1 /* crypto/engine/engine_list.c */
2 /* Written by Geoff Thorpe (geoff@geoffthorpe.net) for the OpenSSL
5 /* ====================================================================
6 * Copyright (c) 1999 The OpenSSL Project. All rights reserved.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
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
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/)"
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.
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.
34 * 6. Redistributions of any form whatsoever must retain the following
36 * "This product includes software developed by the OpenSSL Project
37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
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 * ====================================================================
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).
59 #include <openssl/crypto.h>
61 #include "engine_int.h"
62 #include <openssl/engine.h>
64 /* The linked-list of pointers to engine types. engine_list_head
65 * incorporates an implicit structural reference but engine_list_tail
66 * does not - the latter is a computational niceity and only points
67 * to something that is already pointed to by its predecessor in the
68 * list (or engine_list_head itself). In the same way, the use of the
69 * "prev" pointer in each ENGINE is to save excessive list iteration,
70 * it doesn't correspond to an extra structural reference. Hence,
71 * engine_list_head, and each non-null "next" pointer account for
72 * the list itself assuming exactly 1 structural reference on each
74 static ENGINE *engine_list_head = NULL;
75 static ENGINE *engine_list_tail = NULL;
76 /* A boolean switch, used to ensure we only initialise once. This
77 * is needed because the engine list may genuinely become empty during
78 * use (so we can't use engine_list_head as an indicator for example. */
79 static int engine_list_flag = 0;
81 /* These static functions starting with a lower case "engine_" always
82 * take place when CRYPTO_LOCK_ENGINE has been locked up. */
83 static int engine_list_add(ENGINE *e)
86 ENGINE *iterator = NULL;
90 ENGINEerr(ENGINE_F_ENGINE_LIST_ADD,
91 ERR_R_PASSED_NULL_PARAMETER);
94 iterator = engine_list_head;
95 while(iterator && !conflict)
97 conflict = (strcmp(iterator->id, e->id) == 0);
98 iterator = iterator->next;
102 ENGINEerr(ENGINE_F_ENGINE_LIST_ADD,
103 ENGINE_R_CONFLICTING_ENGINE_ID);
106 if(engine_list_head == NULL)
108 /* We are adding to an empty list. */
111 ENGINEerr(ENGINE_F_ENGINE_LIST_ADD,
112 ENGINE_R_INTERNAL_LIST_ERROR);
115 engine_list_head = e;
120 /* We are adding to the tail of an existing list. */
121 if((engine_list_tail == NULL) ||
122 (engine_list_tail->next != NULL))
124 ENGINEerr(ENGINE_F_ENGINE_LIST_ADD,
125 ENGINE_R_INTERNAL_LIST_ERROR);
128 engine_list_tail->next = e;
129 e->prev = engine_list_tail;
131 /* Having the engine in the list assumes a structural
134 /* However it came to be, e is the last item in the list. */
135 engine_list_tail = e;
140 static int engine_list_remove(ENGINE *e)
146 ENGINEerr(ENGINE_F_ENGINE_LIST_REMOVE,
147 ERR_R_PASSED_NULL_PARAMETER);
150 /* We need to check that e is in our linked list! */
151 iterator = engine_list_head;
152 while(iterator && (iterator != e))
153 iterator = iterator->next;
156 ENGINEerr(ENGINE_F_ENGINE_LIST_REMOVE,
157 ENGINE_R_ENGINE_IS_NOT_IN_LIST);
160 /* un-link e from the chain. */
162 e->next->prev = e->prev;
164 e->prev->next = e->next;
165 /* Correct our head/tail if necessary. */
166 if(engine_list_head == e)
167 engine_list_head = e->next;
168 if(engine_list_tail == e)
169 engine_list_tail = e->prev;
170 /* remove our structural reference. */
175 /* This check always takes place with CRYPTO_LOCK_ENGINE locked up
176 * so we're synchronised, but we can't call anything that tries to
177 * lock it again! :-) NB: For convenience (and code-clarity) we
178 * don't output errors for failures of the engine_list_add function
179 * as it will generate errors itself. */
180 static int engine_internal_check(void)
184 /* This is our first time up, we need to populate the list
185 * with our statically compiled-in engines. */
186 if(!engine_list_add(ENGINE_openssl()))
188 engine_list_flag = 1;
192 /* Get the first/last "ENGINE" type available. */
193 ENGINE *ENGINE_get_first(void)
197 CRYPTO_r_lock(CRYPTO_LOCK_ENGINE);
198 if(engine_internal_check())
200 ret = engine_list_head;
204 CRYPTO_r_unlock(CRYPTO_LOCK_ENGINE);
207 ENGINE *ENGINE_get_last(void)
211 CRYPTO_r_lock(CRYPTO_LOCK_ENGINE);
212 if(engine_internal_check())
214 ret = engine_list_tail;
218 CRYPTO_r_unlock(CRYPTO_LOCK_ENGINE);
222 /* Iterate to the next/previous "ENGINE" type (NULL = end of the list). */
223 ENGINE *ENGINE_get_next(ENGINE *e)
228 ENGINEerr(ENGINE_F_ENGINE_GET_NEXT,
229 ERR_R_PASSED_NULL_PARAMETER);
232 CRYPTO_r_lock(CRYPTO_LOCK_ENGINE);
235 /* Return a valid structural refernce to the next ENGINE */
237 CRYPTO_r_unlock(CRYPTO_LOCK_ENGINE);
238 /* Release the structural reference to the previous ENGINE */
242 ENGINE *ENGINE_get_prev(ENGINE *e)
247 ENGINEerr(ENGINE_F_ENGINE_GET_PREV,
248 ERR_R_PASSED_NULL_PARAMETER);
251 CRYPTO_r_lock(CRYPTO_LOCK_ENGINE);
254 /* Return a valid structural reference to the next ENGINE */
256 CRYPTO_r_unlock(CRYPTO_LOCK_ENGINE);
257 /* Release the structural reference to the previous ENGINE */
262 /* Add another "ENGINE" type into the list. */
263 int ENGINE_add(ENGINE *e)
268 ENGINEerr(ENGINE_F_ENGINE_ADD,
269 ERR_R_PASSED_NULL_PARAMETER);
272 if((e->id == NULL) || (e->name == NULL))
274 ENGINEerr(ENGINE_F_ENGINE_ADD,
275 ENGINE_R_ID_OR_NAME_MISSING);
277 CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
278 if(!engine_internal_check() || !engine_list_add(e))
280 ENGINEerr(ENGINE_F_ENGINE_ADD,
281 ENGINE_R_INTERNAL_LIST_ERROR);
284 CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
288 /* Remove an existing "ENGINE" type from the array. */
289 int ENGINE_remove(ENGINE *e)
294 ENGINEerr(ENGINE_F_ENGINE_REMOVE,
295 ERR_R_PASSED_NULL_PARAMETER);
298 CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
299 if(!engine_internal_check() || !engine_list_remove(e))
301 ENGINEerr(ENGINE_F_ENGINE_REMOVE,
302 ENGINE_R_INTERNAL_LIST_ERROR);
305 CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
309 ENGINE *ENGINE_by_id(const char *id)
311 ENGINE *iterator = NULL;
314 ENGINEerr(ENGINE_F_ENGINE_BY_ID,
315 ERR_R_PASSED_NULL_PARAMETER);
318 CRYPTO_r_lock(CRYPTO_LOCK_ENGINE);
319 if(!engine_internal_check())
320 ENGINEerr(ENGINE_F_ENGINE_BY_ID,
321 ENGINE_R_INTERNAL_LIST_ERROR);
324 iterator = engine_list_head;
325 while(iterator && (strcmp(id, iterator->id) != 0))
326 iterator = iterator->next;
328 /* We need to return a structural reference */
329 iterator->struct_ref++;
331 CRYPTO_r_unlock(CRYPTO_LOCK_ENGINE);
333 ENGINEerr(ENGINE_F_ENGINE_BY_ID,
334 ENGINE_R_NO_SUCH_ENGINE);
338 ENGINE *ENGINE_new(void)
342 ret = (ENGINE *)OPENSSL_malloc(sizeof(ENGINE));
345 ENGINEerr(ENGINE_F_ENGINE_NEW, ERR_R_MALLOC_FAILURE);
348 memset(ret, 0, sizeof(ENGINE));
349 ret->flags = ENGINE_FLAGS_MALLOCED;
354 int ENGINE_free(ENGINE *e)
360 ENGINEerr(ENGINE_F_ENGINE_FREE,
361 ERR_R_PASSED_NULL_PARAMETER);
364 i = CRYPTO_add(&e->struct_ref,-1,CRYPTO_LOCK_ENGINE);
366 REF_PRINT("ENGINE",e);
372 fprintf(stderr,"ENGINE_free, bad reference count\n");
376 if(e->flags & ENGINE_FLAGS_MALLOCED)
381 int ENGINE_set_id(ENGINE *e, const char *id)
383 if((e == NULL) || (id == NULL))
385 ENGINEerr(ENGINE_F_ENGINE_SET_ID,
386 ERR_R_PASSED_NULL_PARAMETER);
393 int ENGINE_set_name(ENGINE *e, const char *name)
395 if((e == NULL) || (name == NULL))
397 ENGINEerr(ENGINE_F_ENGINE_SET_NAME,
398 ERR_R_PASSED_NULL_PARAMETER);
405 int ENGINE_set_RSA(ENGINE *e, const RSA_METHOD *rsa_meth)
407 if((e == NULL) || (rsa_meth == NULL))
409 ENGINEerr(ENGINE_F_ENGINE_SET_RSA,
410 ERR_R_PASSED_NULL_PARAMETER);
413 e->rsa_meth = rsa_meth;
417 int ENGINE_set_DSA(ENGINE *e, const DSA_METHOD *dsa_meth)
419 if((e == NULL) || (dsa_meth == NULL))
421 ENGINEerr(ENGINE_F_ENGINE_SET_DSA,
422 ERR_R_PASSED_NULL_PARAMETER);
425 e->dsa_meth = dsa_meth;
429 int ENGINE_set_DH(ENGINE *e, const DH_METHOD *dh_meth)
431 if((e == NULL) || (dh_meth == NULL))
433 ENGINEerr(ENGINE_F_ENGINE_SET_DH,
434 ERR_R_PASSED_NULL_PARAMETER);
437 e->dh_meth = dh_meth;
441 int ENGINE_set_RAND(ENGINE *e, RAND_METHOD *rand_meth)
443 if((e == NULL) || (rand_meth == NULL))
445 ENGINEerr(ENGINE_F_ENGINE_SET_RAND,
446 ERR_R_PASSED_NULL_PARAMETER);
449 e->rand_meth = rand_meth;
453 int ENGINE_set_BN_mod_exp(ENGINE *e, BN_MOD_EXP bn_mod_exp)
455 if((e == NULL) || (bn_mod_exp == NULL))
457 ENGINEerr(ENGINE_F_ENGINE_SET_BN_MOD_EXP,
458 ERR_R_PASSED_NULL_PARAMETER);
461 e->bn_mod_exp = bn_mod_exp;
465 int ENGINE_set_BN_mod_exp_crt(ENGINE *e, BN_MOD_EXP_CRT bn_mod_exp_crt)
467 if((e == NULL) || (bn_mod_exp_crt == NULL))
469 ENGINEerr(ENGINE_F_ENGINE_SET_BN_MOD_EXP_CRT,
470 ERR_R_PASSED_NULL_PARAMETER);
473 e->bn_mod_exp_crt = bn_mod_exp_crt;
477 int ENGINE_set_init_function(ENGINE *e, ENGINE_GEN_INT_FUNC_PTR init_f)
479 if((e == NULL) || (init_f == NULL))
481 ENGINEerr(ENGINE_F_ENGINE_SET_INIT_FUNCTION,
482 ERR_R_PASSED_NULL_PARAMETER);
489 int ENGINE_set_finish_function(ENGINE *e, ENGINE_GEN_INT_FUNC_PTR finish_f)
491 if((e == NULL) || (finish_f == NULL))
493 ENGINEerr(ENGINE_F_ENGINE_SET_FINISH_FUNCTION,
494 ERR_R_PASSED_NULL_PARAMETER);
497 e->finish = finish_f;
501 int ENGINE_set_ctrl_function(ENGINE *e, ENGINE_CTRL_FUNC_PTR ctrl_f)
503 if((e == NULL) || (ctrl_f == NULL))
505 ENGINEerr(ENGINE_F_ENGINE_SET_CTRL_FUNCTION,
506 ERR_R_PASSED_NULL_PARAMETER);
513 const char *ENGINE_get_id(ENGINE *e)
517 ENGINEerr(ENGINE_F_ENGINE_GET_ID,
518 ERR_R_PASSED_NULL_PARAMETER);
524 const char *ENGINE_get_name(ENGINE *e)
528 ENGINEerr(ENGINE_F_ENGINE_GET_NAME,
529 ERR_R_PASSED_NULL_PARAMETER);
535 const RSA_METHOD *ENGINE_get_RSA(ENGINE *e)
539 ENGINEerr(ENGINE_F_ENGINE_GET_RSA,
540 ERR_R_PASSED_NULL_PARAMETER);
546 const DSA_METHOD *ENGINE_get_DSA(ENGINE *e)
550 ENGINEerr(ENGINE_F_ENGINE_GET_DSA,
551 ERR_R_PASSED_NULL_PARAMETER);
557 const DH_METHOD *ENGINE_get_DH(ENGINE *e)
561 ENGINEerr(ENGINE_F_ENGINE_GET_DH,
562 ERR_R_PASSED_NULL_PARAMETER);
568 RAND_METHOD *ENGINE_get_RAND(ENGINE *e)
572 ENGINEerr(ENGINE_F_ENGINE_GET_RAND,
573 ERR_R_PASSED_NULL_PARAMETER);
579 BN_MOD_EXP ENGINE_get_BN_mod_exp(ENGINE *e)
583 ENGINEerr(ENGINE_F_ENGINE_GET_BN_MOD_EXP,
584 ERR_R_PASSED_NULL_PARAMETER);
587 return e->bn_mod_exp;
590 BN_MOD_EXP_CRT ENGINE_get_BN_mod_exp_crt(ENGINE *e)
594 ENGINEerr(ENGINE_F_ENGINE_GET_BN_MOD_EXP_CRT,
595 ERR_R_PASSED_NULL_PARAMETER);
598 return e->bn_mod_exp_crt;
601 ENGINE_GEN_INT_FUNC_PTR ENGINE_get_init_function(ENGINE *e)
605 ENGINEerr(ENGINE_F_ENGINE_GET_INIT_FUNCTION,
606 ERR_R_PASSED_NULL_PARAMETER);
612 ENGINE_GEN_INT_FUNC_PTR ENGINE_get_finish_function(ENGINE *e)
616 ENGINEerr(ENGINE_F_ENGINE_GET_FINISH_FUNCTION,
617 ERR_R_PASSED_NULL_PARAMETER);
623 ENGINE_CTRL_FUNC_PTR ENGINE_get_ctrl_function(ENGINE *e)
627 ENGINEerr(ENGINE_F_ENGINE_GET_CTRL_FUNCTION,
628 ERR_R_PASSED_NULL_PARAMETER);