engine.h

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/* openssl/engine.h */
/* Written by Geoff Thorpe ([e-mail]) 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
 *    [e-mail].
 *
 * 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
 * ([e-mail]).  This product includes software written by Tim
 * Hudson ([e-mail]).
 *
 */
/* ====================================================================
 * 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

#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