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|
/* openssl/engine.h */
/* Written by Geoff Thorpe (geoff@geoffthorpe.net) for the OpenSSL
* project 2000.
*/
/* ====================================================================
* Copyright (c) 1999 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).
*
*/
#ifndef HEADER_ENGINE_H
#define HEADER_ENGINE_H
#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
#include <openssl/rand.h>
#include <openssl/evp.h>
#include <openssl/symhacks.h>
#ifdef __cplusplus
extern "C" {
#endif
/* Fixups for missing algorithms */
#ifdef OPENSSL_NO_RSA
typedef void RSA_METHOD;
#endif
#ifdef OPENSSL_NO_DSA
typedef void DSA_METHOD;
#endif
#ifdef OPENSSL_NO_DH
typedef void DH_METHOD;
#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_BN_MOD_EXP (unsigned int)0x0010
#define ENGINE_METHOD_BN_MOD_EXP_CRT (unsigned int)0x0020
/* Obvious all-or-nothing cases. */
#define ENGINE_METHOD_ALL (unsigned int)0xFFFF
#define ENGINE_METHOD_NONE (unsigned int)0x0000
/* 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
/* 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
/* 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. */
/* 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;
/* As we're missing a BIGNUM_METHOD, we need a couple of locally
* defined function types that engines can implement. */
/* mod_exp operation, calculates; r = a ^ p mod m
* NB: ctx can be NULL, but if supplied, the implementation may use
* it if it wishes. */
typedef int (*BN_MOD_EXP)(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
const BIGNUM *m, BN_CTX *ctx);
/* private key operation for RSA, provided seperately in case other
* RSA implementations wish to use it. */
typedef int (*BN_MOD_EXP_CRT)(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
const BIGNUM *q, const BIGNUM *dmp1, const BIGNUM *dmq1,
const BIGNUM *iqmp, BN_CTX *ctx);
/* The list of "engine" types is a static array of (const ENGINE*)
* pointers (not dynamic because static is fine for now and we otherwise
* have to hook an appropriate load/unload function in to initialise and
* cleanup). */
struct engine_st;
typedef struct engine_st ENGINE;
/* Generic function pointer */
typedef int (*ENGINE_GEN_FUNC_PTR)();
/* 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)());
/* Generic load_key function pointer */
typedef EVP_PKEY * (*ENGINE_LOAD_KEY_PTR)(ENGINE *, const char *, const char *);
/* 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. */
ENGINE *ENGINE_get_first(void);
ENGINE *ENGINE_get_last(void);
/* Iterate to the next/previous "ENGINE" type (NULL = end of the list). */
ENGINE *ENGINE_get_next(ENGINE *e);
ENGINE *ENGINE_get_prev(ENGINE *e);
/* Add another "ENGINE" type into the array. */
int ENGINE_add(ENGINE *e);
/* Remove an existing "ENGINE" type from the array. */
int ENGINE_remove(ENGINE *e);
/* Retrieve an engine from the list by its unique "id" value. */
ENGINE *ENGINE_by_id(const char *id);
/* Add all the built-in engines. By default, only the OpenSSL software
engine is loaded */
void ENGINE_load_cswift(void);
void ENGINE_load_chil(void);
void ENGINE_load_atalla(void);
void ENGINE_load_nuron(void);
void ENGINE_load_ubsec(void);
void ENGINE_load_builtin_engines(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. */
int ENGINE_ctrl(ENGINE *e, int cmd, long i, void *p, void (*f)());
/* 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(). */
int ENGINE_cmd_is_executable(ENGINE *e, int cmd);
/* 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. */
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! */
ENGINE *ENGINE_new(void);
int ENGINE_free(ENGINE *e);
int ENGINE_set_id(ENGINE *e, const char *id);
int ENGINE_set_name(ENGINE *e, const char *name);
int ENGINE_set_RSA(ENGINE *e, const RSA_METHOD *rsa_meth);
int ENGINE_set_DSA(ENGINE *e, const DSA_METHOD *
|