make engine file names unique in 8.3

1 files changed, 864 insertions, 0 deletions

diff --git a/crypto/engine/eng_lib.c b/crypto/engine/eng_lib.c
new file mode 100644
index 0000000000..94ce057307
--- /dev/null
+++ b/crypto/engine/eng_lib.c
@@ -0,0 +1,864 @@
+/* crypto/engine/engine_lib.c */
+/* 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).
+ *
+ */
+
+#include <openssl/crypto.h>
+#include "cryptlib.h"
+#include "eng_int.h"
+#include <openssl/engine.h>
+
+/* These pointers each have their own "functional reference" when they
+ * are non-NULL. Similarly, when they are retrieved by a call to
+ * ENGINE_get_default_[RSA|DSA|...] the returned pointer is also a
+ * reference and the caller is responsible for freeing that when they
+ * are finished with it (with a call to ENGINE_finish() *NOT* just
+ * ENGINE_free()!!!!!!). */
+#ifndef OPENSSL_NO_RSA
+static ENGINE *engine_def_rsa = NULL;
+#endif
+#ifndef OPENSSL_NO_DSA
+static ENGINE *engine_def_dsa = NULL;
+#endif
+#ifndef OPENSSL_NO_DH
+static ENGINE *engine_def_dh = NULL;
+#endif
+static ENGINE *engine_def_rand = NULL;
+static ENGINE *engine_def_bn_mod_exp = NULL;
+static ENGINE *engine_def_bn_mod_exp_crt = NULL;
+/* A static "once-only" flag used to control if/when the above were
+ * initialised to suitable start-up defaults. */
+static int engine_def_flag = 0;
+
+/* When querying a ENGINE-specific control command's 'description', this string
+ * is used if the ENGINE_CMD_DEFN has cmd_desc set to NULL. */
+static const char *int_no_description = "";
+
+/* This is used in certain static utility functions to save code
+ * repetition for per-algorithm functions. */
+typedef enum {
+	ENGINE_TYPE_RSA,
+	ENGINE_TYPE_DSA,
+	ENGINE_TYPE_DH,
+	ENGINE_TYPE_RAND,
+	ENGINE_TYPE_BN_MOD_EXP,
+	ENGINE_TYPE_BN_MOD_EXP_CRT
+	} ENGINE_TYPE;
+
+static void engine_def_check_util(ENGINE **def, ENGINE *val)
+	{
+	*def = val;
+	val->struct_ref++;
+	val->funct_ref++;
+	engine_ref_debug(val, 0, 1)
+	engine_ref_debug(val, 1, 1)
+	}
+
+/* In a slight break with convention - this static function must be
+ * called *outside* any locking of CRYPTO_LOCK_ENGINE. */
+static void engine_def_check(void)
+	{
+	ENGINE *e;
+	if(engine_def_flag)
+		return;
+	e = ENGINE_get_first();
+	if(e == NULL)
+		/* The list is empty ... not much we can do! */
+		return;
+	/* We have a structural reference, see if getting a functional
+	 * reference is possible. This is done to cope with init errors
+	 * in the engine - the following locked code does a bunch of
+	 * manual "ENGINE_init"s which do *not* allow such an init
+	 * error so this is worth doing. */
+	if(ENGINE_init(e))
+		{
+		CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
+		/* Doing another check here prevents an obvious race
+		 * condition because the whole function itself cannot
+		 * be locked. */
+		if(engine_def_flag)
+			goto skip_set_defaults;
+		/* OK, we got a functional reference, so we get one each
+		 * for the defaults too. */
+#ifndef OPENSSL_NO_RSA
+		engine_def_check_util(&engine_def_rsa, e);
+#endif
+#ifndef OPENSSL_NO_DSA
+		engine_def_check_util(&engine_def_dsa, e);
+#endif
+#ifndef OPENSSL_NO_DH
+		engine_def_check_util(&engine_def_dh, e);
+#endif
+		engine_def_check_util(&engine_def_rand, e);
+		engine_def_check_util(&engine_def_bn_mod_exp, e);
+		engine_def_check_util(&engine_def_bn_mod_exp_crt, e);
+		engine_def_flag = 1;
+skip_set_defaults:
+		CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
+		/* The "if" needs to be balanced out. */
+		ENGINE_finish(e);
+		}
+	/* We need to balance out the fact we obtained a structural
+	 * reference to begin with from ENGINE_get_first(). */
+	ENGINE_free(e);
+	}
+
+/* Initialise a engine type for use (or up its functional reference count
+ * if it's already in use). */
+int ENGINE_init(ENGINE *e)
+	{
+	int to_return = 1;
+
+	if(e == NULL)
+		{
+		ENGINEerr(ENGINE_F_ENGINE_INIT,ERR_R_PASSED_NULL_PARAMETER);
+		return 0;
+		}
+	CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
+	if((e->funct_ref == 0) && e->init)
+		/* This is the first functional reference and the engine
+		 * requires initialisation so we do it now. */
+		to_return = e->init(e);
+	if(to_return)
+		{
+		/* OK, we return a functional reference which is also a
+		 * structural reference. */
+		e->struct_ref++;
+		e->funct_ref++;
+		engine_ref_debug(e, 0, 1)
+		engine_ref_debug(e, 1, 1)
+		}
+	CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
+	return to_return;
+	}
+
+/* Free a functional reference to a engine type */
+int ENGINE_finish(ENGINE *e)
+	{
+	int to_return = 1;
+
+	if(e == NULL)
+		{
+		ENGINEerr(ENGINE_F_ENGINE_FINISH,ERR_R_PASSED_NULL_PARAMETER);
+		return 0;
+		}
+	CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
+	/* Reduce the functional reference count here so if it's the terminating
+	 * case, we can release the lock safely and call the finish() handler
+	 * without risk of a race. We get a race if we leave the count until
+	 * after and something else is calling "finish" at the same time -
+	 * there's a chance that both threads will together take the count from
+	 * 2 to 0 without either calling finish(). */
+	e->funct_ref--;
+	engine_ref_debug(e, 1, -1)
+	if((e->funct_ref == 0) && e->finish)
+		{
+		CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
+		if(!(to_return = e->finish(e)))
+			{
+			ENGINEerr(ENGINE_F_ENGINE_FINISH,ENGINE_R_FINISH_FAILED);
+			return 0;
+			}
+		}
+	else
+		CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
+#ifdef REF_CHECK
+	if(e->funct_ref < 0)
+		{
+		fprintf(stderr,"ENGINE_finish, bad functional reference count\n");
+		abort();
+		}
+#endif
+	/* Release the structural reference too */
+	if(!ENGINE_free(e))
+		{
+		ENGINEerr(ENGINE_F_ENGINE_FINISH,ENGINE_R_FINISH_FAILED);
+		return 0;
+		}
+	return to_return;
+	}
+
+EVP_PKEY *ENGINE_load_private_key(ENGINE *e, const char *key_id,
+	UI_METHOD *ui_method, void *callback_data)
+	{
+	EVP_PKEY *pkey;
+
+	if(e == NULL)
+		{
+		ENGINEerr(ENGINE_F_ENGINE_LOAD_PRIVATE_KEY,
+			ERR_R_PASSED_NULL_PARAMETER);
+		return 0;
+		}
+	CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
+	if(e->funct_ref == 0)
+		{
+		CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
+		ENGINEerr(ENGINE_F_ENGINE_LOAD_PRIVATE_KEY,
+			ENGINE_R_NOT_INITIALISED);
+		return 0;
+		}
+	CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
+	if (!e->load_privkey)
+		{
+		ENGINEerr(ENGINE_F_ENGINE_LOAD_PRIVATE_KEY,
+			ENGINE_R_NO_LOAD_FUNCTION);
+		return 0;
+		}
+	pkey = e->load_privkey(e, key_id, ui_method, callback_data);
+	if (!pkey)
+		{
+		ENGINEerr(ENGINE_F_ENGINE_LOAD_PRIVATE_KEY,
+			ENGINE_R_FAILED_LOADING_PRIVATE_KEY);
+		return 0;
+		}
+	return pkey;
+	}
+
+EVP_PKEY *ENGINE_load_public_key(ENGINE *e, const char *key_id,
+	UI_METHOD *ui_method, void *callback_data)
+	{
+	EVP_PKEY *pkey;
+
+	if(e == NULL)
+		{
+		ENGINEerr(ENGINE_F_ENGINE_LOAD_PUBLIC_KEY,
+			ERR_R_PASSED_NULL_PARAMETER);
+		return 0;
+		}
+	CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
+	if(e->funct_ref == 0)
+		{
+		CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
+		ENGINEerr(ENGINE_F_ENGINE_LOAD_PUBLIC_KEY,
+			ENGINE_R_NOT_INITIALISED);
+		return 0;
+		}
+	CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
+	if (!e->load_pubkey)
+		{
+		ENGINEerr(ENGINE_F_ENGINE_LOAD_PUBLIC_KEY,
+			ENGINE_R_NO_LOAD_FUNCTION);
+		return 0;
+		}
+	pkey = e->load_pubkey(e, key_id, ui_method, callback_data);
+	if (!pkey)
+		{
+		ENGINEerr(ENGINE_F_ENGINE_LOAD_PUBLIC_KEY,
+			ENGINE_R_FAILED_LOADING_PUBLIC_KEY);
+		return 0;
+		}
+	return pkey;
+	}
+
+/* These internal functions handle 'CMD'-related control commands when the
+ * ENGINE in question has asked us to take care of it (ie. the ENGINE did not
+ * set the ENGINE_FLAGS_MANUAL_CMD_CTRL flag. */
+
+static int int_ctrl_cmd_is_null(const ENGINE_CMD_DEFN *defn)
+	{
+	if((defn->cmd_num == 0) || (defn->cmd_name == NULL))
+		return 1;
+	return 0;
+	}
+
+static int int_ctrl_cmd_by_name(const ENGINE_CMD_DEFN *defn, const char *s)
+	{
+	int idx = 0;
+	while(!int_ctrl_cmd_is_null(defn) && (strcmp(defn->cmd_name, s) != 0))
+		{
+		idx++;
+		defn++;
+		}
+	if(int_ctrl_cmd_is_null(defn))
+		/* The given name wasn't found */
+		return -1;
+	return idx;
+	}
+
+static int int_ctrl_cmd_by_num(const ENGINE_CMD_DEFN *defn, unsigned int num)
+	{
+	int idx = 0;
+	/* NB: It is stipulated that 'cmd_defn' lists are ordered by cmd_num. So
+	 * our searches don't need to take any longer than necessary. */
+	while(!int_ctrl_cmd_is_null(defn) && (defn->cmd_num < num))
+		{
+		idx++;
+		defn++;
+		}
+	if(defn->cmd_num == num)
+		return idx;
+	/* The given cmd_num wasn't found */
+	return -1;
+	}
+
+static int int_ctrl_helper(ENGINE *e, int cmd, long i, void *p, void (*f)())
+	{
+	int idx;
+	char *s = (char *)p;
+	/* Take care of the easy one first (eg. it requires no searches) */
+	if(cmd == ENGINE_CTRL_GET_FIRST_CMD_TYPE)
+		{
+		if((e->cmd_defns == NULL) || int_ctrl_cmd_is_null(e->cmd_defns))
+			return 0;
+		return e->cmd_defns->cmd_num;
+		}
+	/* One or two commands require that "p" be a valid string buffer */
+	if((cmd == ENGINE_CTRL_GET_CMD_FROM_NAME) ||
+			(cmd == ENGINE_CTRL_GET_NAME_FROM_CMD) ||
+			(cmd == ENGINE_CTRL_GET_DESC_FROM_CMD))
+		{
+		if(s == NULL)
+			{
+			ENGINEerr(ENGINE_F_INT_CTRL_HELPER,
+				ERR_R_PASSED_NULL_PARAMETER);
+			return -1;
+			}
+		}
+	/* Now handle cmd_name -> cmd_num conversion */
+	if(cmd == ENGINE_CTRL_GET_CMD_FROM_NAME)
+		{
+		if((e->cmd_defns == NULL) || ((idx = int_ctrl_cmd_by_name(
+						e->cmd_defns, s)) < 0))
+			{
+			ENGINEerr(ENGINE_F_INT_CTRL_HELPER,
+				ENGINE_R_INVALID_CMD_NAME);
+			return -1;
+			}
+		return e->cmd_defns[idx].cmd_num;
+		}
+	/* For the rest of the commands, the 'long' argument must specify a
+	 * valie command number - so we need to conduct a search. */
+	if((e->cmd_defns == NULL) || ((idx = int_ctrl_cmd_by_num(e->cmd_defns,
+					(unsigned int)i)) < 0))
+		{
+		ENGINEerr(ENGINE_F_INT_CTRL_HELPER,
+			ENGINE_R_INVALID_CMD_NUMBER);
+		return -1;
+		}
+	/* Now the logic splits depending on command type */
+	switch(cmd)
+		{
+	case ENGINE_CTRL_GET_NEXT_CMD_TYPE:
+		idx++;
+		if(int_ctrl_cmd_is_null(e->cmd_defns + idx))
+			/* end-of-list */
+			return 0;
+		else
+			return e->cmd_defns[idx].cmd_num;
+	case ENGINE_CTRL_GET_NAME_LEN_FROM_CMD:
+		return strlen(e->cmd_defns[idx].cmd_name);
+	case ENGINE_CTRL_GET_NAME_FROM_CMD:
+		return sprintf(s, "%s", e->cmd_defns[idx].cmd_name);
+	case ENGINE_CTRL_GET_DESC_LEN_FROM_CMD:
+		if(e->cmd_defns[idx].cmd_desc)
+			return strlen(e->cmd_defns[idx].cmd_desc);
+		return strlen(int_no_description);
+	case ENGINE_CTRL_GET_DESC_FROM_CMD:
+		if(e->cmd_defns[idx].cmd_desc)
+			return sprintf(s, "%s", e->cmd_defns[idx].cmd_desc);
+		return sprintf(s, "%s", int_no_description);
+	case ENGINE_CTRL_GET_CMD_FLAGS:
+		return e->cmd_defns[idx].cmd_flags;
+		}
+	/* Shouldn't really be here ... */
+	ENGINEerr(ENGINE_F_INT_CTRL_HELPER,ENGINE_R_INTERNAL_LIST_ERROR);
+	return -1;
+	}
+
+int ENGINE_ctrl(ENGINE *e, int cmd, long i, void *p, void (*f)())
+	{
+	int ctrl_exists, ref_exists;
+	if(e == NULL)
+		{
+		ENGINEerr(ENGINE_F_ENGINE_CTRL,ERR_R_PASSED_NULL_PARAMETER);
+		return 0;
+		}
+	CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
+	ref_exists = ((e->struct_ref > 0) ? 1 : 0);
+	CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
+	ctrl_exists = ((e->ctrl == NULL) ? 0 : 1);
+	if(!ref_exists)
+		{
+		ENGINEerr(ENGINE_F_ENGINE_CTRL,ENGINE_R_NO_REFERENCE);
+		return 0;
+		}
+	/* Intercept any "root-level" commands before trying to hand them on to
+	 * ctrl() handlers. */
+	switch(cmd)
+		{
+	case ENGINE_CTRL_HAS_CTRL_FUNCTION:
+		return ctrl_exists;
+	case ENGINE_CTRL_GET_FIRST_CMD_TYPE:
+	case ENGINE_CTRL_GET_NEXT_CMD_TYPE:
+	case ENGINE_CTRL_GET_CMD_FROM_NAME:
+	case ENGINE_CTRL_GET_NAME_LEN_FROM_CMD:
+	case ENGINE_CTRL_GET_NAME_FROM_CMD:
+	case ENGINE_CTRL_GET_DESC_LEN_FROM_CMD:
+	case ENGINE_CTRL_GET_DESC_FROM_CMD:
+	case ENGINE_CTRL_GET_CMD_FLAGS:
+		if(ctrl_exists && !(e->flags & ENGINE_FLAGS_MANUAL_CMD_CTRL))
+			return int_ctrl_helper(e,cmd,i,p,f);
+		if(!ctrl_exists)
+			{
+			ENGINEerr(ENGINE_F_ENGINE_CTRL,ENGINE_R_NO_CONTROL_FUNCTION);
+			/* For these cmd-related functions, failure is indicated
+			 * by a -1 return value (because 0 is used as a valid
+			 * return in some places). */
+			return -1;
+			}
+	default:
+		break;
+		}
+	/* Anything else requires a ctrl() handler to exist. */
+	if(!ctrl_exists)
+		{
+		ENGINEerr(ENGINE_F_ENGINE_CTRL,ENGINE_R_NO_CONTROL_FUNCTION);
+		return 0;
+		}
+	return e->ctrl(e, cmd, i, p, f);
+	}
+
+int ENGINE_cmd_is_executable(ENGINE *e, int cmd)
+	{
+	int flags;
+	if((flags = ENGINE_ctrl(e, ENGINE_CTRL_GET_CMD_FLAGS, cmd, NULL, NULL)) < 0)
+		{
+		ENGINEerr(ENGINE_F_ENGINE_CMD_IS_EXECUTABLE,
+			ENGINE_R_INVALID_CMD_NUMBER);
+		return 0;
+		}
+	if(!(flags & ENGINE_CMD_FLAG_NO_INPUT) &&
+			!(flags & ENGINE_CMD_FLAG_NUMERIC) &&
+			!(flags & ENGINE_CMD_FLAG_STRING))
+		return 0;
+	return 1;
+	}
+
+int ENGINE_ctrl_cmd(ENGINE *e, const char *cmd_name,
+        long i, void *p, void (*f)(), int cmd_optional)
+        {
+	int num;
+
+	if((e == NULL) || (cmd_name == NULL))
+		{
+		ENGINEerr(ENGINE_F_ENGINE_CTRL_CMD_STRING,
+			ERR_R_PASSED_NULL_PARAMETER);
+		return 0;
+		}
+	if((e->ctrl == NULL) || ((num = ENGINE_ctrl(e,
+					ENGINE_CTRL_GET_CMD_FROM_NAME,
+					0, (void *)cmd_name, NULL)) <= 0))
+		{
+		/* If the command didn't *have* to be supported, we fake
+		 * success. This allows certain settings to be specified for
+		 * multiple ENGINEs and only require a change of ENGINE id
+		 * (without having to selectively apply settings). Eg. changing
+		 * from a hardware device back to the regular software ENGINE
+		 * without editing the config file, etc. */
+		if(cmd_optional)
+			{
+			ERR_clear_error();
+			return 1;
+			}
+		ENGINEerr(ENGINE_F_ENGINE_CTRL_CMD,
+			ENGINE_R_INVALID_CMD_NAME);
+		return 0;
+		}
+	/* Force the result of the control command to 0 or 1, for the reasons
+	 * mentioned before. */
+        if (ENGINE_ctrl(e, num, i, p, f))
+                return 1;
+        return 0;
+        }
+
+int ENGINE_ctrl_cmd_string(ENGINE *e, const char *cmd_name, const char *arg,
+				int cmd_optional)
+	{
+	int num, flags;
+	long l;
+	char *ptr;
+	if((e == NULL) || (cmd_name == NULL))
+		{
+		ENGINEerr(ENGINE_F_ENGINE_CTRL_CMD_STRING,
+			ERR_R_PASSED_NULL_PARAMETER);
+		return 0;
+		}
+	if((e->ctrl == NULL) || ((num = ENGINE_ctrl(e,
+					ENGINE_CTRL_GET_CMD_FROM_NAME,
+					0, (void *)cmd_name, NULL)) <= 0))
+		{
+		/* If the command didn't *have* to be supported, we fake
+		 * success. This allows certain settings to be specified for
+		 * multiple ENGINEs and only require a change of ENGINE id
+		 * (without having to selectively apply settings). Eg. changing
+		 * from a hardware device back to the regular software ENGINE
+		 * without editing the config file, etc. */
+		if(cmd_optional)
+			{
+			ERR_clear_error();
+			return 1;
+			}
+		ENGINEerr(ENGINE_F_ENGINE_CTRL_CMD_STRING,
+			ENGINE_R_INVALID_CMD_NAME);
+		return 0;
+		}
+	if(!ENGINE_cmd_is_executable(e, num))
+		{
+		ENGINEerr(ENGINE_F_ENGINE_CTRL_CMD_STRING,
+			ENGINE_R_CMD_NOT_EXECUTABLE);
+		return 0;
+		}
+	if((flags = ENGINE_ctrl(e, ENGINE_CTRL_GET_CMD_FLAGS, num, NULL, NULL)) < 0)
+		{
+		/* Shouldn't happen, given that ENGINE_cmd_is_executable()
+		 * returned success. */
+		ENGINEerr(ENGINE_F_ENGINE_CTRL_CMD_STRING,
+			ENGINE_R_INTERNAL_LIST_ERROR);
+		return 0;
+		}
+	/* If the command takes no input, there must be no input. And vice
+	 * versa. */
+	if(flags & ENGINE_CMD_FLAG_NO_INPUT)
+		{
+		if(arg != NULL)
+			{
+			ENGINEerr(ENGINE_F_ENGINE_CTRL_CMD_STRING,
+				ENGINE_R_COMMAND_TAKES_NO_INPUT);
+			return 0;
+			}
+		/* We deliberately force the result of ENGINE_ctrl() to 0 or 1
+		 * rather than returning it as "return data". This is to ensure
+		 * usage of these commands is consistent across applications and
+		 * that certain applications don't understand it one way, and
+		 * others another. */
+		if(ENGINE_ctrl(e, num, 0, (void *)arg, NULL))
+			return 1;
+		return 0;
+		}
+	/* So, we require input */
+	if(arg == NULL)
+		{
+		ENGINEerr(ENGINE_F_ENGINE_CTRL_CMD_STRING,
+			ENGINE_R_COMMAND_TAKES_INPUT);
+		return 0;
+		}
+	/* If it takes string input, that's easy */
+	if(flags & ENGINE_CMD_FLAG_STRING)
+		{
+		/* Same explanation as above */
+		if(ENGINE_ctrl(e, num, 0, (void *)arg, NULL))
+			return 1;
+		return 0;
+		}
+	/* If it doesn't take numeric either, then it is unsupported for use in
+	 * a config-setting situation, which is what this function is for. This
+	 * should never happen though, because ENGINE_cmd_is_executable() was
+	 * used. */
+	if(!(flags & ENGINE_CMD_FLAG_NUMERIC))
+		{
+		ENGINEerr(ENGINE_F_ENGINE_CTRL_CMD_STRING,
+			ENGINE_R_INTERNAL_LIST_ERROR);
+		return 0;
+		}
+	l = strtol(arg, &ptr, 10);
+	if((arg == ptr) || (*ptr != '\0'))
+		{
+		ENGINEerr(ENGINE_F_ENGINE_CTRL_CMD_STRING,
+			ENGINE_R_ARGUMENT_IS_NOT_A_NUMBER);
+		return 0;
+		}
+	/* Force the result of the control command to 0 or 1, for the reasons
+	 * mentioned before. */
+	if(ENGINE_ctrl(e, num, l, NULL, NULL))
+		return 1;
+	return 0;
+	}
+
+static ENGINE *engine_get_default_type(ENGINE_TYPE t)
+	{
+	ENGINE *ret = NULL;
+
+	/* engine_def_check is lean and mean and won't replace any
+	 * prior default engines ... so we must ensure that it is always
+	 * the first function to get to touch the default values. */
+	engine_def_check();
+	CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
+	switch(t)
+		{
+#ifndef OPENSSL_NO_RSA
+	case ENGINE_TYPE_RSA:
+		ret = engine_def_rsa; break;
+#endif
+#ifndef OPENSSL_NO_DSA
+	case ENGINE_TYPE_DSA:
+		ret = engine_def_dsa; break;
+#endif
+#ifndef OPENSSL_NO_DH
+	case ENGINE_TYPE_DH:
+		ret = engine_def_dh; break;
+#endif
+	case ENGINE_TYPE_RAND:
+		ret = engine_def_rand; break;
+	case ENGINE_TYPE_BN_MOD_EXP:
+		ret = engine_def_bn_mod_exp; break;
+	case ENGINE_TYPE_BN_MOD_EXP_CRT:
+		ret = engine_def_bn_mod_exp_crt; break;
+	default:
+		break;
+		}
+	/* Unforunately we can't do this work outside the lock with a
+	 * call to ENGINE_init() because that would leave a race
+	 * condition open. */
+	if(ret)
+		{
+		ret->struct_ref++;
+		ret->funct_ref++;
+		engine_ref_debug(ret, 0, 1)
+		engine_ref_debug(ret, 1, 1)
+		}
+	CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
+	return ret;
+	}
+
+#ifndef OPENSSL_NO_RSA
+ENGINE *ENGINE_get_default_RSA(void)
+	{
+	return engine_get_default_type(ENGINE_TYPE_RSA);
+	}
+#endif
+
+#ifndef OPENSSL_NO_DSA
+ENGINE *ENGINE_get_default_DSA(void)
+	{
+	return engine_get_default_type(ENGINE_TYPE_DSA);
+	}
+#endif
+
+#ifndef OPENSSL_NO_DH
+ENGINE *ENGINE_get_default_DH(void)
+	{
+	return engine_get_default_type(ENGINE_TYPE_DH);
+	}
+#endif
+
+ENGINE *ENGINE_get_default_RAND(void)
+	{
+	return engine_get_default_type(ENGINE_TYPE_RAND);
+	}
+
+ENGINE *ENGINE_get_default_BN_mod_exp(void)
+	{
+	return engine_get_default_type(ENGINE_TYPE_BN_MOD_EXP);
+	}
+
+ENGINE *ENGINE_get_default_BN_mod_exp_crt(void)
+	{
+	return engine_get_default_type(ENGINE_TYPE_BN_MOD_EXP_CRT);
+	}
+
+static int engine_set_default_type(ENGINE_TYPE t, ENGINE *e)
+	{
+	ENGINE *old = NULL;
+
+	/* engine_def_check is lean and mean and won't replace any
+	 * prior default engines ... so we must ensure that it is always
+	 * the first function to get to touch the default values. */
+	engine_def_check();
+	/* Attempt to get a functional reference (we need one anyway, but
+	 * also, 'e' may be just a structural reference being passed in so
+	 * this call may actually be the first). */
+	if(e && !ENGINE_init(e))
+		{
+		ENGINEerr(ENGINE_F_ENGINE_SET_DEFAULT_TYPE,
+			ENGINE_R_INIT_FAILED);
+		return 0;
+		}
+	CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
+	switch(t)
+		{
+#ifndef OPENSSL_NO_RSA
+	case ENGINE_TYPE_RSA:
+		old = engine_def_rsa;
+		engine_def_rsa = e; break;
+#endif
+#ifndef OPENSSL_NO_DSA
+	case ENGINE_TYPE_DSA:
+		old = engine_def_dsa;
+		engine_def_dsa = e; break;
+#endif
+#ifndef OPENSSL_NO_DH
+	case ENGINE_TYPE_DH:
+		old = engine_def_dh;
+		engine_def_dh = e; break;
+#endif
+	case ENGINE_TYPE_RAND:
+		old = engine_def_rand;
+		engine_def_rand = e; break;
+	case ENGINE_TYPE_BN_MOD_EXP:
+		old = engine_def_bn_mod_exp;
+		engine_def_bn_mod_exp = e; break;
+	case ENGINE_TYPE_BN_MOD_EXP_CRT:
+		old = engine_def_bn_mod_exp_crt;
+		engine_def_bn_mod_exp_crt = e; break;
+	default:
+		break;
+		}
+	CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
+	/* If we've replaced a previous value, then we need to remove the
+	 * functional reference we had. */
+	if(old && !ENGINE_finish(old))
+		{
+		ENGINEerr(ENGINE_F_ENGINE_SET_DEFAULT_TYPE,
+			ENGINE_R_FINISH_FAILED);
+		return 0;
+		}
+	return 1;
+	}
+
+#ifndef OPENSSL_NO_RSA
+int ENGINE_set_default_RSA(ENGINE *e)
+	{
+	return engine_set_default_type(ENGINE_TYPE_RSA, e);
+	}
+#endif
+
+#ifndef OPENSSL_NO_DSA
+int ENGINE_set_default_DSA(ENGINE *e)
+	{
+	return engine_set_default_type(ENGINE_TYPE_DSA, e);
+	}
+#endif
+
+#ifndef OPENSSL_NO_DH
+int ENGINE_set_default_DH(ENGINE *e)
+	{
+	return engine_set_default_type(ENGINE_TYPE_DH, e);
+	}
+#endif
+
+int ENGINE_set_default_RAND(ENGINE *e)
+	{
+	return engine_set_default_type(ENGINE_TYPE_RAND, e);
+	}
+
+int ENGINE_set_default_BN_mod_exp(ENGINE *e)
+	{
+	return engine_set_default_type(ENGINE_TYPE_BN_MOD_EXP, e);
+	}
+
+int ENGINE_set_default_BN_mod_exp_crt(ENGINE *e)
+	{
+	return engine_set_default_type(ENGINE_TYPE_BN_MOD_EXP_CRT, e);
+	}
+
+int ENGINE_set_default(ENGINE *e, unsigned int flags)
+	{
+#ifndef OPENSSL_NO_RSA
+	if((flags & ENGINE_METHOD_RSA) && e->rsa_meth &&
+			!ENGINE_set_default_RSA(e))
+		return 0;
+#endif
+#ifndef OPENSSL_NO_DSA
+	if((flags & ENGINE_METHOD_DSA) && e->dsa_meth &&
+			!ENGINE_set_default_DSA(e))
+		return 0;
+#endif
+#ifndef OPENSSL_NO_DH
+	if((flags & ENGINE_METHOD_DH) && e->dh_meth &&
+			!ENGINE_set_default_DH(e))
+		return 0;
+#endif
+	if((flags & ENGINE_METHOD_RAND) && e->rand_meth &&
+			!ENGINE_set_default_RAND(e))
+		return 0;
+	if((flags & ENGINE_METHOD_BN_MOD_EXP) && e->bn_mod_exp &&
+			!ENGINE_set_default_BN_mod_exp(e))
+		return 0;
+	if((flags & ENGINE_METHOD_BN_MOD_EXP_CRT) && e->bn_mod_exp_crt &&
+			!ENGINE_set_default_BN_mod_exp_crt(e))
+		return 0;
+	return 1;
+	}
+
+int ENGINE_clear_defaults(void)
+	{
+	/* If the defaults haven't even been set yet, don't bother. Any kind of
+	 * "cleanup" has a kind of implicit race-condition if another thread is
+	 * trying to keep going, so we don't address that with locking. The
+	 * first ENGINE_set_default_*** call will actually *create* a standard
+	 * set of default ENGINEs (including init() and functional reference
+	 * counts aplenty) before the rest of this function undoes them all. So
+	 * save some hassle ... */
+	if(!engine_def_flag)
+		return 1;
+	if((0 == 1) ||
+#ifndef OPENSSL_NO_RSA
+			!ENGINE_set_default_RSA(NULL) ||
+#endif
+#ifndef OPENSSL_NO_DSA
+			!ENGINE_set_default_DSA(NULL) ||
+#endif
+#ifndef OPENSSL_NO_DH
+			!ENGINE_set_default_DH(NULL) ||
+#endif
+			!ENGINE_set_default_RAND(NULL) ||
+			!ENGINE_set_default_BN_mod_exp(NULL) ||
+			!ENGINE_set_default_BN_mod_exp_crt(NULL) ||
+			!RAND_set_rand_method(NULL))
+		return 0;
+	return 1;
+	}
+