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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/ec_key.h>
     21 #include <openssl/err.h>
     22 #include <openssl/mem.h>
     23 #include <openssl/rsa.h>
     24 #include <openssl/thread.h>
     25 
     26 #include "../internal.h"
     27 
     28 
     29 struct engine_st {
     30   RSA_METHOD *rsa_method;
     31   ECDSA_METHOD *ecdsa_method;
     32 };
     33 
     34 ENGINE *ENGINE_new(void) {
     35   ENGINE *engine = OPENSSL_malloc(sizeof(ENGINE));
     36   if (engine == NULL) {
     37     return NULL;
     38   }
     39 
     40   OPENSSL_memset(engine, 0, sizeof(ENGINE));
     41   return engine;
     42 }
     43 
     44 void ENGINE_free(ENGINE *engine) {
     45   // Methods are currently required to be static so are not unref'ed.
     46   OPENSSL_free(engine);
     47 }
     48 
     49 // set_method takes a pointer to a method and its given size and sets
     50 // |*out_member| to point to it. This function might want to be extended in the
     51 // future to support making a copy of the method so that a stable ABI for
     52 // ENGINEs can be supported. But, for the moment, all *_METHODS must be
     53 // static.
     54 static int set_method(void **out_member, const void *method, size_t method_size,
     55                       size_t compiled_size) {
     56   const struct openssl_method_common_st *common = method;
     57   if (method_size != compiled_size || !common->is_static) {
     58     return 0;
     59   }
     60 
     61   *out_member = (void*) method;
     62   return 1;
     63 }
     64 
     65 int ENGINE_set_RSA_method(ENGINE *engine, const RSA_METHOD *method,
     66                          size_t method_size) {
     67   return set_method((void **)&engine->rsa_method, method, method_size,
     68                     sizeof(RSA_METHOD));
     69 }
     70 
     71 RSA_METHOD *ENGINE_get_RSA_method(const ENGINE *engine) {
     72   return engine->rsa_method;
     73 }
     74 
     75 int ENGINE_set_ECDSA_method(ENGINE *engine, const ECDSA_METHOD *method,
     76                             size_t method_size) {
     77   return set_method((void **)&engine->ecdsa_method, method, method_size,
     78                     sizeof(ECDSA_METHOD));
     79 }
     80 
     81 ECDSA_METHOD *ENGINE_get_ECDSA_method(const ENGINE *engine) {
     82   return engine->ecdsa_method;
     83 }
     84 
     85 void METHOD_ref(void *method_in) {
     86   assert(((struct openssl_method_common_st*) method_in)->is_static);
     87 }
     88 
     89 void METHOD_unref(void *method_in) {
     90   struct openssl_method_common_st *method = method_in;
     91 
     92   if (method == NULL) {
     93     return;
     94   }
     95   assert(method->is_static);
     96 }
     97 
     98 OPENSSL_DECLARE_ERROR_REASON(ENGINE, OPERATION_NOT_SUPPORTED)
     99