/* openssl/engine.h */

/* Written by Geoff Thorpe (geoff@geoffthorpe.net) for the OpenSSL

 * project 2000.

 */

/* ====================================================================

 * Copyright (c) 1999-2004 The OpenSSL Project.  All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 *

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer. 

 *

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in

 *    the documentation and/or other materials provided with the

 *    distribution.

 *

 * 3. All advertising materials mentioning features or use of this

 *    software must display the following acknowledgment:

 *    "This product includes software developed by the OpenSSL Project

 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"

 *

 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to

 *    endorse or promote products derived from this software without

 *    prior written permission. For written permission, please contact

 *    licensing@OpenSSL.org.

 *

 * 5. Products derived from this software may not be called "OpenSSL"

 *    nor may "OpenSSL" appear in their names without prior written

 *    permission of the OpenSSL Project.

 *

 * 6. Redistributions of any form whatsoever must retain the following

 *    acknowledgment:

 *    "This product includes software developed by the OpenSSL Project

 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"

 *

 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY

 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR

 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT

 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;

 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,

 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED

 * OF THE POSSIBILITY OF SUCH DAMAGE.

 * ====================================================================

 *

 * This product includes cryptographic software written by Eric Young

 * (eay@cryptsoft.com).  This product includes software written by Tim

 * Hudson (tjh@cryptsoft.com).

 *

 */

/* ====================================================================

 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.

 * ECDH support in OpenSSL originally developed by 

 * SUN MICROSYSTEMS, INC., and contributed to the OpenSSL project.

 */

#ifndef HEADER_ENGINE_H

#define HEADER_ENGINE_H

#if (defined(__SYMBIAN32__) && !defined(SYMBIAN))

#define SYMBIAN

#endif

#include <openssl/opensslconf.h>

#ifdef OPENSSL_NO_ENGINE

#error ENGINE is disabled.

#endif

#ifndef OPENSSL_NO_DEPRECATED

#include <openssl/bn.h>

#ifndef OPENSSL_NO_RSA

#include <openssl/rsa.h>

#endif

#ifndef OPENSSL_NO_DSA

#include <openssl/dsa.h>

#endif

#ifndef OPENSSL_NO_DH

#include <openssl/dh.h>

#endif

#ifndef OPENSSL_NO_ECDH

#include <openssl/ecdh.h>

#endif

#ifndef OPENSSL_NO_ECDSA

#include <openssl/ecdsa.h>

#endif

#include <openssl/rand.h>

#include <openssl/store.h>

#include <openssl/ui.h>

#include <openssl/err.h>

#endif

#include <openssl/ossl_typ.h>

#include <openssl/symhacks.h>

#ifdef  __cplusplus

extern "C" {

#endif

/* These flags are used to control combinations of algorithm (methods)

 * by bitwise "OR"ing. */

#define ENGINE_METHOD_RSA		(unsigned int)0x0001

#define ENGINE_METHOD_DSA		(unsigned int)0x0002

#define ENGINE_METHOD_DH		(unsigned int)0x0004

#define ENGINE_METHOD_RAND		(unsigned int)0x0008

#define ENGINE_METHOD_ECDH		(unsigned int)0x0010

#define ENGINE_METHOD_ECDSA		(unsigned int)0x0020

#define ENGINE_METHOD_CIPHERS		(unsigned int)0x0040

#define ENGINE_METHOD_DIGESTS		(unsigned int)0x0080

#define ENGINE_METHOD_STORE		(unsigned int)0x0100

/* Obvious all-or-nothing cases. */

#define ENGINE_METHOD_ALL		(unsigned int)0xFFFF

#define ENGINE_METHOD_NONE		(unsigned int)0x0000

/* This(ese) flag(s) controls behaviour of the ENGINE_TABLE mechanism used

 * internally to control registration of ENGINE implementations, and can be set

 * by ENGINE_set_table_flags(). The "NOINIT" flag prevents attempts to

 * initialise registered ENGINEs if they are not already initialised. */

#define ENGINE_TABLE_FLAG_NOINIT	(unsigned int)0x0001

/* ENGINE flags that can be set by ENGINE_set_flags(). */

/* #define ENGINE_FLAGS_MALLOCED	0x0001 */ /* Not used */

/* This flag is for ENGINEs that wish to handle the various 'CMD'-related

 * control commands on their own. Without this flag, ENGINE_ctrl() handles these

 * control commands on behalf of the ENGINE using their "cmd_defns" data. */

#define ENGINE_FLAGS_MANUAL_CMD_CTRL	(int)0x0002

/* This flag is for ENGINEs who return new duplicate structures when found via

 * "ENGINE_by_id()". When an ENGINE must store state (eg. if ENGINE_ctrl()

 * commands are called in sequence as part of some stateful process like

 * key-generation setup and execution), it can set this flag - then each attempt

 * to obtain the ENGINE will result in it being copied into a new structure.

 * Normally, ENGINEs don't declare this flag so ENGINE_by_id() just increments

 * the existing ENGINE's structural reference count. */

#define ENGINE_FLAGS_BY_ID_COPY		(int)0x0004

/* ENGINEs can support their own command types, and these flags are used in

 * ENGINE_CTRL_GET_CMD_FLAGS to indicate to the caller what kind of input each

 * command expects. Currently only numeric and string input is supported. If a

 * control command supports none of the _NUMERIC, _STRING, or _NO_INPUT options,

 * then it is regarded as an "internal" control command - and not for use in

 * config setting situations. As such, they're not available to the

 * ENGINE_ctrl_cmd_string() function, only raw ENGINE_ctrl() access. Changes to

 * this list of 'command types' should be reflected carefully in

 * ENGINE_cmd_is_executable() and ENGINE_ctrl_cmd_string(). */

/* accepts a 'long' input value (3rd parameter to ENGINE_ctrl) */

#define ENGINE_CMD_FLAG_NUMERIC		(unsigned int)0x0001

/* accepts string input (cast from 'void*' to 'const char *', 4th parameter to

 * ENGINE_ctrl) */

#define ENGINE_CMD_FLAG_STRING		(unsigned int)0x0002

/* Indicates that the control command takes *no* input. Ie. the control command

 * is unparameterised. */

#define ENGINE_CMD_FLAG_NO_INPUT	(unsigned int)0x0004

/* Indicates that the control command is internal. This control command won't

 * be shown in any output, and is only usable through the ENGINE_ctrl_cmd()

 * function. */

#define ENGINE_CMD_FLAG_INTERNAL	(unsigned int)0x0008

/* NB: These 3 control commands are deprecated and should not be used. ENGINEs

 * relying on these commands should compile conditional support for

 * compatibility (eg. if these symbols are defined) but should also migrate the

 * same functionality to their own ENGINE-specific control functions that can be

 * "discovered" by calling applications. The fact these control commands

 * wouldn't be "executable" (ie. usable by text-based config) doesn't change the

 * fact that application code can find and use them without requiring per-ENGINE

 * hacking. */

/* These flags are used to tell the ctrl function what should be done.

 * All command numbers are shared between all engines, even if some don't

 * make sense to some engines.  In such a case, they do nothing but return

 * the error ENGINE_R_CTRL_COMMAND_NOT_IMPLEMENTED. */

#define ENGINE_CTRL_SET_LOGSTREAM		1

#define ENGINE_CTRL_SET_PASSWORD_CALLBACK	2

#define ENGINE_CTRL_HUP				3 /* Close and reinitialise any

						     handles/connections etc. */

#define ENGINE_CTRL_SET_USER_INTERFACE          4 /* Alternative to callback */

#define ENGINE_CTRL_SET_CALLBACK_DATA           5 /* User-specific data, used

						     when calling the password

						     callback and the user

						     interface */

#define ENGINE_CTRL_LOAD_CONFIGURATION		6 /* Load a configuration, given

						     a string that represents a

						     file name or so */

#define ENGINE_CTRL_LOAD_SECTION		7 /* Load data from a given

						     section in the already loaded

						     configuration */

/* These control commands allow an application to deal with an arbitrary engine

 * in a dynamic way. Warn: Negative return values indicate errors FOR THESE

 * COMMANDS because zero is used to indicate 'end-of-list'. Other commands,

 * including ENGINE-specific command types, return zero for an error.

 *

 * An ENGINE can choose to implement these ctrl functions, and can internally

 * manage things however it chooses - it does so by setting the

 * ENGINE_FLAGS_MANUAL_CMD_CTRL flag (using ENGINE_set_flags()). Otherwise the

 * ENGINE_ctrl() code handles this on the ENGINE's behalf using the cmd_defns

 * data (set using ENGINE_set_cmd_defns()). This means an ENGINE's ctrl()

 * handler need only implement its own commands - the above "meta" commands will

 * be taken care of. */

/* Returns non-zero if the supplied ENGINE has a ctrl() handler. If "not", then

 * all the remaining control commands will return failure, so it is worth

 * checking this first if the caller is trying to "discover" the engine's

 * capabilities and doesn't want errors generated unnecessarily. */

#define ENGINE_CTRL_HAS_CTRL_FUNCTION		10

/* Returns a positive command number for the first command supported by the

 * engine. Returns zero if no ctrl commands are supported. */

#define ENGINE_CTRL_GET_FIRST_CMD_TYPE		11

/* The 'long' argument specifies a command implemented by the engine, and the

 * return value is the next command supported, or zero if there are no more. */

#define ENGINE_CTRL_GET_NEXT_CMD_TYPE		12

/* The 'void*' argument is a command name (cast from 'const char *'), and the

 * return value is the command that corresponds to it. */

#define ENGINE_CTRL_GET_CMD_FROM_NAME		13

/* The next two allow a command to be converted into its corresponding string

 * form. In each case, the 'long' argument supplies the command. In the NAME_LEN

 * case, the return value is the length of the command name (not counting a

 * trailing EOL). In the NAME case, the 'void*' argument must be a string buffer

 * large enough, and it will be populated with the name of the command (WITH a

 * trailing EOL). */

#define ENGINE_CTRL_GET_NAME_LEN_FROM_CMD	14

#define ENGINE_CTRL_GET_NAME_FROM_CMD		15

/* The next two are similar but give a "short description" of a command. */

#define ENGINE_CTRL_GET_DESC_LEN_FROM_CMD	16

#define ENGINE_CTRL_GET_DESC_FROM_CMD		17

/* With this command, the return value is the OR'd combination of

 * ENGINE_CMD_FLAG_*** values that indicate what kind of input a given

 * engine-specific ctrl command expects. */

#define ENGINE_CTRL_GET_CMD_FLAGS		18

/* ENGINE implementations should start the numbering of their own control

 * commands from this value. (ie. ENGINE_CMD_BASE, ENGINE_CMD_BASE + 1, etc). */

#define ENGINE_CMD_BASE				200

/* NB: These 2 nCipher "chil" control commands are deprecated, and their

 * functionality is now available through ENGINE-specific control commands

 * (exposed through the above-mentioned 'CMD'-handling). Code using these 2

 * commands should be migrated to the more general command handling before these

 * are removed. */

/* Flags specific to the nCipher "chil" engine */

#define ENGINE_CTRL_CHIL_SET_FORKCHECK		100

	/* Depending on the value of the (long)i argument, this sets or

	 * unsets the SimpleForkCheck flag in the CHIL API to enable or

	 * disable checking and workarounds for applications that fork().

	 */

#define ENGINE_CTRL_CHIL_NO_LOCKING		101

	/* This prevents the initialisation function from providing mutex

	 * callbacks to the nCipher library. */

/* If an ENGINE supports its own specific control commands and wishes the

 * framework to handle the above 'ENGINE_CMD_***'-manipulation commands on its

 * behalf, it should supply a null-terminated array of ENGINE_CMD_DEFN entries

 * to ENGINE_set_cmd_defns(). It should also implement a ctrl() handler that

 * supports the stated commands (ie. the "cmd_num" entries as described by the

 * array). NB: The array must be ordered in increasing order of cmd_num.

 * "null-terminated" means that the last ENGINE_CMD_DEFN element has cmd_num set

 * to zero and/or cmd_name set to NULL. */

typedef struct ENGINE_CMD_DEFN_st

	{

	unsigned int cmd_num; /* The command number */

	const char *cmd_name; /* The command name itself */

	const char *cmd_desc; /* A short description of the command */

	unsigned int cmd_flags; /* The input the command expects */

	} ENGINE_CMD_DEFN;

/* Generic function pointer */

typedef int (*ENGINE_GEN_FUNC_PTR)(void);

/* Generic function pointer taking no arguments */

typedef int (*ENGINE_GEN_INT_FUNC_PTR)(ENGINE *);

/* Specific control function pointer */

typedef int (*ENGINE_CTRL_FUNC_PTR)(ENGINE *, int, long, void *, void (*f)(void));

/* Generic load_key function pointer */

typedef EVP_PKEY * (*ENGINE_LOAD_KEY_PTR)(ENGINE *, const char *,

	UI_METHOD *ui_method, void *callback_data);

/* These callback types are for an ENGINE's handler for cipher and digest logic.

 * These handlers have these prototypes;

 *   int foo(ENGINE *e, const EVP_CIPHER **cipher, const int **nids, int nid);

 *   int foo(ENGINE *e, const EVP_MD **digest, const int **nids, int nid);

 * Looking at how to implement these handlers in the case of cipher support, if

 * the framework wants the EVP_CIPHER for 'nid', it will call;

 *   foo(e, &p_evp_cipher, NULL, nid);    (return zero for failure)

 * If the framework wants a list of supported 'nid's, it will call;

 *   foo(e, NULL, &p_nids, 0); (returns number of 'nids' or -1 for error)

 */

/* Returns to a pointer to the array of supported cipher 'nid's. If the second

 * parameter is non-NULL it is set to the size of the returned array. */

typedef int (*ENGINE_CIPHERS_PTR)(ENGINE *, const EVP_CIPHER **, const int **, int);

typedef int (*ENGINE_DIGESTS_PTR)(ENGINE *, const EVP_MD **, const int **, int);

/* STRUCTURE functions ... all of these functions deal with pointers to ENGINE

 * structures where the pointers have a "structural reference". This means that

 * their reference is to allowed access to the structure but it does not imply

 * that the structure is functional. To simply increment or decrement the

 * structural reference count, use ENGINE_by_id and ENGINE_free. NB: This is not

 * required when iterating using ENGINE_get_next as it will automatically

 * decrement the structural reference count of the "current" ENGINE and

 * increment the structural reference count of the ENGINE it returns (unless it

 * is NULL). */

/* Get the first/last "ENGINE" type available. */

IMPORT_C ENGINE *ENGINE_get_first(void);

IMPORT_C ENGINE *ENGINE_get_last(void);

/* Iterate to the next/previous "ENGINE" type (NULL = end of the list). */

IMPORT_C ENGINE *ENGINE_get_next(ENGINE *e);

IMPORT_C ENGINE *ENGINE_get_prev(ENGINE *e);

/* Add another "ENGINE" type into the array. */

IMPORT_C int ENGINE_add(ENGINE *e);

/* Remove an existing "ENGINE" type from the array. */

IMPORT_C int ENGINE_remove(ENGINE *e);

/* Retrieve an engine from the list by its unique "id" value. */

IMPORT_C ENGINE *ENGINE_by_id(const char *id);

/* Add all the built-in engines. */

IMPORT_C void ENGINE_load_openssl(void);

IMPORT_C void ENGINE_load_dynamic(void);

#ifndef OPENSSL_NO_STATIC_ENGINE

#ifndef OPENSSL_NO_GMP

void ENGINE_load_gmp(void);

#endif

#endif

IMPORT_C void ENGINE_load_cryptodev(void);

IMPORT_C void ENGINE_load_builtin_engines(void);

/* Get and set global flags (ENGINE_TABLE_FLAG_***) for the implementation

 * "registry" handling. */

IMPORT_C unsigned int ENGINE_get_table_flags(void);

IMPORT_C void ENGINE_set_table_flags(unsigned int flags);

/* Manage registration of ENGINEs per "table". For each type, there are 3

 * functions;

 *   ENGINE_register_***(e) - registers the implementation from 'e' (if it has one)

 *   ENGINE_unregister_***(e) - unregister the implementation from 'e'

 *   ENGINE_register_all_***() - call ENGINE_register_***() for each 'e' in the list

 * Cleanup is automatically registered from each table when required, so

 * ENGINE_cleanup() will reverse any "register" operations. */

IMPORT_C int ENGINE_register_RSA(ENGINE *e);

IMPORT_C void ENGINE_unregister_RSA(ENGINE *e);

IMPORT_C void ENGINE_register_all_RSA(void);

IMPORT_C int ENGINE_register_DSA(ENGINE *e);

IMPORT_C void ENGINE_unregister_DSA(ENGINE *e);

IMPORT_C void ENGINE_register_all_DSA(void);

IMPORT_C int ENGINE_register_DH(ENGINE *e);

IMPORT_C void ENGINE_unregister_DH(ENGINE *e);

IMPORT_C void ENGINE_register_all_DH(void);

IMPORT_C int ENGINE_register_RAND(ENGINE *e);

IMPORT_C void ENGINE_unregister_RAND(ENGINE *e);

IMPORT_C void ENGINE_register_all_RAND(void);

IMPORT_C int ENGINE_register_STORE(ENGINE *e);

IMPORT_C void ENGINE_unregister_STORE(ENGINE *e);

IMPORT_C void ENGINE_register_all_STORE(void);

IMPORT_C int ENGINE_register_ciphers(ENGINE *e);

IMPORT_C void ENGINE_unregister_ciphers(ENGINE *e);

IMPORT_C void ENGINE_register_all_ciphers(void);

IMPORT_C int ENGINE_register_digests(ENGINE *e);

IMPORT_C void ENGINE_unregister_digests(ENGINE *e);

IMPORT_C void ENGINE_register_all_digests(void);

/* These functions register all support from the above categories. Note, use of

 * these functions can result in static linkage of code your application may not

 * need. If you only need a subset of functionality, consider using more

 * selective initialisation. */

IMPORT_C int ENGINE_register_complete(ENGINE *e);

IMPORT_C int ENGINE_register_all_complete(void);

/* Send parametrised control commands to the engine. The possibilities to send

 * down an integer, a pointer to data or a function pointer are provided. Any of

 * the parameters may or may not be NULL, depending on the command number. In

 * actuality, this function only requires a structural (rather than functional)

 * reference to an engine, but many control commands may require the engine be

 * functional. The caller should be aware of trying commands that require an

 * operational ENGINE, and only use functional references in such situations. */

IMPORT_C int ENGINE_ctrl(ENGINE *e, int cmd, long i, void *p, void (*f)(void));

/* This function tests if an ENGINE-specific command is usable as a "setting".

 * Eg. in an application's config file that gets processed through

 * ENGINE_ctrl_cmd_string(). If this returns zero, it is not available to

 * ENGINE_ctrl_cmd_string(), only ENGINE_ctrl(). */

IMPORT_C int ENGINE_cmd_is_executable(ENGINE *e, int cmd);

/* This function works like ENGINE_ctrl() with the exception of taking a

 * command name instead of a command number, and can handle optional commands.

 * See the comment on ENGINE_ctrl_cmd_string() for an explanation on how to

 * use the cmd_name and cmd_optional. */

IMPORT_C int ENGINE_ctrl_cmd(ENGINE *e, const char *cmd_name,

        long i, void *p, void (*f)(void), int cmd_optional);

/* This function passes a command-name and argument to an ENGINE. The cmd_name

 * is converted to a command number and the control command is called using

 * 'arg' as an argument (unless the ENGINE doesn't support such a command, in

 * which case no control command is called). The command is checked for input

 * flags, and if necessary the argument will be converted to a numeric value. If

 * cmd_optional is non-zero, then if the ENGINE doesn't support the given

 * cmd_name the return value will be success anyway. This function is intended

 * for applications to use so that users (or config files) can supply

 * engine-specific config data to the ENGINE at run-time to control behaviour of

 * specific engines. As such, it shouldn't be used for calling ENGINE_ctrl()

 * functions that return data, deal with binary data, or that are otherwise

 * supposed to be used directly through ENGINE_ctrl() in application code. Any

 * "return" data from an ENGINE_ctrl() operation in this function will be lost -

 * the return value is interpreted as failure if the return value is zero,

 * success otherwise, and this function returns a boolean value as a result. In

 * other words, vendors of 'ENGINE'-enabled devices should write ENGINE

 * implementations with parameterisations that work in this scheme, so that

 * compliant ENGINE-based applications can work consistently with the same

 * configuration for the same ENGINE-enabled devices, across applications. */

IMPORT_C int ENGINE_ctrl_cmd_string(ENGINE *e, const char *cmd_name, const char *arg,

				int cmd_optional);

/* These functions are useful for manufacturing new ENGINE structures. They

 * don't address reference counting at all - one uses them to populate an ENGINE

 * structure with personalised implementations of things prior to using it

 * directly or adding it to the builtin ENGINE list in OpenSSL. These are also

 * here so that the ENGINE structure doesn't have to be exposed and break binary

 * compatibility! */

IMPORT_C ENGINE *ENGINE_new(void);

IMPORT_C int ENGINE_free(ENGINE *e);

IMPORT_C int ENGINE_up_ref(ENGINE *e);

IMPORT_C int ENGINE_set_id(ENGINE *e, const char *id);

IMPORT_C int ENGINE_set_name(ENGINE *e, const char *name);

IMPORT_C int ENGINE_set_RSA(ENGINE *e, const RSA_METHOD *rsa_meth);

IMPORT_C int ENGINE_set_DSA(ENGINE *e, const DSA_METHOD *dsa_meth);

IMPORT_C int ENGINE_set_DH(ENGINE *e, const DH_METHOD *dh_meth);

IMPORT_C int ENGINE_set_RAND(ENGINE *e, const RAND_METHOD *rand_meth);

IMPORT_C int ENGINE_set_STORE(ENGINE *e, const STORE_METHOD *store_meth);

IMPORT_C int ENGINE_set_destroy_function(ENGINE *e, ENGINE_GEN_INT_FUNC_PTR destroy_f);

IMPORT_C int ENGINE_set_init_function(ENGINE *e, ENGINE_GEN_INT_FUNC_PTR init_f);

IMPORT_C int ENGINE_set_finish_function(ENGINE *e, ENGINE_GEN_INT_FUNC_PTR finish_f);

IMPORT_C int ENGINE_set_ctrl_function(ENGINE *e, ENGINE_CTRL_FUNC_PTR ctrl_f);

IMPORT_C int ENGINE_set_load_privkey_function(ENGINE *e, ENGINE_LOAD_KEY_PTR loadpriv_f);

IMPORT_C int ENGINE_set_load_pubkey_function(ENGINE *e, ENGINE_LOAD_KEY_PTR loadpub_f);

IMPORT_C int ENGINE_set_ciphers(ENGINE *e, ENGINE_CIPHERS_PTR f);

IMPORT_C int ENGINE_set_digests(ENGINE *e, ENGINE_DIGESTS_PTR f);

IMPORT_C int ENGINE_set_flags(ENGINE *e, int flags);

IMPORT_C int ENGINE_set_cmd_defns(ENGINE *e, const ENGINE_CMD_DEFN *defns);

/* These functions allow control over any per-structure ENGINE data. */

IMPORT_C int ENGINE_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,

		CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func);

IMPORT_C int ENGINE_set_ex_data(ENGINE *e, int idx, void *arg);

IMPORT_C void *ENGINE_get_ex_data(const ENGINE *e, int idx);

/* This function cleans up anything that needs it. Eg. the ENGINE_add() function

 * automatically ensures the list cleanup function is registered to be called

 * from ENGINE_cleanup(). Similarly, all ENGINE_register_*** functions ensure

 * ENGINE_cleanup() will clean up after them. */

IMPORT_C void ENGINE_cleanup(void);

/* These return values from within the ENGINE structure. These can be useful

 * with functional references as well as structural references - it depends

 * which you obtained. Using the result for functional purposes if you only

 * obtained a structural reference may be problematic! */

IMPORT_C const char *ENGINE_get_id(const ENGINE *e);

IMPORT_C const char *ENGINE_get_name(const ENGINE *e);

IMPORT_C const RSA_METHOD *ENGINE_get_RSA(const ENGINE *e);

IMPORT_C const DSA_METHOD *ENGINE_get_DSA(const ENGINE *e);

IMPORT_C const DH_METHOD *ENGINE_get_DH(const ENGINE *e);

IMPORT_C const RAND_METHOD *ENGINE_get_RAND(const ENGINE *e);

IMPORT_C const STORE_METHOD *ENGINE_get_STORE(const ENGINE *e);

IMPORT_C ENGINE_GEN_INT_FUNC_PTR ENGINE_get_destroy_function(const ENGINE *e);

IMPORT_C ENGINE_GEN_INT_FUNC_PTR ENGINE_get_init_function(const ENGINE *e);

IMPORT_C ENGINE_GEN_INT_FUNC_PTR ENGINE_get_finish_function(const ENGINE *e);

IMPORT_C ENGINE_CTRL_FUNC_PTR ENGINE_get_ctrl_function(const ENGINE *e);

IMPORT_C ENGINE_LOAD_KEY_PTR ENGINE_get_load_privkey_function(const ENGINE *e);

IMPORT_C ENGINE_LOAD_KEY_PTR ENGINE_get_load_pubkey_function(const ENGINE *e);

IMPORT_C ENGINE_CIPHERS_PTR ENGINE_get_ciphers(const ENGINE *e);

IMPORT_C ENGINE_DIGESTS_PTR ENGINE_get_digests(const ENGINE *e);

IMPORT_C const EVP_CIPHER *ENGINE_get_cipher(ENGINE *e, int nid);

IMPORT_C const EVP_MD *ENGINE_get_digest(ENGINE *e, int nid);

IMPORT_C const ENGINE_CMD_DEFN *ENGINE_get_cmd_defns(const ENGINE *e);

IMPORT_C int ENGINE_get_flags(const ENGINE *e);

/* FUNCTIONAL functions. These functions deal with ENGINE structures

 * that have (or will) be initialised for use. Broadly speaking, the

 * structural functions are useful for iterating the list of available

 * engine types, creating new engine types, and other "list" operations.

 * These functions actually deal with ENGINEs that are to be used. As

 * such these functions can fail (if applicable) when particular

 * engines are unavailable - eg. if a hardware accelerator is not

 * attached or not functioning correctly. Each ENGINE has 2 reference

 * counts; structural and functional. Every time a functional reference

 * is obtained or released, a corresponding structural reference is

 * automatically obtained or released too. */

/* Initialise a engine type for use (or up its reference count if it's

 * already in use). This will fail if the engine is not currently

 * operational and cannot initialise. */

IMPORT_C int ENGINE_init(ENGINE *e);

/* Free a functional reference to a engine type. This does not require

 * a corresponding call to ENGINE_free as it also releases a structural

 * reference. */

IMPORT_C int ENGINE_finish(ENGINE *e);

/* The following functions handle keys that are stored in some secondary

 * location, handled by the engine.  The storage may be on a card or

 * whatever. */

IMPORT_C EVP_PKEY *ENGINE_load_private_key(ENGINE *e, const char *key_id,

	UI_METHOD *ui_method, void *callback_data);

IMPORT_C EVP_PKEY *ENGINE_load_public_key(ENGINE *e, const char *key_id,

	UI_METHOD *ui_method, void *callback_data);

/* This returns a pointer for the current ENGINE structure that

 * is (by default) performing any RSA operations. The value returned

 * is an incremented reference, so it should be free'd (ENGINE_finish)

 * before it is discarded. */

IMPORT_C ENGINE *ENGINE_get_default_RSA(void);

/* Same for the other "methods" */

IMPORT_C ENGINE *ENGINE_get_default_DSA(void);

IMPORT_C ENGINE *ENGINE_get_default_DH(void);

IMPORT_C ENGINE *ENGINE_get_default_RAND(void);

/* These functions can be used to get a functional reference to perform

 * ciphering or digesting corresponding to "nid". */

IMPORT_C ENGINE *ENGINE_get_cipher_engine(int nid);