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 "internal/cryptlib.h"
  61 #include <openssl/asn1t.h>
  62 #include <openssl/x509.h>
  63 #include "internal/asn1_int.h"
  64 #include "internal/evp_int.h"
  65 #ifndef OPENSSL_NO_RSA
  66 # include <openssl/rsa.h>
  67 #endif
  68 #ifndef OPENSSL_NO_DSA
  69 # include <openssl/dsa.h>
  70 #endif
  71
  72 /* Minor tweak to operation: free up EVP_PKEY */
  73 static int pubkey_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
  74                      void *exarg)
  75 {
  76     if (operation == ASN1_OP_FREE_POST) {
  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
  94     if (x == NULL)
  95         return (0);
  96
  97     if ((pk = X509_PUBKEY_new()) == NULL)
  98         goto error;
  99
 100     if (pkey->ameth) {
 101         if (pkey->ameth->pub_encode) {
 102             if (!pkey->ameth->pub_encode(pk, pkey)) {
 103                 X509err(X509_F_X509_PUBKEY_SET,
 104                         X509_R_PUBLIC_KEY_ENCODE_ERROR);
 105                 goto error;
 106             }
 107         } else {
 108             X509err(X509_F_X509_PUBKEY_SET, X509_R_METHOD_NOT_SUPPORTED);
 109             goto error;
 110         }
 111     } else {
 112         X509err(X509_F_X509_PUBKEY_SET, X509_R_UNSUPPORTED_ALGORITHM);
 113         goto error;
 114     }
 115
 116     X509_PUBKEY_free(*x);
 117     *x = pk;
 118     return 1;
 119
 120  error:
 121     X509_PUBKEY_free(pk);
 122     return 0;
 123 }
 124
 125 EVP_PKEY *X509_PUBKEY_get0(X509_PUBKEY *key)
 126 {
 127     EVP_PKEY *ret = NULL;
 128
 129     if (key == NULL)
 130         goto error;
 131
 132     if (key->pkey != NULL)
 133         return key->pkey;
 134
 135     if (key->public_key == NULL)
 136         goto error;
 137
 138     if ((ret = EVP_PKEY_new()) == NULL) {
 139         X509err(X509_F_X509_PUBKEY_GET0, ERR_R_MALLOC_FAILURE);
 140         goto error;
 141     }
 142
 143     if (!EVP_PKEY_set_type(ret, OBJ_obj2nid(key->algor->algorithm))) {
 144         X509err(X509_F_X509_PUBKEY_GET0, X509_R_UNSUPPORTED_ALGORITHM);
 145         goto error;
 146     }
 147
 148     if (ret->ameth->pub_decode) {
 149         if (!ret->ameth->pub_decode(ret, key)) {
 150             X509err(X509_F_X509_PUBKEY_GET0, X509_R_PUBLIC_KEY_DECODE_ERROR);
 151             goto error;
 152         }
 153     } else {
 154         X509err(X509_F_X509_PUBKEY_GET0, X509_R_METHOD_NOT_SUPPORTED);
 155         goto error;
 156     }
 157
 158     /* Check to see if another thread set key->pkey first */
 159     CRYPTO_w_lock(CRYPTO_LOCK_EVP_PKEY);
 160     if (key->pkey) {
 161         CRYPTO_w_unlock(CRYPTO_LOCK_EVP_PKEY);
 162         EVP_PKEY_free(ret);
 163         ret = key->pkey;
 164     } else {
 165         key->pkey = ret;
 166         CRYPTO_w_unlock(CRYPTO_LOCK_EVP_PKEY);
 167     }
 168
 169     return ret;
 170
 171  error:
 172     EVP_PKEY_free(ret);
 173     return (NULL);
 174 }
 175
 176 EVP_PKEY *X509_PUBKEY_get(X509_PUBKEY *key)
 177 {
 178     EVP_PKEY *ret = X509_PUBKEY_get0(key);
 179     if (ret != NULL)
 180         EVP_PKEY_up_ref(ret);
 181     return ret;
 182 }
 183
 184 /*
 185  * Now two pseudo ASN1 routines that take an EVP_PKEY structure and encode or
 186  * decode as X509_PUBKEY
 187  */
 188
 189 EVP_PKEY *d2i_PUBKEY(EVP_PKEY **a, const unsigned char **pp, long length)
 190 {
 191     X509_PUBKEY *xpk;
 192     EVP_PKEY *pktmp;
 193     const unsigned char *q;
 194     q = *pp;
 195     xpk = d2i_X509_PUBKEY(NULL, &q, length);
 196     if (!xpk)
 197         return NULL;
 198     pktmp = X509_PUBKEY_get(xpk);
 199     X509_PUBKEY_free(xpk);
 200     if (!pktmp)
 201         return NULL;
 202     *pp = q;
 203     if (a) {
 204         EVP_PKEY_free(*a);
 205         *a = pktmp;
 206     }
 207     return pktmp;
 208 }
 209
 210 int i2d_PUBKEY(EVP_PKEY *a, unsigned char **pp)
 211 {
 212     X509_PUBKEY *xpk = NULL;
 213     int ret;
 214     if (!a)
 215         return 0;
 216     if (!X509_PUBKEY_set(&xpk, a))
 217         return 0;
 218     ret = i2d_X509_PUBKEY(xpk, pp);
 219     X509_PUBKEY_free(xpk);
 220     return ret;
 221 }
 222
 223 /*
 224  * The following are equivalents but which return RSA and DSA keys
 225  */
 226 #ifndef OPENSSL_NO_RSA
 227 RSA *d2i_RSA_PUBKEY(RSA **a, const unsigned char **pp, long length)
 228 {
 229     EVP_PKEY *pkey;
 230     RSA *key;
 231     const unsigned char *q;
 232     q = *pp;
 233     pkey = d2i_PUBKEY(NULL, &q, length);
 234     if (!pkey)
 235         return NULL;
 236     key = EVP_PKEY_get1_RSA(pkey);
 237     EVP_PKEY_free(pkey);
 238     if (!key)
 239         return NULL;
 240     *pp = q;
 241     if (a) {
 242         RSA_free(*a);
 243         *a = key;
 244     }
 245     return key;
 246 }
 247
 248 int i2d_RSA_PUBKEY(RSA *a, unsigned char **pp)
 249 {
 250     EVP_PKEY *pktmp;
 251     int ret;
 252     if (!a)
 253         return 0;
 254     pktmp = EVP_PKEY_new();
 255     if (pktmp == NULL) {
 256         ASN1err(ASN1_F_I2D_RSA_PUBKEY, ERR_R_MALLOC_FAILURE);
 257         return 0;
 258     }
 259     EVP_PKEY_set1_RSA(pktmp, a);
 260     ret = i2d_PUBKEY(pktmp, pp);
 261     EVP_PKEY_free(pktmp);
 262     return ret;
 263 }
 264 #endif
 265
 266 #ifndef OPENSSL_NO_DSA
 267 DSA *d2i_DSA_PUBKEY(DSA **a, const unsigned char **pp, long length)
 268 {
 269     EVP_PKEY *pkey;
 270     DSA *key;
 271     const unsigned char *q;
 272     q = *pp;
 273     pkey = d2i_PUBKEY(NULL, &q, length);
 274     if (!pkey)
 275         return NULL;
 276     key = EVP_PKEY_get1_DSA(pkey);
 277     EVP_PKEY_free(pkey);
 278     if (!key)
 279         return NULL;
 280     *pp = q;
 281     if (a) {
 282         DSA_free(*a);
 283         *a = key;
 284     }
 285     return key;
 286 }
 287
 288 int i2d_DSA_PUBKEY(DSA *a, unsigned char **pp)
 289 {
 290     EVP_PKEY *pktmp;
 291     int ret;
 292     if (!a)
 293         return 0;
 294     pktmp = EVP_PKEY_new();
 295     if (pktmp == NULL) {
 296         ASN1err(ASN1_F_I2D_DSA_PUBKEY, ERR_R_MALLOC_FAILURE);
 297         return 0;
 298     }
 299     EVP_PKEY_set1_DSA(pktmp, a);
 300     ret = i2d_PUBKEY(pktmp, pp);
 301     EVP_PKEY_free(pktmp);
 302     return ret;
 303 }
 304 #endif
 305
 306 #ifndef OPENSSL_NO_EC
 307 EC_KEY *d2i_EC_PUBKEY(EC_KEY **a, const unsigned char **pp, long length)
 308 {
 309     EVP_PKEY *pkey;
 310     EC_KEY *key;
 311     const unsigned char *q;
 312     q = *pp;
 313     pkey = d2i_PUBKEY(NULL, &q, length);
 314     if (!pkey)
 315         return (NULL);
 316     key = EVP_PKEY_get1_EC_KEY(pkey);
 317     EVP_PKEY_free(pkey);
 318     if (!key)
 319         return (NULL);
 320     *pp = q;
 321     if (a) {
 322         EC_KEY_free(*a);
 323         *a = key;
 324     }
 325     return (key);
 326 }
 327
 328 int i2d_EC_PUBKEY(EC_KEY *a, unsigned char **pp)
 329 {
 330     EVP_PKEY *pktmp;
 331     int ret;
 332     if (!a)
 333         return (0);
 334     if ((pktmp = EVP_PKEY_new()) == NULL) {
 335         ASN1err(ASN1_F_I2D_EC_PUBKEY, ERR_R_MALLOC_FAILURE);
 336         return (0);
 337     }
 338     EVP_PKEY_set1_EC_KEY(pktmp, a);
 339     ret = i2d_PUBKEY(pktmp, pp);
 340     EVP_PKEY_free(pktmp);
 341     return (ret);
 342 }
 343 #endif
 344
 345 int X509_PUBKEY_set0_param(X509_PUBKEY *pub, ASN1_OBJECT *aobj,
 346                            int ptype, void *pval,
 347                            unsigned char *penc, int penclen)
 348 {
 349     if (!X509_ALGOR_set0(pub->algor, aobj, ptype, pval))
 350         return 0;
 351     if (penc) {
 352         OPENSSL_free(pub->public_key->data);
 353         pub->public_key->data = penc;
 354         pub->public_key->length = penclen;
 355         /* Set number of unused bits to zero */
 356         pub->public_key->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
 357         pub->public_key->flags |= ASN1_STRING_FLAG_BITS_LEFT;
 358     }
 359     return 1;
 360 }
 361
 362 int X509_PUBKEY_get0_param(ASN1_OBJECT **ppkalg,
 363                            const unsigned char **pk, int *ppklen,
 364                            X509_ALGOR **pa, X509_PUBKEY *pub)
 365 {
 366     if (ppkalg)
 367         *ppkalg = pub->algor->algorithm;
 368     if (pk) {
 369         *pk = pub->public_key->data;
 370         *ppklen = pub->public_key->length;
 371     }
 372     if (pa)
 373         *pa = pub->algor;
 374     return 1;
 375 }