[thirdparty/openssl.git] / crypto / evp / evp_fetch.c

/*
 * Copyright 2019 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 default_method_store_free(void *vstore)
{
    ossl_method_store_free(vstore);
}

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


static const OPENSSL_CTX_METHOD default_method_store_method = {
    default_method_store_new,
    default_method_store_free,
};

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

static int add_names_to_namemap(OSSL_NAMEMAP *namemap,
                                const char *names)
{
    const char *p, *q;
    size_t l;
    int id = 0;

    /* Check that we have a namemap and that there is at least one name */
    if (namemap == NULL) {
        ERR_raise(ERR_LIB_EVP, ERR_R_PASSED_NULL_PARAMETER);
        return 0;
    }

    /*
     * Check that no name is an empty string, and that all names have at
     * most one numeric identity together.
     */
    for (p = names; *p != '\0'; p = (q == NULL ? p + l : q + 1)) {
        int this_id;

        if ((q = strchr(p, NAME_SEPARATOR)) == NULL)
            l = strlen(p);       /* offset to \0 */
        else
            l = q - p;           /* offset to the next separator */

        this_id = ossl_namemap_name2num_n(namemap, p, l);

        if (*p == '\0' || *p == NAME_SEPARATOR) {
            ERR_raise(ERR_LIB_EVP, EVP_R_BAD_ALGORITHM_NAME);
            return 0;
        }
        if (id == 0)
            id = this_id;
        else if (this_id != 0 && this_id != id) {
            ERR_raise_data(ERR_LIB_EVP, EVP_R_CONFLICTING_ALGORITHM_NAME,
                           "\"%.*s\" has an existing different identity %d (from \"%s\")",
                           l, p, this_id, names);
            return 0;
        }
    }

    /* Now that we have checked, register all names */
    for (p = names; *p != '\0'; p = (q == NULL ? p + l : q + 1)) {
        int this_id;

        if ((q = strchr(p, NAME_SEPARATOR)) == NULL)
            l = strlen(p);       /* offset to \0 */
        else
            l = q - p;           /* offset to the next separator */

        this_id = ossl_namemap_add_n(namemap, id, p, l);
        if (id == 0)
            id = this_id;
        else if (this_id != id) {
            ERR_raise_data(ERR_LIB_EVP, ERR_R_INTERNAL_ERROR,
                           "Got id %d when expecting %d", this_id, id);
            return 0;
        }
    }

    return id;
}

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

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

static OSSL_METHOD_STORE *get_default_method_store(OPENSSL_CTX *libctx)
{
    return openssl_ctx_get_data(libctx, OPENSSL_CTX_DEFAULT_METHOD_STORE_INDEX,
                                &default_method_store_method);
}

/*
 * To identity the method in the method store, we mix the name identity
 * with the operation identity, with 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 method_id(unsigned int operation_id, int name_id)
{
    if (!ossl_assert(name_id < (1 << 24) || operation_id < (1 << 8))
        || !ossl_assert(name_id > 0 && operation_id > 0))
        return 0;
    return ((name_id << 8) & 0xFFFFFF00) | (operation_id & 0x000000FF);
}

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

    /*
     * get_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 = method_id(methdata->operation_id, name_id)) == 0)
        return NULL;

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

    (void)ossl_method_store_fetch(store, meth_id, methdata->propquery,
                                  &method);

    if (method != NULL
        && !methdata->refcnt_up_method(method)) {
        method = NULL;
    }
    return method;
}

static int put_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 method_data_st *methdata = data;
    OSSL_NAMEMAP *namemap;
    int name_id;
    uint32_t meth_id;
    size_t l = 0;

    /*
     * put_method_in_store() is only called with a 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 = method_id(operation_id, name_id)) == 0)
        return 0;

    if (store == NULL
        && (store = get_default_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_method(const char *names, const OSSL_DISPATCH *fns,
                              OSSL_PROVIDER *prov, void *data)
{
    /*
     * This function is only called if get_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() will return its corresponding number.
     */
    struct method_data_st *methdata = data;
    OPENSSL_CTX *libctx = ossl_provider_library_context(prov);
    OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx);
    int name_id = add_names_to_namemap(namemap, names);

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

static void destruct_method(void *method, void *data)
{
    struct method_data_st *methdata = data;

    methdata->destruct_method(method);
}

static void *inner_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,
                                                     void *method_data),
                                 void *method_data,
                                 int (*up_ref_method)(void *),
                                 void (*free_method)(void *))
{
    OSSL_METHOD_STORE *store = get_default_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 method_id().
     *
     * 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 = method_id(operation_id, name_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_method_store,
            dealloc_tmp_method_store,
            get_method_from_store,
            put_method_in_store,
            construct_method,
            destruct_method
        };
        struct 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.destruct_method = free_method;
        mcmdata.refcnt_up_method = up_ref_method;
        mcmdata.destruct_method = free_method;
        mcmdata.method_data = method_data;
        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 methodid, since those have
             * already been calculated in get_method_from_store() and
             * put_method_in_store() above.
             */
            if (name_id == 0)
                name_id = ossl_namemap_name2num(namemap, name);
            meth_id = method_id(operation_id, name_id);
            ossl_method_store_cache_set(store, meth_id, properties, method);
        }
    } else {
        up_ref_method(method);
    }

    return method;
}

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,
                                            void *method_data),
                        void *method_data,
                        int (*up_ref_method)(void *),
                        void (*free_method)(void *))
{
    return inner_generic_fetch(libctx,
                               operation_id, 0, name, properties,
                               new_method, method_data,
                               up_ref_method, free_method);
}

/*
 * 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,
                                                      void *method_data),
                                  void *method_data,
                                  int (*up_ref_method)(void *),
                                  void (*free_method)(void *))
{
    return inner_generic_fetch(libctx,
                               operation_id, name_id, NULL, properties,
                               new_method, method_data,
                               up_ref_method, free_method);
}

int EVP_set_default_properties(OPENSSL_CTX *libctx, const char *propq)
{
    OSSL_METHOD_STORE *store = get_default_method_store(libctx);

    if (store != NULL)
        return ossl_method_store_set_global_properties(store, propq);
    EVPerr(EVP_F_EVP_SET_DEFAULT_PROPERTIES, ERR_R_INTERNAL_ERROR);
    return 0;
}

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 *method_data);
    void *method_data;
    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 = add_names_to_namemap(namemap, algo->algorithm_names);
    void *method = NULL;

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

    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 *method_data),
                        void *method_data,
                        void (*free_method)(void *))
{
    struct do_all_data_st data;

    data.new_method = new_method;
    data.method_data = method_data;
    data.free_method = free_method;
    data.user_fn = user_fn;
    data.user_arg = user_arg;
    ossl_algorithm_do_all(libctx, operation_id, NULL, do_one, &data);
}

const char *evp_first_name(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 *name)
{
    OPENSSL_CTX *libctx = ossl_provider_library_context(prov);
    OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx);

    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);
}
Commit	Line	Data
c13d2ab4 RL	1	/*
	2	* Copyright 2019 The OpenSSL Project Authors. All Rights Reserved.
	3	*
	4	* Licensed under the Apache License 2.0 (the "License"). You may not use
	5	* this file except in compliance with the License. You can obtain a copy
	6	* in the file LICENSE in the source distribution or at
	7	* https://www.openssl.org/source/license.html
	8	*/
	9
	10	#include <stddef.h>
50cd4768	11	#include <openssl/types.h>
c13d2ab4 RL	12	#include <openssl/evp.h>
	13	#include <openssl/core.h>
	14	#include "internal/cryptlib.h"
	15	#include "internal/thread_once.h"
c13d2ab4 RL	16	#include "internal/property.h"
c13d2ab4 RL	17	#include "internal/core.h"
f7c16d48	18	#include "internal/provider.h"
baff732d	19	#include "internal/namemap.h"
706457b7 DMSP	20	#include "crypto/evp.h" /* evp_local.h needs it */
706457b7 DMSP	21	#include "evp_local.h"
c13d2ab4	22
695d195b RL	23	#define NAME_SEPARATOR ':'
695d195b RL	24
c13d2ab4 RL	25	static void default_method_store_free(void *vstore)
	26	{
	27	ossl_method_store_free(vstore);
	28	}
	29
1aedc35f	30	static void default_method_store_new(OPENSSL_CTX ctx)
c13d2ab4	31	{
1aedc35f	32	return ossl_method_store_new(ctx);
c13d2ab4 RL	33	}
	34
	35
	36	static const OPENSSL_CTX_METHOD default_method_store_method = {
	37	default_method_store_new,
	38	default_method_store_free,
	39	};
	40
c13d2ab4 RL	41	/* Data to be passed through ossl_method_construct() */
c13d2ab4 RL	42	struct method_data_st {
baff732d	43	OPENSSL_CTX *libctx;
c13d2ab4	44	OSSL_METHOD_CONSTRUCT_METHOD *mcm;
f7c16d48 RL	45	int operation_id; /* For get_method_from_store() */
f7c16d48 RL	46	int name_id; /* For get_method_from_store() */
695d195b	47	const char names; / For get_method_from_store() */
f7c16d48 RL	48	const char propquery; / For get_method_from_store() */
f7c16d48 RL	49	void (method_from_dispatch)(int name_id, const OSSL_DISPATCH *,
3ca9d210 RL	50	OSSL_PROVIDER , void );
3ca9d210 RL	51	void *method_data;
c13d2ab4 RL	52	int (refcnt_up_method)(void method);
	53	void (destruct_method)(void method);
	54	};
	55
695d195b RL	56	static int add_names_to_namemap(OSSL_NAMEMAP *namemap,
	57	const char *names)
	58	{
	59	const char p, q;
	60	size_t l;
	61	int id = 0;
	62
	63	/* Check that we have a namemap and that there is at least one name */
	64	if (namemap == NULL) {
	65	ERR_raise(ERR_LIB_EVP, ERR_R_PASSED_NULL_PARAMETER);
	66	return 0;
	67	}
	68
	69	/*
	70	* Check that no name is an empty string, and that all names have at
	71	* most one numeric identity together.
	72	*/
	73	for (p = names; *p != '\0'; p = (q == NULL ? p + l : q + 1)) {
	74	int this_id;
	75
	76	if ((q = strchr(p, NAME_SEPARATOR)) == NULL)
	77	l = strlen(p); /* offset to \0 */
	78	else
	79	l = q - p; /* offset to the next separator */
	80
	81	this_id = ossl_namemap_name2num_n(namemap, p, l);
	82
	83	if (p == '\0' \|\| p == NAME_SEPARATOR) {
	84	ERR_raise(ERR_LIB_EVP, EVP_R_BAD_ALGORITHM_NAME);
	85	return 0;
	86	}
	87	if (id == 0)
	88	id = this_id;
	89	else if (this_id != 0 && this_id != id) {
	90	ERR_raise_data(ERR_LIB_EVP, EVP_R_CONFLICTING_ALGORITHM_NAME,
	91	"\"%.*s\" has an existing different identity %d (from \"%s\")",
	92	l, p, this_id, names);
	93	return 0;
	94	}
	95	}
	96
	97	/* Now that we have checked, register all names */
	98	for (p = names; *p != '\0'; p = (q == NULL ? p + l : q + 1)) {
	99	int this_id;
	100
	101	if ((q = strchr(p, NAME_SEPARATOR)) == NULL)
	102	l = strlen(p); /* offset to \0 */
	103	else
	104	l = q - p; /* offset to the next separator */
	105
	106	this_id = ossl_namemap_add_n(namemap, id, p, l);
	107	if (id == 0)
	108	id = this_id;
	109	else if (this_id != id) {
	110	ERR_raise_data(ERR_LIB_EVP, ERR_R_INTERNAL_ERROR,
	111	"Got id %d when expecting %d", this_id, id);
	112	return 0;
	113	}
	114	}
	115
	116	return id;
	117	}
	118
c13d2ab4 RL	119	/*
	120	* Generic routines to fetch / create EVP methods with ossl_method_construct()
	121	*/
1aedc35f	122	static void alloc_tmp_method_store(OPENSSL_CTX ctx)
c13d2ab4	123	{
1aedc35f	124	return ossl_method_store_new(ctx);
c13d2ab4 RL	125	}
	126
	127	static void dealloc_tmp_method_store(void *store)
	128	{
	129	if (store != NULL)
	130	ossl_method_store_free(store);
	131	}
	132
cb929645	133	static OSSL_METHOD_STORE get_default_method_store(OPENSSL_CTX libctx)
c13d2ab4	134	{
1aedc35f MC	135	return openssl_ctx_get_data(libctx, OPENSSL_CTX_DEFAULT_METHOD_STORE_INDEX,
1aedc35f MC	136	&default_method_store_method);
c13d2ab4 RL	137	}
c13d2ab4 RL	138
2ccb1b4e RL	139	/*
	140	* To identity the method in the method store, we mix the name identity
	141	* with the operation identity, with the assumption that we don't have
	142	* more than 2^24 names or more than 2^8 operation types.
	143	*
	144	* The resulting identity is a 32-bit integer, composed like this:
	145	*
	146	* +---------24 bits--------+-8 bits-+
	147	* \| name identity \| op id \|
	148	* +------------------------+--------+
	149	*/
f7c16d48	150	static uint32_t method_id(unsigned int operation_id, int name_id)
2ccb1b4e RL	151	{
	152	if (!ossl_assert(name_id < (1 << 24) \|\| operation_id < (1 << 8))
	153	\|\| !ossl_assert(name_id > 0 && operation_id > 0))
	154	return 0;
	155	return ((name_id << 8) & 0xFFFFFF00) \| (operation_id & 0x000000FF);
	156	}
	157
c13d2ab4	158	static void get_method_from_store(OPENSSL_CTX libctx, void *store,
f7c16d48	159	void *data)
c13d2ab4 RL	160	{
	161	struct method_data_st *methdata = data;
	162	void *method = NULL;
f7c16d48 RL	163	int name_id;
f7c16d48 RL	164	uint32_t meth_id;
c13d2ab4	165
f7c16d48 RL	166	/*
	167	* get_method_from_store() is only called to try and get the method
	168	* that evp_generic_fetch() is asking for, and the operation id as
	169	* well as the name or name id are passed via methdata.
	170	*/
	171	if ((name_id = methdata->name_id) == 0) {
	172	OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx);
695d195b RL	173	const char *names = methdata->names;
	174	const char *q = strchr(names, NAME_SEPARATOR);
	175	size_t l = (q == NULL ? strlen(names) : (size_t)(q - names));
f7c16d48 RL	176
	177	if (namemap == 0)
	178	return NULL;
695d195b	179	name_id = ossl_namemap_name2num_n(namemap, names, l);
f7c16d48 RL	180	}
	181
	182	if (name_id == 0
	183	\|\| (meth_id = method_id(methdata->operation_id, name_id)) == 0)
c13d2ab4 RL	184	return NULL;
c13d2ab4 RL	185
f7c16d48 RL	186	if (store == NULL
f7c16d48 RL	187	&& (store = get_default_method_store(libctx)) == NULL)
2e49c054 RL	188	return NULL;
2e49c054 RL	189
f7c16d48 RL	190	(void)ossl_method_store_fetch(store, meth_id, methdata->propquery,
f7c16d48 RL	191	&method);
c13d2ab4 RL	192
	193	if (method != NULL
	194	&& !methdata->refcnt_up_method(method)) {
	195	method = NULL;
	196	}
	197	return method;
	198	}
	199
	200	static int put_method_in_store(OPENSSL_CTX libctx, void store,
c1d56231	201	void method, const OSSL_PROVIDER prov,
695d195b	202	int operation_id, const char *names,
c1d56231	203	const char propdef, void data)
c13d2ab4 RL	204	{
c13d2ab4 RL	205	struct method_data_st *methdata = data;
2e49c054	206	OSSL_NAMEMAP *namemap;
f7c16d48 RL	207	int name_id;
f7c16d48 RL	208	uint32_t meth_id;
695d195b	209	size_t l = 0;
dc46e3dd	210
f7c16d48 RL	211	/*
	212	* put_method_in_store() is only called with a method that was
	213	* successfully created by construct_method() below, which means
695d195b RL	214	* that all the names should already be stored in the namemap with
	215	* the same numeric identity, so just use the first to get that
	216	* identity.
f7c16d48	217	*/
695d195b RL	218	if (names != NULL) {
	219	const char *q = strchr(names, NAME_SEPARATOR);
	220
	221	l = (q == NULL ? strlen(names) : (size_t)(q - names));
	222	}
	223
f7c16d48	224	if ((namemap = ossl_namemap_stored(libctx)) == NULL
695d195b	225	\|\| (name_id = ossl_namemap_name2num_n(namemap, names, l)) == 0
f7c16d48	226	\|\| (meth_id = method_id(operation_id, name_id)) == 0)
dc46e3dd	227	return 0;
c13d2ab4 RL	228
	229	if (store == NULL
	230	&& (store = get_default_method_store(libctx)) == NULL)
	231	return 0;
	232
f7c16d48	233	return ossl_method_store_add(store, prov, meth_id, propdef, method,
b1d40ddf RL	234	methdata->refcnt_up_method,
b1d40ddf RL	235	methdata->destruct_method);
c13d2ab4 RL	236	}
c13d2ab4 RL	237
f7c16d48 RL	238	/*
	239	* The core fetching functionality passes the name of the implementation.
	240	* This function is responsible to getting an identity number for it.
	241	*/
695d195b	242	static void construct_method(const char names, const OSSL_DISPATCH *fns,
2e49c054	243	OSSL_PROVIDER prov, void data)
c13d2ab4	244	{
f7c16d48 RL	245	/*
	246	* This function is only called if get_method_from_store() returned
	247	* NULL, so it's safe to say that of all the spots to create a new
	248	* namemap entry, this is it. Should the name already exist there, we
	249	* know that ossl_namemap_add() will return its corresponding number.
f7c16d48	250	*/
c13d2ab4	251	struct method_data_st *methdata = data;
f7c16d48 RL	252	OPENSSL_CTX *libctx = ossl_provider_library_context(prov);
f7c16d48 RL	253	OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx);
695d195b	254	int name_id = add_names_to_namemap(namemap, names);
c13d2ab4	255
695d195b RL	256	if (name_id == 0)
695d195b RL	257	return NULL;
f7c16d48	258	return methdata->method_from_dispatch(name_id, fns, prov,
3ca9d210	259	methdata->method_data);
c13d2ab4 RL	260	}
	261
	262	static void destruct_method(void method, void data)
	263	{
	264	struct method_data_st *methdata = data;
	265
	266	methdata->destruct_method(method);
	267	}
	268
f7c16d48 RL	269	static void inner_generic_fetch(OPENSSL_CTX libctx, int operation_id,
	270	int name_id, const char *name,
	271	const char *properties,
	272	void (new_method)(int name_id,
	273	const OSSL_DISPATCH *fns,
	274	OSSL_PROVIDER *prov,
	275	void *method_data),
	276	void *method_data,
	277	int (up_ref_method)(void ),
	278	void (free_method)(void ))
c13d2ab4	279	{
e019da7b	280	OSSL_METHOD_STORE *store = get_default_method_store(libctx);
baff732d	281	OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx);
f7c16d48	282	uint32_t meth_id = 0;
c13d2ab4 RL	283	void *method = NULL;
c13d2ab4 RL	284
baff732d	285	if (store == NULL \|\| namemap == NULL)
e019da7b RL	286	return NULL;
e019da7b RL	287
2ccb1b4e RL	288	/*
	289	* If there's ever an operation_id == 0 passed, we have an internal
	290	* programming error.
	291	*/
	292	if (!ossl_assert(operation_id > 0))
	293	return NULL;
	294
	295	/*
f7c16d48 RL	296	* If we have been passed neither a name_id or a name, we have an
	297	* internal programming error.
	298	*/
	299	if (!ossl_assert(name_id != 0 \|\| name != NULL))
	300	return NULL;
	301
	302	/* If we haven't received a name id yet, try to get one for the name */
	303	if (name_id == 0)
	304	name_id = ossl_namemap_name2num(namemap, name);
	305
	306	/*
	307	* If we have a name id, calculate a method id with method_id().
	308	*
2ccb1b4e RL	309	* method_id returns 0 if we have too many operations (more than
	310	* about 2^8) or too many names (more than about 2^24). In that
	311	* case, we can't create any new method.
	312	*/
f7c16d48	313	if (name_id != 0 && (meth_id = method_id(operation_id, name_id)) == 0)
2ccb1b4e RL	314	return NULL;
2ccb1b4e RL	315
f7c16d48 RL	316	if (meth_id == 0
f7c16d48 RL	317	\|\| !ossl_method_store_cache_get(store, meth_id, properties, &method)) {
c13d2ab4 RL	318	OSSL_METHOD_CONSTRUCT_METHOD mcm = {
	319	alloc_tmp_method_store,
	320	dealloc_tmp_method_store,
	321	get_method_from_store,
	322	put_method_in_store,
	323	construct_method,
	324	destruct_method
	325	};
	326	struct method_data_st mcmdata;
	327
c13d2ab4	328	mcmdata.mcm = &mcm;
baff732d	329	mcmdata.libctx = libctx;
f7c16d48 RL	330	mcmdata.operation_id = operation_id;
f7c16d48 RL	331	mcmdata.name_id = name_id;
695d195b	332	mcmdata.names = name;
f7c16d48	333	mcmdata.propquery = properties;
c13d2ab4 RL	334	mcmdata.method_from_dispatch = new_method;
c13d2ab4 RL	335	mcmdata.destruct_method = free_method;
7c95390e	336	mcmdata.refcnt_up_method = up_ref_method;
c13d2ab4	337	mcmdata.destruct_method = free_method;
3ca9d210	338	mcmdata.method_data = method_data;
f7c16d48 RL	339	if ((method = ossl_method_construct(libctx, operation_id,
f7c16d48 RL	340	0 /* !force_cache */,
08607613	341	&mcm, &mcmdata)) != NULL) {
2ccb1b4e RL	342	/*
2ccb1b4e RL	343	* If construction did create a method for us, we know that
f7c16d48	344	* there is a correct name_id and methodid, since those have
2ccb1b4e RL	345	* already been calculated in get_method_from_store() and
	346	* put_method_in_store() above.
	347	*/
f7c16d48 RL	348	if (name_id == 0)
	349	name_id = ossl_namemap_name2num(namemap, name);
	350	meth_id = method_id(operation_id, name_id);
	351	ossl_method_store_cache_set(store, meth_id, properties, method);
2ccb1b4e	352	}
e019da7b	353	} else {
7c95390e	354	up_ref_method(method);
c13d2ab4 RL	355	}
	356
	357	return method;
	358	}
cb929645	359
f7c16d48 RL	360	void evp_generic_fetch(OPENSSL_CTX libctx, int operation_id,
	361	const char name, const char properties,
	362	void (new_method)(int name_id,
	363	const OSSL_DISPATCH *fns,
	364	OSSL_PROVIDER *prov,
	365	void *method_data),
	366	void *method_data,
	367	int (up_ref_method)(void ),
	368	void (free_method)(void ))
	369	{
	370	return inner_generic_fetch(libctx,
	371	operation_id, 0, name, properties,
	372	new_method, method_data,
	373	up_ref_method, free_method);
	374	}
	375
	376	/*
	377	* evp_generic_fetch_by_number() is special, and only returns methods for
	378	* already known names, i.e. it refuses to work if no name_id can be found
	379	* (it's considered an internal programming error).
	380	* This is meant to be used when one method needs to fetch an associated
	381	* other method.
	382	*/
	383	void evp_generic_fetch_by_number(OPENSSL_CTX libctx, int operation_id,
	384	int name_id, const char *properties,
	385	void (new_method)(int name_id,
	386	const OSSL_DISPATCH *fns,
	387	OSSL_PROVIDER *prov,
	388	void *method_data),
	389	void *method_data,
	390	int (up_ref_method)(void ),
	391	void (free_method)(void ))
	392	{
	393	return inner_generic_fetch(libctx,
	394	operation_id, name_id, NULL, properties,
	395	new_method, method_data,
	396	up_ref_method, free_method);
	397	}
	398
cb929645 RL	399	int EVP_set_default_properties(OPENSSL_CTX libctx, const char propq)
	400	{
	401	OSSL_METHOD_STORE *store = get_default_method_store(libctx);
	402
	403	if (store != NULL)
	404	return ossl_method_store_set_global_properties(store, propq);
	405	EVPerr(EVP_F_EVP_SET_DEFAULT_PROPERTIES, ERR_R_INTERNAL_ERROR);
	406	return 0;
	407	}
3d96a51c RL	408
	409	struct do_all_data_st {
	410	void (user_fn)(void method, void *arg);
	411	void *user_arg;
f7c16d48	412	void (new_method)(const int name_id, const OSSL_DISPATCH *fns,
3ca9d210	413	OSSL_PROVIDER prov, void method_data);
4dc0d81a	414	void *method_data;
3d96a51c RL	415	void (free_method)(void );
	416	};
	417
	418	static void do_one(OSSL_PROVIDER provider, const OSSL_ALGORITHM algo,
	419	int no_store, void *vdata)
	420	{
	421	struct do_all_data_st *data = vdata;
f7c16d48 RL	422	OPENSSL_CTX *libctx = ossl_provider_library_context(provider);
f7c16d48 RL	423	OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx);
695d195b	424	int name_id = add_names_to_namemap(namemap, algo->algorithm_names);
f7c16d48 RL	425	void *method = NULL;
	426
	427	if (name_id != 0)
	428	method = data->new_method(name_id, algo->implementation, provider,
4dc0d81a	429	data->method_data);
3d96a51c RL	430
	431	if (method != NULL) {
	432	data->user_fn(method, data->user_arg);
	433	data->free_method(method);
	434	}
	435	}
	436
	437	void evp_generic_do_all(OPENSSL_CTX *libctx, int operation_id,
	438	void (user_fn)(void method, void *arg),
	439	void *user_arg,
f7c16d48	440	void (new_method)(int name_id,
3d96a51c	441	const OSSL_DISPATCH *fns,
3ca9d210 RL	442	OSSL_PROVIDER *prov,
	443	void *method_data),
	444	void *method_data,
3d96a51c RL	445	void (free_method)(void ))
	446	{
	447	struct do_all_data_st data;
	448
	449	data.new_method = new_method;
4dc0d81a	450	data.method_data = method_data;
3d96a51c RL	451	data.free_method = free_method;
	452	data.user_fn = user_fn;
	453	data.user_arg = user_arg;
4dc0d81a	454	ossl_algorithm_do_all(libctx, operation_id, NULL, do_one, &data);
3d96a51c	455	}
f7c16d48 RL	456
	457	const char evp_first_name(OSSL_PROVIDER prov, int name_id)
	458	{
	459	OPENSSL_CTX *libctx = ossl_provider_library_context(prov);
	460	OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx);
	461
	462	return ossl_namemap_num2name(namemap, name_id, 0);
	463	}
7cfa1717 RL	464
	465	int evp_is_a(OSSL_PROVIDER prov, int number, const char name)
	466	{
	467	OPENSSL_CTX *libctx = ossl_provider_library_context(prov);
	468	OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx);
	469
	470	return ossl_namemap_name2num(namemap, name) == number;
	471	}
32040838	472
f651c727 RL	473	void evp_names_do_all(OSSL_PROVIDER *prov, int number,
	474	void (fn)(const char name, void *data),
	475	void *data)
32040838 RL	476	{
	477	OPENSSL_CTX *libctx = ossl_provider_library_context(prov);
	478	OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx);
	479
	480	ossl_namemap_doall_names(namemap, number, fn, data);
	481	}