crypto/asn1/ameth_lib.c

   1 /*
   2  * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
   3  * 2006.
   4  */
   5 /* ====================================================================
   6  * Copyright (c) 2006 The OpenSSL Project.  All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  *
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in
  17  *    the documentation and/or other materials provided with the
  18  *    distribution.
  19  *
  20  * 3. All advertising materials mentioning features or use of this
  21  *    software must display the following acknowledgment:
  22  *    "This product includes software developed by the OpenSSL Project
  23  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  24  *
  25  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  26  *    endorse or promote products derived from this software without
  27  *    prior written permission. For written permission, please contact
  28  *    licensing@OpenSSL.org.
  29  *
  30  * 5. Products derived from this software may not be called "OpenSSL"
  31  *    nor may "OpenSSL" appear in their names without prior written
  32  *    permission of the OpenSSL Project.
  33  *
  34  * 6. Redistributions of any form whatsoever must retain the following
  35  *    acknowledgment:
  36  *    "This product includes software developed by the OpenSSL Project
  37  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  38  *
  39  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  40  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  41  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  42  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  43  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  44  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  45  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  46  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  48  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  49  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  50  * OF THE POSSIBILITY OF SUCH DAMAGE.
  51  * ====================================================================
  52  *
  53  * This product includes cryptographic software written by Eric Young
  54  * (eay@cryptsoft.com).  This product includes software written by Tim
  55  * Hudson (tjh@cryptsoft.com).
  56  *
  57  */
  58
  59 #include <stdio.h>
  60 #include "internal/cryptlib.h"
  61 #include <openssl/asn1t.h>
  62 #include <openssl/x509.h>
  63 #ifndef OPENSSL_NO_ENGINE
  64 # include <openssl/engine.h>
  65 #endif
  66 #include "internal/asn1_int.h"
  67
  68 extern const EVP_PKEY_ASN1_METHOD rsa_asn1_meths[];
  69 extern const EVP_PKEY_ASN1_METHOD dsa_asn1_meths[];
  70 extern const EVP_PKEY_ASN1_METHOD dh_asn1_meth;
  71 extern const EVP_PKEY_ASN1_METHOD dhx_asn1_meth;
  72 extern const EVP_PKEY_ASN1_METHOD eckey_asn1_meth;
  73 extern const EVP_PKEY_ASN1_METHOD hmac_asn1_meth;
  74 extern const EVP_PKEY_ASN1_METHOD cmac_asn1_meth;
  75
  76 /* Keep this sorted in type order !! */
  77 static const EVP_PKEY_ASN1_METHOD *standard_methods[] = {
  78 #ifndef OPENSSL_NO_RSA
  79     &rsa_asn1_meths[0],
  80     &rsa_asn1_meths[1],
  81 #endif
  82 #ifndef OPENSSL_NO_DH
  83     &dh_asn1_meth,
  84 #endif
  85 #ifndef OPENSSL_NO_DSA
  86     &dsa_asn1_meths[0],
  87     &dsa_asn1_meths[1],
  88     &dsa_asn1_meths[2],
  89     &dsa_asn1_meths[3],
  90     &dsa_asn1_meths[4],
  91 #endif
  92 #ifndef OPENSSL_NO_EC
  93     &eckey_asn1_meth,
  94 #endif
  95     &hmac_asn1_meth,
  96     &cmac_asn1_meth,
  97 #ifndef OPENSSL_NO_DH
  98     &dhx_asn1_meth
  99 #endif
 100 };
 101
 102 typedef int sk_cmp_fn_type(const char *const *a, const char *const *b);
 103 DECLARE_STACK_OF(EVP_PKEY_ASN1_METHOD)
 104 static STACK_OF(EVP_PKEY_ASN1_METHOD) *app_methods = NULL;
 105
 106 #ifdef TEST
 107 void main()
 108 {
 109     int i;
 110     for (i = 0; i < OSSL_NELEM(standard_methods); i++)
 111         fprintf(stderr, "Number %d id=%d (%s)\n", i,
 112                 standard_methods[i]->pkey_id,
 113                 OBJ_nid2sn(standard_methods[i]->pkey_id));
 114 }
 115 #endif
 116
 117 DECLARE_OBJ_BSEARCH_CMP_FN(const EVP_PKEY_ASN1_METHOD *,
 118                            const EVP_PKEY_ASN1_METHOD *, ameth);
 119
 120 static int ameth_cmp(const EVP_PKEY_ASN1_METHOD *const *a,
 121                      const EVP_PKEY_ASN1_METHOD *const *b)
 122 {
 123     return ((*a)->pkey_id - (*b)->pkey_id);
 124 }
 125
 126 IMPLEMENT_OBJ_BSEARCH_CMP_FN(const EVP_PKEY_ASN1_METHOD *,
 127                              const EVP_PKEY_ASN1_METHOD *, ameth);
 128
 129 int EVP_PKEY_asn1_get_count(void)
 130 {
 131     int num = OSSL_NELEM(standard_methods);
 132     if (app_methods)
 133         num += sk_EVP_PKEY_ASN1_METHOD_num(app_methods);
 134     return num;
 135 }
 136
 137 const EVP_PKEY_ASN1_METHOD *EVP_PKEY_asn1_get0(int idx)
 138 {
 139     int num = OSSL_NELEM(standard_methods);
 140     if (idx < 0)
 141         return NULL;
 142     if (idx < num)
 143         return standard_methods[idx];
 144     idx -= num;
 145     return sk_EVP_PKEY_ASN1_METHOD_value(app_methods, idx);
 146 }
 147
 148 static const EVP_PKEY_ASN1_METHOD *pkey_asn1_find(int type)
 149 {
 150     EVP_PKEY_ASN1_METHOD tmp;
 151     const EVP_PKEY_ASN1_METHOD *t = &tmp, **ret;
 152     tmp.pkey_id = type;
 153     if (app_methods) {
 154         int idx;
 155         idx = sk_EVP_PKEY_ASN1_METHOD_find(app_methods, &tmp);
 156         if (idx >= 0)
 157             return sk_EVP_PKEY_ASN1_METHOD_value(app_methods, idx);
 158     }
 159     ret = OBJ_bsearch_ameth(&t, standard_methods, OSSL_NELEM(standard_methods));
 160     if (!ret || !*ret)
 161         return NULL;
 162     return *ret;
 163 }
 164
 165 /*
 166  * Find an implementation of an ASN1 algorithm. If 'pe' is not NULL also
 167  * search through engines and set *pe to a functional reference to the engine
 168  * implementing 'type' or NULL if no engine implements it.
 169  */
 170
 171 const EVP_PKEY_ASN1_METHOD *EVP_PKEY_asn1_find(ENGINE **pe, int type)
 172 {
 173     const EVP_PKEY_ASN1_METHOD *t;
 174
 175     for (;;) {
 176         t = pkey_asn1_find(type);
 177         if (!t || !(t->pkey_flags & ASN1_PKEY_ALIAS))
 178             break;
 179         type = t->pkey_base_id;
 180     }
 181     if (pe) {
 182 #ifndef OPENSSL_NO_ENGINE
 183         ENGINE *e;
 184         /* type will contain the final unaliased type */
 185         e = ENGINE_get_pkey_asn1_meth_engine(type);
 186         if (e) {
 187             *pe = e;
 188             return ENGINE_get_pkey_asn1_meth(e, type);
 189         }
 190 #endif
 191         *pe = NULL;
 192     }
 193     return t;
 194 }
 195
 196 const EVP_PKEY_ASN1_METHOD *EVP_PKEY_asn1_find_str(ENGINE **pe,
 197                                                    const char *str, int len)
 198 {
 199     int i;
 200     const EVP_PKEY_ASN1_METHOD *ameth;
 201     if (len == -1)
 202         len = strlen(str);
 203     if (pe) {
 204 #ifndef OPENSSL_NO_ENGINE
 205         ENGINE *e;
 206         ameth = ENGINE_pkey_asn1_find_str(&e, str, len);
 207         if (ameth) {
 208             /*
 209              * Convert structural into functional reference
 210              */
 211             if (!ENGINE_init(e))
 212                 ameth = NULL;
 213             ENGINE_free(e);
 214             *pe = e;
 215             return ameth;
 216         }
 217 #endif
 218         *pe = NULL;
 219     }
 220     for (i = 0; i < EVP_PKEY_asn1_get_count(); i++) {
 221         ameth = EVP_PKEY_asn1_get0(i);
 222         if (ameth->pkey_flags & ASN1_PKEY_ALIAS)
 223             continue;
 224         if (((int)strlen(ameth->pem_str) == len)
 225             && (strncasecmp(ameth->pem_str, str, len) == 0))
 226             return ameth;
 227     }
 228     return NULL;
 229 }
 230
 231 int EVP_PKEY_asn1_add0(const EVP_PKEY_ASN1_METHOD *ameth)
 232 {
 233     if (app_methods == NULL) {
 234         app_methods = sk_EVP_PKEY_ASN1_METHOD_new(ameth_cmp);
 235         if (!app_methods)
 236             return 0;
 237     }
 238     if (!sk_EVP_PKEY_ASN1_METHOD_push(app_methods, ameth))
 239         return 0;
 240     sk_EVP_PKEY_ASN1_METHOD_sort(app_methods);
 241     return 1;
 242 }
 243
 244 int EVP_PKEY_asn1_add_alias(int to, int from)
 245 {
 246     EVP_PKEY_ASN1_METHOD *ameth;
 247     ameth = EVP_PKEY_asn1_new(from, ASN1_PKEY_ALIAS, NULL, NULL);
 248     if (!ameth)
 249         return 0;
 250     ameth->pkey_base_id = to;
 251     if (!EVP_PKEY_asn1_add0(ameth)) {
 252         EVP_PKEY_asn1_free(ameth);
 253         return 0;
 254     }
 255     return 1;
 256 }
 257
 258 int EVP_PKEY_asn1_get0_info(int *ppkey_id, int *ppkey_base_id,
 259                             int *ppkey_flags, const char **pinfo,
 260                             const char **ppem_str,
 261                             const EVP_PKEY_ASN1_METHOD *ameth)
 262 {
 263     if (!ameth)
 264         return 0;
 265     if (ppkey_id)
 266         *ppkey_id = ameth->pkey_id;
 267     if (ppkey_base_id)
 268         *ppkey_base_id = ameth->pkey_base_id;
 269     if (ppkey_flags)
 270         *ppkey_flags = ameth->pkey_flags;
 271     if (pinfo)
 272         *pinfo = ameth->info;
 273     if (ppem_str)
 274         *ppem_str = ameth->pem_str;
 275     return 1;
 276 }
 277
 278 const EVP_PKEY_ASN1_METHOD *EVP_PKEY_get0_asn1(EVP_PKEY *pkey)
 279 {
 280     return pkey->ameth;
 281 }
 282
 283 EVP_PKEY_ASN1_METHOD *EVP_PKEY_asn1_new(int id, int flags,
 284                                         const char *pem_str, const char *info)
 285 {
 286     EVP_PKEY_ASN1_METHOD *ameth = OPENSSL_zalloc(sizeof(*ameth));
 287
 288     if (!ameth)
 289         return NULL;
 290
 291     ameth->pkey_id = id;
 292     ameth->pkey_base_id = id;
 293     ameth->pkey_flags = flags | ASN1_PKEY_DYNAMIC;
 294
 295     if (info) {
 296         ameth->info = BUF_strdup(info);
 297         if (!ameth->info)
 298             goto err;
 299     }
 300
 301     if (pem_str) {
 302         ameth->pem_str = BUF_strdup(pem_str);
 303         if (!ameth->pem_str)
 304             goto err;
 305     }
 306
 307     return ameth;
 308
 309  err:
 310     EVP_PKEY_asn1_free(ameth);
 311     return NULL;
 312
 313 }
 314
 315 void EVP_PKEY_asn1_copy(EVP_PKEY_ASN1_METHOD *dst,
 316                         const EVP_PKEY_ASN1_METHOD *src)
 317 {
 318
 319     dst->pub_decode = src->pub_decode;
 320     dst->pub_encode = src->pub_encode;
 321     dst->pub_cmp = src->pub_cmp;
 322     dst->pub_print = src->pub_print;
 323
 324     dst->priv_decode = src->priv_decode;
 325     dst->priv_encode = src->priv_encode;
 326     dst->priv_print = src->priv_print;
 327
 328     dst->old_priv_encode = src->old_priv_encode;
 329     dst->old_priv_decode = src->old_priv_decode;
 330
 331     dst->pkey_size = src->pkey_size;
 332     dst->pkey_bits = src->pkey_bits;
 333
 334     dst->param_decode = src->param_decode;
 335     dst->param_encode = src->param_encode;
 336     dst->param_missing = src->param_missing;
 337     dst->param_copy = src->param_copy;
 338     dst->param_cmp = src->param_cmp;
 339     dst->param_print = src->param_print;
 340
 341     dst->pkey_free = src->pkey_free;
 342     dst->pkey_ctrl = src->pkey_ctrl;
 343
 344     dst->item_sign = src->item_sign;
 345     dst->item_verify = src->item_verify;
 346
 347 }
 348
 349 void EVP_PKEY_asn1_free(EVP_PKEY_ASN1_METHOD *ameth)
 350 {
 351     if (ameth && (ameth->pkey_flags & ASN1_PKEY_DYNAMIC)) {
 352         OPENSSL_free(ameth->pem_str);
 353         OPENSSL_free(ameth->info);
 354         OPENSSL_free(ameth);
 355     }
 356 }
 357
 358 void EVP_PKEY_asn1_set_public(EVP_PKEY_ASN1_METHOD *ameth,
 359                               int (*pub_decode) (EVP_PKEY *pk,
 360                                                  X509_PUBKEY *pub),
 361                               int (*pub_encode) (X509_PUBKEY *pub,
 362                                                  const EVP_PKEY *pk),
 363                               int (*pub_cmp) (const EVP_PKEY *a,
 364                                               const EVP_PKEY *b),
 365                               int (*pub_print) (BIO *out,
 366                                                 const EVP_PKEY *pkey,
 367                                                 int indent, ASN1_PCTX *pctx),
 368                               int (*pkey_size) (const EVP_PKEY *pk),
 369                               int (*pkey_bits) (const EVP_PKEY *pk))
 370 {
 371     ameth->pub_decode = pub_decode;
 372     ameth->pub_encode = pub_encode;
 373     ameth->pub_cmp = pub_cmp;
 374     ameth->pub_print = pub_print;
 375     ameth->pkey_size = pkey_size;
 376     ameth->pkey_bits = pkey_bits;
 377 }
 378
 379 void EVP_PKEY_asn1_set_private(EVP_PKEY_ASN1_METHOD *ameth,
 380                                int (*priv_decode) (EVP_PKEY *pk,
 381                                                    PKCS8_PRIV_KEY_INFO
 382                                                    *p8inf),
 383                                int (*priv_encode) (PKCS8_PRIV_KEY_INFO *p8,
 384                                                    const EVP_PKEY *pk),
 385                                int (*priv_print) (BIO *out,
 386                                                   const EVP_PKEY *pkey,
 387                                                   int indent,
 388                                                   ASN1_PCTX *pctx))
 389 {
 390     ameth->priv_decode = priv_decode;
 391     ameth->priv_encode = priv_encode;
 392     ameth->priv_print = priv_print;
 393 }
 394
 395 void EVP_PKEY_asn1_set_param(EVP_PKEY_ASN1_METHOD *ameth,
 396                              int (*param_decode) (EVP_PKEY *pkey,
 397                                                   const unsigned char **pder,
 398                                                   int derlen),
 399                              int (*param_encode) (const EVP_PKEY *pkey,
 400                                                   unsigned char **pder),
 401                              int (*param_missing) (const EVP_PKEY *pk),
 402                              int (*param_copy) (EVP_PKEY *to,
 403                                                 const EVP_PKEY *from),
 404                              int (*param_cmp) (const EVP_PKEY *a,
 405                                                const EVP_PKEY *b),
 406                              int (*param_print) (BIO *out,
 407                                                  const EVP_PKEY *pkey,
 408                                                  int indent, ASN1_PCTX *pctx))
 409 {
 410     ameth->param_decode = param_decode;
 411     ameth->param_encode = param_encode;
 412     ameth->param_missing = param_missing;
 413     ameth->param_copy = param_copy;
 414     ameth->param_cmp = param_cmp;
 415     ameth->param_print = param_print;
 416 }
 417
 418 void EVP_PKEY_asn1_set_free(EVP_PKEY_ASN1_METHOD *ameth,
 419                             void (*pkey_free) (EVP_PKEY *pkey))
 420 {
 421     ameth->pkey_free = pkey_free;
 422 }
 423
 424 void EVP_PKEY_asn1_set_ctrl(EVP_PKEY_ASN1_METHOD *ameth,
 425                             int (*pkey_ctrl) (EVP_PKEY *pkey, int op,
 426                                               long arg1, void *arg2))
 427 {
 428     ameth->pkey_ctrl = pkey_ctrl;
 429 }
 430
 431 void EVP_PKEY_asn1_set_security_bits(EVP_PKEY_ASN1_METHOD *ameth,
 432                                      int (*pkey_security_bits) (const EVP_PKEY
 433                                                                 *pk))
 434 {
 435     ameth->pkey_security_bits = pkey_security_bits;
 436 }
 437
 438 void EVP_PKEY_asn1_set_item(EVP_PKEY_ASN1_METHOD *ameth,
 439                             int (*item_verify) (EVP_MD_CTX *ctx,
 440                                                 const ASN1_ITEM *it,
 441                                                 void *asn,
 442                                                 X509_ALGOR *a,
 443                                                 ASN1_BIT_STRING *sig,
 444                                                 EVP_PKEY *pkey),
 445                             int (*item_sign) (EVP_MD_CTX *ctx,
 446                                               const ASN1_ITEM *it,
 447                                               void *asn,
 448                                               X509_ALGOR *alg1,
 449                                               X509_ALGOR *alg2,
 450                                               ASN1_BIT_STRING *sig))
 451 {
 452     ameth->item_sign = item_sign;
 453     ameth->item_verify = item_verify;
 454 }