crypto/evp/evp_fetch.c - third_party/openssl - Git at Google

 /*
  * Copyright 2019-2020 The OpenSSL Project Authors. 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
  */

 #include <stddef.h>
 #include <openssl/types.h>
 #include <openssl/evp.h>
 #include <openssl/core.h>
 #include "internal/cryptlib.h"
 #include "internal/thread_once.h"
 #include "internal/property.h"
 #include "internal/core.h"
 #include "internal/provider.h"
 #include "internal/namemap.h"
 #include "crypto/evp.h"    /* evp_local.h needs it */
 #include "evp_local.h"

 #define NAME_SEPARATOR ':'

 static void evp_method_store_free(void *vstore)
 {
     ossl_method_store_free(vstore);
 }

 static void *evp_method_store_new(OPENSSL_CTX *ctx)
 {
     return ossl_method_store_new(ctx);
 }


 static const OPENSSL_CTX_METHOD evp_method_store_method = {
     evp_method_store_new,
     evp_method_store_free,
 };

 /* Data to be passed through ossl_method_construct() */
 struct evp_method_data_st {
     OPENSSL_CTX *libctx;
     OSSL_METHOD_CONSTRUCT_METHOD *mcm;
     int operation_id;            /* For get_evp_method_from_store() */
     int name_id;                 /* For get_evp_method_from_store() */
     const char *names;           /* For get_evp_method_from_store() */
     const char *propquery;       /* For get_evp_method_from_store() */
     void *(*method_from_dispatch)(int name_id, const OSSL_DISPATCH *,
                                   OSSL_PROVIDER *);
     int (*refcnt_up_method)(void *method);
     void (*destruct_method)(void *method);
 };

 /*
  * Generic routines to fetch / create EVP methods with ossl_method_construct()
  */
 static void *alloc_tmp_evp_method_store(OPENSSL_CTX *ctx)
 {
     return ossl_method_store_new(ctx);
 }

  static void dealloc_tmp_evp_method_store(void *store)
 {
     if (store != NULL)
         ossl_method_store_free(store);
 }

 static OSSL_METHOD_STORE *get_evp_method_store(OPENSSL_CTX *libctx)
 {
     return openssl_ctx_get_data(libctx, OPENSSL_CTX_EVP_METHOD_STORE_INDEX,
                                 &evp_method_store_method);
 }

 /*
  * To identify the method in the EVP method store, we mix the name identity
  * with the operation identity, under the assumption that we don't have more
  * than 2^24 names or more than 2^8 operation types.
  *
  * The resulting identity is a 32-bit integer, composed like this:
  *
  * +---------24 bits--------+-8 bits-+
  * |      name identity     | op id  |
  * +------------------------+--------+
  */
 static uint32_t evp_method_id(int name_id, unsigned int operation_id)
 {
     if (!ossl_assert(name_id > 0 && name_id < (1 << 24))
         || !ossl_assert(operation_id > 0 && operation_id < (1 << 8)))
         return 0;
     return ((name_id << 8) & 0xFFFFFF00) | (operation_id & 0x000000FF);
 }

 static void *get_evp_method_from_store(OPENSSL_CTX *libctx, void *store,
                                        void *data)
 {
     struct evp_method_data_st *methdata = data;
     void *method = NULL;
     int name_id;
     uint32_t meth_id;

     /*
      * get_evp_method_from_store() is only called to try and get the method
      * that evp_generic_fetch() is asking for, and the operation id as well
      * as the name or name id are passed via methdata.
      */
     if ((name_id = methdata->name_id) == 0) {
         OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx);
         const char *names = methdata->names;
         const char *q = strchr(names, NAME_SEPARATOR);
         size_t l = (q == NULL ? strlen(names) : (size_t)(q - names));

         if (namemap == 0)
             return NULL;
         name_id = ossl_namemap_name2num_n(namemap, names, l);
     }

     if (name_id == 0
         || (meth_id = evp_method_id(name_id, methdata->operation_id)) == 0)
         return NULL;

     if (store == NULL
         && (store = get_evp_method_store(libctx)) == NULL)
         return NULL;

     if (!ossl_method_store_fetch(store, meth_id, methdata->propquery,
                                  &method))
         return NULL;
     return method;
 }

 static int put_evp_method_in_store(OPENSSL_CTX *libctx, void *store,
                                    void *method, const OSSL_PROVIDER *prov,
                                    int operation_id, const char *names,
                                    const char *propdef, void *data)
 {
     struct evp_method_data_st *methdata = data;
     OSSL_NAMEMAP *namemap;
     int name_id;
     uint32_t meth_id;
     size_t l = 0;

     /*
      * put_evp_method_in_store() is only called with an EVP method that was
      * successfully created by construct_method() below, which means that
      * all the names should already be stored in the namemap with the same
      * numeric identity, so just use the first to get that identity.
      */
     if (names != NULL) {
         const char *q = strchr(names, NAME_SEPARATOR);

         l = (q == NULL ? strlen(names) : (size_t)(q - names));
     }

     if ((namemap = ossl_namemap_stored(libctx)) == NULL
         || (name_id = ossl_namemap_name2num_n(namemap, names, l)) == 0
         || (meth_id = evp_method_id(name_id, operation_id)) == 0)
         return 0;

     if (store == NULL
         && (store = get_evp_method_store(libctx)) == NULL)
         return 0;

     return ossl_method_store_add(store, prov, meth_id, propdef, method,
                                  methdata->refcnt_up_method,
                                  methdata->destruct_method);
 }

 /*
  * The core fetching functionality passes the name of the implementation.
  * This function is responsible to getting an identity number for it.
  */
 static void *construct_evp_method(const OSSL_ALGORITHM *algodef,
                                   OSSL_PROVIDER *prov, void *data)
 {
     /*
      * This function is only called if get_evp_method_from_store() returned
      * NULL, so it's safe to say that of all the spots to create a new
      * namemap entry, this is it.  Should the name already exist there, we
      * know that ossl_namemap_add_name() will return its corresponding
      * number.
      */
     struct evp_method_data_st *methdata = data;
     OPENSSL_CTX *libctx = ossl_provider_library_context(prov);
     OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx);
     const char *names = algodef->algorithm_names;
     int name_id = ossl_namemap_add_names(namemap, 0, names, NAME_SEPARATOR);

     if (name_id == 0)
         return NULL;
     return methdata->method_from_dispatch(name_id, algodef->implementation,
                                           prov);
 }

 static void destruct_evp_method(void *method, void *data)
 {
     struct evp_method_data_st *methdata = data;

     methdata->destruct_method(method);
 }

 static void *
 inner_evp_generic_fetch(OPENSSL_CTX *libctx, int operation_id,
                         int name_id, const char *name,
                         const char *properties,
                         void *(*new_method)(int name_id,
                                             const OSSL_DISPATCH *fns,
                                             OSSL_PROVIDER *prov),
                         int (*up_ref_method)(void *),
                         void (*free_method)(void *))
 {
     OSSL_METHOD_STORE *store = get_evp_method_store(libctx);
     OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx);
     uint32_t meth_id = 0;
     void *method = NULL;

     if (store == NULL || namemap == NULL)
         return NULL;

     /*
      * If there's ever an operation_id == 0 passed, we have an internal
      * programming error.
      */
     if (!ossl_assert(operation_id > 0))
         return NULL;

     /*
      * If we have been passed neither a name_id or a name, we have an
      * internal programming error.
      */
     if (!ossl_assert(name_id != 0 || name != NULL))
         return NULL;

     /* If we haven't received a name id yet, try to get one for the name */
     if (name_id == 0)
         name_id = ossl_namemap_name2num(namemap, name);

     /*
      * If we have a name id, calculate a method id with evp_method_id().
      *
      * evp_method_id returns 0 if we have too many operations (more than
      * about 2^8) or too many names (more than about 2^24).  In that case,
      * we can't create any new method.
      */
     if (name_id != 0 && (meth_id = evp_method_id(name_id, operation_id)) == 0)
         return NULL;

     if (meth_id == 0
         || !ossl_method_store_cache_get(store, meth_id, properties, &method)) {
         OSSL_METHOD_CONSTRUCT_METHOD mcm = {
             alloc_tmp_evp_method_store,
             dealloc_tmp_evp_method_store,
             get_evp_method_from_store,
             put_evp_method_in_store,
             construct_evp_method,
             destruct_evp_method
         };
         struct evp_method_data_st mcmdata;

         mcmdata.mcm = &mcm;
         mcmdata.libctx = libctx;
         mcmdata.operation_id = operation_id;
         mcmdata.name_id = name_id;
         mcmdata.names = name;
         mcmdata.propquery = properties;
         mcmdata.method_from_dispatch = new_method;
         mcmdata.refcnt_up_method = up_ref_method;
         mcmdata.destruct_method = free_method;
         if ((method = ossl_method_construct(libctx, operation_id,
                                             0 /* !force_cache */,
                                             &mcm, &mcmdata)) != NULL) {
             /*
              * If construction did create a method for us, we know that
              * there is a correct name_id and meth_id, since those have
              * already been calculated in get_evp_method_from_store() and
              * put_evp_method_in_store() above.
              */
             if (name_id == 0)
                 name_id = ossl_namemap_name2num(namemap, name);
             meth_id = evp_method_id(name_id, operation_id);
             ossl_method_store_cache_set(store, meth_id, properties, method,
                                         up_ref_method, free_method);
         }
     }

     return method;
 }

 #ifndef FIPS_MODULE
 static const char *libctx_descriptor(OPENSSL_CTX *libctx)
 {
     if (openssl_ctx_is_global_default(libctx))
         return "Global default library context";
     if (openssl_ctx_is_default(libctx))
         return "Thread-local default library context";
     return "Non-default library context";
 }
 #endif

 void *evp_generic_fetch(OPENSSL_CTX *libctx, int operation_id,
                         const char *name, const char *properties,
                         void *(*new_method)(int name_id,
                                             const OSSL_DISPATCH *fns,
                                             OSSL_PROVIDER *prov),
                         int (*up_ref_method)(void *),
                         void (*free_method)(void *))
 {
     void *ret = inner_evp_generic_fetch(libctx,
                                         operation_id, 0, name, properties,
                                         new_method, up_ref_method, free_method);

     if (ret == NULL) {
         int code = EVP_R_FETCH_FAILED;

 #ifdef FIPS_MODULE
         ERR_raise(ERR_LIB_EVP, code);
 #else
         ERR_raise_data(ERR_LIB_EVP, code,
                        "%s, Algorithm (%s), Properties (%s)",
                        libctx_descriptor(libctx),
                        name = NULL ? "<null>" : name,
                        properties == NULL ? "<null>" : properties);
 #endif
     }
     return ret;
 }

 /*
  * evp_generic_fetch_by_number() is special, and only returns methods for
  * already known names, i.e. it refuses to work if no name_id can be found
  * (it's considered an internal programming error).
  * This is meant to be used when one method needs to fetch an associated
  * other method.
  */
 void *evp_generic_fetch_by_number(OPENSSL_CTX *libctx, int operation_id,
                                   int name_id, const char *properties,
                                   void *(*new_method)(int name_id,
                                                       const OSSL_DISPATCH *fns,
                                                       OSSL_PROVIDER *prov),
                                   int (*up_ref_method)(void *),
                                   void (*free_method)(void *))
 {
     void *ret = inner_evp_generic_fetch(libctx,
                                         operation_id, name_id, NULL,
                                         properties, new_method, up_ref_method,
                                         free_method);

     if (ret == NULL) {
         int code = EVP_R_FETCH_FAILED;

 #ifdef FIPS_MODULE
         ERR_raise(ERR_LIB_EVP, code);
 #else
         {
             OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx);
             const char *name = (namemap == NULL)
                                ? NULL
                                : ossl_namemap_num2name(namemap, name_id, 0);

             ERR_raise_data(ERR_LIB_EVP, code,
                            "%s, Algorithm (%s), Properties (%s)",
                            libctx_descriptor(libctx),
                            name = NULL ? "<null>" : name,
                            properties == NULL ? "<null>" : properties);
         }
 #endif
     }
     return ret;
 }

 static int evp_set_default_properties(OPENSSL_CTX *libctx,
                                       OSSL_PROPERTY_LIST *def_prop)
 {
     OSSL_METHOD_STORE *store = get_evp_method_store(libctx);
     OSSL_PROPERTY_LIST **plp = ossl_ctx_global_properties(libctx);

     if (plp != NULL) {
         ossl_property_free(*plp);
         *plp = def_prop;
         if (store != NULL)
             ossl_method_store_flush_cache(store);
         return 1;
     }
     EVPerr(0, ERR_R_INTERNAL_ERROR);
     return 0;
 }

 int EVP_set_default_properties(OPENSSL_CTX *libctx, const char *propq)
 {
     OSSL_PROPERTY_LIST *pl = NULL;

     if (propq != NULL && (pl = ossl_parse_query(libctx, propq)) == NULL) {
         EVPerr(0, EVP_R_DEFAULT_QUERY_PARSE_ERROR);
         return 0;
     }
     return evp_set_default_properties(libctx, pl);
 }


 static int evp_default_properties_merge(OPENSSL_CTX *libctx, const char *propq)
 {
     OSSL_PROPERTY_LIST **plp = ossl_ctx_global_properties(libctx);
     OSSL_PROPERTY_LIST *pl1, *pl2;

     if (propq == NULL)
         return 1;
     if (plp == NULL || *plp == NULL)
         return EVP_set_default_properties(libctx, propq);
     if ((pl1 = ossl_parse_query(libctx, propq)) == NULL) {
         EVPerr(0, EVP_R_DEFAULT_QUERY_PARSE_ERROR);
         return 0;
     }
     pl2 = ossl_property_merge(pl1, *plp);
     ossl_property_free(pl1);
     if (pl2 == NULL) {
         EVPerr(0, ERR_R_MALLOC_FAILURE);
         return 0;
     }
     return evp_set_default_properties(libctx, pl2);
 }

 static int evp_default_property_is_enabled(OPENSSL_CTX *libctx,
                                            const char *prop_name)
 {
     OSSL_PROPERTY_LIST **plp = ossl_ctx_global_properties(libctx);

     return plp != NULL && ossl_property_is_enabled(libctx, prop_name, *plp);
 }

 int EVP_default_properties_is_fips_enabled(OPENSSL_CTX *libctx)
 {
     return evp_default_property_is_enabled(libctx, "fips");
 }

 int EVP_default_properties_enable_fips(OPENSSL_CTX *libctx, int enable)
 {
     const char *query = (enable != 0) ? "fips=yes" : "-fips";

     return evp_default_properties_merge(libctx, query);
 }


 struct do_all_data_st {
     void (*user_fn)(void *method, void *arg);
     void *user_arg;
     void *(*new_method)(const int name_id, const OSSL_DISPATCH *fns,
                         OSSL_PROVIDER *prov);
     void (*free_method)(void *);
 };

 static void do_one(OSSL_PROVIDER *provider, const OSSL_ALGORITHM *algo,
                    int no_store, void *vdata)
 {
     struct do_all_data_st *data = vdata;
     OPENSSL_CTX *libctx = ossl_provider_library_context(provider);
     OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx);
     int name_id = ossl_namemap_add_names(namemap, 0, algo->algorithm_names,
                                          NAME_SEPARATOR);
     void *method = NULL;

     if (name_id != 0)
         method = data->new_method(name_id, algo->implementation, provider);

     if (method != NULL) {
         data->user_fn(method, data->user_arg);
         data->free_method(method);
     }
 }

 void evp_generic_do_all(OPENSSL_CTX *libctx, int operation_id,
                         void (*user_fn)(void *method, void *arg),
                         void *user_arg,
                         void *(*new_method)(int name_id,
                                             const OSSL_DISPATCH *fns,
                                             OSSL_PROVIDER *prov),
                         void (*free_method)(void *))
 {
     struct do_all_data_st data;

     data.new_method = new_method;
     data.free_method = free_method;
     data.user_fn = user_fn;
     data.user_arg = user_arg;

     /*
      * No pre- or post-condition for this call, as this only creates methods
      * temporarly and then promptly destroys them.
      */
     ossl_algorithm_do_all(libctx, operation_id, NULL, NULL, do_one, NULL,
                           &data);
 }

 const char *evp_first_name(const OSSL_PROVIDER *prov, int name_id)
 {
     OPENSSL_CTX *libctx = ossl_provider_library_context(prov);
     OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx);

     return ossl_namemap_num2name(namemap, name_id, 0);
 }

 int evp_is_a(OSSL_PROVIDER *prov, int number,
              const char *legacy_name, const char *name)
 {
     /*
      * For a |prov| that is NULL, the library context will be NULL
      */
     OPENSSL_CTX *libctx = ossl_provider_library_context(prov);
     OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx);

     if (prov == NULL)
         number = ossl_namemap_name2num(namemap, legacy_name);
     return ossl_namemap_name2num(namemap, name) == number;
 }

 void evp_names_do_all(OSSL_PROVIDER *prov, int number,
                       void (*fn)(const char *name, void *data),
                       void *data)
 {
     OPENSSL_CTX *libctx = ossl_provider_library_context(prov);
     OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx);

     ossl_namemap_doall_names(namemap, number, fn, data);
 }
	/*
	* Copyright 2019-2020 The OpenSSL Project Authors. 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
	*/

	#include <stddef.h>
	#include <openssl/types.h>
	#include <openssl/evp.h>
	#include <openssl/core.h>
	#include "internal/cryptlib.h"
	#include "internal/thread_once.h"
	#include "internal/property.h"
	#include "internal/core.h"
	#include "internal/provider.h"
	#include "internal/namemap.h"
	#include "crypto/evp.h" /* evp_local.h needs it */
	#include "evp_local.h"

	#define NAME_SEPARATOR ':'

	static void evp_method_store_free(void *vstore)
	{
	ossl_method_store_free(vstore);
	}

	static void evp_method_store_new(OPENSSL_CTX ctx)
	{
	return ossl_method_store_new(ctx);
	}


	static const OPENSSL_CTX_METHOD evp_method_store_method = {
	evp_method_store_new,
	evp_method_store_free,
	};

	/* Data to be passed through ossl_method_construct() */
	struct evp_method_data_st {
	OPENSSL_CTX *libctx;
	OSSL_METHOD_CONSTRUCT_METHOD *mcm;
	int operation_id; /* For get_evp_method_from_store() */
	int name_id; /* For get_evp_method_from_store() */
	const char names; / For get_evp_method_from_store() */
	const char propquery; / For get_evp_method_from_store() */
	void (method_from_dispatch)(int name_id, const OSSL_DISPATCH *,
	OSSL_PROVIDER *);
	int (refcnt_up_method)(void method);
	void (destruct_method)(void method);
	};

	/*
	* Generic routines to fetch / create EVP methods with ossl_method_construct()
	*/
	static void alloc_tmp_evp_method_store(OPENSSL_CTX ctx)
	{
	return ossl_method_store_new(ctx);
	}

	static void dealloc_tmp_evp_method_store(void *store)
	{
	if (store != NULL)
	ossl_method_store_free(store);
	}

	static OSSL_METHOD_STORE get_evp_method_store(OPENSSL_CTX libctx)
	{
	return openssl_ctx_get_data(libctx, OPENSSL_CTX_EVP_METHOD_STORE_INDEX,
	&evp_method_store_method);
	}

	/*
	* To identify the method in the EVP method store, we mix the name identity
	* with the operation identity, under the assumption that we don't have more
	* than 2^24 names or more than 2^8 operation types.
	*
	* The resulting identity is a 32-bit integer, composed like this:
	*
	* +---------24 bits--------+-8 bits-+
	* \| name identity \| op id \|
	* +------------------------+--------+
	*/
	static uint32_t evp_method_id(int name_id, unsigned int operation_id)
	{
	if (!ossl_assert(name_id > 0 && name_id < (1 << 24))
	\|\| !ossl_assert(operation_id > 0 && operation_id < (1 << 8)))
	return 0;
	return ((name_id << 8) & 0xFFFFFF00) \| (operation_id & 0x000000FF);
	}

	static void get_evp_method_from_store(OPENSSL_CTX libctx, void *store,
	void *data)
	{
	struct evp_method_data_st *methdata = data;
	void *method = NULL;
	int name_id;
	uint32_t meth_id;

	/*
	* get_evp_method_from_store() is only called to try and get the method
	* that evp_generic_fetch() is asking for, and the operation id as well
	* as the name or name id are passed via methdata.
	*/
	if ((name_id = methdata->name_id) == 0) {
	OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx);
	const char *names = methdata->names;
	const char *q = strchr(names, NAME_SEPARATOR);
	size_t l = (q == NULL ? strlen(names) : (size_t)(q - names));

	if (namemap == 0)
	return NULL;
	name_id = ossl_namemap_name2num_n(namemap, names, l);
	}

	if (name_id == 0
	\|\| (meth_id = evp_method_id(name_id, methdata->operation_id)) == 0)
	return NULL;

	if (store == NULL
	&& (store = get_evp_method_store(libctx)) == NULL)
	return NULL;

	if (!ossl_method_store_fetch(store, meth_id, methdata->propquery,
	&method))
	return NULL;
	return method;
	}

	static int put_evp_method_in_store(OPENSSL_CTX libctx, void store,
	void method, const OSSL_PROVIDER prov,
	int operation_id, const char *names,
	const char propdef, void data)
	{
	struct evp_method_data_st *methdata = data;
	OSSL_NAMEMAP *namemap;
	int name_id;
	uint32_t meth_id;
	size_t l = 0;

	/*
	* put_evp_method_in_store() is only called with an EVP method that was
	* successfully created by construct_method() below, which means that
	* all the names should already be stored in the namemap with the same
	* numeric identity, so just use the first to get that identity.
	*/
	if (names != NULL) {
	const char *q = strchr(names, NAME_SEPARATOR);

	l = (q == NULL ? strlen(names) : (size_t)(q - names));
	}

	if ((namemap = ossl_namemap_stored(libctx)) == NULL
	\|\| (name_id = ossl_namemap_name2num_n(namemap, names, l)) == 0
	\|\| (meth_id = evp_method_id(name_id, operation_id)) == 0)
	return 0;

	if (store == NULL
	&& (store = get_evp_method_store(libctx)) == NULL)
	return 0;

	return ossl_method_store_add(store, prov, meth_id, propdef, method,
	methdata->refcnt_up_method,
	methdata->destruct_method);
	}

	/*
	* The core fetching functionality passes the name of the implementation.
	* This function is responsible to getting an identity number for it.
	*/
	static void construct_evp_method(const OSSL_ALGORITHM algodef,
	OSSL_PROVIDER prov, void data)
	{
	/*
	* This function is only called if get_evp_method_from_store() returned
	* NULL, so it's safe to say that of all the spots to create a new
	* namemap entry, this is it. Should the name already exist there, we
	* know that ossl_namemap_add_name() will return its corresponding
	* number.
	*/
	struct evp_method_data_st *methdata = data;
	OPENSSL_CTX *libctx = ossl_provider_library_context(prov);
	OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx);
	const char *names = algodef->algorithm_names;
	int name_id = ossl_namemap_add_names(namemap, 0, names, NAME_SEPARATOR);

	if (name_id == 0)
	return NULL;
	return methdata->method_from_dispatch(name_id, algodef->implementation,
	prov);
	}

	static void destruct_evp_method(void method, void data)
	{
	struct evp_method_data_st *methdata = data;

	methdata->destruct_method(method);
	}

	static void *
	inner_evp_generic_fetch(OPENSSL_CTX *libctx, int operation_id,
	int name_id, const char *name,
	const char *properties,
	void (new_method)(int name_id,
	const OSSL_DISPATCH *fns,
	OSSL_PROVIDER *prov),
	int (up_ref_method)(void ),
	void (free_method)(void ))
	{
	OSSL_METHOD_STORE *store = get_evp_method_store(libctx);
	OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx);
	uint32_t meth_id = 0;
	void *method = NULL;

	if (store == NULL \|\| namemap == NULL)
	return NULL;

	/*
	* If there's ever an operation_id == 0 passed, we have an internal
	* programming error.
	*/
	if (!ossl_assert(operation_id > 0))
	return NULL;

	/*
	* If we have been passed neither a name_id or a name, we have an
	* internal programming error.
	*/
	if (!ossl_assert(name_id != 0 \|\| name != NULL))
	return NULL;

	/* If we haven't received a name id yet, try to get one for the name */
	if (name_id == 0)
	name_id = ossl_namemap_name2num(namemap, name);

	/*
	* If we have a name id, calculate a method id with evp_method_id().
	*
	* evp_method_id returns 0 if we have too many operations (more than
	* about 2^8) or too many names (more than about 2^24). In that case,
	* we can't create any new method.
	*/
	if (name_id != 0 && (meth_id = evp_method_id(name_id, operation_id)) == 0)
	return NULL;

	if (meth_id == 0
	\|\| !ossl_method_store_cache_get(store, meth_id, properties, &method)) {
	OSSL_METHOD_CONSTRUCT_METHOD mcm = {
	alloc_tmp_evp_method_store,
	dealloc_tmp_evp_method_store,
	get_evp_method_from_store,
	put_evp_method_in_store,
	construct_evp_method,
	destruct_evp_method
	};
	struct evp_method_data_st mcmdata;

	mcmdata.mcm = &mcm;
	mcmdata.libctx = libctx;
	mcmdata.operation_id = operation_id;
	mcmdata.name_id = name_id;
	mcmdata.names = name;
	mcmdata.propquery = properties;
	mcmdata.method_from_dispatch = new_method;
	mcmdata.refcnt_up_method = up_ref_method;
	mcmdata.destruct_method = free_method;
	if ((method = ossl_method_construct(libctx, operation_id,
	0 /* !force_cache */,
	&mcm, &mcmdata)) != NULL) {
	/*
	* If construction did create a method for us, we know that
	* there is a correct name_id and meth_id, since those have
	* already been calculated in get_evp_method_from_store() and
	* put_evp_method_in_store() above.
	*/
	if (name_id == 0)
	name_id = ossl_namemap_name2num(namemap, name);
	meth_id = evp_method_id(name_id, operation_id);
	ossl_method_store_cache_set(store, meth_id, properties, method,
	up_ref_method, free_method);
	}
	}

	return method;
	}

	#ifndef FIPS_MODULE
	static const char libctx_descriptor(OPENSSL_CTX libctx)
	{
	if (openssl_ctx_is_global_default(libctx))
	return "Global default library context";
	if (openssl_ctx_is_default(libctx))
	return "Thread-local default library context";
	return "Non-default library context";
	}
	#endif

	void evp_generic_fetch(OPENSSL_CTX libctx, int operation_id,
	const char name, const char properties,
	void (new_method)(int name_id,
	const OSSL_DISPATCH *fns,
	OSSL_PROVIDER *prov),
	int (up_ref_method)(void ),
	void (free_method)(void ))
	{
	void *ret = inner_evp_generic_fetch(libctx,
	operation_id, 0, name, properties,
	new_method, up_ref_method, free_method);

	if (ret == NULL) {
	int code = EVP_R_FETCH_FAILED;

	#ifdef FIPS_MODULE
	ERR_raise(ERR_LIB_EVP, code);
	#else
	ERR_raise_data(ERR_LIB_EVP, code,
	"%s, Algorithm (%s), Properties (%s)",
	libctx_descriptor(libctx),
	name = NULL ? "<null>" : name,
	properties == NULL ? "<null>" : properties);
	#endif
	}
	return ret;
	}

	/*
	* evp_generic_fetch_by_number() is special, and only returns methods for
	* already known names, i.e. it refuses to work if no name_id can be found
	* (it's considered an internal programming error).
	* This is meant to be used when one method needs to fetch an associated
	* other method.
	*/
	void evp_generic_fetch_by_number(OPENSSL_CTX libctx, int operation_id,
	int name_id, const char *properties,
	void (new_method)(int name_id,
	const OSSL_DISPATCH *fns,
	OSSL_PROVIDER *prov),
	int (up_ref_method)(void ),
	void (free_method)(void ))
	{
	void *ret = inner_evp_generic_fetch(libctx,
	operation_id, name_id, NULL,
	properties, new_method, up_ref_method,
	free_method);

	if (ret == NULL) {
	int code = EVP_R_FETCH_FAILED;

	#ifdef FIPS_MODULE
	ERR_raise(ERR_LIB_EVP, code);
	#else
	{
	OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx);
	const char *name = (namemap == NULL)
	? NULL
	: ossl_namemap_num2name(namemap, name_id, 0);

	ERR_raise_data(ERR_LIB_EVP, code,
	"%s, Algorithm (%s), Properties (%s)",
	libctx_descriptor(libctx),
	name = NULL ? "<null>" : name,
	properties == NULL ? "<null>" : properties);
	}
	#endif
	}
	return ret;
	}

	static int evp_set_default_properties(OPENSSL_CTX *libctx,
	OSSL_PROPERTY_LIST *def_prop)
	{
	OSSL_METHOD_STORE *store = get_evp_method_store(libctx);
	OSSL_PROPERTY_LIST **plp = ossl_ctx_global_properties(libctx);

	if (plp != NULL) {
	ossl_property_free(*plp);
	*plp = def_prop;
	if (store != NULL)
	ossl_method_store_flush_cache(store);
	return 1;
	}
	EVPerr(0, ERR_R_INTERNAL_ERROR);
	return 0;
	}

	int EVP_set_default_properties(OPENSSL_CTX libctx, const char propq)
	{
	OSSL_PROPERTY_LIST *pl = NULL;

	if (propq != NULL && (pl = ossl_parse_query(libctx, propq)) == NULL) {
	EVPerr(0, EVP_R_DEFAULT_QUERY_PARSE_ERROR);
	return 0;
	}
	return evp_set_default_properties(libctx, pl);
	}


	static int evp_default_properties_merge(OPENSSL_CTX libctx, const char propq)
	{
	OSSL_PROPERTY_LIST **plp = ossl_ctx_global_properties(libctx);
	OSSL_PROPERTY_LIST pl1, pl2;

	if (propq == NULL)
	return 1;
	if (plp == NULL \|\| *plp == NULL)
	return EVP_set_default_properties(libctx, propq);
	if ((pl1 = ossl_parse_query(libctx, propq)) == NULL) {
	EVPerr(0, EVP_R_DEFAULT_QUERY_PARSE_ERROR);
	return 0;
	}
	pl2 = ossl_property_merge(pl1, *plp);
	ossl_property_free(pl1);
	if (pl2 == NULL) {
	EVPerr(0, ERR_R_MALLOC_FAILURE);
	return 0;
	}
	return evp_set_default_properties(libctx, pl2);
	}

	static int evp_default_property_is_enabled(OPENSSL_CTX *libctx,
	const char *prop_name)
	{
	OSSL_PROPERTY_LIST **plp = ossl_ctx_global_properties(libctx);

	return plp != NULL && ossl_property_is_enabled(libctx, prop_name, *plp);
	}

	int EVP_default_properties_is_fips_enabled(OPENSSL_CTX *libctx)
	{
	return evp_default_property_is_enabled(libctx, "fips");
	}

	int EVP_default_properties_enable_fips(OPENSSL_CTX *libctx, int enable)
	{
	const char *query = (enable != 0) ? "fips=yes" : "-fips";

	return evp_default_properties_merge(libctx, query);
	}


	struct do_all_data_st {
	void (user_fn)(void method, void *arg);
	void *user_arg;
	void (new_method)(const int name_id, const OSSL_DISPATCH *fns,
	OSSL_PROVIDER *prov);
	void (free_method)(void );
	};

	static void do_one(OSSL_PROVIDER provider, const OSSL_ALGORITHM algo,
	int no_store, void *vdata)
	{
	struct do_all_data_st *data = vdata;
	OPENSSL_CTX *libctx = ossl_provider_library_context(provider);
	OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx);
	int name_id = ossl_namemap_add_names(namemap, 0, algo->algorithm_names,
	NAME_SEPARATOR);
	void *method = NULL;

	if (name_id != 0)
	method = data->new_method(name_id, algo->implementation, provider);

	if (method != NULL) {
	data->user_fn(method, data->user_arg);
	data->free_method(method);
	}
	}

	void evp_generic_do_all(OPENSSL_CTX *libctx, int operation_id,
	void (user_fn)(void method, void *arg),
	void *user_arg,
	void (new_method)(int name_id,
	const OSSL_DISPATCH *fns,
	OSSL_PROVIDER *prov),
	void (free_method)(void ))
	{
	struct do_all_data_st data;

	data.new_method = new_method;
	data.free_method = free_method;
	data.user_fn = user_fn;
	data.user_arg = user_arg;

	/*
	* No pre- or post-condition for this call, as this only creates methods
	* temporarly and then promptly destroys them.
	*/
	ossl_algorithm_do_all(libctx, operation_id, NULL, NULL, do_one, NULL,
	&data);
	}

	const char evp_first_name(const OSSL_PROVIDER prov, int name_id)
	{
	OPENSSL_CTX *libctx = ossl_provider_library_context(prov);
	OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx);

	return ossl_namemap_num2name(namemap, name_id, 0);
	}

	int evp_is_a(OSSL_PROVIDER *prov, int number,
	const char legacy_name, const char name)
	{
	/*
	* For a \|prov\| that is NULL, the library context will be NULL
	*/
	OPENSSL_CTX *libctx = ossl_provider_library_context(prov);
	OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx);

	if (prov == NULL)
	number = ossl_namemap_name2num(namemap, legacy_name);
	return ossl_namemap_name2num(namemap, name) == number;
	}

	void evp_names_do_all(OSSL_PROVIDER *prov, int number,
	void (fn)(const char name, void *data),
	void *data)
	{
	OPENSSL_CTX *libctx = ossl_provider_library_context(prov);
	OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx);

	ossl_namemap_doall_names(namemap, number, fn, data);
	}