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_security_bits(const EVP_PKEY *pkey)
  93 {
  94     if (pkey == NULL)
  95         return 0;
  96     if (!pkey->ameth || !pkey->ameth->pkey_security_bits)
  97         return -2;
  98     return pkey->ameth->pkey_security_bits(pkey);
  99 }
 100
 101 int EVP_PKEY_size(EVP_PKEY *pkey)
 102 {
 103     if (pkey && pkey->ameth && pkey->ameth->pkey_size)
 104         return pkey->ameth->pkey_size(pkey);
 105     return 0;
 106 }
 107
 108 int EVP_PKEY_save_parameters(EVP_PKEY *pkey, int mode)
 109 {
 110 #ifndef OPENSSL_NO_DSA
 111     if (pkey->type == EVP_PKEY_DSA) {
 112         int ret = pkey->save_parameters;
 113
 114         if (mode >= 0)
 115             pkey->save_parameters = mode;
 116         return (ret);
 117     }
 118 #endif
 119 #ifndef OPENSSL_NO_EC
 120     if (pkey->type == EVP_PKEY_EC) {
 121         int ret = pkey->save_parameters;
 122
 123         if (mode >= 0)
 124             pkey->save_parameters = mode;
 125         return (ret);
 126     }
 127 #endif
 128     return (0);
 129 }
 130
 131 int EVP_PKEY_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from)
 132 {
 133     if (to->type != from->type) {
 134         EVPerr(EVP_F_EVP_PKEY_COPY_PARAMETERS, EVP_R_DIFFERENT_KEY_TYPES);
 135         goto err;
 136     }
 137
 138     if (EVP_PKEY_missing_parameters(from)) {
 139         EVPerr(EVP_F_EVP_PKEY_COPY_PARAMETERS, EVP_R_MISSING_PARAMETERS);
 140         goto err;
 141     }
 142     if (from->ameth && from->ameth->param_copy)
 143         return from->ameth->param_copy(to, from);
 144  err:
 145     return 0;
 146 }
 147
 148 int EVP_PKEY_missing_parameters(const EVP_PKEY *pkey)
 149 {
 150     if (pkey->ameth && pkey->ameth->param_missing)
 151         return pkey->ameth->param_missing(pkey);
 152     return 0;
 153 }
 154
 155 int EVP_PKEY_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b)
 156 {
 157     if (a->type != b->type)
 158         return -1;
 159     if (a->ameth && a->ameth->param_cmp)
 160         return a->ameth->param_cmp(a, b);
 161     return -2;
 162 }
 163
 164 int EVP_PKEY_cmp(const EVP_PKEY *a, const EVP_PKEY *b)
 165 {
 166     if (a->type != b->type)
 167         return -1;
 168
 169     if (a->ameth) {
 170         int ret;
 171         /* Compare parameters if the algorithm has them */
 172         if (a->ameth->param_cmp) {
 173             ret = a->ameth->param_cmp(a, b);
 174             if (ret <= 0)
 175                 return ret;
 176         }
 177
 178         if (a->ameth->pub_cmp)
 179             return a->ameth->pub_cmp(a, b);
 180     }
 181
 182     return -2;
 183 }
 184
 185 EVP_PKEY *EVP_PKEY_new(void)
 186 {
 187     EVP_PKEY *ret;
 188
 189     ret = (EVP_PKEY *)OPENSSL_malloc(sizeof(EVP_PKEY));
 190     if (ret == NULL) {
 191         EVPerr(EVP_F_EVP_PKEY_NEW, ERR_R_MALLOC_FAILURE);
 192         return (NULL);
 193     }
 194     ret->type = EVP_PKEY_NONE;
 195     ret->save_type = EVP_PKEY_NONE;
 196     ret->references = 1;
 197     ret->ameth = NULL;
 198     ret->engine = NULL;
 199     ret->pkey.ptr = NULL;
 200     ret->attributes = NULL;
 201     ret->save_parameters = 1;
 202     return (ret);
 203 }
 204
 205 /*
 206  * Setup a public key ASN1 method and ENGINE from a NID or a string. If pkey
 207  * is NULL just return 1 or 0 if the algorithm exists.
 208  */
 209
 210 static int pkey_set_type(EVP_PKEY *pkey, int type, const char *str, int len)
 211 {
 212     const EVP_PKEY_ASN1_METHOD *ameth;
 213     ENGINE *e = NULL;
 214     if (pkey) {
 215         if (pkey->pkey.ptr)
 216             EVP_PKEY_free_it(pkey);
 217         /*
 218          * If key type matches and a method exists then this lookup has
 219          * succeeded once so just indicate success.
 220          */
 221         if ((type == pkey->save_type) && pkey->ameth)
 222             return 1;
 223 #ifndef OPENSSL_NO_ENGINE
 224         /* If we have an ENGINE release it */
 225         if (pkey->engine) {
 226             ENGINE_finish(pkey->engine);
 227             pkey->engine = NULL;
 228         }
 229 #endif
 230     }
 231     if (str)
 232         ameth = EVP_PKEY_asn1_find_str(&e, str, len);
 233     else
 234         ameth = EVP_PKEY_asn1_find(&e, type);
 235 #ifndef OPENSSL_NO_ENGINE
 236     if (!pkey && e)
 237         ENGINE_finish(e);
 238 #endif
 239     if (!ameth) {
 240         EVPerr(EVP_F_PKEY_SET_TYPE, EVP_R_UNSUPPORTED_ALGORITHM);
 241         return 0;
 242     }
 243     if (pkey) {
 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         EVPerr(EVP_F_EVP_PKEY_GET1_EC_KEY, EVP_R_EXPECTING_A_EC_KEY);
 330         return NULL;
 331     }
 332     EC_KEY_up_ref(pkey->pkey.ec);
 333     return pkey->pkey.ec;
 334 }
 335 #endif
 336
 337 #ifndef OPENSSL_NO_DH
 338
 339 int EVP_PKEY_set1_DH(EVP_PKEY *pkey, DH *key)
 340 {
 341     int ret = EVP_PKEY_assign_DH(pkey, key);
 342     if (ret)
 343         DH_up_ref(key);
 344     return ret;
 345 }
 346
 347 DH *EVP_PKEY_get1_DH(EVP_PKEY *pkey)
 348 {
 349     if (pkey->type != EVP_PKEY_DH && pkey->type != EVP_PKEY_DHX) {
 350         EVPerr(EVP_F_EVP_PKEY_GET1_DH, EVP_R_EXPECTING_A_DH_KEY);
 351         return NULL;
 352     }
 353     DH_up_ref(pkey->pkey.dh);
 354     return pkey->pkey.dh;
 355 }
 356 #endif
 357
 358 int EVP_PKEY_type(int type)
 359 {
 360     int ret;
 361     const EVP_PKEY_ASN1_METHOD *ameth;
 362     ENGINE *e;
 363     ameth = EVP_PKEY_asn1_find(&e, type);
 364     if (ameth)
 365         ret = ameth->pkey_id;
 366     else
 367         ret = NID_undef;
 368 #ifndef OPENSSL_NO_ENGINE
 369     if (e)
 370         ENGINE_finish(e);
 371 #endif
 372     return ret;
 373 }
 374
 375 int EVP_PKEY_id(const EVP_PKEY *pkey)
 376 {
 377     return pkey->type;
 378 }
 379
 380 int EVP_PKEY_base_id(const EVP_PKEY *pkey)
 381 {
 382     return EVP_PKEY_type(pkey->type);
 383 }
 384
 385 void EVP_PKEY_free(EVP_PKEY *x)
 386 {
 387     int i;
 388
 389     if (x == NULL)
 390         return;
 391
 392     i = CRYPTO_add(&x->references, -1, CRYPTO_LOCK_EVP_PKEY);
 393 #ifdef REF_PRINT
 394     REF_PRINT("EVP_PKEY", x);
 395 #endif
 396     if (i > 0)
 397         return;
 398 #ifdef REF_CHECK
 399     if (i < 0) {
 400         fprintf(stderr, "EVP_PKEY_free, bad reference count\n");
 401         abort();
 402     }
 403 #endif
 404     EVP_PKEY_free_it(x);
 405     if (x->attributes)
 406         sk_X509_ATTRIBUTE_pop_free(x->attributes, X509_ATTRIBUTE_free);
 407     OPENSSL_free(x);
 408 }
 409
 410 static void EVP_PKEY_free_it(EVP_PKEY *x)
 411 {
 412     if (x->ameth && x->ameth->pkey_free) {
 413         x->ameth->pkey_free(x);
 414         x->pkey.ptr = NULL;
 415     }
 416 #ifndef OPENSSL_NO_ENGINE
 417     if (x->engine) {
 418         ENGINE_finish(x->engine);
 419         x->engine = NULL;
 420     }
 421 #endif
 422 }
 423
 424 static int unsup_alg(BIO *out, const EVP_PKEY *pkey, int indent,
 425                      const char *kstr)
 426 {
 427     BIO_indent(out, indent, 128);
 428     BIO_printf(out, "%s algorithm \"%s\" unsupported\n",
 429                kstr, OBJ_nid2ln(pkey->type));
 430     return 1;
 431 }
 432
 433 int EVP_PKEY_print_public(BIO *out, const EVP_PKEY *pkey,
 434                           int indent, ASN1_PCTX *pctx)
 435 {
 436     if (pkey->ameth && pkey->ameth->pub_print)
 437         return pkey->ameth->pub_print(out, pkey, indent, pctx);
 438
 439     return unsup_alg(out, pkey, indent, "Public Key");
 440 }
 441
 442 int EVP_PKEY_print_private(BIO *out, const EVP_PKEY *pkey,
 443                            int indent, ASN1_PCTX *pctx)
 444 {
 445     if (pkey->ameth && pkey->ameth->priv_print)
 446         return pkey->ameth->priv_print(out, pkey, indent, pctx);
 447
 448     return unsup_alg(out, pkey, indent, "Private Key");
 449 }
 450
 451 int EVP_PKEY_print_params(BIO *out, const EVP_PKEY *pkey,
 452                           int indent, ASN1_PCTX *pctx)
 453 {
 454     if (pkey->ameth && pkey->ameth->param_print)
 455         return pkey->ameth->param_print(out, pkey, indent, pctx);
 456     return unsup_alg(out, pkey, indent, "Parameters");
 457 }
 458
 459 int EVP_PKEY_get_default_digest_nid(EVP_PKEY *pkey, int *pnid)
 460 {
 461     if (!pkey->ameth || !pkey->ameth->pkey_ctrl)
 462         return -2;
 463     return pkey->ameth->pkey_ctrl(pkey, ASN1_PKEY_CTRL_DEFAULT_MD_NID,
 464                                   0, pnid);
 465 }