/*
 * Written by Geoff Thorpe (geoff@geoffthorpe.net) for the OpenSSL project
 * 2000.
 */
/* ====================================================================
 * Copyright (c) 1999-2001 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_INT_H
# define HEADER_ENGINE_INT_H

# include "internal/cryptlib.h"
# include "internal/threads.h"
# include <internal/engine.h>

#ifdef  __cplusplus
extern "C" {
#endif

extern CRYPTO_RWLOCK *global_engine_lock;

/*
 * If we compile with this symbol defined, then both reference counts in the
 * ENGINE structure will be monitored with a line of output on stderr for
 * each change. This prints the engine's pointer address (truncated to
 * unsigned int), "struct" or "funct" to indicate the reference type, the
 * before and after reference count, and the file:line-number pair. The
 * "engine_ref_debug" statements must come *after* the change.
 */
# ifdef ENGINE_REF_COUNT_DEBUG

#  define engine_ref_debug(e, isfunct, diff) \
        fprintf(stderr, "engine: %08x %s from %d to %d (%s:%d)\n", \
                (unsigned int)(e), (isfunct ? "funct" : "struct"), \
                ((isfunct) ? ((e)->funct_ref - (diff)) : ((e)->struct_ref - (diff))), \
                ((isfunct) ? (e)->funct_ref : (e)->struct_ref), \
                (OPENSSL_FILE), (OPENSSL_LINE))

# else

#  define engine_ref_debug(e, isfunct, diff)

# endif

/*
 * Any code that will need cleanup operations should use these functions to
 * register callbacks. ENGINE_cleanup() will call all registered callbacks in
 * order. NB: both the "add" functions assume the engine lock to already be
 * held (in "write" mode).
 */
typedef void (ENGINE_CLEANUP_CB) (void);
typedef struct st_engine_cleanup_item {
    ENGINE_CLEANUP_CB *cb;
} ENGINE_CLEANUP_ITEM;
DEFINE_STACK_OF(ENGINE_CLEANUP_ITEM)
void engine_cleanup_add_first(ENGINE_CLEANUP_CB *cb);
void engine_cleanup_add_last(ENGINE_CLEANUP_CB *cb);

/* We need stacks of ENGINEs for use in eng_table.c */
DEFINE_STACK_OF(ENGINE)

/*
 * If this symbol is defined then engine_table_select(), the function that is
 * used by RSA, DSA (etc) code to select registered ENGINEs, cache defaults
 * and functional references (etc), will display debugging summaries to
 * stderr.
 */
/* #define ENGINE_TABLE_DEBUG */

/*
 * This represents an implementation table. Dependent code should instantiate
 * it as a (ENGINE_TABLE *) pointer value set initially to NULL.
 */
typedef struct st_engine_table ENGINE_TABLE;
int engine_table_register(ENGINE_TABLE **table, ENGINE_CLEANUP_CB *cleanup,
                          ENGINE *e, const int *nids, int num_nids,
                          int setdefault);
void engine_table_unregister(ENGINE_TABLE **table, ENGINE *e);
void engine_table_cleanup(ENGINE_TABLE **table);
# ifndef ENGINE_TABLE_DEBUG
ENGINE *engine_table_select(ENGINE_TABLE **table, int nid);
# else
ENGINE *engine_table_select_tmp(ENGINE_TABLE **table, int nid, const char *f,
                                int l);
#  define engine_table_select(t,n) engine_table_select_tmp(t,n,OPENSSL_FILE,OPENSSL_LINE)
# endif
typedef void (engine_table_doall_cb) (int nid, STACK_OF(ENGINE) *sk,
                                      ENGINE *def, void *arg);
void engine_table_doall(ENGINE_TABLE *table, engine_table_doall_cb *cb,
                        void *arg);

/*
 * Internal versions of API functions that have control over locking. These
 * are used between C files when functionality needs to be shared but the
 * caller may already be controlling of the engine lock.
 */
int engine_unlocked_init(ENGINE *e);
int engine_unlocked_finish(ENGINE *e, int unlock_for_handlers);
int engine_free_util(ENGINE *e, int locked);

/*
 * This function will reset all "set"able values in an ENGINE to NULL. This
 * won't touch reference counts or ex_data, but is equivalent to calling all
 * the ENGINE_set_***() functions with a NULL value.
 */
void engine_set_all_null(ENGINE *e);

/*
 * NB: Bitwise OR-able values for the "flags" variable in ENGINE are now
 * exposed in engine.h.
 */

/* Free up dynamically allocated public key methods associated with ENGINE */

void engine_pkey_meths_free(ENGINE *e);
void engine_pkey_asn1_meths_free(ENGINE *e);

/* Once initialisation function */
extern CRYPTO_ONCE engine_lock_init;
void do_engine_lock_init(void);

/*
 * This is a structure for storing implementations of various crypto
 * algorithms and functions.
 */
struct engine_st {
    const char *id;
    const char *name;
    const RSA_METHOD *rsa_meth;
    const DSA_METHOD *dsa_meth;
    const DH_METHOD *dh_meth;
    const EC_KEY_METHOD *ec_meth;
    const RAND_METHOD *rand_meth;
    /* Cipher handling is via this callback */
    ENGINE_CIPHERS_PTR ciphers;
    /* Digest handling is via this callback */
    ENGINE_DIGESTS_PTR digests;
    /* Public key handling via this callback */
    ENGINE_PKEY_METHS_PTR pkey_meths;
    /* ASN1 public key handling via this callback */
    ENGINE_PKEY_ASN1_METHS_PTR pkey_asn1_meths;
    ENGINE_GEN_INT_FUNC_PTR destroy;
    ENGINE_GEN_INT_FUNC_PTR init;
    ENGINE_GEN_INT_FUNC_PTR finish;
    ENGINE_CTRL_FUNC_PTR ctrl;
    ENGINE_LOAD_KEY_PTR load_privkey;
    ENGINE_LOAD_KEY_PTR load_pubkey;
    ENGINE_SSL_CLIENT_CERT_PTR load_ssl_client_cert;
    const ENGINE_CMD_DEFN *cmd_defns;
    int flags;
    /* reference count on the structure itself */
    int struct_ref;
    /*
     * reference count on usability of the engine type. NB: This controls the
     * loading and initialisation of any functionality required by this
     * engine, whereas the previous count is simply to cope with
     * (de)allocation of this structure. Hence, running_ref <= struct_ref at
     * all times.
     */
    int funct_ref;
    /* A place to store per-ENGINE data */
    CRYPTO_EX_DATA ex_data;
    /* Used to maintain the linked-list of engines. */
    struct engine_st *prev;
    struct engine_st *next;
};

typedef struct st_engine_pile ENGINE_PILE;

DEFINE_LHASH_OF(ENGINE_PILE);

#ifdef  __cplusplus
}
#endif

#endif                          /* HEADER_ENGINE_INT_H */