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1/* crypto/engine/eng_int.h */
2/* Written by Geoff Thorpe (geoff@geoffthorpe.net) for the OpenSSL
3 * project 2000.
4 */
5/* ====================================================================
6 * Copyright (c) 1999-2001 The OpenSSL Project. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 *
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in
17 * the documentation and/or other materials provided with the
18 * distribution.
19 *
20 * 3. All advertising materials mentioning features or use of this
21 * software must display the following acknowledgment:
22 * "This product includes software developed by the OpenSSL Project
23 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
24 *
25 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
26 * endorse or promote products derived from this software without
27 * prior written permission. For written permission, please contact
28 * licensing@OpenSSL.org.
29 *
30 * 5. Products derived from this software may not be called "OpenSSL"
31 * nor may "OpenSSL" appear in their names without prior written
32 * permission of the OpenSSL Project.
33 *
34 * 6. Redistributions of any form whatsoever must retain the following
35 * acknowledgment:
36 * "This product includes software developed by the OpenSSL Project
37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
38 *
39 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
40 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
42 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
50 * OF THE POSSIBILITY OF SUCH DAMAGE.
51 * ====================================================================
52 *
53 * This product includes cryptographic software written by Eric Young
54 * (eay@cryptsoft.com). This product includes software written by Tim
55 * Hudson (tjh@cryptsoft.com).
56 *
57 */
58
59#ifndef HEADER_ENGINE_INT_H
60#define HEADER_ENGINE_INT_H
61
62/* Take public definitions from engine.h */
63#include <openssl/engine.h>
64
65#ifdef __cplusplus
66extern "C" {
67#endif
68
69/* If we compile with this symbol defined, then both reference counts in the
70 * ENGINE structure will be monitored with a line of output on stderr for each
71 * change. This prints the engine's pointer address (truncated to unsigned int),
72 * "struct" or "funct" to indicate the reference type, the before and after
73 * reference count, and the file:line-number pair. The "engine_ref_debug"
74 * statements must come *after* the change. */
75#ifdef ENGINE_REF_COUNT_DEBUG
76
77#define engine_ref_debug(e, isfunct, diff) \
78 fprintf(stderr, "engine: %08x %s from %d to %d (%s:%d)\n", \
79 (unsigned int)(e), (isfunct ? "funct" : "struct"), \
80 ((isfunct) ? ((e)->funct_ref - (diff)) : ((e)->struct_ref - (diff))), \
81 ((isfunct) ? (e)->funct_ref : (e)->struct_ref), \
82 (__FILE__), (__LINE__));
83
84#else
85
86#define engine_ref_debug(e, isfunct, diff)
87
88#endif
89
90/* Any code that will need cleanup operations should use these functions to
91 * register callbacks. ENGINE_cleanup() will call all registered callbacks in
92 * order. NB: both the "add" functions assume CRYPTO_LOCK_ENGINE to already be
93 * held (in "write" mode). */
94typedef void (ENGINE_CLEANUP_CB)(void);
95typedef struct st_engine_cleanup_item
96 {
97 ENGINE_CLEANUP_CB *cb;
98 } ENGINE_CLEANUP_ITEM;
99DECLARE_STACK_OF(ENGINE_CLEANUP_ITEM)
100void engine_cleanup_add_first(ENGINE_CLEANUP_CB *cb);
101void engine_cleanup_add_last(ENGINE_CLEANUP_CB *cb);
102
103/* We need stacks of ENGINEs for use in eng_table.c */
104DECLARE_STACK_OF(ENGINE)
105
106/* If this symbol is defined then engine_table_select(), the function that is
107 * used by RSA, DSA (etc) code to select registered ENGINEs, cache defaults and
108 * functional references (etc), will display debugging summaries to stderr. */
109/* #define ENGINE_TABLE_DEBUG */
110
111/* This represents an implementation table. Dependent code should instantiate it
112 * as a (ENGINE_TABLE *) pointer value set initially to NULL. */
113typedef struct st_engine_table ENGINE_TABLE;
114int engine_table_register(ENGINE_TABLE **table, ENGINE_CLEANUP_CB *cleanup,
115 ENGINE *e, const int *nids, int num_nids, int setdefault);
116void engine_table_unregister(ENGINE_TABLE **table, ENGINE *e);
117void engine_table_cleanup(ENGINE_TABLE **table);
118#ifndef ENGINE_TABLE_DEBUG
119ENGINE *engine_table_select(ENGINE_TABLE **table, int nid);
120#else
121ENGINE *engine_table_select_tmp(ENGINE_TABLE **table, int nid, const char *f, int l);
122#define engine_table_select(t,n) engine_table_select_tmp(t,n,__FILE__,__LINE__)
123#endif
124
125/* Internal versions of API functions that have control over locking. These are
126 * used between C files when functionality needs to be shared but the caller may
127 * already be controlling of the CRYPTO_LOCK_ENGINE lock. */
128int engine_unlocked_init(ENGINE *e);
129int engine_unlocked_finish(ENGINE *e, int unlock_for_handlers);
130int engine_free_util(ENGINE *e, int locked);
131
132/* This function will reset all "set"able values in an ENGINE to NULL. This
133 * won't touch reference counts or ex_data, but is equivalent to calling all the
134 * ENGINE_set_***() functions with a NULL value. */
135void engine_set_all_null(ENGINE *e);
136
137/* NB: Bitwise OR-able values for the "flags" variable in ENGINE are now exposed
138 * in engine.h. */
139
140/* This is a structure for storing implementations of various crypto
141 * algorithms and functions. */
142struct engine_st
143 {
144 const char *id;
145 const char *name;
146 const RSA_METHOD *rsa_meth;
147 const DSA_METHOD *dsa_meth;
148 const DH_METHOD *dh_meth;
149 const RAND_METHOD *rand_meth;
150 /* Cipher handling is via this callback */
151 ENGINE_CIPHERS_PTR ciphers;
152 /* Digest handling is via this callback */
153 ENGINE_DIGESTS_PTR digests;
154
155
156 ENGINE_GEN_INT_FUNC_PTR destroy;
157
158 ENGINE_GEN_INT_FUNC_PTR init;
159 ENGINE_GEN_INT_FUNC_PTR finish;
160 ENGINE_CTRL_FUNC_PTR ctrl;
161 ENGINE_LOAD_KEY_PTR load_privkey;
162 ENGINE_LOAD_KEY_PTR load_pubkey;
163
164 const ENGINE_CMD_DEFN *cmd_defns;
165 int flags;
166 /* reference count on the structure itself */
167 int struct_ref;
168 /* reference count on usability of the engine type. NB: This
169 * controls the loading and initialisation of any functionlity
170 * required by this engine, whereas the previous count is
171 * simply to cope with (de)allocation of this structure. Hence,
172 * running_ref <= struct_ref at all times. */
173 int funct_ref;
174 /* A place to store per-ENGINE data */
175 CRYPTO_EX_DATA ex_data;
176 /* Used to maintain the linked-list of engines. */
177 struct engine_st *prev;
178 struct engine_st *next;
179 };
180
181#ifdef __cplusplus
182}
183#endif
184
185#endif /* HEADER_ENGINE_INT_H */
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