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 /*
  * Copyright 2000-2022 The OpenSSL Project Authors. All Rights Reserved.
  * Copyright (c) 2002, Oracle and/or its affiliates. All rights reserved
  *
  * Licensed under the Apache License 2.0 (the "License").  You may not use
  * this file except in compliance with the License.  You can obtain a copy
  * in the file LICENSE in the source distribution or at
  * https://www.openssl.org/source/license.html
  */
 
 #ifndef OPENSSL_ENGINE_H
 #define OPENSSL_ENGINE_H
 #pragma once
 
 #include <openssl/macros.h>
 #ifndef OPENSSL_NO_DEPRECATED_3_0
 #define HEADER_ENGINE_H
 #endif
 
 #include <openssl/opensslconf.h>
 
 #ifndef OPENSSL_NO_ENGINE
 #ifndef OPENSSL_NO_DEPRECATED_1_1_0
 #include <openssl/bn.h>
 #include <openssl/rsa.h>
 #include <openssl/dsa.h>
 #include <openssl/dh.h>
 #include <openssl/ec.h>
 #include <openssl/rand.h>
 #include <openssl/ui.h>
 #include <openssl/err.h>
 #endif
 #include <openssl/types.h>
 #include <openssl/symhacks.h>
 #include <openssl/x509.h>
 #include <openssl/engineerr.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_CIPHERS (unsigned int)0x0040
 #define ENGINE_METHOD_DIGESTS (unsigned int)0x0080
 #define ENGINE_METHOD_PKEY_METHS (unsigned int)0x0200
 #define ENGINE_METHOD_PKEY_ASN1_METHS (unsigned int)0x0400
 #define ENGINE_METHOD_EC (unsigned int)0x0800
 /* 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(). */
 /* Not used */
 /* #define ENGINE_FLAGS_MALLOCED        0x0001 */
 
 /*
  * 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
 
 /*
  * This flag is for an ENGINE that does not want its methods registered as
  * part of ENGINE_register_all_complete() for example if the methods are not
  * usable as default methods.
  */
 
 #define ENGINE_FLAGS_NO_REGISTER_ALL (int)0x0008
 
 /*
  * 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);
 typedef int (*ENGINE_SSL_CLIENT_CERT_PTR)(ENGINE *, SSL *ssl,
     STACK_OF(X509_NAME) *ca_dn,
     X509 **pcert, EVP_PKEY **pkey,
     STACK_OF(X509) **pother,
     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);
 typedef int (*ENGINE_PKEY_METHS_PTR)(ENGINE *, EVP_PKEY_METHOD **,
     const int **, int);
 typedef int (*ENGINE_PKEY_ASN1_METHS_PTR)(ENGINE *, EVP_PKEY_ASN1_METHOD **,
     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. */
 #ifndef OPENSSL_NO_DEPRECATED_3_0
 OSSL_DEPRECATEDIN_3_0 ENGINE *ENGINE_get_first(void);
 OSSL_DEPRECATEDIN_3_0 ENGINE *ENGINE_get_last(void);
 #endif
 /* Iterate to the next/previous "ENGINE" type (NULL = end of the list). */
 #ifndef OPENSSL_NO_DEPRECATED_3_0
 OSSL_DEPRECATEDIN_3_0 ENGINE *ENGINE_get_next(ENGINE *e);
 OSSL_DEPRECATEDIN_3_0 ENGINE *ENGINE_get_prev(ENGINE *e);
 #endif
 /* Add another "ENGINE" type into the array. */
 #ifndef OPENSSL_NO_DEPRECATED_3_0
 OSSL_DEPRECATEDIN_3_0 int ENGINE_add(ENGINE *e);
 #endif
 /* Remove an existing "ENGINE" type from the array. */
 #ifndef OPENSSL_NO_DEPRECATED_3_0
 OSSL_DEPRECATEDIN_3_0 int ENGINE_remove(ENGINE *e);
 #endif
 /* Retrieve an engine from the list by its unique "id" value. */
 #ifndef OPENSSL_NO_DEPRECATED_3_0
 OSSL_DEPRECATEDIN_3_0 ENGINE *ENGINE_by_id(const char *id);
 #endif
 
 #ifndef OPENSSL_NO_DEPRECATED_1_1_0
 #define ENGINE_load_openssl() \
     OPENSSL_init_crypto(OPENSSL_INIT_ENGINE_OPENSSL, NULL)
 #define ENGINE_load_dynamic() \
     OPENSSL_init_crypto(OPENSSL_INIT_ENGINE_DYNAMIC, NULL)
 #ifndef OPENSSL_NO_STATIC_ENGINE
 #define ENGINE_load_padlock() \
     OPENSSL_init_crypto(OPENSSL_INIT_ENGINE_PADLOCK, NULL)
 #define ENGINE_load_capi() \
     OPENSSL_init_crypto(OPENSSL_INIT_ENGINE_CAPI, NULL)
 #define ENGINE_load_afalg() \
     OPENSSL_init_crypto(OPENSSL_INIT_ENGINE_AFALG, NULL)
 #endif
 #define ENGINE_load_cryptodev() \
     OPENSSL_init_crypto(OPENSSL_INIT_ENGINE_CRYPTODEV, NULL)
 #define ENGINE_load_rdrand() \
     OPENSSL_init_crypto(OPENSSL_INIT_ENGINE_RDRAND, NULL)
 #endif
 #ifndef OPENSSL_NO_DEPRECATED_3_0
 OSSL_DEPRECATEDIN_3_0 void ENGINE_load_builtin_engines(void);
 #endif
 
 /*
  * Get and set global flags (ENGINE_TABLE_FLAG_***) for the implementation
  * "registry" handling.
  */
 #ifndef OPENSSL_NO_DEPRECATED_3_0
 OSSL_DEPRECATEDIN_3_0 unsigned int ENGINE_get_table_flags(void);
 OSSL_DEPRECATEDIN_3_0 void ENGINE_set_table_flags(unsigned int flags);
 #endif
 
 /*- 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.
  */
 #ifndef OPENSSL_NO_DEPRECATED_3_0
 OSSL_DEPRECATEDIN_3_0 int ENGINE_register_RSA(ENGINE *e);
 OSSL_DEPRECATEDIN_3_0 void ENGINE_unregister_RSA(ENGINE *e);
 OSSL_DEPRECATEDIN_3_0 void ENGINE_register_all_RSA(void);
 OSSL_DEPRECATEDIN_3_0 int ENGINE_register_DSA(ENGINE *e);
 OSSL_DEPRECATEDIN_3_0 void ENGINE_unregister_DSA(ENGINE *e);
 OSSL_DEPRECATEDIN_3_0 void ENGINE_register_all_DSA(void);
 OSSL_DEPRECATEDIN_3_0 int ENGINE_register_EC(ENGINE *e);
 OSSL_DEPRECATEDIN_3_0 void ENGINE_unregister_EC(ENGINE *e);
 OSSL_DEPRECATEDIN_3_0 void ENGINE_register_all_EC(void);
 OSSL_DEPRECATEDIN_3_0 int ENGINE_register_DH(ENGINE *e);
 OSSL_DEPRECATEDIN_3_0 void ENGINE_unregister_DH(ENGINE *e);
 OSSL_DEPRECATEDIN_3_0 void ENGINE_register_all_DH(void);
 OSSL_DEPRECATEDIN_3_0 int ENGINE_register_RAND(ENGINE *e);
 OSSL_DEPRECATEDIN_3_0 void ENGINE_unregister_RAND(ENGINE *e);
 OSSL_DEPRECATEDIN_3_0 void ENGINE_register_all_RAND(void);
 OSSL_DEPRECATEDIN_3_0 int ENGINE_register_ciphers(ENGINE *e);
 OSSL_DEPRECATEDIN_3_0 void ENGINE_unregister_ciphers(ENGINE *e);
 OSSL_DEPRECATEDIN_3_0 void ENGINE_register_all_ciphers(void);
 OSSL_DEPRECATEDIN_3_0 int ENGINE_register_digests(ENGINE *e);
 OSSL_DEPRECATEDIN_3_0 void ENGINE_unregister_digests(ENGINE *e);
 OSSL_DEPRECATEDIN_3_0 void ENGINE_register_all_digests(void);
 OSSL_DEPRECATEDIN_3_0 int ENGINE_register_pkey_meths(ENGINE *e);
 OSSL_DEPRECATEDIN_3_0 void ENGINE_unregister_pkey_meths(ENGINE *e);
 OSSL_DEPRECATEDIN_3_0 void ENGINE_register_all_pkey_meths(void);
 OSSL_DEPRECATEDIN_3_0 int ENGINE_register_pkey_asn1_meths(ENGINE *e);
 OSSL_DEPRECATEDIN_3_0 void ENGINE_unregister_pkey_asn1_meths(ENGINE *e);
 OSSL_DEPRECATEDIN_3_0 void ENGINE_register_all_pkey_asn1_meths(void);
 #endif
 
 /*
  * 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.
  */
 #ifndef OPENSSL_NO_DEPRECATED_3_0
 OSSL_DEPRECATEDIN_3_0 int ENGINE_register_complete(ENGINE *e);
 OSSL_DEPRECATEDIN_3_0 int ENGINE_register_all_complete(void);
 #endif
 
 /*
  * Send parameterised 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.
  */
 #ifndef OPENSSL_NO_DEPRECATED_3_0
 OSSL_DEPRECATEDIN_3_0 int ENGINE_ctrl(ENGINE *e, int cmd, long i, void *p,
     void (*f)(void));
 #endif
 
 /*
  * 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().
  */
 #ifndef OPENSSL_NO_DEPRECATED_3_0
 OSSL_DEPRECATEDIN_3_0 int ENGINE_cmd_is_executable(ENGINE *e, int cmd);
 #endif
 
 /*
  * 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.
  */
 #ifndef OPENSSL_NO_DEPRECATED_3_0
 OSSL_DEPRECATEDIN_3_0 int ENGINE_ctrl_cmd(ENGINE *e, const char *cmd_name,
     long i, void *p, void (*f)(void),
     int cmd_optional);
 #endif
 
 /*
  * 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.
  */
 #ifndef OPENSSL_NO_DEPRECATED_3_0
 OSSL_DEPRECATEDIN_3_0
 int ENGINE_ctrl_cmd_string(ENGINE *e, const char *cmd_name, const char *arg,
     int cmd_optional);
 #endif
 
 /*
  * 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!
  */
 #ifndef OPENSSL_NO_DEPRECATED_3_0
 OSSL_DEPRECATEDIN_3_0 ENGINE *ENGINE_new(void);
 OSSL_DEPRECATEDIN_3_0 int ENGINE_free(ENGINE *e);
 OSSL_DEPRECATEDIN_3_0 int ENGINE_up_ref(ENGINE *e);
 OSSL_DEPRECATEDIN_3_0 int ENGINE_set_id(ENGINE *e, const char *id);
 OSSL_DEPRECATEDIN_3_0 int ENGINE_set_name(ENGINE *e, const char *name);
 OSSL_DEPRECATEDIN_3_0 int ENGINE_set_RSA(ENGINE *e, const RSA_METHOD *rsa_meth);
 OSSL_DEPRECATEDIN_3_0 int ENGINE_set_DSA(ENGINE *e, const DSA_METHOD *dsa_meth);
 OSSL_DEPRECATEDIN_3_0 int ENGINE_set_EC(ENGINE *e, const EC_KEY_METHOD *ecdsa_meth);
 OSSL_DEPRECATEDIN_3_0 int ENGINE_set_DH(ENGINE *e, const DH_METHOD *dh_meth);
 OSSL_DEPRECATEDIN_3_0 int ENGINE_set_RAND(ENGINE *e, const RAND_METHOD *rand_meth);
 OSSL_DEPRECATEDIN_3_0
 int ENGINE_set_destroy_function(ENGINE *e, ENGINE_GEN_INT_FUNC_PTR destroy_f);
 OSSL_DEPRECATEDIN_3_0
 int ENGINE_set_init_function(ENGINE *e, ENGINE_GEN_INT_FUNC_PTR init_f);
 OSSL_DEPRECATEDIN_3_0
 int ENGINE_set_finish_function(ENGINE *e, ENGINE_GEN_INT_FUNC_PTR finish_f);
 OSSL_DEPRECATEDIN_3_0
 int ENGINE_set_ctrl_function(ENGINE *e, ENGINE_CTRL_FUNC_PTR ctrl_f);
 OSSL_DEPRECATEDIN_3_0
 int ENGINE_set_load_privkey_function(ENGINE *e, ENGINE_LOAD_KEY_PTR loadpriv_f);
 OSSL_DEPRECATEDIN_3_0
 int ENGINE_set_load_pubkey_function(ENGINE *e, ENGINE_LOAD_KEY_PTR loadpub_f);
 OSSL_DEPRECATEDIN_3_0
 int ENGINE_set_load_ssl_client_cert_function(ENGINE *e,
     ENGINE_SSL_CLIENT_CERT_PTR loadssl_f);
 OSSL_DEPRECATEDIN_3_0
 int ENGINE_set_ciphers(ENGINE *e, ENGINE_CIPHERS_PTR f);
 OSSL_DEPRECATEDIN_3_0
 int ENGINE_set_digests(ENGINE *e, ENGINE_DIGESTS_PTR f);
 OSSL_DEPRECATEDIN_3_0
 int ENGINE_set_pkey_meths(ENGINE *e, ENGINE_PKEY_METHS_PTR f);
 OSSL_DEPRECATEDIN_3_0
 int ENGINE_set_pkey_asn1_meths(ENGINE *e, ENGINE_PKEY_ASN1_METHS_PTR f);
 OSSL_DEPRECATEDIN_3_0 int ENGINE_set_flags(ENGINE *e, int flags);
 OSSL_DEPRECATEDIN_3_0 int ENGINE_set_cmd_defns(ENGINE *e,
     const ENGINE_CMD_DEFN *defns);
 #endif
 /* These functions allow control over any per-structure ENGINE data. */
 #define ENGINE_get_ex_new_index(l, p, newf, dupf, freef) \
     CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_ENGINE, l, p, newf, dupf, freef)
 #ifndef OPENSSL_NO_DEPRECATED_3_0
 OSSL_DEPRECATEDIN_3_0 int ENGINE_set_ex_data(ENGINE *e, int idx, void *arg);
 OSSL_DEPRECATEDIN_3_0 void *ENGINE_get_ex_data(const ENGINE *e, int idx);
 #endif
 
 #ifndef OPENSSL_NO_DEPRECATED_1_1_0
 /*
  * This function previously cleaned up anything that needs it. Auto-deinit will
  * now take care of it so it is no longer required to call this function.
  */
 #define ENGINE_cleanup() \
     while (0)            \
     continue
 #endif
 
 /*
  * 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!
  */
 #ifndef OPENSSL_NO_DEPRECATED_3_0
 OSSL_DEPRECATEDIN_3_0 const char *ENGINE_get_id(const ENGINE *e);
 OSSL_DEPRECATEDIN_3_0 const char *ENGINE_get_name(const ENGINE *e);
 OSSL_DEPRECATEDIN_3_0 const RSA_METHOD *ENGINE_get_RSA(const ENGINE *e);
 OSSL_DEPRECATEDIN_3_0 const DSA_METHOD *ENGINE_get_DSA(const ENGINE *e);
 OSSL_DEPRECATEDIN_3_0 const EC_KEY_METHOD *ENGINE_get_EC(const ENGINE *e);
 OSSL_DEPRECATEDIN_3_0 const DH_METHOD *ENGINE_get_DH(const ENGINE *e);
 OSSL_DEPRECATEDIN_3_0 const RAND_METHOD *ENGINE_get_RAND(const ENGINE *e);
 OSSL_DEPRECATEDIN_3_0
 ENGINE_GEN_INT_FUNC_PTR ENGINE_get_destroy_function(const ENGINE *e);
 OSSL_DEPRECATEDIN_3_0
 ENGINE_GEN_INT_FUNC_PTR ENGINE_get_init_function(const ENGINE *e);
 OSSL_DEPRECATEDIN_3_0
 ENGINE_GEN_INT_FUNC_PTR ENGINE_get_finish_function(const ENGINE *e);
 OSSL_DEPRECATEDIN_3_0
 ENGINE_CTRL_FUNC_PTR ENGINE_get_ctrl_function(const ENGINE *e);
 OSSL_DEPRECATEDIN_3_0
 ENGINE_LOAD_KEY_PTR ENGINE_get_load_privkey_function(const ENGINE *e);
 OSSL_DEPRECATEDIN_3_0
 ENGINE_LOAD_KEY_PTR ENGINE_get_load_pubkey_function(const ENGINE *e);
 OSSL_DEPRECATEDIN_3_0
 ENGINE_SSL_CLIENT_CERT_PTR ENGINE_get_ssl_client_cert_function(const ENGINE *e);
 OSSL_DEPRECATEDIN_3_0
 ENGINE_CIPHERS_PTR ENGINE_get_ciphers(const ENGINE *e);
 OSSL_DEPRECATEDIN_3_0
 ENGINE_DIGESTS_PTR ENGINE_get_digests(const ENGINE *e);
 OSSL_DEPRECATEDIN_3_0
 ENGINE_PKEY_METHS_PTR ENGINE_get_pkey_meths(const ENGINE *e);
 OSSL_DEPRECATEDIN_3_0
 ENGINE_PKEY_ASN1_METHS_PTR ENGINE_get_pkey_asn1_meths(const ENGINE *e);
 OSSL_DEPRECATEDIN_3_0
 const EVP_CIPHER *ENGINE_get_cipher(ENGINE *e, int nid);
 OSSL_DEPRECATEDIN_3_0
 const EVP_MD *ENGINE_get_digest(ENGINE *e, int nid);
 OSSL_DEPRECATEDIN_3_0
 const EVP_PKEY_METHOD *ENGINE_get_pkey_meth(ENGINE *e, int nid);
 OSSL_DEPRECATEDIN_3_0
 const EVP_PKEY_ASN1_METHOD *ENGINE_get_pkey_asn1_meth(ENGINE *e, int nid);
 OSSL_DEPRECATEDIN_3_0
 const EVP_PKEY_ASN1_METHOD *ENGINE_get_pkey_asn1_meth_str(ENGINE *e,
     const char *str,
     int len);
 OSSL_DEPRECATEDIN_3_0
 const EVP_PKEY_ASN1_METHOD *ENGINE_pkey_asn1_find_str(ENGINE **pe,
     const char *str, int len);
 OSSL_DEPRECATEDIN_3_0
 const ENGINE_CMD_DEFN *ENGINE_get_cmd_defns(const ENGINE *e);
 OSSL_DEPRECATEDIN_3_0 int ENGINE_get_flags(const ENGINE *e);
 #endif
 
 /*
  * 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 an 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.
  */
 #ifndef OPENSSL_NO_DEPRECATED_3_0
 OSSL_DEPRECATEDIN_3_0 int ENGINE_init(ENGINE *e);
 #endif
 /*
  * Free a functional reference to an engine type. This does not require a
  * corresponding call to ENGINE_free as it also releases a structural
  * reference.
  */
 #ifndef OPENSSL_NO_DEPRECATED_3_0
 OSSL_DEPRECATEDIN_3_0 int ENGINE_finish(ENGINE *e);
 #endif
 
 /*
  * 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.
  */
 #ifndef OPENSSL_NO_DEPRECATED_3_0
 OSSL_DEPRECATEDIN_3_0
 EVP_PKEY *ENGINE_load_private_key(ENGINE *e, const char *key_id,
     UI_METHOD *ui_method, void *callback_data);
 OSSL_DEPRECATEDIN_3_0
 EVP_PKEY *ENGINE_load_public_key(ENGINE *e, const char *key_id,
     UI_METHOD *ui_method, void *callback_data);
 OSSL_DEPRECATEDIN_3_0
 int ENGINE_load_ssl_client_cert(ENGINE *e, SSL *s, STACK_OF(X509_NAME) *ca_dn,
     X509 **pcert, EVP_PKEY **ppkey,
     STACK_OF(X509) **pother,
     UI_METHOD *ui_method, void *callback_data);
 #endif
 
 /*
  * 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.
  */
 #ifndef OPENSSL_NO_DEPRECATED_3_0
 OSSL_DEPRECATEDIN_3_0 ENGINE *ENGINE_get_default_RSA(void);
 #endif
 /* Same for the other "methods" */
 #ifndef OPENSSL_NO_DEPRECATED_3_0
 OSSL_DEPRECATEDIN_3_0 ENGINE *ENGINE_get_default_DSA(void);
 OSSL_DEPRECATEDIN_3_0 ENGINE *ENGINE_get_default_EC(void);
 OSSL_DEPRECATEDIN_3_0 ENGINE *ENGINE_get_default_DH(void);
 OSSL_DEPRECATEDIN_3_0 ENGINE *ENGINE_get_default_RAND(void);
 #endif
 /*
  * These functions can be used to get a functional reference to perform
  * ciphering or digesting corresponding to "nid".
  */
 #ifndef OPENSSL_NO_DEPRECATED_3_0
 OSSL_DEPRECATEDIN_3_0 ENGINE *ENGINE_get_cipher_engine(int nid);
 OSSL_DEPRECATEDIN_3_0 ENGINE *ENGINE_get_digest_engine(int nid);
 OSSL_DEPRECATEDIN_3_0 ENGINE *ENGINE_get_pkey_meth_engine(int nid);
 OSSL_DEPRECATEDIN_3_0 ENGINE *ENGINE_get_pkey_asn1_meth_engine(int nid);
 #endif
 
 /*
  * This sets a new default ENGINE structure for performing RSA operations. If
  * the result is non-zero (success) then the ENGINE structure will have had
  * its reference count up'd so the caller should still free their own
  * reference 'e'.
  */
 #ifndef OPENSSL_NO_DEPRECATED_3_0
 OSSL_DEPRECATEDIN_3_0 int ENGINE_set_default_RSA(ENGINE *e);
 OSSL_DEPRECATEDIN_3_0 int ENGINE_set_default_string(ENGINE *e,
     const char *def_list);
 #endif
 /* Same for the other "methods" */
 #ifndef OPENSSL_NO_DEPRECATED_3_0
 OSSL_DEPRECATEDIN_3_0 int ENGINE_set_default_DSA(ENGINE *e);
 OSSL_DEPRECATEDIN_3_0 int ENGINE_set_default_EC(ENGINE *e);
 OSSL_DEPRECATEDIN_3_0 int ENGINE_set_default_DH(ENGINE *e);
 OSSL_DEPRECATEDIN_3_0 int ENGINE_set_default_RAND(ENGINE *e);
 OSSL_DEPRECATEDIN_3_0 int ENGINE_set_default_ciphers(ENGINE *e);
 OSSL_DEPRECATEDIN_3_0 int ENGINE_set_default_digests(ENGINE *e);
 OSSL_DEPRECATEDIN_3_0 int ENGINE_set_default_pkey_meths(ENGINE *e);
 OSSL_DEPRECATEDIN_3_0 int ENGINE_set_default_pkey_asn1_meths(ENGINE *e);
 #endif
 
 /*
  * The combination "set" - the flags are bitwise "OR"d from the
  * ENGINE_METHOD_*** defines above. As with the "ENGINE_register_complete()"
  * function, this function can result in unnecessary static linkage. If your
  * application requires only specific functionality, consider using more
  * selective functions.
  */
 #ifndef OPENSSL_NO_DEPRECATED_3_0
 OSSL_DEPRECATEDIN_3_0 int ENGINE_set_default(ENGINE *e, unsigned int flags);
 OSSL_DEPRECATEDIN_3_0 void ENGINE_add_conf_module(void);
 #endif
 
 /* Deprecated functions ... */
 /* int ENGINE_clear_defaults(void); */
 
 /**************************/
 /* DYNAMIC ENGINE SUPPORT */
 /**************************/
 
 /* Binary/behaviour compatibility levels */
 #define OSSL_DYNAMIC_VERSION (unsigned long)0x00030000
 /*
  * Binary versions older than this are too old for us (whether we're a loader
  * or a loadee)
  */
 #define OSSL_DYNAMIC_OLDEST (unsigned long)0x00030000
 
 /*
  * When compiling an ENGINE entirely as an external shared library, loadable
  * by the "dynamic" ENGINE, these types are needed. The 'dynamic_fns'
  * structure type provides the calling application's (or library's) error
  * functionality and memory management function pointers to the loaded
  * library. These should be used/set in the loaded library code so that the
  * loading application's 'state' will be used/changed in all operations. The
  * 'static_state' pointer allows the loaded library to know if it shares the
  * same static data as the calling application (or library), and thus whether
  * these callbacks need to be set or not.
  */
 typedef void *(*dyn_MEM_malloc_fn)(size_t, const char *, int);
 typedef void *(*dyn_MEM_realloc_fn)(void *, size_t, const char *, int);
 typedef void (*dyn_MEM_free_fn)(void *, const char *, int);
 typedef struct st_dynamic_MEM_fns {
     dyn_MEM_malloc_fn malloc_fn;
     dyn_MEM_realloc_fn realloc_fn;
     dyn_MEM_free_fn free_fn;
 } dynamic_MEM_fns;
 /*
  * FIXME: Perhaps the memory and locking code (crypto.h) should declare and
  * use these types so we (and any other dependent code) can simplify a bit??
  */
 /* The top-level structure */
 typedef struct st_dynamic_fns {
     void *static_state;
     dynamic_MEM_fns mem_fns;
 } dynamic_fns;
 
 /*
  * The version checking function should be of this prototype. NB: The
  * ossl_version value passed in is the OSSL_DYNAMIC_VERSION of the loading
  * code. If this function returns zero, it indicates a (potential) version
  * incompatibility and the loaded library doesn't believe it can proceed.
  * Otherwise, the returned value is the (latest) version supported by the
  * loading library. The loader may still decide that the loaded code's
  * version is unsatisfactory and could veto the load. The function is
  * expected to be implemented with the symbol name "v_check", and a default
  * implementation can be fully instantiated with
  * IMPLEMENT_DYNAMIC_CHECK_FN().
  */
 typedef unsigned long (*dynamic_v_check_fn)(unsigned long ossl_version);
 #define IMPLEMENT_DYNAMIC_CHECK_FN()                       \
     OPENSSL_EXPORT unsigned long v_check(unsigned long v); \
     OPENSSL_EXPORT unsigned long v_check(unsigned long v)  \
     {                                                      \
         if (v >= OSSL_DYNAMIC_OLDEST)                      \
             return OSSL_DYNAMIC_VERSION;                   \
         return 0;                                          \
     }
 
 /*
  * This function is passed the ENGINE structure to initialise with its own
  * function and command settings. It should not adjust the structural or
  * functional reference counts. If this function returns zero, (a) the load
  * will be aborted, (b) the previous ENGINE state will be memcpy'd back onto
  * the structure, and (c) the shared library will be unloaded. So
  * implementations should do their own internal cleanup in failure
  * circumstances otherwise they could leak. The 'id' parameter, if non-NULL,
  * represents the ENGINE id that the loader is looking for. If this is NULL,
  * the shared library can choose to return failure or to initialise a
  * 'default' ENGINE. If non-NULL, the shared library must initialise only an
  * ENGINE matching the passed 'id'. The function is expected to be
  * implemented with the symbol name "bind_engine". A standard implementation
  * can be instantiated with IMPLEMENT_DYNAMIC_BIND_FN(fn) where the parameter
  * 'fn' is a callback function that populates the ENGINE structure and
  * returns an int value (zero for failure). 'fn' should have prototype;
  * [static] int fn(ENGINE *e, const char *id);
  */
 typedef int (*dynamic_bind_engine)(ENGINE *e, const char *id,
     const dynamic_fns *fns);
 #define IMPLEMENT_DYNAMIC_BIND_FN(fn)                                   \
     OPENSSL_EXPORT                                                      \
     int bind_engine(ENGINE *e, const char *id, const dynamic_fns *fns); \
     OPENSSL_EXPORT                                                      \
     int bind_engine(ENGINE *e, const char *id, const dynamic_fns *fns)  \
     {                                                                   \
         if (ENGINE_get_static_state() == fns->static_state)             \
             goto skip_cbs;                                              \
         CRYPTO_set_mem_functions(fns->mem_fns.malloc_fn,                \
             fns->mem_fns.realloc_fn,                                    \
             fns->mem_fns.free_fn);                                      \
         OPENSSL_init_crypto(OPENSSL_INIT_NO_ATEXIT, NULL);              \
     skip_cbs:                                                           \
         if (!fn(e, id))                                                 \
             return 0;                                                   \
         return 1;                                                       \
     }
 
 /*
  * If the loading application (or library) and the loaded ENGINE library
  * share the same static data (eg. they're both dynamically linked to the
  * same libcrypto.so) we need a way to avoid trying to set system callbacks -
  * this would fail, and for the same reason that it's unnecessary to try. If
  * the loaded ENGINE has (or gets from through the loader) its own copy of
  * the libcrypto static data, we will need to set the callbacks. The easiest
  * way to detect this is to have a function that returns a pointer to some
  * static data and let the loading application and loaded ENGINE compare
  * their respective values.
  */
 void *ENGINE_get_static_state(void);
 
 #if defined(__OpenBSD__) || defined(__FreeBSD__) || defined(__DragonFly__)
 #ifndef OPENSSL_NO_DEPRECATED_1_1_0
 OSSL_DEPRECATEDIN_1_1_0 void ENGINE_setup_bsd_cryptodev(void);
 #endif
 #endif
 
 #ifdef __cplusplus
 }
 #endif
 #endif /* OPENSSL_NO_ENGINE */
 #endif /* OPENSSL_ENGINE_H */

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