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engine.h
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1 /* openssl/engine.h */
2 /* Written by Geoff Thorpe ([email protected]) for the OpenSSL
3  * project 2000.
4  */
5 /* ====================================================================
6  * Copyright (c) 1999-2004 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
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11  *
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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  *
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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/)"
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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
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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  * ([email protected]). This product includes software written by Tim
55  * Hudson ([email protected]).
56  *
57  */
58 /* ====================================================================
59  * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
60  * ECDH support in OpenSSL originally developed by
61  * SUN MICROSYSTEMS, INC., and contributed to the OpenSSL project.
62  */
63 
64 #ifndef HEADER_ENGINE_H
65 #define HEADER_ENGINE_H
66 
67 #include <openssl/opensslconf.h>
68 
69 #ifdef OPENSSL_NO_ENGINE
70 #error ENGINE is disabled.
71 #endif
72 
73 #ifndef OPENSSL_NO_DEPRECATED
74 #include <openssl/bn.h>
75 #ifndef OPENSSL_NO_RSA
76 #include <openssl/rsa.h>
77 #endif
78 #ifndef OPENSSL_NO_DSA
79 #include <openssl/dsa.h>
80 #endif
81 #ifndef OPENSSL_NO_DH
82 #include <openssl/dh.h>
83 #endif
84 #ifndef OPENSSL_NO_ECDH
85 #include <openssl/ecdh.h>
86 #endif
87 #ifndef OPENSSL_NO_ECDSA
88 #include <openssl/ecdsa.h>
89 #endif
90 #include <openssl/rand.h>
91 #include <openssl/ui.h>
92 #include <openssl/err.h>
93 #endif
94 
95 #include <openssl/ossl_typ.h>
96 #include <openssl/symhacks.h>
97 
98 #include <openssl/x509.h>
99 
100 #ifdef __cplusplus
101 extern "C" {
102 #endif
103 
104 /* These flags are used to control combinations of algorithm (methods)
105  * by bitwise "OR"ing. */
106 #define ENGINE_METHOD_RSA (unsigned int)0x0001
107 #define ENGINE_METHOD_DSA (unsigned int)0x0002
108 #define ENGINE_METHOD_DH (unsigned int)0x0004
109 #define ENGINE_METHOD_RAND (unsigned int)0x0008
110 #define ENGINE_METHOD_ECDH (unsigned int)0x0010
111 #define ENGINE_METHOD_ECDSA (unsigned int)0x0020
112 #define ENGINE_METHOD_CIPHERS (unsigned int)0x0040
113 #define ENGINE_METHOD_DIGESTS (unsigned int)0x0080
114 #define ENGINE_METHOD_STORE (unsigned int)0x0100
115 #define ENGINE_METHOD_PKEY_METHS (unsigned int)0x0200
116 #define ENGINE_METHOD_PKEY_ASN1_METHS (unsigned int)0x0400
117 /* Obvious all-or-nothing cases. */
118 #define ENGINE_METHOD_ALL (unsigned int)0xFFFF
119 #define ENGINE_METHOD_NONE (unsigned int)0x0000
120 
121 /* This(ese) flag(s) controls behaviour of the ENGINE_TABLE mechanism used
122  * internally to control registration of ENGINE implementations, and can be set
123  * by ENGINE_set_table_flags(). The "NOINIT" flag prevents attempts to
124  * initialise registered ENGINEs if they are not already initialised. */
125 #define ENGINE_TABLE_FLAG_NOINIT (unsigned int)0x0001
126 
127 /* ENGINE flags that can be set by ENGINE_set_flags(). */
128 /* #define ENGINE_FLAGS_MALLOCED 0x0001 */ /* Not used */
129 
130 /* This flag is for ENGINEs that wish to handle the various 'CMD'-related
131  * control commands on their own. Without this flag, ENGINE_ctrl() handles these
132  * control commands on behalf of the ENGINE using their "cmd_defns" data. */
133 #define ENGINE_FLAGS_MANUAL_CMD_CTRL (int)0x0002
134 
135 /* This flag is for ENGINEs who return new duplicate structures when found via
136  * "ENGINE_by_id()". When an ENGINE must store state (eg. if ENGINE_ctrl()
137  * commands are called in sequence as part of some stateful process like
138  * key-generation setup and execution), it can set this flag - then each attempt
139  * to obtain the ENGINE will result in it being copied into a new structure.
140  * Normally, ENGINEs don't declare this flag so ENGINE_by_id() just increments
141  * the existing ENGINE's structural reference count. */
142 #define ENGINE_FLAGS_BY_ID_COPY (int)0x0004
143 
144 /* This flag if for an ENGINE that does not want its methods registered as
145  * part of ENGINE_register_all_complete() for example if the methods are
146  * not usable as default methods.
147  */
148 
149 #define ENGINE_FLAGS_NO_REGISTER_ALL (int)0x0008
150 
151 /* ENGINEs can support their own command types, and these flags are used in
152  * ENGINE_CTRL_GET_CMD_FLAGS to indicate to the caller what kind of input each
153  * command expects. Currently only numeric and string input is supported. If a
154  * control command supports none of the _NUMERIC, _STRING, or _NO_INPUT options,
155  * then it is regarded as an "internal" control command - and not for use in
156  * config setting situations. As such, they're not available to the
157  * ENGINE_ctrl_cmd_string() function, only raw ENGINE_ctrl() access. Changes to
158  * this list of 'command types' should be reflected carefully in
159  * ENGINE_cmd_is_executable() and ENGINE_ctrl_cmd_string(). */
160 
161 /* accepts a 'long' input value (3rd parameter to ENGINE_ctrl) */
162 #define ENGINE_CMD_FLAG_NUMERIC (unsigned int)0x0001
163 /* accepts string input (cast from 'void*' to 'const char *', 4th parameter to
164  * ENGINE_ctrl) */
165 #define ENGINE_CMD_FLAG_STRING (unsigned int)0x0002
166 /* Indicates that the control command takes *no* input. Ie. the control command
167  * is unparameterised. */
168 #define ENGINE_CMD_FLAG_NO_INPUT (unsigned int)0x0004
169 /* Indicates that the control command is internal. This control command won't
170  * be shown in any output, and is only usable through the ENGINE_ctrl_cmd()
171  * function. */
172 #define ENGINE_CMD_FLAG_INTERNAL (unsigned int)0x0008
173 
174 /* NB: These 3 control commands are deprecated and should not be used. ENGINEs
175  * relying on these commands should compile conditional support for
176  * compatibility (eg. if these symbols are defined) but should also migrate the
177  * same functionality to their own ENGINE-specific control functions that can be
178  * "discovered" by calling applications. The fact these control commands
179  * wouldn't be "executable" (ie. usable by text-based config) doesn't change the
180  * fact that application code can find and use them without requiring per-ENGINE
181  * hacking. */
182 
183 /* These flags are used to tell the ctrl function what should be done.
184  * All command numbers are shared between all engines, even if some don't
185  * make sense to some engines. In such a case, they do nothing but return
186  * the error ENGINE_R_CTRL_COMMAND_NOT_IMPLEMENTED. */
187 #define ENGINE_CTRL_SET_LOGSTREAM 1
188 #define ENGINE_CTRL_SET_PASSWORD_CALLBACK 2
189 #define ENGINE_CTRL_HUP 3 /* Close and reinitialise any
190  handles/connections etc. */
191 #define ENGINE_CTRL_SET_USER_INTERFACE 4 /* Alternative to callback */
192 #define ENGINE_CTRL_SET_CALLBACK_DATA 5 /* User-specific data, used
193  when calling the password
194  callback and the user
195  interface */
196 #define ENGINE_CTRL_LOAD_CONFIGURATION 6 /* Load a configuration, given
197  a string that represents a
198  file name or so */
199 #define ENGINE_CTRL_LOAD_SECTION 7 /* Load data from a given
200  section in the already loaded
201  configuration */
202 
203 /* These control commands allow an application to deal with an arbitrary engine
204  * in a dynamic way. Warn: Negative return values indicate errors FOR THESE
205  * COMMANDS because zero is used to indicate 'end-of-list'. Other commands,
206  * including ENGINE-specific command types, return zero for an error.
207  *
208  * An ENGINE can choose to implement these ctrl functions, and can internally
209  * manage things however it chooses - it does so by setting the
210  * ENGINE_FLAGS_MANUAL_CMD_CTRL flag (using ENGINE_set_flags()). Otherwise the
211  * ENGINE_ctrl() code handles this on the ENGINE's behalf using the cmd_defns
212  * data (set using ENGINE_set_cmd_defns()). This means an ENGINE's ctrl()
213  * handler need only implement its own commands - the above "meta" commands will
214  * be taken care of. */
216 /* Returns non-zero if the supplied ENGINE has a ctrl() handler. If "not", then
217  * all the remaining control commands will return failure, so it is worth
218  * checking this first if the caller is trying to "discover" the engine's
219  * capabilities and doesn't want errors generated unnecessarily. */
220 #define ENGINE_CTRL_HAS_CTRL_FUNCTION 10
221 /* Returns a positive command number for the first command supported by the
222  * engine. Returns zero if no ctrl commands are supported. */
223 #define ENGINE_CTRL_GET_FIRST_CMD_TYPE 11
224 /* The 'long' argument specifies a command implemented by the engine, and the
225  * return value is the next command supported, or zero if there are no more. */
226 #define ENGINE_CTRL_GET_NEXT_CMD_TYPE 12
227 /* The 'void*' argument is a command name (cast from 'const char *'), and the
228  * return value is the command that corresponds to it. */
229 #define ENGINE_CTRL_GET_CMD_FROM_NAME 13
230 /* The next two allow a command to be converted into its corresponding string
231  * form. In each case, the 'long' argument supplies the command. In the NAME_LEN
232  * case, the return value is the length of the command name (not counting a
233  * trailing EOL). In the NAME case, the 'void*' argument must be a string buffer
234  * large enough, and it will be populated with the name of the command (WITH a
235  * trailing EOL). */
236 #define ENGINE_CTRL_GET_NAME_LEN_FROM_CMD 14
237 #define ENGINE_CTRL_GET_NAME_FROM_CMD 15
238 /* The next two are similar but give a "short description" of a command. */
239 #define ENGINE_CTRL_GET_DESC_LEN_FROM_CMD 16
240 #define ENGINE_CTRL_GET_DESC_FROM_CMD 17
241 /* With this command, the return value is the OR'd combination of
242  * ENGINE_CMD_FLAG_*** values that indicate what kind of input a given
243  * engine-specific ctrl command expects. */
244 #define ENGINE_CTRL_GET_CMD_FLAGS 18
245 
246 /* ENGINE implementations should start the numbering of their own control
247  * commands from this value. (ie. ENGINE_CMD_BASE, ENGINE_CMD_BASE + 1, etc). */
248 #define ENGINE_CMD_BASE 200
250 /* NB: These 2 nCipher "chil" control commands are deprecated, and their
251  * functionality is now available through ENGINE-specific control commands
252  * (exposed through the above-mentioned 'CMD'-handling). Code using these 2
253  * commands should be migrated to the more general command handling before these
254  * are removed. */
255 
256 /* Flags specific to the nCipher "chil" engine */
257 #define ENGINE_CTRL_CHIL_SET_FORKCHECK 100
258  /* Depending on the value of the (long)i argument, this sets or
259  * unsets the SimpleForkCheck flag in the CHIL API to enable or
260  * disable checking and workarounds for applications that fork().
261  */
262 #define ENGINE_CTRL_CHIL_NO_LOCKING 101
263  /* This prevents the initialisation function from providing mutex
264  * callbacks to the nCipher library. */
265 
266 /* If an ENGINE supports its own specific control commands and wishes the
267  * framework to handle the above 'ENGINE_CMD_***'-manipulation commands on its
268  * behalf, it should supply a null-terminated array of ENGINE_CMD_DEFN entries
269  * to ENGINE_set_cmd_defns(). It should also implement a ctrl() handler that
270  * supports the stated commands (ie. the "cmd_num" entries as described by the
271  * array). NB: The array must be ordered in increasing order of cmd_num.
272  * "null-terminated" means that the last ENGINE_CMD_DEFN element has cmd_num set
273  * to zero and/or cmd_name set to NULL. */
274 typedef struct ENGINE_CMD_DEFN_st
275  {
276  unsigned int cmd_num; /* The command number */
277  const char *cmd_name; /* The command name itself */
278  const char *cmd_desc; /* A short description of the command */
279  unsigned int cmd_flags; /* The input the command expects */
280  } ENGINE_CMD_DEFN;
282 /* Generic function pointer */
283 typedef int (*ENGINE_GEN_FUNC_PTR)(void);
284 /* Generic function pointer taking no arguments */
285 typedef int (*ENGINE_GEN_INT_FUNC_PTR)(ENGINE *);
286 /* Specific control function pointer */
287 typedef int (*ENGINE_CTRL_FUNC_PTR)(ENGINE *, int, long, void *, void (*f)(void));
288 /* Generic load_key function pointer */
289 typedef EVP_PKEY * (*ENGINE_LOAD_KEY_PTR)(ENGINE *, const char *,
290  UI_METHOD *ui_method, void *callback_data);
291 typedef int (*ENGINE_SSL_CLIENT_CERT_PTR)(ENGINE *, SSL *ssl,
292  STACK_OF(X509_NAME) *ca_dn, X509 **pcert, EVP_PKEY **pkey,
293  STACK_OF(X509) **pother, UI_METHOD *ui_method, void *callback_data);
294 /* These callback types are for an ENGINE's handler for cipher and digest logic.
295  * These handlers have these prototypes;
296  * int foo(ENGINE *e, const EVP_CIPHER **cipher, const int **nids, int nid);
297  * int foo(ENGINE *e, const EVP_MD **digest, const int **nids, int nid);
298  * Looking at how to implement these handlers in the case of cipher support, if
299  * the framework wants the EVP_CIPHER for 'nid', it will call;
300  * foo(e, &p_evp_cipher, NULL, nid); (return zero for failure)
301  * If the framework wants a list of supported 'nid's, it will call;
302  * foo(e, NULL, &p_nids, 0); (returns number of 'nids' or -1 for error)
303  */
304 /* Returns to a pointer to the array of supported cipher 'nid's. If the second
305  * parameter is non-NULL it is set to the size of the returned array. */
306 typedef int (*ENGINE_CIPHERS_PTR)(ENGINE *, const EVP_CIPHER **, const int **, int);
307 typedef int (*ENGINE_DIGESTS_PTR)(ENGINE *, const EVP_MD **, const int **, int);
308 typedef int (*ENGINE_PKEY_METHS_PTR)(ENGINE *, EVP_PKEY_METHOD **, const int **, int);
309 typedef int (*ENGINE_PKEY_ASN1_METHS_PTR)(ENGINE *, EVP_PKEY_ASN1_METHOD **, const int **, int);
310 /* STRUCTURE functions ... all of these functions deal with pointers to ENGINE
311  * structures where the pointers have a "structural reference". This means that
312  * their reference is to allowed access to the structure but it does not imply
313  * that the structure is functional. To simply increment or decrement the
314  * structural reference count, use ENGINE_by_id and ENGINE_free. NB: This is not
315  * required when iterating using ENGINE_get_next as it will automatically
316  * decrement the structural reference count of the "current" ENGINE and
317  * increment the structural reference count of the ENGINE it returns (unless it
318  * is NULL). */
319 
320 /* Get the first/last "ENGINE" type available. */
321 ENGINE *ENGINE_get_first(void);
322 ENGINE *ENGINE_get_last(void);
323 /* Iterate to the next/previous "ENGINE" type (NULL = end of the list). */
324 ENGINE *ENGINE_get_next(ENGINE *e);
325 ENGINE *ENGINE_get_prev(ENGINE *e);
326 /* Add another "ENGINE" type into the array. */
327 int ENGINE_add(ENGINE *e);
328 /* Remove an existing "ENGINE" type from the array. */
329 int ENGINE_remove(ENGINE *e);
330 /* Retrieve an engine from the list by its unique "id" value. */
331 ENGINE *ENGINE_by_id(const char *id);
332 /* Add all the built-in engines. */
333 void ENGINE_load_openssl(void);
334 void ENGINE_load_dynamic(void);
335 #ifndef OPENSSL_NO_STATIC_ENGINE
336 void ENGINE_load_4758cca(void);
337 void ENGINE_load_aep(void);
338 void ENGINE_load_atalla(void);
339 void ENGINE_load_chil(void);
340 void ENGINE_load_cswift(void);
341 void ENGINE_load_nuron(void);
342 void ENGINE_load_sureware(void);
343 void ENGINE_load_ubsec(void);
344 void ENGINE_load_padlock(void);
345 void ENGINE_load_capi(void);
346 #ifndef OPENSSL_NO_GMP
347 void ENGINE_load_gmp(void);
348 #endif
349 #ifndef OPENSSL_NO_GOST
350 void ENGINE_load_gost(void);
351 #endif
352 #endif
353 void ENGINE_load_cryptodev(void);
354 void ENGINE_load_rsax(void);
355 void ENGINE_load_rdrand(void);
356 void ENGINE_load_builtin_engines(void);
357 
358 /* Get and set global flags (ENGINE_TABLE_FLAG_***) for the implementation
359  * "registry" handling. */
360 unsigned int ENGINE_get_table_flags(void);
361 void ENGINE_set_table_flags(unsigned int flags);
362 
363 /* Manage registration of ENGINEs per "table". For each type, there are 3
364  * functions;
365  * ENGINE_register_***(e) - registers the implementation from 'e' (if it has one)
366  * ENGINE_unregister_***(e) - unregister the implementation from 'e'
367  * ENGINE_register_all_***() - call ENGINE_register_***() for each 'e' in the list
368  * Cleanup is automatically registered from each table when required, so
369  * ENGINE_cleanup() will reverse any "register" operations. */
370 
371 int ENGINE_register_RSA(ENGINE *e);
372 void ENGINE_unregister_RSA(ENGINE *e);
373 void ENGINE_register_all_RSA(void);
374 
375 int ENGINE_register_DSA(ENGINE *e);
376 void ENGINE_unregister_DSA(ENGINE *e);
377 void ENGINE_register_all_DSA(void);
378 
379 int ENGINE_register_ECDH(ENGINE *e);
380 void ENGINE_unregister_ECDH(ENGINE *e);
381 void ENGINE_register_all_ECDH(void);
382 
383 int ENGINE_register_ECDSA(ENGINE *e);
384 void ENGINE_unregister_ECDSA(ENGINE *e);
385 void ENGINE_register_all_ECDSA(void);
386 
387 int ENGINE_register_DH(ENGINE *e);
388 void ENGINE_unregister_DH(ENGINE *e);
389 void ENGINE_register_all_DH(void);
390 
391 int ENGINE_register_RAND(ENGINE *e);
392 void ENGINE_unregister_RAND(ENGINE *e);
393 void ENGINE_register_all_RAND(void);
394 
395 int ENGINE_register_STORE(ENGINE *e);
396 void ENGINE_unregister_STORE(ENGINE *e);
397 void ENGINE_register_all_STORE(void);
398 
399 int ENGINE_register_ciphers(ENGINE *e);
400 void ENGINE_unregister_ciphers(ENGINE *e);
401 void ENGINE_register_all_ciphers(void);
402 
403 int ENGINE_register_digests(ENGINE *e);
404 void ENGINE_unregister_digests(ENGINE *e);
405 void ENGINE_register_all_digests(void);
406 
407 int ENGINE_register_pkey_meths(ENGINE *e);
408 void ENGINE_unregister_pkey_meths(ENGINE *e);
410 
414 
415 /* These functions register all support from the above categories. Note, use of
416  * these functions can result in static linkage of code your application may not
417  * need. If you only need a subset of functionality, consider using more
418  * selective initialisation. */
419 int ENGINE_register_complete(ENGINE *e);
421 
422 /* Send parametrised control commands to the engine. The possibilities to send
423  * down an integer, a pointer to data or a function pointer are provided. Any of
424  * the parameters may or may not be NULL, depending on the command number. In
425  * actuality, this function only requires a structural (rather than functional)
426  * reference to an engine, but many control commands may require the engine be
427  * functional. The caller should be aware of trying commands that require an
428  * operational ENGINE, and only use functional references in such situations. */
429 int ENGINE_ctrl(ENGINE *e, int cmd, long i, void *p, void (*f)(void));
430 
431 /* This function tests if an ENGINE-specific command is usable as a "setting".
432  * Eg. in an application's config file that gets processed through
433  * ENGINE_ctrl_cmd_string(). If this returns zero, it is not available to
434  * ENGINE_ctrl_cmd_string(), only ENGINE_ctrl(). */
435 int ENGINE_cmd_is_executable(ENGINE *e, int cmd);
436 
437 /* This function works like ENGINE_ctrl() with the exception of taking a
438  * command name instead of a command number, and can handle optional commands.
439  * See the comment on ENGINE_ctrl_cmd_string() for an explanation on how to
440  * use the cmd_name and cmd_optional. */
441 int ENGINE_ctrl_cmd(ENGINE *e, const char *cmd_name,
442  long i, void *p, void (*f)(void), int cmd_optional);
443 
444 /* This function passes a command-name and argument to an ENGINE. The cmd_name
445  * is converted to a command number and the control command is called using
446  * 'arg' as an argument (unless the ENGINE doesn't support such a command, in
447  * which case no control command is called). The command is checked for input
448  * flags, and if necessary the argument will be converted to a numeric value. If
449  * cmd_optional is non-zero, then if the ENGINE doesn't support the given
450  * cmd_name the return value will be success anyway. This function is intended
451  * for applications to use so that users (or config files) can supply
452  * engine-specific config data to the ENGINE at run-time to control behaviour of
453  * specific engines. As such, it shouldn't be used for calling ENGINE_ctrl()
454  * functions that return data, deal with binary data, or that are otherwise
455  * supposed to be used directly through ENGINE_ctrl() in application code. Any
456  * "return" data from an ENGINE_ctrl() operation in this function will be lost -
457  * the return value is interpreted as failure if the return value is zero,
458  * success otherwise, and this function returns a boolean value as a result. In
459  * other words, vendors of 'ENGINE'-enabled devices should write ENGINE
460  * implementations with parameterisations that work in this scheme, so that
461  * compliant ENGINE-based applications can work consistently with the same
462  * configuration for the same ENGINE-enabled devices, across applications. */
463 int ENGINE_ctrl_cmd_string(ENGINE *e, const char *cmd_name, const char *arg,
464  int cmd_optional);
465 
466 /* These functions are useful for manufacturing new ENGINE structures. They
467  * don't address reference counting at all - one uses them to populate an ENGINE
468  * structure with personalised implementations of things prior to using it
469  * directly or adding it to the builtin ENGINE list in OpenSSL. These are also
470  * here so that the ENGINE structure doesn't have to be exposed and break binary
471  * compatibility! */
472 ENGINE *ENGINE_new(void);
473 int ENGINE_free(ENGINE *e);
474 int ENGINE_up_ref(ENGINE *e);
475 int ENGINE_set_id(ENGINE *e, const char *id);
476 int ENGINE_set_name(ENGINE *e, const char *name);
477 int ENGINE_set_RSA(ENGINE *e, const RSA_METHOD *rsa_meth);
478 int ENGINE_set_DSA(ENGINE *e, const DSA_METHOD *dsa_meth);
479 int ENGINE_set_ECDH(ENGINE *e, const ECDH_METHOD *ecdh_meth);
480 int ENGINE_set_ECDSA(ENGINE *e, const ECDSA_METHOD *ecdsa_meth);
481 int ENGINE_set_DH(ENGINE *e, const DH_METHOD *dh_meth);
482 int ENGINE_set_RAND(ENGINE *e, const RAND_METHOD *rand_meth);
483 int ENGINE_set_STORE(ENGINE *e, const STORE_METHOD *store_meth);
484 int ENGINE_set_destroy_function(ENGINE *e, ENGINE_GEN_INT_FUNC_PTR destroy_f);
486 int ENGINE_set_finish_function(ENGINE *e, ENGINE_GEN_INT_FUNC_PTR finish_f);
487 int ENGINE_set_ctrl_function(ENGINE *e, ENGINE_CTRL_FUNC_PTR ctrl_f);
488 int ENGINE_set_load_privkey_function(ENGINE *e, ENGINE_LOAD_KEY_PTR loadpriv_f);
489 int ENGINE_set_load_pubkey_function(ENGINE *e, ENGINE_LOAD_KEY_PTR loadpub_f);
491  ENGINE_SSL_CLIENT_CERT_PTR loadssl_f);
492 int ENGINE_set_ciphers(ENGINE *e, ENGINE_CIPHERS_PTR f);
493 int ENGINE_set_digests(ENGINE *e, ENGINE_DIGESTS_PTR f);
496 int ENGINE_set_flags(ENGINE *e, int flags);
497 int ENGINE_set_cmd_defns(ENGINE *e, const ENGINE_CMD_DEFN *defns);
498 /* These functions allow control over any per-structure ENGINE data. */
499 int ENGINE_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
501 int ENGINE_set_ex_data(ENGINE *e, int idx, void *arg);
502 void *ENGINE_get_ex_data(const ENGINE *e, int idx);
503 
504 /* This function cleans up anything that needs it. Eg. the ENGINE_add() function
505  * automatically ensures the list cleanup function is registered to be called
506  * from ENGINE_cleanup(). Similarly, all ENGINE_register_*** functions ensure
507  * ENGINE_cleanup() will clean up after them. */
508 void ENGINE_cleanup(void);
509 
510 /* These return values from within the ENGINE structure. These can be useful
511  * with functional references as well as structural references - it depends
512  * which you obtained. Using the result for functional purposes if you only
513  * obtained a structural reference may be problematic! */
514 const char *ENGINE_get_id(const ENGINE *e);
515 const char *ENGINE_get_name(const ENGINE *e);
516 const RSA_METHOD *ENGINE_get_RSA(const ENGINE *e);
517 const DSA_METHOD *ENGINE_get_DSA(const ENGINE *e);
518 const ECDH_METHOD *ENGINE_get_ECDH(const ENGINE *e);
519 const ECDSA_METHOD *ENGINE_get_ECDSA(const ENGINE *e);
520 const DH_METHOD *ENGINE_get_DH(const ENGINE *e);
521 const RAND_METHOD *ENGINE_get_RAND(const ENGINE *e);
522 const STORE_METHOD *ENGINE_get_STORE(const ENGINE *e);
530 ENGINE_CIPHERS_PTR ENGINE_get_ciphers(const ENGINE *e);
531 ENGINE_DIGESTS_PTR ENGINE_get_digests(const ENGINE *e);
534 const EVP_CIPHER *ENGINE_get_cipher(ENGINE *e, int nid);
535 const EVP_MD *ENGINE_get_digest(ENGINE *e, int nid);
536 const EVP_PKEY_METHOD *ENGINE_get_pkey_meth(ENGINE *e, int nid);
537 const EVP_PKEY_ASN1_METHOD *ENGINE_get_pkey_asn1_meth(ENGINE *e, int nid);
538 const EVP_PKEY_ASN1_METHOD *ENGINE_get_pkey_asn1_meth_str(ENGINE *e,
539  const char *str, int len);
540 const EVP_PKEY_ASN1_METHOD *ENGINE_pkey_asn1_find_str(ENGINE **pe,
541  const char *str, int len);
542 const ENGINE_CMD_DEFN *ENGINE_get_cmd_defns(const ENGINE *e);
543 int ENGINE_get_flags(const ENGINE *e);
544 
545 /* FUNCTIONAL functions. These functions deal with ENGINE structures
546  * that have (or will) be initialised for use. Broadly speaking, the
547  * structural functions are useful for iterating the list of available
548  * engine types, creating new engine types, and other "list" operations.
549  * These functions actually deal with ENGINEs that are to be used. As
550  * such these functions can fail (if applicable) when particular
551  * engines are unavailable - eg. if a hardware accelerator is not
552  * attached or not functioning correctly. Each ENGINE has 2 reference
553  * counts; structural and functional. Every time a functional reference
554  * is obtained or released, a corresponding structural reference is
555  * automatically obtained or released too. */
556 
557 /* Initialise a engine type for use (or up its reference count if it's
558  * already in use). This will fail if the engine is not currently
559  * operational and cannot initialise. */
560 int ENGINE_init(ENGINE *e);
561 /* Free a functional reference to a engine type. This does not require
562  * a corresponding call to ENGINE_free as it also releases a structural
563  * reference. */
564 int ENGINE_finish(ENGINE *e);
565 
566 /* The following functions handle keys that are stored in some secondary
567  * location, handled by the engine. The storage may be on a card or
568  * whatever. */
569 EVP_PKEY *ENGINE_load_private_key(ENGINE *e, const char *key_id,
570  UI_METHOD *ui_method, void *callback_data);
571 EVP_PKEY *ENGINE_load_public_key(ENGINE *e, const char *key_id,
572  UI_METHOD *ui_method, void *callback_data);
573 int ENGINE_load_ssl_client_cert(ENGINE *e, SSL *s,
574  STACK_OF(X509_NAME) *ca_dn, X509 **pcert, EVP_PKEY **ppkey,
575  STACK_OF(X509) **pother,
576  UI_METHOD *ui_method, void *callback_data);
577 
578 /* This returns a pointer for the current ENGINE structure that
579  * is (by default) performing any RSA operations. The value returned
580  * is an incremented reference, so it should be free'd (ENGINE_finish)
581  * before it is discarded. */
582 ENGINE *ENGINE_get_default_RSA(void);
583 /* Same for the other "methods" */
584 ENGINE *ENGINE_get_default_DSA(void);
585 ENGINE *ENGINE_get_default_ECDH(void);
586 ENGINE *ENGINE_get_default_ECDSA(void);
587 ENGINE *ENGINE_get_default_DH(void);
588 ENGINE *ENGINE_get_default_RAND(void);
589 /* These functions can be used to get a functional reference to perform
590  * ciphering or digesting corresponding to "nid". */
591 ENGINE *ENGINE_get_cipher_engine(int nid);
592 ENGINE *ENGINE_get_digest_engine(int nid);
593 ENGINE *ENGINE_get_pkey_meth_engine(int nid);
595 
596 /* This sets a new default ENGINE structure for performing RSA
597  * operations. If the result is non-zero (success) then the ENGINE
598  * structure will have had its reference count up'd so the caller
599  * should still free their own reference 'e'. */
600 int ENGINE_set_default_RSA(ENGINE *e);
601 int ENGINE_set_default_string(ENGINE *e, const char *def_list);
602 /* Same for the other "methods" */
603 int ENGINE_set_default_DSA(ENGINE *e);
604 int ENGINE_set_default_ECDH(ENGINE *e);
605 int ENGINE_set_default_ECDSA(ENGINE *e);
606 int ENGINE_set_default_DH(ENGINE *e);
607 int ENGINE_set_default_RAND(ENGINE *e);
608 int ENGINE_set_default_ciphers(ENGINE *e);
609 int ENGINE_set_default_digests(ENGINE *e);
610 int ENGINE_set_default_pkey_meths(ENGINE *e);
612 
613 /* The combination "set" - the flags are bitwise "OR"d from the
614  * ENGINE_METHOD_*** defines above. As with the "ENGINE_register_complete()"
615  * function, this function can result in unnecessary static linkage. If your
616  * application requires only specific functionality, consider using more
617  * selective functions. */
618 int ENGINE_set_default(ENGINE *e, unsigned int flags);
619 
620 void ENGINE_add_conf_module(void);
621 
622 /* Deprecated functions ... */
623 /* int ENGINE_clear_defaults(void); */
624 
625 /**************************/
626 /* DYNAMIC ENGINE SUPPORT */
627 /**************************/
628 
629 /* Binary/behaviour compatibility levels */
630 #define OSSL_DYNAMIC_VERSION (unsigned long)0x00020000
631 /* Binary versions older than this are too old for us (whether we're a loader or
632  * a loadee) */
633 #define OSSL_DYNAMIC_OLDEST (unsigned long)0x00020000
634 
635 /* When compiling an ENGINE entirely as an external shared library, loadable by
636  * the "dynamic" ENGINE, these types are needed. The 'dynamic_fns' structure
637  * type provides the calling application's (or library's) error functionality
638  * and memory management function pointers to the loaded library. These should
639  * be used/set in the loaded library code so that the loading application's
640  * 'state' will be used/changed in all operations. The 'static_state' pointer
641  * allows the loaded library to know if it shares the same static data as the
642  * calling application (or library), and thus whether these callbacks need to be
643  * set or not. */
644 typedef void *(*dyn_MEM_malloc_cb)(size_t);
645 typedef void *(*dyn_MEM_realloc_cb)(void *, size_t);
646 typedef void (*dyn_MEM_free_cb)(void *);
647 typedef struct st_dynamic_MEM_fns {
651  } dynamic_MEM_fns;
652 /* FIXME: Perhaps the memory and locking code (crypto.h) should declare and use
653  * these types so we (and any other dependant code) can simplify a bit?? */
654 typedef void (*dyn_lock_locking_cb)(int,int,const char *,int);
655 typedef int (*dyn_lock_add_lock_cb)(int*,int,int,const char *,int);
656 typedef struct CRYPTO_dynlock_value *(*dyn_dynlock_create_cb)(
657  const char *,int);
658 typedef void (*dyn_dynlock_lock_cb)(int,struct CRYPTO_dynlock_value *,
659  const char *,int);
660 typedef void (*dyn_dynlock_destroy_cb)(struct CRYPTO_dynlock_value *,
661  const char *,int);
662 typedef struct st_dynamic_LOCK_fns {
669 /* The top-level structure */
670 typedef struct st_dynamic_fns {
671  void *static_state;
672  const ERR_FNS *err_fns;
676  } dynamic_fns;
677 
678 /* The version checking function should be of this prototype. NB: The
679  * ossl_version value passed in is the OSSL_DYNAMIC_VERSION of the loading code.
680  * If this function returns zero, it indicates a (potential) version
681  * incompatibility and the loaded library doesn't believe it can proceed.
682  * Otherwise, the returned value is the (latest) version supported by the
683  * loading library. The loader may still decide that the loaded code's version
684  * is unsatisfactory and could veto the load. The function is expected to
685  * be implemented with the symbol name "v_check", and a default implementation
686  * can be fully instantiated with IMPLEMENT_DYNAMIC_CHECK_FN(). */
687 typedef unsigned long (*dynamic_v_check_fn)(unsigned long ossl_version);
688 #define IMPLEMENT_DYNAMIC_CHECK_FN() \
689  OPENSSL_EXPORT unsigned long v_check(unsigned long v); \
690  OPENSSL_EXPORT unsigned long v_check(unsigned long v) { \
691  if(v >= OSSL_DYNAMIC_OLDEST) return OSSL_DYNAMIC_VERSION; \
692  return 0; }
693 
694 /* This function is passed the ENGINE structure to initialise with its own
695  * function and command settings. It should not adjust the structural or
696  * functional reference counts. If this function returns zero, (a) the load will
697  * be aborted, (b) the previous ENGINE state will be memcpy'd back onto the
698  * structure, and (c) the shared library will be unloaded. So implementations
699  * should do their own internal cleanup in failure circumstances otherwise they
700  * could leak. The 'id' parameter, if non-NULL, represents the ENGINE id that
701  * the loader is looking for. If this is NULL, the shared library can choose to
702  * return failure or to initialise a 'default' ENGINE. If non-NULL, the shared
703  * library must initialise only an ENGINE matching the passed 'id'. The function
704  * is expected to be implemented with the symbol name "bind_engine". A standard
705  * implementation can be instantiated with IMPLEMENT_DYNAMIC_BIND_FN(fn) where
706  * the parameter 'fn' is a callback function that populates the ENGINE structure
707  * and returns an int value (zero for failure). 'fn' should have prototype;
708  * [static] int fn(ENGINE *e, const char *id); */
709 typedef int (*dynamic_bind_engine)(ENGINE *e, const char *id,
710  const dynamic_fns *fns);
711 #define IMPLEMENT_DYNAMIC_BIND_FN(fn) \
712  OPENSSL_EXPORT \
713  int bind_engine(ENGINE *e, const char *id, const dynamic_fns *fns); \
714  OPENSSL_EXPORT \
715  int bind_engine(ENGINE *e, const char *id, const dynamic_fns *fns) { \
716  if(ENGINE_get_static_state() == fns->static_state) goto skip_cbs; \
717  if(!CRYPTO_set_mem_functions(fns->mem_fns.malloc_cb, \
718  fns->mem_fns.realloc_cb, fns->mem_fns.free_cb)) \
719  return 0; \
720  CRYPTO_set_locking_callback(fns->lock_fns.lock_locking_cb); \
721  CRYPTO_set_add_lock_callback(fns->lock_fns.lock_add_lock_cb); \
722  CRYPTO_set_dynlock_create_callback(fns->lock_fns.dynlock_create_cb); \
723  CRYPTO_set_dynlock_lock_callback(fns->lock_fns.dynlock_lock_cb); \
724  CRYPTO_set_dynlock_destroy_callback(fns->lock_fns.dynlock_destroy_cb); \
725  if(!CRYPTO_set_ex_data_implementation(fns->ex_data_fns)) \
726  return 0; \
727  if(!ERR_set_implementation(fns->err_fns)) return 0; \
728  skip_cbs: \
729  if(!fn(e,id)) return 0; \
730  return 1; }
731 
732 /* If the loading application (or library) and the loaded ENGINE library share
733  * the same static data (eg. they're both dynamically linked to the same
734  * libcrypto.so) we need a way to avoid trying to set system callbacks - this
735  * would fail, and for the same reason that it's unnecessary to try. If the
736  * loaded ENGINE has (or gets from through the loader) its own copy of the
737  * libcrypto static data, we will need to set the callbacks. The easiest way to
738  * detect this is to have a function that returns a pointer to some static data
739  * and let the loading application and loaded ENGINE compare their respective
740  * values. */
741 void *ENGINE_get_static_state(void);
742 
743 #if defined(__OpenBSD__) || defined(__FreeBSD__) || defined(HAVE_CRYPTODEV)
744 void ENGINE_setup_bsd_cryptodev(void);
745 #endif
746 
747 /* BEGIN ERROR CODES */
748 /* The following lines are auto generated by the script mkerr.pl. Any changes
749  * made after this point may be overwritten when the script is next run.
750  */
753 /* Error codes for the ENGINE functions. */
755 /* Function codes. */
756 #define ENGINE_F_DYNAMIC_CTRL 180
757 #define ENGINE_F_DYNAMIC_GET_DATA_CTX 181
758 #define ENGINE_F_DYNAMIC_LOAD 182
759 #define ENGINE_F_DYNAMIC_SET_DATA_CTX 183
760 #define ENGINE_F_ENGINE_ADD 105
761 #define ENGINE_F_ENGINE_BY_ID 106
762 #define ENGINE_F_ENGINE_CMD_IS_EXECUTABLE 170
763 #define ENGINE_F_ENGINE_CTRL 142
764 #define ENGINE_F_ENGINE_CTRL_CMD 178
765 #define ENGINE_F_ENGINE_CTRL_CMD_STRING 171
766 #define ENGINE_F_ENGINE_FINISH 107
767 #define ENGINE_F_ENGINE_FREE_UTIL 108
768 #define ENGINE_F_ENGINE_GET_CIPHER 185
769 #define ENGINE_F_ENGINE_GET_DEFAULT_TYPE 177
770 #define ENGINE_F_ENGINE_GET_DIGEST 186
771 #define ENGINE_F_ENGINE_GET_NEXT 115
772 #define ENGINE_F_ENGINE_GET_PKEY_ASN1_METH 193
773 #define ENGINE_F_ENGINE_GET_PKEY_METH 192
774 #define ENGINE_F_ENGINE_GET_PREV 116
775 #define ENGINE_F_ENGINE_INIT 119
776 #define ENGINE_F_ENGINE_LIST_ADD 120
777 #define ENGINE_F_ENGINE_LIST_REMOVE 121
778 #define ENGINE_F_ENGINE_LOAD_PRIVATE_KEY 150
779 #define ENGINE_F_ENGINE_LOAD_PUBLIC_KEY 151
780 #define ENGINE_F_ENGINE_LOAD_SSL_CLIENT_CERT 194
781 #define ENGINE_F_ENGINE_NEW 122
782 #define ENGINE_F_ENGINE_REMOVE 123
783 #define ENGINE_F_ENGINE_SET_DEFAULT_STRING 189
784 #define ENGINE_F_ENGINE_SET_DEFAULT_TYPE 126
785 #define ENGINE_F_ENGINE_SET_ID 129
786 #define ENGINE_F_ENGINE_SET_NAME 130
787 #define ENGINE_F_ENGINE_TABLE_REGISTER 184
788 #define ENGINE_F_ENGINE_UNLOAD_KEY 152
789 #define ENGINE_F_ENGINE_UNLOCKED_FINISH 191
790 #define ENGINE_F_ENGINE_UP_REF 190
791 #define ENGINE_F_INT_CTRL_HELPER 172
792 #define ENGINE_F_INT_ENGINE_CONFIGURE 188
793 #define ENGINE_F_INT_ENGINE_MODULE_INIT 187
794 #define ENGINE_F_LOG_MESSAGE 141
796 /* Reason codes. */
797 #define ENGINE_R_ALREADY_LOADED 100
798 #define ENGINE_R_ARGUMENT_IS_NOT_A_NUMBER 133
799 #define ENGINE_R_CMD_NOT_EXECUTABLE 134
800 #define ENGINE_R_COMMAND_TAKES_INPUT 135
801 #define ENGINE_R_COMMAND_TAKES_NO_INPUT 136
802 #define ENGINE_R_CONFLICTING_ENGINE_ID 103
803 #define ENGINE_R_CTRL_COMMAND_NOT_IMPLEMENTED 119
804 #define ENGINE_R_DH_NOT_IMPLEMENTED 139
805 #define ENGINE_R_DSA_NOT_IMPLEMENTED 140
806 #define ENGINE_R_DSO_FAILURE 104
807 #define ENGINE_R_DSO_NOT_FOUND 132
808 #define ENGINE_R_ENGINES_SECTION_ERROR 148
809 #define ENGINE_R_ENGINE_CONFIGURATION_ERROR 102
810 #define ENGINE_R_ENGINE_IS_NOT_IN_LIST 105
811 #define ENGINE_R_ENGINE_SECTION_ERROR 149
812 #define ENGINE_R_FAILED_LOADING_PRIVATE_KEY 128
813 #define ENGINE_R_FAILED_LOADING_PUBLIC_KEY 129
814 #define ENGINE_R_FINISH_FAILED 106
815 #define ENGINE_R_GET_HANDLE_FAILED 107
816 #define ENGINE_R_ID_OR_NAME_MISSING 108
817 #define ENGINE_R_INIT_FAILED 109
818 #define ENGINE_R_INTERNAL_LIST_ERROR 110
819 #define ENGINE_R_INVALID_ARGUMENT 143
820 #define ENGINE_R_INVALID_CMD_NAME 137
821 #define ENGINE_R_INVALID_CMD_NUMBER 138
822 #define ENGINE_R_INVALID_INIT_VALUE 151
823 #define ENGINE_R_INVALID_STRING 150
824 #define ENGINE_R_NOT_INITIALISED 117
825 #define ENGINE_R_NOT_LOADED 112
826 #define ENGINE_R_NO_CONTROL_FUNCTION 120
827 #define ENGINE_R_NO_INDEX 144
828 #define ENGINE_R_NO_LOAD_FUNCTION 125
829 #define ENGINE_R_NO_REFERENCE 130
830 #define ENGINE_R_NO_SUCH_ENGINE 116
831 #define ENGINE_R_NO_UNLOAD_FUNCTION 126
832 #define ENGINE_R_PROVIDE_PARAMETERS 113
833 #define ENGINE_R_RSA_NOT_IMPLEMENTED 141
834 #define ENGINE_R_UNIMPLEMENTED_CIPHER 146
835 #define ENGINE_R_UNIMPLEMENTED_DIGEST 147
836 #define ENGINE_R_UNIMPLEMENTED_PUBLIC_KEY_METHOD 101
837 #define ENGINE_R_VERSION_INCOMPATIBILITY 145
838 
839 #ifdef __cplusplus
840 }
841 #endif
842 #endif