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swh:1:snp:dc2a5002442a00b1c0eda7c65d04ea7455e166cd
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  • 2ce55cf
  • /
  • crypto
  • /
  • core_algorithm.c
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Tip revision: b4e83ed7cd99c12d27e0e220c3afa1745a68f921 authored by Matt Caswell on 14 December 2021, 16:16:25 UTC
Prepare for release of 3.0.1
Tip revision: b4e83ed
core_algorithm.c
/*
 * 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, void *data, int *result);
    void (*fn)(OSSL_PROVIDER *, const OSSL_ALGORITHM *, int no_store,
               void *data);
    int (*post)(OSSL_PROVIDER *, int operation_id, int no_store, void *data,
                int *result);
    void *data;
};

static int algorithm_do_this(OSSL_PROVIDER *provider, void *cbdata)
{
    struct algorithm_data_st *data = cbdata;
    int no_store = 0;    /* Assume caching is ok */
    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++) {
        const OSSL_ALGORITHM *map = NULL;
        int ret;

        /* 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, data->data, &ret))
                /* Error, bail out! */
                return 0;
        }

        /* If pre-condition not fulfilled, go to the next operation */
        if (!ret)
            continue;

        map = ossl_provider_query_operation(provider, cur_operation,
                                            &no_store);
        if (map != NULL) {
            const OSSL_ALGORITHM *thismap;

            for (thismap = map; thismap->algorithm_names != NULL; thismap++)
                data->fn(provider, thismap, no_store, data->data);
        }
        ossl_provider_unquery_operation(provider, cur_operation, map);

        /* 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! */
                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,
                                      void *data, int *result),
                           void (*fn)(OSSL_PROVIDER *provider,
                                      const OSSL_ALGORITHM *algo,
                                      int no_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.fn = fn;
    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);
    if (ret == NULL)
        ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
    return ret;
}

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