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