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/*
* 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/ossl_typ.h>
#include <openssl/evp.h>
#include <openssl/core.h>
#include "internal/cryptlib.h"
#include "internal/thread_once.h"
#include "internal/asn1_int.h"
#include "internal/property.h"
#include "internal/core.h"
#include "internal/evp_int.h" /* evp_locl.h needs it */
#include "evp_locl.h"
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 {
const char *name;
int nid;
OSSL_METHOD_CONSTRUCT_METHOD *mcm;
void *(*method_from_dispatch)(int nid, const OSSL_DISPATCH *,
OSSL_PROVIDER *);
int (*refcnt_up_method)(void *method);
void (*destruct_method)(void *method);
int (*nid_method)(void *method);
};
/*
* 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);
}
static void *get_method_from_store(OPENSSL_CTX *libctx, void *store,
const char *propquery, void *data)
{
struct method_data_st *methdata = data;
void *method = NULL;
if (store == NULL
&& (store = get_default_method_store(libctx)) == NULL)
return NULL;
(void)ossl_method_store_fetch(store, methdata->nid, 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,
const char *propdef,
void *method, void *data)
{
struct method_data_st *methdata = data;
int nid = methdata->nid_method(method);
if (nid == NID_undef)
return 0;
if (store == NULL
&& (store = get_default_method_store(libctx)) == NULL)
return 0;
if (methdata->refcnt_up_method(method)
&& ossl_method_store_add(store, nid, propdef, method,
methdata->destruct_method))
return 1;
return 0;
}
static void *construct_method(const char *algorithm_name,
const OSSL_DISPATCH *fns, OSSL_PROVIDER *prov,
void *data)
{
struct method_data_st *methdata = data;
void *method = NULL;
int nid = OBJ_sn2nid(algorithm_name);
if (nid == NID_undef) {
/* Create a new NID for that name on the fly */
ASN1_OBJECT tmpobj;
/* This is the same as OBJ_create() but without requiring a OID */
tmpobj.nid = OBJ_new_nid(1);
tmpobj.sn = tmpobj.ln = methdata->name;
tmpobj.flags = ASN1_OBJECT_FLAG_DYNAMIC;
tmpobj.length = 0;
tmpobj.data = NULL;
nid = OBJ_add_object(&tmpobj);
}
if (nid == NID_undef)
return NULL;
method = methdata->method_from_dispatch(nid, fns, prov);
if (method == NULL)
return NULL;
return method;
}
static void destruct_method(void *method, void *data)
{
struct method_data_st *methdata = data;
methdata->destruct_method(method);
}
void *evp_generic_fetch(OPENSSL_CTX *libctx, int operation_id,
const char *algorithm, const char *properties,
void *(*new_method)(int nid, const OSSL_DISPATCH *fns,
OSSL_PROVIDER *prov),
int (*upref_method)(void *),
void (*free_method)(void *),
int (*nid_method)(void *))
{
OSSL_METHOD_STORE *store = get_default_method_store(libctx);
int nid = OBJ_sn2nid(algorithm);
void *method = NULL;
if (store == NULL)
return NULL;
if (nid == NID_undef
|| !ossl_method_store_cache_get(store, nid, 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.nid = nid;
mcmdata.mcm = &mcm;
mcmdata.method_from_dispatch = new_method;
mcmdata.destruct_method = free_method;
mcmdata.refcnt_up_method = upref_method;
mcmdata.destruct_method = free_method;
mcmdata.nid_method = nid_method;
method = ossl_method_construct(libctx, operation_id, algorithm,
properties, 0 /* !force_cache */,
&mcm, &mcmdata);
ossl_method_store_cache_set(store, nid, properties, method);
} else {
upref_method(method);
}
return 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;
}
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