crypto/evp/p_lib.c

   1 /* crypto/evp/p_lib.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/bn.h>
  62 #include <openssl/err.h>
  63 #include <openssl/objects.h>
  64 #include <openssl/evp.h>
  65 #include <openssl/asn1_mac.h>
  66 #include <openssl/x509.h>
  67 #ifndef OPENSSL_NO_RSA
  68 #include <openssl/rsa.h>
  69 #endif
  70 #ifndef OPENSSL_NO_DSA
  71 #include <openssl/dsa.h>
  72 #endif
  73 #ifndef OPENSSL_NO_DH
  74 #include <openssl/dh.h>
  75 #endif
  76
  77 #ifndef OPENSSL_NO_ENGINE
  78 #include <openssl/engine.h>
  79 #endif
  80
  81 #include "asn1_locl.h"
  82
  83 static void EVP_PKEY_free_it(EVP_PKEY *x);
  84
  85 int EVP_PKEY_bits(EVP_PKEY *pkey)
  86         {
  87         if (pkey && pkey->ameth && pkey->ameth->pkey_bits)
  88                 return pkey->ameth->pkey_bits(pkey);
  89         return 0;
  90         }
  91
  92 int EVP_PKEY_size(EVP_PKEY *pkey)
  93         {
  94         if (pkey && pkey->ameth && pkey->ameth->pkey_size)
  95                 return pkey->ameth->pkey_size(pkey);
  96         return 0;
  97         }
  98
  99 int EVP_PKEY_save_parameters(EVP_PKEY *pkey, int mode)
 100         {
 101 #ifndef OPENSSL_NO_DSA
 102         if (pkey->type == EVP_PKEY_DSA)
 103                 {
 104                 int ret=pkey->save_parameters;
 105
 106                 if (mode >= 0)
 107                         pkey->save_parameters=mode;
 108                 return(ret);
 109                 }
 110 #endif
 111 #ifndef OPENSSL_NO_EC
 112         if (pkey->type == EVP_PKEY_EC)
 113                 {
 114                 int ret = pkey->save_parameters;
 115
 116                 if (mode >= 0)
 117                         pkey->save_parameters = mode;
 118                 return(ret);
 119                 }
 120 #endif
 121         return(0);
 122         }
 123
 124 int EVP_PKEY_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from)
 125         {
 126         if (to->type != from->type)
 127                 {
 128                 EVPerr(EVP_F_EVP_PKEY_COPY_PARAMETERS,EVP_R_DIFFERENT_KEY_TYPES);
 129                 goto err;
 130                 }
 131
 132         if (EVP_PKEY_missing_parameters(from))
 133                 {
 134                 EVPerr(EVP_F_EVP_PKEY_COPY_PARAMETERS,EVP_R_MISSING_PARAMETERS);
 135                 goto err;
 136                 }
 137         if (from->ameth && from->ameth->param_copy)
 138                 return from->ameth->param_copy(to, from);
 139 err:
 140         return 0;
 141         }
 142
 143 int EVP_PKEY_missing_parameters(const EVP_PKEY *pkey)
 144         {
 145         if (pkey->ameth && pkey->ameth->param_missing)
 146                 return pkey->ameth->param_missing(pkey);
 147         return 0;
 148         }
 149
 150 int EVP_PKEY_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b)
 151         {
 152         if (a->type != b->type)
 153                 return -1;
 154         if (a->ameth && a->ameth->param_cmp)
 155                 return a->ameth->param_cmp(a, b);
 156         return -2;
 157         }
 158
 159 int EVP_PKEY_cmp(const EVP_PKEY *a, const EVP_PKEY *b)
 160         {
 161         if (a->type != b->type)
 162                 return -1;
 163
 164         if (a->ameth)
 165                 {
 166                 int ret;
 167                 /* Compare parameters if the algorithm has them */
 168                 if (a->ameth->param_cmp)
 169                         {
 170                         ret = a->ameth->param_cmp(a, b);
 171                         if (ret <= 0)
 172                                 return ret;
 173                         }
 174
 175                 if (a->ameth->pub_cmp)
 176                         return a->ameth->pub_cmp(a, b);
 177                 }
 178
 179         return -2;
 180         }
 181
 182 EVP_PKEY *EVP_PKEY_new(void)
 183         {
 184         EVP_PKEY *ret;
 185
 186         ret=(EVP_PKEY *)OPENSSL_malloc(sizeof(EVP_PKEY));
 187         if (ret == NULL)
 188                 {
 189                 EVPerr(EVP_F_EVP_PKEY_NEW,ERR_R_MALLOC_FAILURE);
 190                 return(NULL);
 191                 }
 192         ret->type=EVP_PKEY_NONE;
 193         ret->save_type=EVP_PKEY_NONE;
 194         ret->references=1;
 195         ret->ameth=NULL;
 196         ret->engine=NULL;
 197         ret->pkey.ptr=NULL;
 198         ret->attributes=NULL;
 199         ret->save_parameters=1;
 200         return(ret);
 201         }
 202
 203 /* Setup a public key ASN1 method and ENGINE from a NID or a string.
 204  * If pkey is NULL just return 1 or 0 if the algorithm exists.
 205  */
 206
 207 static int pkey_set_type(EVP_PKEY *pkey, int type, const char *str, int len)
 208         {
 209         const EVP_PKEY_ASN1_METHOD *ameth;
 210         ENGINE *e = NULL;
 211         if (pkey)
 212                 {
 213                 if (pkey->pkey.ptr)
 214                         EVP_PKEY_free_it(pkey);
 215                 /* If key type matches and a method exists then this
 216                  * lookup has succeeded once so just indicate success.
 217                  */
 218                 if ((type == pkey->save_type) && pkey->ameth)
 219                         return 1;
 220 #ifndef OPENSSL_NO_ENGINE
 221                 /* If we have an ENGINE release it */
 222                 if (pkey->engine)
 223                         {
 224                         ENGINE_finish(pkey->engine);
 225                         pkey->engine = NULL;
 226                         }
 227 #endif
 228                 }
 229         if (str)
 230                 ameth = EVP_PKEY_asn1_find_str(&e, str, len);
 231         else
 232                 ameth = EVP_PKEY_asn1_find(&e, type);
 233 #ifndef OPENSSL_NO_ENGINE
 234         if (!pkey && e)
 235                 ENGINE_finish(e);
 236 #endif
 237         if (!ameth)
 238                 {
 239                 EVPerr(EVP_F_PKEY_SET_TYPE, EVP_R_UNSUPPORTED_ALGORITHM);
 240                 return 0;
 241                 }
 242         if (pkey)
 243                 {
 244                 pkey->ameth = ameth;
 245                 pkey->engine = e;
 246
 247                 pkey->type = pkey->ameth->pkey_id;
 248                 pkey->save_type=type;
 249                 }
 250         return 1;
 251         }
 252
 253 int EVP_PKEY_set_type(EVP_PKEY *pkey, int type)
 254         {
 255         return pkey_set_type(pkey, type, NULL, -1);
 256         }
 257
 258 int EVP_PKEY_set_type_str(EVP_PKEY *pkey, const char *str, int len)
 259         {
 260         return pkey_set_type(pkey, EVP_PKEY_NONE, str, len);
 261         }
 262
 263 int EVP_PKEY_assign(EVP_PKEY *pkey, int type, void *key)
 264         {
 265         if (!EVP_PKEY_set_type(pkey, type))
 266                 return 0;
 267         pkey->pkey.ptr=key;
 268         return (key != NULL);
 269         }
 270
 271 void *EVP_PKEY_get0(EVP_PKEY *pkey)
 272         {
 273         return pkey->pkey.ptr;
 274         }
 275
 276 #ifndef OPENSSL_NO_RSA
 277 int EVP_PKEY_set1_RSA(EVP_PKEY *pkey, RSA *key)
 278 {
 279         int ret = EVP_PKEY_assign_RSA(pkey, key);
 280         if(ret)
 281                 RSA_up_ref(key);
 282         return ret;
 283 }
 284
 285 RSA *EVP_PKEY_get1_RSA(EVP_PKEY *pkey)
 286         {
 287         if(pkey->type != EVP_PKEY_RSA) {
 288                 EVPerr(EVP_F_EVP_PKEY_GET1_RSA, EVP_R_EXPECTING_AN_RSA_KEY);
 289                 return NULL;
 290         }
 291         RSA_up_ref(pkey->pkey.rsa);
 292         return pkey->pkey.rsa;
 293 }
 294 #endif
 295
 296 #ifndef OPENSSL_NO_DSA
 297 int EVP_PKEY_set1_DSA(EVP_PKEY *pkey, DSA *key)
 298 {
 299         int ret = EVP_PKEY_assign_DSA(pkey, key);
 300         if(ret)
 301                 DSA_up_ref(key);
 302         return ret;
 303 }
 304
 305 DSA *EVP_PKEY_get1_DSA(EVP_PKEY *pkey)
 306         {
 307         if(pkey->type != EVP_PKEY_DSA) {
 308                 EVPerr(EVP_F_EVP_PKEY_GET1_DSA, EVP_R_EXPECTING_A_DSA_KEY);
 309                 return NULL;
 310         }
 311         DSA_up_ref(pkey->pkey.dsa);
 312         return pkey->pkey.dsa;
 313 }
 314 #endif
 315
 316 #ifndef OPENSSL_NO_EC
 317
 318 int EVP_PKEY_set1_EC_KEY(EVP_PKEY *pkey, EC_KEY *key)
 319 {
 320         int ret = EVP_PKEY_assign_EC_KEY(pkey,key);
 321         if (ret)
 322                 EC_KEY_up_ref(key);
 323         return ret;
 324 }
 325
 326 EC_KEY *EVP_PKEY_get1_EC_KEY(EVP_PKEY *pkey)
 327 {
 328         if (pkey->type != EVP_PKEY_EC)
 329         {
 330                 EVPerr(EVP_F_EVP_PKEY_GET1_EC_KEY, EVP_R_EXPECTING_A_EC_KEY);
 331                 return NULL;
 332         }
 333         EC_KEY_up_ref(pkey->pkey.ec);
 334         return pkey->pkey.ec;
 335 }
 336 #endif
 337
 338
 339 #ifndef OPENSSL_NO_DH
 340
 341 int EVP_PKEY_set1_DH(EVP_PKEY *pkey, DH *key)
 342 {
 343         int ret = EVP_PKEY_assign_DH(pkey, key);
 344         if(ret)
 345                 DH_up_ref(key);
 346         return ret;
 347 }
 348
 349 DH *EVP_PKEY_get1_DH(EVP_PKEY *pkey)
 350         {
 351         if(pkey->type != EVP_PKEY_DH) {
 352                 EVPerr(EVP_F_EVP_PKEY_GET1_DH, EVP_R_EXPECTING_A_DH_KEY);
 353                 return NULL;
 354         }
 355         DH_up_ref(pkey->pkey.dh);
 356         return pkey->pkey.dh;
 357 }
 358 #endif
 359
 360 int EVP_PKEY_type(int type)
 361         {
 362         int ret;
 363         const EVP_PKEY_ASN1_METHOD *ameth;
 364         ENGINE *e;
 365         ameth = EVP_PKEY_asn1_find(&e, type);
 366         if (ameth)
 367                 ret = ameth->pkey_id;
 368         else
 369                 ret = NID_undef;
 370 #ifndef OPENSSL_NO_ENGINE
 371         if (e)
 372                 ENGINE_finish(e);
 373 #endif
 374         return ret;
 375         }
 376
 377 int EVP_PKEY_id(const EVP_PKEY *pkey)
 378         {
 379         return pkey->type;
 380         }
 381
 382 int EVP_PKEY_base_id(const EVP_PKEY *pkey)
 383         {
 384         return EVP_PKEY_type(pkey->type);
 385         }
 386
 387 void EVP_PKEY_free(EVP_PKEY *x)
 388         {
 389         int i;
 390
 391         if (x == NULL) return;
 392
 393         i=CRYPTO_add(&x->references,-1,CRYPTO_LOCK_EVP_PKEY);
 394 #ifdef REF_PRINT
 395         REF_PRINT("EVP_PKEY",x);
 396 #endif
 397         if (i > 0) return;
 398 #ifdef REF_CHECK
 399         if (i < 0)
 400                 {
 401                 fprintf(stderr,"EVP_PKEY_free, bad reference count\n");
 402                 abort();
 403                 }
 404 #endif
 405         EVP_PKEY_free_it(x);
 406         if (x->attributes)
 407                 sk_X509_ATTRIBUTE_pop_free(x->attributes, X509_ATTRIBUTE_free);
 408         OPENSSL_free(x);
 409         }
 410
 411 static void EVP_PKEY_free_it(EVP_PKEY *x)
 412         {
 413         if (x->ameth && x->ameth->pkey_free)
 414                 {
 415                 x->ameth->pkey_free(x);
 416                 x->pkey.ptr = NULL;
 417                 }
 418 #ifndef OPENSSL_NO_ENGINE
 419         if (x->engine)
 420                 {
 421                 ENGINE_finish(x->engine);
 422                 x->engine = NULL;
 423                 }
 424 #endif
 425         }
 426
 427 static int unsup_alg(BIO *out, const EVP_PKEY *pkey, int indent,
 428                                 const char *kstr)
 429         {
 430         BIO_indent(out, indent, 128);
 431         BIO_printf(out, "%s algorithm \"%s\" unsupported\n",
 432                                                 kstr, OBJ_nid2ln(pkey->type));
 433         return 1;
 434         }
 435
 436 int EVP_PKEY_print_public(BIO *out, const EVP_PKEY *pkey,
 437                                 int indent, ASN1_PCTX *pctx)
 438         {
 439         if (pkey->ameth && pkey->ameth->pub_print)
 440                 return pkey->ameth->pub_print(out, pkey, indent, pctx);
 441
 442         return unsup_alg(out, pkey, indent, "Public Key");
 443         }
 444
 445 int EVP_PKEY_print_private(BIO *out, const EVP_PKEY *pkey,
 446                                 int indent, ASN1_PCTX *pctx)
 447         {
 448         if (pkey->ameth && pkey->ameth->priv_print)
 449                 return pkey->ameth->priv_print(out, pkey, indent, pctx);
 450
 451         return unsup_alg(out, pkey, indent, "Private Key");
 452         }
 453
 454 int EVP_PKEY_print_params(BIO *out, const EVP_PKEY *pkey,
 455                                 int indent, ASN1_PCTX *pctx)
 456         {
 457         if (pkey->ameth && pkey->ameth->param_print)
 458                 return pkey->ameth->param_print(out, pkey, indent, pctx);
 459         return unsup_alg(out, pkey, indent, "Parameters");
 460         }
 461
 462 int EVP_PKEY_get_default_digest_nid(EVP_PKEY *pkey, int *pnid)
 463         {
 464         if (!pkey->ameth || !pkey->ameth->pkey_ctrl)
 465                 return -2;
 466         return pkey->ameth->pkey_ctrl(pkey, ASN1_PKEY_CTRL_DEFAULT_MD_NID,
 467                                                 0, pnid);
 468         }
 469