unsigned char **pp)
 259 {
 260     EVP_PKEY *pktmp;
 261     int ret;
 262     if (!a)
 263         return 0;
 264     pktmp = EVP_PKEY_new();
 265     if (pktmp == NULL) {
 266         ASN1err(ASN1_F_I2D_RSA_PUBKEY, ERR_R_MALLOC_FAILURE);
 267         return 0;
 268     }
 269     EVP_PKEY_set1_RSA(pktmp, a);
 270     ret = i2d_PUBKEY(pktmp, pp);
 271     EVP_PKEY_free(pktmp);
 272     return ret;
 273 }
 274 #endif
 275
 276 #ifndef OPENSSL_NO_DSA
 277 DSA *d2i_DSA_PUBKEY(DSA **a, const unsigned char **pp, long length)
 278 {
 279     EVP_PKEY *pkey;
 280     DSA *key;
 281     const unsigned char *q;
 282     q = *pp;
 283     pkey = d2i_PUBKEY(NULL, &q, length);
 284     if (!pkey)
 285         return NULL;
 286     key = EVP_PKEY_get1_DSA(pkey);
 287     EVP_PKEY_free(pkey);
 288     if (!key)
 289         return NULL;
 290     *pp = q;
 291     if (a) {
 292         DSA_free(*a);
 293         *a = key;
 294     }
 295     return key;
 296 }
 297
 298 int i2d_DSA_PUBKEY(DSA *a, unsigned char **pp)
 299 {
 300     EVP_PKEY *pktmp;
 301     int ret;
 302     if (!a)
 303         return 0;
 304     pktmp = EVP_PKEY_new();
 305     if (pktmp == NULL) {
 306         ASN1err(ASN1_F_I2D_DSA_PUBKEY, ERR_R_MALLOC_FAILURE);
 307         return 0;
 308     }
 309     EVP_PKEY_set1_DSA(pktmp, a);
 310     ret = i2d_PUBKEY(pktmp, pp);
 311     EVP_PKEY_free(pktmp);
 312     return ret;
 313 }
 314 #endif
 315
 316 #ifndef OPENSSL_NO_EC
 317 EC_KEY *d2i_EC_PUBKEY(EC_KEY **a, const unsigned char **pp, long length)
 318 {
 319     EVP_PKEY *pkey;
 320     EC_KEY *key;
 321     const unsigned char *q;
 322     q = *pp;
 323     pkey = d2i_PUBKEY(NULL, &q, length);
 324     if (!pkey)
 325         return (NULL);
 326     key = EVP_PKEY_get1_EC_KEY(pkey);
 327     EVP_PKEY_free(pkey);
 328     if (!key)
 329         return (NULL);
 330     *pp = q;
 331     if (a) {
 332         EC_KEY_free(*a);
 333         *a = key;
 334     }
 335     return (key);
 336 }
 337
 338 int i2d_EC_PUBKEY(EC_KEY *a, unsigned char **pp)
 339 {
 340     EVP_PKEY *pktmp;
 341     int ret;
 342     if (!a)
 343         return (0);
 344     if ((pktmp = EVP_PKEY_new()) == NULL) {
 345         ASN1err(ASN1_F_I2D_EC_PUBKEY, ERR_R_MALLOC_FAILURE);
 346         return (0);
 347     }
 348     EVP_PKEY_set1_EC_KEY(pktmp, a);
 349     ret = i2d_PUBKEY(pktmp, pp);
 350     EVP_PKEY_free(pktmp);
 351     return (ret);
 352 }
 353 #endif
 354
 355 int X509_PUBKEY_set0_param(X509_PUBKEY *pub, ASN1_OBJECT *aobj,
 356                            int ptype, void *pval,
 357                            unsigned char *penc, int penclen)
 358 {
 359     if (!X509_ALGOR_set0(pub->algor, aobj, ptype, pval))
 360         return 0;
 361     if (penc) {
 362         OPENSSL_free(pub->public_key->data);
 363         pub->public_key->data = penc;
 364         pub->public_key->length = penclen;
 365         /* Set number of unused bits to zero */
 366         pub->public_key->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
 367         pub->public_key->flags |= ASN1_STRING_FLAG_BITS_LEFT;
 368     }
 369     return 1;
 370 }
 371
 372 int X509_PUBKEY_get0_param(ASN1_OBJECT **ppkalg,
 373                            const unsigned char **pk, int *ppklen,
 374                            X509_ALGOR **pa, X509_PUBKEY *pub)
 375 {
 376     if (ppkalg)
 377         *ppkalg = pub->algor->algorithm;
 378     if (pk) {
 379         *pk = pub->public_key->data;
 380         *ppklen = pub->public_key->length;
 381     }
 382     if (pa)
 383         *pa = pub->algor;
 384     return 1;
 385 }
 386
 387 ASN1_BIT_STRING *X509_get0_pubkey_bitstr(const X509 *x)
 388 {
 389     if (x == NULL)
 390         return NULL;
 391     return x->cert_info.key->public_key;
 392 }