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      1 /* Copyright (c) 2014, Google Inc.
      2  *
      3  * Permission to use, copy, modify, and/or distribute this software for any
      4  * purpose with or without fee is hereby granted, provided that the above
      5  * copyright notice and this permission notice appear in all copies.
      6  *
      7  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
      8  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
      9  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
     10  * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
     11  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
     12  * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
     13  * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
     14 
     15 #include <openssl/engine.h>
     16 
     17 #include <string.h>
     18 #include <assert.h>
     19 
     20 #include <openssl/dh.h>
     21 #include <openssl/dsa.h>
     22 #include <openssl/ec_key.h>
     23 #include <openssl/err.h>
     24 #include <openssl/mem.h>
     25 #include <openssl/rsa.h>
     26 #include <openssl/thread.h>
     27 
     28 
     29 struct engine_st {
     30   DH_METHOD *dh_method;
     31   DSA_METHOD *dsa_method;
     32   RSA_METHOD *rsa_method;
     33   ECDSA_METHOD *ecdsa_method;
     34 };
     35 
     36 ENGINE *ENGINE_new(void) {
     37   ENGINE *engine = OPENSSL_malloc(sizeof(ENGINE));
     38   if (engine == NULL) {
     39     return NULL;
     40   }
     41 
     42   memset(engine, 0, sizeof(ENGINE));
     43   return engine;
     44 }
     45 
     46 void ENGINE_free(ENGINE *engine) {
     47   /* Methods are currently required to be static so are not unref'ed. */
     48   OPENSSL_free(engine);
     49 }
     50 
     51 /* set_method takes a pointer to a method and its given size and sets
     52  * |*out_member| to point to it. This function might want to be extended in the
     53  * future to support making a copy of the method so that a stable ABI for
     54  * ENGINEs can be supported. But, for the moment, all *_METHODS must be
     55  * static. */
     56 static int set_method(void **out_member, const void *method, size_t method_size,
     57                       size_t compiled_size) {
     58   const struct openssl_method_common_st *common = method;
     59   if (method_size != compiled_size || !common->is_static) {
     60     return 0;
     61   }
     62 
     63   *out_member = (void*) method;
     64   return 1;
     65 }
     66 
     67 int ENGINE_set_DH_method(ENGINE *engine, const DH_METHOD *method,
     68                          size_t method_size) {
     69   return set_method((void **)&engine->dh_method, method, method_size,
     70                     sizeof(DH_METHOD));
     71 }
     72 
     73 DH_METHOD *ENGINE_get_DH_method(const ENGINE *engine) {
     74   return engine->dh_method;
     75 }
     76 
     77 int ENGINE_set_DSA_method(ENGINE *engine, const DSA_METHOD *method,
     78                          size_t method_size) {
     79   return set_method((void **)&engine->dsa_method, method, method_size,
     80                     sizeof(DSA_METHOD));
     81 }
     82 
     83 DSA_METHOD *ENGINE_get_DSA_method(const ENGINE *engine) {
     84   return engine->dsa_method;
     85 }
     86 
     87 int ENGINE_set_RSA_method(ENGINE *engine, const RSA_METHOD *method,
     88                          size_t method_size) {
     89   return set_method((void **)&engine->rsa_method, method, method_size,
     90                     sizeof(RSA_METHOD));
     91 }
     92 
     93 RSA_METHOD *ENGINE_get_RSA_method(const ENGINE *engine) {
     94   return engine->rsa_method;
     95 }
     96 
     97 int ENGINE_set_ECDSA_method(ENGINE *engine, const ECDSA_METHOD *method,
     98                             size_t method_size) {
     99   return set_method((void **)&engine->ecdsa_method, method, method_size,
    100                     sizeof(ECDSA_METHOD));
    101 }
    102 
    103 ECDSA_METHOD *ENGINE_get_ECDSA_method(const ENGINE *engine) {
    104   return engine->ecdsa_method;
    105 }
    106 
    107 void METHOD_ref(void *method_in) {
    108   assert(((struct openssl_method_common_st*) method_in)->is_static);
    109 }
    110 
    111 void METHOD_unref(void *method_in) {
    112   struct openssl_method_common_st *method = method_in;
    113 
    114   if (method == NULL) {
    115     return;
    116   }
    117   assert(method->is_static);
    118 }
    119 
    120 OPENSSL_DECLARE_ERROR_REASON(ENGINE, OPERATION_NOT_SUPPORTED);
    121