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/*
* Copyright 2019-2021 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 <openssl/core.h>
#include <openssl/core_dispatch.h>
#include "internal/core.h"
#include "internal/property.h"
#include "internal/provider.h"
struct algorithm_data_st {
OSSL_LIB_CTX *libctx;
int operation_id; /* May be zero for finding them all */
int (*pre)(OSSL_PROVIDER *, int operation_id, int no_store, void *data,
int *result);
int (*reserve_store)(int no_store, void *data);
void (*fn)(OSSL_PROVIDER *, const OSSL_ALGORITHM *, int no_store,
void *data);
int (*unreserve_store)(void *data);
int (*post)(OSSL_PROVIDER *, int operation_id, int no_store, void *data,
int *result);
void *data;
};
/*
* Process one OSSL_ALGORITHM array, for the operation |cur_operation|,
* by constructing methods for all its implementations and adding those
* to the appropriate method store.
* Which method store is appropriate is given by |no_store| ("permanent"
* if 0, temporary if 1) and other data in |data->data|.
*
* Returns:
* -1 to quit adding algorithm implementations immediately
* 0 if not successful, but adding should continue
* 1 if successful so far, and adding should continue
*/
static int algorithm_do_map(OSSL_PROVIDER *provider, const OSSL_ALGORITHM *map,
int cur_operation, int no_store, void *cbdata)
{
struct algorithm_data_st *data = cbdata;
int ret = 0;
if (!data->reserve_store(no_store, data->data))
/* Error, bail out! */
return -1;
/* Do we fulfill pre-conditions? */
if (data->pre == NULL) {
/* If there is no pre-condition function, assume "yes" */
ret = 1;
} else if (!data->pre(provider, cur_operation, no_store, data->data,
&ret)) {
/* Error, bail out! */
ret = -1;
goto end;
}
/*
* If pre-condition not fulfilled don't add this set of implementations,
* but do continue with the next. This simply means that another thread
* got to it first.
*/
if (ret == 0) {
ret = 1;
goto end;
}
if (map != NULL) {
const OSSL_ALGORITHM *thismap;
for (thismap = map; thismap->algorithm_names != NULL; thismap++)
data->fn(provider, thismap, no_store, data->data);
}
/* Do we fulfill post-conditions? */
if (data->post == NULL) {
/* If there is no post-condition function, assume "yes" */
ret = 1;
} else if (!data->post(provider, cur_operation, no_store, data->data,
&ret)) {
/* Error, bail out! */
ret = -1;
}
end:
data->unreserve_store(data->data);
return ret;
}
/*
* Given a provider, process one operation given by |data->operation_id|, or
* if that's zero, process all known operations.
* For each such operation, query the associated OSSL_ALGORITHM array from
* the provider, then process that array with |algorithm_do_map()|.
*/
static int algorithm_do_this(OSSL_PROVIDER *provider, void *cbdata)
{
struct algorithm_data_st *data = cbdata;
int first_operation = 1;
int last_operation = OSSL_OP__HIGHEST;
int cur_operation;
int ok = 1;
if (data->operation_id != 0)
first_operation = last_operation = data->operation_id;
for (cur_operation = first_operation;
cur_operation <= last_operation;
cur_operation++) {
int no_store = 0; /* Assume caching is ok */
const OSSL_ALGORITHM *map = NULL;
int ret = 0;
map = ossl_provider_query_operation(provider, cur_operation,
&no_store);
ret = algorithm_do_map(provider, map, cur_operation, no_store, data);
ossl_provider_unquery_operation(provider, cur_operation, map);
if (ret < 0)
/* Hard error, bail out immediately! */
return 0;
/* If post-condition not fulfilled, set general failure */
if (!ret)
ok = 0;
}
return ok;
}
void ossl_algorithm_do_all(OSSL_LIB_CTX *libctx, int operation_id,
OSSL_PROVIDER *provider,
int (*pre)(OSSL_PROVIDER *, int operation_id,
int no_store, void *data, int *result),
int (*reserve_store)(int no_store, void *data),
void (*fn)(OSSL_PROVIDER *provider,
const OSSL_ALGORITHM *algo,
int no_store, void *data),
int (*unreserve_store)(void *data),
int (*post)(OSSL_PROVIDER *, int operation_id,
int no_store, void *data, int *result),
void *data)
{
struct algorithm_data_st cbdata = { 0, };
cbdata.libctx = libctx;
cbdata.operation_id = operation_id;
cbdata.pre = pre;
cbdata.reserve_store = reserve_store;
cbdata.fn = fn;
cbdata.unreserve_store = unreserve_store;
cbdata.post = post;
cbdata.data = data;
if (provider == NULL) {
ossl_provider_doall_activated(libctx, algorithm_do_this, &cbdata);
} else {
OSSL_LIB_CTX *libctx2 = ossl_provider_libctx(provider);
/*
* If a provider is given, its library context MUST match the library
* context we're passed. If this turns out not to be true, there is
* a programming error in the functions up the call stack.
*/
if (!ossl_assert(ossl_lib_ctx_get_concrete(libctx)
== ossl_lib_ctx_get_concrete(libctx2)))
return;
cbdata.libctx = libctx2;
algorithm_do_this(provider, &cbdata);
}
}
char *ossl_algorithm_get1_first_name(const OSSL_ALGORITHM *algo)
{
const char *first_name_end = NULL;
size_t first_name_len = 0;
char *ret;
if (algo->algorithm_names == NULL)
return NULL;
first_name_end = strchr(algo->algorithm_names, ':');
if (first_name_end == NULL)
first_name_len = strlen(algo->algorithm_names);
else
first_name_len = first_name_end - algo->algorithm_names;
ret = OPENSSL_strndup(algo->algorithm_names, first_name_len);
return ret;
}
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