2 /* Written by Geoff Thorpe (geoff@geoffthorpe.net) for the OpenSSL
5 /* ====================================================================
6 * Copyright (c) 1999-2001 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 #ifndef HEADER_ENGINE_H
60 #define HEADER_ENGINE_H
62 #include <openssl/types.h>
63 #include <openssl/bn.h>
64 #ifndef OPENSSL_NO_RSA
65 #include <openssl/rsa.h>
67 #ifndef OPENSSL_NO_DSA
68 #include <openssl/dsa.h>
71 #include <openssl/dh.h>
73 #include <openssl/rand.h>
74 #include <openssl/ui.h>
75 #include <openssl/symhacks.h>
76 #include <openssl/err.h>
82 /* Fixups for missing algorithms */
84 typedef void RSA_METHOD;
87 typedef void DSA_METHOD;
90 typedef void DH_METHOD;
93 /* These flags are used to control combinations of algorithm (methods)
94 * by bitwise "OR"ing. */
95 #define ENGINE_METHOD_RSA (unsigned int)0x0001
96 #define ENGINE_METHOD_DSA (unsigned int)0x0002
97 #define ENGINE_METHOD_DH (unsigned int)0x0004
98 #define ENGINE_METHOD_RAND (unsigned int)0x0008
99 #define ENGINE_METHOD_BN_MOD_EXP (unsigned int)0x0010
100 #define ENGINE_METHOD_BN_MOD_EXP_CRT (unsigned int)0x0020
101 /* Obvious all-or-nothing cases. */
102 #define ENGINE_METHOD_ALL (unsigned int)0xFFFF
103 #define ENGINE_METHOD_NONE (unsigned int)0x0000
105 /* This(ese) flag(s) controls behaviour of the ENGINE_TABLE mechanism used
106 * internally to control registration of ENGINE implementations, and can be set
107 * by ENGINE_set_table_flags(). The "NOINIT" flag prevents attempts to
108 * initialise registered ENGINEs if they are not already initialised. */
109 #define ENGINE_TABLE_FLAG_NOINIT (unsigned int)0x0001
111 /* ENGINE flags that can be set by ENGINE_set_flags(). */
112 /* #define ENGINE_FLAGS_MALLOCED 0x0001 */ /* Not used */
114 /* This flag is for ENGINEs that wish to handle the various 'CMD'-related
115 * control commands on their own. Without this flag, ENGINE_ctrl() handles these
116 * control commands on behalf of the ENGINE using their "cmd_defns" data. */
117 #define ENGINE_FLAGS_MANUAL_CMD_CTRL (int)0x0002
119 /* This flag is for ENGINEs who return new duplicate structures when found via
120 * "ENGINE_by_id()". When an ENGINE must store state (eg. if ENGINE_ctrl()
121 * commands are called in sequence as part of some stateful process like
122 * key-generation setup and execution), it can set this flag - then each attempt
123 * to obtain the ENGINE will result in it being copied into a new structure.
124 * Normally, ENGINEs don't declare this flag so ENGINE_by_id() just increments
125 * the existing ENGINE's structural reference count. */
126 #define ENGINE_FLAGS_BY_ID_COPY (int)0x0004
128 /* ENGINEs can support their own command types, and these flags are used in
129 * ENGINE_CTRL_GET_CMD_FLAGS to indicate to the caller what kind of input each
130 * command expects. Currently only numeric and string input is supported. If a
131 * control command supports none of the _NUMERIC, _STRING, or _NO_INPUT options,
132 * then it is regarded as an "internal" control command - and not for use in
133 * config setting situations. As such, they're not available to the
134 * ENGINE_ctrl_cmd_string() function, only raw ENGINE_ctrl() access. Changes to
135 * this list of 'command types' should be reflected carefully in
136 * ENGINE_cmd_is_executable() and ENGINE_ctrl_cmd_string(). */
138 /* accepts a 'long' input value (3rd parameter to ENGINE_ctrl) */
139 #define ENGINE_CMD_FLAG_NUMERIC (unsigned int)0x0001
140 /* accepts string input (cast from 'void*' to 'const char *', 4th parameter to
142 #define ENGINE_CMD_FLAG_STRING (unsigned int)0x0002
143 /* Indicates that the control command takes *no* input. Ie. the control command
144 * is unparameterised. */
145 #define ENGINE_CMD_FLAG_NO_INPUT (unsigned int)0x0004
146 /* Indicates that the control command is internal. This control command won't
147 * be shown in any output, and is only usable through the ENGINE_ctrl_cmd()
149 #define ENGINE_CMD_FLAG_INTERNAL (unsigned int)0x0008
151 /* NB: These 3 control commands are deprecated and should not be used. ENGINEs
152 * relying on these commands should compile conditional support for
153 * compatibility (eg. if these symbols are defined) but should also migrate the
154 * same functionality to their own ENGINE-specific control functions that can be
155 * "discovered" by calling applications. The fact these control commands
156 * wouldn't be "executable" (ie. usable by text-based config) doesn't change the
157 * fact that application code can find and use them without requiring per-ENGINE
160 /* These flags are used to tell the ctrl function what should be done.
161 * All command numbers are shared between all engines, even if some don't
162 * make sense to some engines. In such a case, they do nothing but return
163 * the error ENGINE_R_CTRL_COMMAND_NOT_IMPLEMENTED. */
164 #define ENGINE_CTRL_SET_LOGSTREAM 1
165 #define ENGINE_CTRL_SET_PASSWORD_CALLBACK 2
166 #define ENGINE_CTRL_HUP 3 /* Close and reinitialise any
167 handles/connections etc. */
168 #define ENGINE_CTRL_SET_USER_INTERFACE 4 /* Alternative to callback */
169 #define ENGINE_CTRL_SET_CALLBACK_DATA 5 /* User-specific data, used
170 when calling the password
171 callback and the user
174 /* These control commands allow an application to deal with an arbitrary engine
175 * in a dynamic way. Warn: Negative return values indicate errors FOR THESE
176 * COMMANDS because zero is used to indicate 'end-of-list'. Other commands,
177 * including ENGINE-specific command types, return zero for an error.
179 * An ENGINE can choose to implement these ctrl functions, and can internally
180 * manage things however it chooses - it does so by setting the
181 * ENGINE_FLAGS_MANUAL_CMD_CTRL flag (using ENGINE_set_flags()). Otherwise the
182 * ENGINE_ctrl() code handles this on the ENGINE's behalf using the cmd_defns
183 * data (set using ENGINE_set_cmd_defns()). This means an ENGINE's ctrl()
184 * handler need only implement its own commands - the above "meta" commands will
185 * be taken care of. */
187 /* Returns non-zero if the supplied ENGINE has a ctrl() handler. If "not", then
188 * all the remaining control commands will return failure, so it is worth
189 * checking this first if the caller is trying to "discover" the engine's
190 * capabilities and doesn't want errors generated unnecessarily. */
191 #define ENGINE_CTRL_HAS_CTRL_FUNCTION 10
192 /* Returns a positive command number for the first command supported by the
193 * engine. Returns zero if no ctrl commands are supported. */
194 #define ENGINE_CTRL_GET_FIRST_CMD_TYPE 11
195 /* The 'long' argument specifies a command implemented by the engine, and the
196 * return value is the next command supported, or zero if there are no more. */
197 #define ENGINE_CTRL_GET_NEXT_CMD_TYPE 12
198 /* The 'void*' argument is a command name (cast from 'const char *'), and the
199 * return value is the command that corresponds to it. */
200 #define ENGINE_CTRL_GET_CMD_FROM_NAME 13
201 /* The next two allow a command to be converted into its corresponding string
202 * form. In each case, the 'long' argument supplies the command. In the NAME_LEN
203 * case, the return value is the length of the command name (not counting a
204 * trailing EOL). In the NAME case, the 'void*' argument must be a string buffer
205 * large enough, and it will be populated with the name of the command (WITH a
207 #define ENGINE_CTRL_GET_NAME_LEN_FROM_CMD 14
208 #define ENGINE_CTRL_GET_NAME_FROM_CMD 15
209 /* The next two are similar but give a "short description" of a command. */
210 #define ENGINE_CTRL_GET_DESC_LEN_FROM_CMD 16
211 #define ENGINE_CTRL_GET_DESC_FROM_CMD 17
212 /* With this command, the return value is the OR'd combination of
213 * ENGINE_CMD_FLAG_*** values that indicate what kind of input a given
214 * engine-specific ctrl command expects. */
215 #define ENGINE_CTRL_GET_CMD_FLAGS 18
217 /* ENGINE implementations should start the numbering of their own control
218 * commands from this value. (ie. ENGINE_CMD_BASE, ENGINE_CMD_BASE + 1, etc). */
219 #define ENGINE_CMD_BASE 200
221 /* NB: These 2 nCipher "chil" control commands are deprecated, and their
222 * functionality is now available through ENGINE-specific control commands
223 * (exposed through the above-mentioned 'CMD'-handling). Code using these 2
224 * commands should be migrated to the more general command handling before these
227 /* Flags specific to the nCipher "chil" engine */
228 #define ENGINE_CTRL_CHIL_SET_FORKCHECK 100
229 /* Depending on the value of the (long)i argument, this sets or
230 * unsets the SimpleForkCheck flag in the CHIL API to enable or
231 * disable checking and workarounds for applications that fork().
233 #define ENGINE_CTRL_CHIL_NO_LOCKING 101
234 /* This prevents the initialisation function from providing mutex
235 * callbacks to the nCipher library. */
237 /* If an ENGINE supports its own specific control commands and wishes the
238 * framework to handle the above 'ENGINE_CMD_***'-manipulation commands on its
239 * behalf, it should supply a null-terminated array of ENGINE_CMD_DEFN entries
240 * to ENGINE_set_cmd_defns(). It should also implement a ctrl() handler that
241 * supports the stated commands (ie. the "cmd_num" entries as described by the
242 * array). NB: The array must be ordered in increasing order of cmd_num.
243 * "null-terminated" means that the last ENGINE_CMD_DEFN element has cmd_num set
244 * to zero and/or cmd_name set to NULL. */
245 typedef struct ENGINE_CMD_DEFN_st
247 unsigned int cmd_num; /* The command number */
248 const char *cmd_name; /* The command name itself */
249 const char *cmd_desc; /* A short description of the command */
250 unsigned int cmd_flags; /* The input the command expects */
253 /* Generic function pointer */
254 typedef int (*ENGINE_GEN_FUNC_PTR)();
255 /* Generic function pointer taking no arguments */
256 typedef int (*ENGINE_GEN_INT_FUNC_PTR)(ENGINE *);
257 /* Specific control function pointer */
258 typedef int (*ENGINE_CTRL_FUNC_PTR)(ENGINE *, int, long, void *, void (*f)());
259 /* Generic load_key function pointer */
260 typedef EVP_PKEY * (*ENGINE_LOAD_KEY_PTR)(ENGINE *, const char *,
261 UI_METHOD *ui_method, void *callback_data);
263 /* STRUCTURE functions ... all of these functions deal with pointers to ENGINE
264 * structures where the pointers have a "structural reference". This means that
265 * their reference is to allowed access to the structure but it does not imply
266 * that the structure is functional. To simply increment or decrement the
267 * structural reference count, use ENGINE_by_id and ENGINE_free. NB: This is not
268 * required when iterating using ENGINE_get_next as it will automatically
269 * decrement the structural reference count of the "current" ENGINE and
270 * increment the structural reference count of the ENGINE it returns (unless it
273 /* Get the first/last "ENGINE" type available. */
274 ENGINE *ENGINE_get_first(void);
275 ENGINE *ENGINE_get_last(void);
276 /* Iterate to the next/previous "ENGINE" type (NULL = end of the list). */
277 ENGINE *ENGINE_get_next(ENGINE *e);
278 ENGINE *ENGINE_get_prev(ENGINE *e);
279 /* Add another "ENGINE" type into the array. */
280 int ENGINE_add(ENGINE *e);
281 /* Remove an existing "ENGINE" type from the array. */
282 int ENGINE_remove(ENGINE *e);
283 /* Retrieve an engine from the list by its unique "id" value. */
284 ENGINE *ENGINE_by_id(const char *id);
285 /* Add all the built-in engines. */
286 void ENGINE_load_openssl(void);
287 void ENGINE_load_dynamic(void);
288 void ENGINE_load_cswift(void);
289 void ENGINE_load_chil(void);
290 void ENGINE_load_atalla(void);
291 void ENGINE_load_nuron(void);
292 void ENGINE_load_ubsec(void);
293 void ENGINE_load_openbsd_dev_crypto(void);
294 void ENGINE_load_builtin_engines(void);
296 /* Get and set global flags (ENGINE_TABLE_FLAG_***) for the implementation
297 * "registry" handling. */
298 unsigned int ENGINE_get_table_flags(void);
299 void ENGINE_set_table_flags(unsigned int flags);
301 /* Manage registration of ENGINEs per "table". For each type, there are 3
303 * ENGINE_register_***(e) - registers the implementation from 'e' (if it has one)
304 * ENGINE_unregister_***(e) - unregister the implementation from 'e'
305 * ENGINE_register_all_***() - call ENGINE_register_***() for each 'e' in the list
306 * Cleanup is automatically registered from each table when required, so
307 * ENGINE_cleanup() will reverse any "register" operations. */
309 int ENGINE_register_RSA(ENGINE *e);
310 void ENGINE_unregister_RSA(ENGINE *e);
311 void ENGINE_register_all_RSA(void);
313 int ENGINE_register_DSA(ENGINE *e);
314 void ENGINE_unregister_DSA(ENGINE *e);
315 void ENGINE_register_all_DSA(void);
317 int ENGINE_register_DH(ENGINE *e);
318 void ENGINE_unregister_DH(ENGINE *e);
319 void ENGINE_register_all_DH(void);
321 int ENGINE_register_RAND(ENGINE *e);
322 void ENGINE_unregister_RAND(ENGINE *e);
323 void ENGINE_register_all_RAND(void);
325 /* These functions register all support from the above categories. Note, use of
326 * these functions can result in static linkage of code your application may not
327 * need. If you only need a subset of functionality, consider using more
328 * selective initialisation. */
329 int ENGINE_register_complete(ENGINE *e);
330 int ENGINE_register_all_complete(void);
332 /* Send parametrised control commands to the engine. The possibilities to send
333 * down an integer, a pointer to data or a function pointer are provided. Any of
334 * the parameters may or may not be NULL, depending on the command number. In
335 * actuality, this function only requires a structural (rather than functional)
336 * reference to an engine, but many control commands may require the engine be
337 * functional. The caller should be aware of trying commands that require an
338 * operational ENGINE, and only use functional references in such situations. */
339 int ENGINE_ctrl(ENGINE *e, int cmd, long i, void *p, void (*f)());
341 /* This function tests if an ENGINE-specific command is usable as a "setting".
342 * Eg. in an application's config file that gets processed through
343 * ENGINE_ctrl_cmd_string(). If this returns zero, it is not available to
344 * ENGINE_ctrl_cmd_string(), only ENGINE_ctrl(). */
345 int ENGINE_cmd_is_executable(ENGINE *e, int cmd);
347 /* This function works like ENGINE_ctrl() with the exception of taking a
348 * command name instead of a command number, and can handle optional commands.
349 * See the comment on ENGINE_ctrl_cmd_string() for an explanation on how to
350 * use the cmd_name and cmd_optional. */
351 int ENGINE_ctrl_cmd(ENGINE *e, const char *cmd_name,
352 long i, void *p, void (*f)(), int cmd_optional);
354 /* This function passes a command-name and argument to an ENGINE. The cmd_name
355 * is converted to a command number and the control command is called using
356 * 'arg' as an argument (unless the ENGINE doesn't support such a command, in
357 * which case no control command is called). The command is checked for input
358 * flags, and if necessary the argument will be converted to a numeric value. If
359 * cmd_optional is non-zero, then if the ENGINE doesn't support the given
360 * cmd_name the return value will be success anyway. This function is intended
361 * for applications to use so that users (or config files) can supply
362 * engine-specific config data to the ENGINE at run-time to control behaviour of
363 * specific engines. As such, it shouldn't be used for calling ENGINE_ctrl()
364 * functions that return data, deal with binary data, or that are otherwise
365 * supposed to be used directly through ENGINE_ctrl() in application code. Any
366 * "return" data from an ENGINE_ctrl() operation in this function will be lost -
367 * the return value is interpreted as failure if the return value is zero,
368 * success otherwise, and this function returns a boolean value as a result. In
369 * other words, vendors of 'ENGINE'-enabled devices should write ENGINE
370 * implementations with parameterisations that work in this scheme, so that
371 * compliant ENGINE-based applications can work consistently with the same
372 * configuration for the same ENGINE-enabled devices, across applications. */
373 int ENGINE_ctrl_cmd_string(ENGINE *e, const char *cmd_name, const char *arg,
376 /* These functions are useful for manufacturing new ENGINE structures. They
377 * don't address reference counting at all - one uses them to populate an ENGINE
378 * structure with personalised implementations of things prior to using it
379 * directly or adding it to the builtin ENGINE list in OpenSSL. These are also
380 * here so that the ENGINE structure doesn't have to be exposed and break binary
382 ENGINE *ENGINE_new(void);
383 int ENGINE_free(ENGINE *e);
384 int ENGINE_set_id(ENGINE *e, const char *id);
385 int ENGINE_set_name(ENGINE *e, const char *name);
386 int ENGINE_set_RSA(ENGINE *e, const RSA_METHOD *rsa_meth);
387 int ENGINE_set_DSA(ENGINE *e, const DSA_METHOD *dsa_meth);
388 int ENGINE_set_DH(ENGINE *e, const DH_METHOD *dh_meth);
389 int ENGINE_set_RAND(ENGINE *e, const RAND_METHOD *rand_meth);
390 int ENGINE_set_destroy_function(ENGINE *e, ENGINE_GEN_INT_FUNC_PTR destroy_f);
391 int ENGINE_set_init_function(ENGINE *e, ENGINE_GEN_INT_FUNC_PTR init_f);
392 int ENGINE_set_finish_function(ENGINE *e, ENGINE_GEN_INT_FUNC_PTR finish_f);
393 int ENGINE_set_ctrl_function(ENGINE *e, ENGINE_CTRL_FUNC_PTR ctrl_f);
394 int ENGINE_set_load_privkey_function(ENGINE *e, ENGINE_LOAD_KEY_PTR loadpriv_f);
395 int ENGINE_set_load_pubkey_function(ENGINE *e, ENGINE_LOAD_KEY_PTR loadpub_f);
396 int ENGINE_set_flags(ENGINE *e, int flags);
397 int ENGINE_set_cmd_defns(ENGINE *e, const ENGINE_CMD_DEFN *defns);
398 int ENGINE_add_cipher(ENGINE *e,const EVP_CIPHER *c);
399 /* These functions (and the "get" function lower down) allow control over any
400 * per-structure ENGINE data. */
401 int ENGINE_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
402 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func);
403 int ENGINE_set_ex_data(ENGINE *e, int idx, void *arg);
405 /* This function cleans up anything that needs it. Eg. the ENGINE_add() function
406 * automatically ensures the list cleanup function is registered to be called
407 * from ENGINE_cleanup(). Similarly, all ENGINE_register_*** functions ensure
408 * ENGINE_cleanup() will clean up after them. */
409 void ENGINE_cleanup(void);
411 /* These return values from within the ENGINE structure. These can be useful
412 * with functional references as well as structural references - it depends
413 * which you obtained. Using the result for functional purposes if you only
414 * obtained a structural reference may be problematic! */
415 const char *ENGINE_get_id(const ENGINE *e);
416 const char *ENGINE_get_name(const ENGINE *e);
417 const RSA_METHOD *ENGINE_get_RSA(const ENGINE *e);
418 const DSA_METHOD *ENGINE_get_DSA(const ENGINE *e);
419 const DH_METHOD *ENGINE_get_DH(const ENGINE *e);
420 const RAND_METHOD *ENGINE_get_RAND(const ENGINE *e);
421 ENGINE_GEN_INT_FUNC_PTR ENGINE_get_destroy_function(const ENGINE *e);
422 ENGINE_GEN_INT_FUNC_PTR ENGINE_get_init_function(const ENGINE *e);
423 ENGINE_GEN_INT_FUNC_PTR ENGINE_get_finish_function(const ENGINE *e);
424 ENGINE_CTRL_FUNC_PTR ENGINE_get_ctrl_function(const ENGINE *e);
425 ENGINE_LOAD_KEY_PTR ENGINE_get_load_privkey_function(const ENGINE *e);
426 ENGINE_LOAD_KEY_PTR ENGINE_get_load_pubkey_function(const ENGINE *e);
427 const ENGINE_CMD_DEFN *ENGINE_get_cmd_defns(const ENGINE *e);
428 int ENGINE_get_flags(const ENGINE *e);
429 void *ENGINE_get_ex_data(const ENGINE *e, int idx);
431 /* FUNCTIONAL functions. These functions deal with ENGINE structures
432 * that have (or will) be initialised for use. Broadly speaking, the
433 * structural functions are useful for iterating the list of available
434 * engine types, creating new engine types, and other "list" operations.
435 * These functions actually deal with ENGINEs that are to be used. As
436 * such these functions can fail (if applicable) when particular
437 * engines are unavailable - eg. if a hardware accelerator is not
438 * attached or not functioning correctly. Each ENGINE has 2 reference
439 * counts; structural and functional. Every time a functional reference
440 * is obtained or released, a corresponding structural reference is
441 * automatically obtained or released too. */
443 /* Initialise a engine type for use (or up its reference count if it's
444 * already in use). This will fail if the engine is not currently
445 * operational and cannot initialise. */
446 int ENGINE_init(ENGINE *e);
447 /* Free a functional reference to a engine type. This does not require
448 * a corresponding call to ENGINE_free as it also releases a structural
450 int ENGINE_finish(ENGINE *e);
452 /* The following functions handle keys that are stored in some secondary
453 * location, handled by the engine. The storage may be on a card or
455 EVP_PKEY *ENGINE_load_private_key(ENGINE *e, const char *key_id,
456 UI_METHOD *ui_method, void *callback_data);
457 EVP_PKEY *ENGINE_load_public_key(ENGINE *e, const char *key_id,
458 UI_METHOD *ui_method, void *callback_data);
460 /* This returns a pointer for the current ENGINE structure that
461 * is (by default) performing any RSA operations. The value returned
462 * is an incremented reference, so it should be free'd (ENGINE_finish)
463 * before it is discarded. */
464 ENGINE *ENGINE_get_default_RSA(void);
465 /* Same for the other "methods" */
466 ENGINE *ENGINE_get_default_DSA(void);
467 ENGINE *ENGINE_get_default_DH(void);
468 ENGINE *ENGINE_get_default_RAND(void);
470 /* This sets a new default ENGINE structure for performing RSA
471 * operations. If the result is non-zero (success) then the ENGINE
472 * structure will have had its reference count up'd so the caller
473 * should still free their own reference 'e'. */
474 int ENGINE_set_default_RSA(ENGINE *e);
475 /* Same for the other "methods" */
476 int ENGINE_set_default_DSA(ENGINE *e);
477 int ENGINE_set_default_DH(ENGINE *e);
478 int ENGINE_set_default_RAND(ENGINE *e);
480 /* The combination "set" - the flags are bitwise "OR"d from the
481 * ENGINE_METHOD_*** defines above. As with the "ENGINE_register_complete()"
482 * function, this function can result in unnecessary static linkage. If your
483 * application requires only specific functionality, consider using more
484 * selective functions. */
485 int ENGINE_set_default(ENGINE *e, unsigned int flags);
487 /* Deprecated functions ... */
488 /* int ENGINE_clear_defaults(void); */
490 /**************************/
491 /* DYNAMIC ENGINE SUPPORT */
492 /**************************/
494 /* Binary/behaviour compatibility levels */
495 #define OSSL_DYNAMIC_VERSION (unsigned long)0x00010100
496 /* Binary versions older than this are too old for us (whether we're a loader or
498 #define OSSL_DYNAMIC_OLDEST (unsigned long)0x00010100
500 /* When compiling an ENGINE entirely as an external shared library, loadable by
501 * the "dynamic" ENGINE, these types are needed. The 'dynamic_fns' structure
502 * type provides the calling application's (or library's) error functionality
503 * and memory management function pointers to the loaded library. These should
504 * be used/set in the loaded library code so that the loading application's
505 * 'state' will be used/changed in all operations. */
506 typedef void *(*dyn_MEM_malloc_cb)(size_t);
507 typedef void *(*dyn_MEM_realloc_cb)(void *, size_t);
508 typedef void (*dyn_MEM_free_cb)(void *);
509 typedef struct st_dynamic_MEM_fns {
510 dyn_MEM_malloc_cb malloc_cb;
511 dyn_MEM_realloc_cb realloc_cb;
512 dyn_MEM_free_cb free_cb;
514 /* FIXME: Perhaps the memory and locking code (crypto.h) should declare and use
515 * these types so we (and any other dependant code) can simplify a bit?? */
516 typedef void (*dyn_lock_locking_cb)(int,int,const char *,int);
517 typedef int (*dyn_lock_add_lock_cb)(int*,int,int,const char *,int);
518 typedef struct CRYPTO_dynlock_value *(*dyn_dynlock_create_cb)(
520 typedef void (*dyn_dynlock_lock_cb)(int,struct CRYPTO_dynlock_value *,
522 typedef void (*dyn_dynlock_destroy_cb)(struct CRYPTO_dynlock_value *,
524 typedef struct st_dynamic_LOCK_fns {
525 dyn_lock_locking_cb lock_locking_cb;
526 dyn_lock_add_lock_cb lock_add_lock_cb;
527 dyn_dynlock_create_cb dynlock_create_cb;
528 dyn_dynlock_lock_cb dynlock_lock_cb;
529 dyn_dynlock_destroy_cb dynlock_destroy_cb;
531 /* The top-level structure */
532 typedef struct st_dynamic_fns {
533 const ERR_FNS *err_fns;
534 const CRYPTO_EX_DATA_IMPL *ex_data_fns;
535 dynamic_MEM_fns mem_fns;
536 dynamic_LOCK_fns lock_fns;
539 /* The version checking function should be of this prototype. NB: The
540 * ossl_version value passed in is the OSSL_DYNAMIC_VERSION of the loading code.
541 * If this function returns zero, it indicates a (potential) version
542 * incompatibility and the loaded library doesn't believe it can proceed.
543 * Otherwise, the returned value is the (latest) version supported by the
544 * loading library. The loader may still decide that the loaded code's version
545 * is unsatisfactory and could veto the load. The function is expected to
546 * be implemented with the symbol name "v_check", and a default implementation
547 * can be fully instantiated with IMPLEMENT_DYNAMIC_CHECK_FN(). */
548 typedef unsigned long (*dynamic_v_check_fn)(unsigned long ossl_version);
549 #define IMPLEMENT_DYNAMIC_CHECK_FN() \
550 unsigned long v_check(unsigned long v) { \
551 if(v >= OSSL_DYNAMIC_OLDEST) return OSSL_DYNAMIC_VERSION; \
554 /* This function is passed the ENGINE structure to initialise with its own
555 * function and command settings. It should not adjust the structural or
556 * functional reference counts. If this function returns zero, (a) the load will
557 * be aborted, (b) the previous ENGINE state will be memcpy'd back onto the
558 * structure, and (c) the shared library will be unloaded. So implementations
559 * should do their own internal cleanup in failure circumstances otherwise they
560 * could leak. The 'id' parameter, if non-NULL, represents the ENGINE id that
561 * the loader is looking for. If this is NULL, the shared library can choose to
562 * return failure or to initialise a 'default' ENGINE. If non-NULL, the shared
563 * library must initialise only an ENGINE matching the passed 'id'. The function
564 * is expected to be implemented with the symbol name "bind_engine". A standard
565 * implementation can be instantiated with IMPLEMENT_DYNAMIC_BIND_FN(fn) where
566 * the parameter 'fn' is a callback function that populates the ENGINE structure
567 * and returns an int value (zero for failure). 'fn' should have prototype;
568 * [static] int fn(ENGINE *e, const char *id); */
569 typedef int (*dynamic_bind_engine)(ENGINE *e, const char *id,
570 const dynamic_fns *fns);
571 #define IMPLEMENT_DYNAMIC_BIND_FN(fn) \
572 int bind_engine(ENGINE *e, const char *id, const dynamic_fns *fns) { \
573 if(!CRYPTO_set_mem_functions(fns->mem_fns.malloc_cb, \
574 fns->mem_fns.realloc_cb, fns->mem_fns.free_cb)) \
576 CRYPTO_set_locking_callback(fns->lock_fns.lock_locking_cb); \
577 CRYPTO_set_add_lock_callback(fns->lock_fns.lock_add_lock_cb); \
578 CRYPTO_set_dynlock_create_callback(fns->lock_fns.dynlock_create_cb); \
579 CRYPTO_set_dynlock_lock_callback(fns->lock_fns.dynlock_lock_cb); \
580 CRYPTO_set_dynlock_destroy_callback(fns->lock_fns.dynlock_destroy_cb); \
581 if(!CRYPTO_set_ex_data_implementation(fns->ex_data_fns)) \
583 if(!ERR_set_implementation(fns->err_fns)) return 0; \
584 if(!fn(e,id)) return 0; \
587 /* BEGIN ERROR CODES */
588 /* The following lines are auto generated by the script mkerr.pl. Any changes
589 * made after this point may be overwritten when the script is next run.
591 void ERR_load_ENGINE_strings(void);
593 /* Error codes for the ENGINE functions. */
595 /* Function codes. */
596 #define ENGINE_F_DYNAMIC_CTRL 180
597 #define ENGINE_F_DYNAMIC_GET_DATA_CTX 181
598 #define ENGINE_F_DYNAMIC_LOAD 182
599 #define ENGINE_F_ENGINE_ADD 105
600 #define ENGINE_F_ENGINE_BY_ID 106
601 #define ENGINE_F_ENGINE_CMD_IS_EXECUTABLE 170
602 #define ENGINE_F_ENGINE_CTRL 142
603 #define ENGINE_F_ENGINE_CTRL_CMD 178
604 #define ENGINE_F_ENGINE_CTRL_CMD_STRING 171
605 #define ENGINE_F_ENGINE_FINISH 107
606 #define ENGINE_F_ENGINE_FREE 108
607 #define ENGINE_F_ENGINE_GET_DEFAULT_TYPE 177
608 #define ENGINE_F_ENGINE_GET_NEXT 115
609 #define ENGINE_F_ENGINE_GET_PREV 116
610 #define ENGINE_F_ENGINE_INIT 119
611 #define ENGINE_F_ENGINE_LIST_ADD 120
612 #define ENGINE_F_ENGINE_LIST_REMOVE 121
613 #define ENGINE_F_ENGINE_LOAD_PRIVATE_KEY 150
614 #define ENGINE_F_ENGINE_LOAD_PUBLIC_KEY 151
615 #define ENGINE_F_ENGINE_NEW 122
616 #define ENGINE_F_ENGINE_REMOVE 123
617 #define ENGINE_F_ENGINE_SET_DEFAULT_TYPE 126
618 #define ENGINE_F_ENGINE_SET_ID 129
619 #define ENGINE_F_ENGINE_SET_NAME 130
620 #define ENGINE_F_ENGINE_TABLE_REGISTER 184
621 #define ENGINE_F_ENGINE_UNLOAD_KEY 152
622 #define ENGINE_F_INT_CTRL_HELPER 172
623 #define ENGINE_F_LOG_MESSAGE 141
624 #define ENGINE_F_SET_DATA_CTX 183
627 #define ENGINE_R_ALREADY_LOADED 100
628 #define ENGINE_R_ARGUMENT_IS_NOT_A_NUMBER 133
629 #define ENGINE_R_BIO_WAS_FREED 121
630 #define ENGINE_R_BN_CTX_FULL 101
631 #define ENGINE_R_BN_EXPAND_FAIL 102
632 #define ENGINE_R_CHIL_ERROR 123
633 #define ENGINE_R_CMD_NOT_EXECUTABLE 134
634 #define ENGINE_R_COMMAND_TAKES_INPUT 135
635 #define ENGINE_R_COMMAND_TAKES_NO_INPUT 136
636 #define ENGINE_R_CONFLICTING_ENGINE_ID 103
637 #define ENGINE_R_CTRL_COMMAND_NOT_IMPLEMENTED 119
638 #define ENGINE_R_DH_NOT_IMPLEMENTED 139
639 #define ENGINE_R_DSA_NOT_IMPLEMENTED 140
640 #define ENGINE_R_DSO_FAILURE 104
641 #define ENGINE_R_DSO_FUNCTION_NOT_FOUND 131
642 #define ENGINE_R_DSO_NOT_FOUND 132
643 #define ENGINE_R_ENGINE_IS_NOT_IN_LIST 105
644 #define ENGINE_R_FAILED_LOADING_PRIVATE_KEY 128
645 #define ENGINE_R_FAILED_LOADING_PUBLIC_KEY 129
646 #define ENGINE_R_FINISH_FAILED 106
647 #define ENGINE_R_GET_HANDLE_FAILED 107
648 #define ENGINE_R_ID_OR_NAME_MISSING 108
649 #define ENGINE_R_INIT_FAILED 109
650 #define ENGINE_R_INTERNAL_LIST_ERROR 110
651 #define ENGINE_R_INVALID_ARGUMENT 143
652 #define ENGINE_R_INVALID_CMD_NAME 137
653 #define ENGINE_R_INVALID_CMD_NUMBER 138
654 #define ENGINE_R_MISSING_KEY_COMPONENTS 111
655 #define ENGINE_R_NOT_INITIALISED 117
656 #define ENGINE_R_NOT_LOADED 112
657 #define ENGINE_R_NO_CALLBACK 127
658 #define ENGINE_R_NO_CONTROL_FUNCTION 120
659 #define ENGINE_R_NO_INDEX 144
660 #define ENGINE_R_NO_KEY 124
661 #define ENGINE_R_NO_LOAD_FUNCTION 125
662 #define ENGINE_R_NO_REFERENCE 130
663 #define ENGINE_R_NO_SUCH_ENGINE 116
664 #define ENGINE_R_NO_UNLOAD_FUNCTION 126
665 #define ENGINE_R_PRIVATE_KEY_ALGORITHMS_DISABLED 142
666 #define ENGINE_R_PROVIDE_PARAMETERS 113
667 #define ENGINE_R_REQUEST_FAILED 114
668 #define ENGINE_R_REQUEST_FALLBACK 118
669 #define ENGINE_R_RSA_NOT_IMPLEMENTED 141
670 #define ENGINE_R_SIZE_TOO_LARGE_OR_TOO_SMALL 122
671 #define ENGINE_R_UNIT_FAILURE 115
672 #define ENGINE_R_VERSION_INCOMPATIBILITY 145