/*

 * Copyright 2020-2021 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 <string.h>

#include <stdio.h>

#include <openssl/opensslconf.h>

#include <openssl/core.h>

#include <openssl/core_dispatch.h>

#include <openssl/core_names.h>

#include <openssl/params.h>

#include "prov/bio.h"

#include "prov/provider_ctx.h"

#include "prov/providercommon.h"

#include "prov/implementations.h"

#include "prov/provider_util.h"

#include "internal/nelem.h"

/*

 * Forward declarations to ensure that interface functions are correctly

 * defined.

 */

static OSSL_FUNC_provider_gettable_params_fn base_gettable_params;

static OSSL_FUNC_provider_get_params_fn base_get_params;

static OSSL_FUNC_provider_query_operation_fn base_query;

/* Functions provided by the core */

static OSSL_FUNC_core_gettable_params_fn *c_gettable_params = NULL;

static OSSL_FUNC_core_get_params_fn *c_get_params = NULL;

/* Parameters we provide to the core */

static const OSSL_PARAM base_param_types[] = {

    OSSL_PARAM_DEFN(OSSL_PROV_PARAM_NAME, OSSL_PARAM_UTF8_PTR, NULL, 0),

    OSSL_PARAM_DEFN(OSSL_PROV_PARAM_VERSION, OSSL_PARAM_UTF8_PTR, NULL, 0),

    OSSL_PARAM_DEFN(OSSL_PROV_PARAM_BUILDINFO, OSSL_PARAM_UTF8_PTR, NULL, 0),

    OSSL_PARAM_DEFN(OSSL_PROV_PARAM_STATUS, OSSL_PARAM_INTEGER, NULL, 0),

    OSSL_PARAM_END

};

static const OSSL_PARAM *base_gettable_params(void *provctx)

{

    return base_param_types;

}

static int base_get_params(void *provctx, OSSL_PARAM params[])

{

    OSSL_PARAM *p;

    p = OSSL_PARAM_locate(params, OSSL_PROV_PARAM_NAME);

    if (p != NULL

            && !OSSL_PARAM_set_utf8_ptr(p, "OpenSSL Base Provider"))

        return 0;

    p = OSSL_PARAM_locate(params, OSSL_PROV_PARAM_VERSION);

    if (p != NULL && !OSSL_PARAM_set_utf8_ptr(p, OPENSSL_VERSION_STR))

        return 0;

    p = OSSL_PARAM_locate(params, OSSL_PROV_PARAM_BUILDINFO);

    if (p != NULL && !OSSL_PARAM_set_utf8_ptr(p, OPENSSL_FULL_VERSION_STR))

        return 0;

    p = OSSL_PARAM_locate(params, OSSL_PROV_PARAM_STATUS);

    if (p != NULL && !OSSL_PARAM_set_int(p, ossl_prov_is_running()))

        return 0;

    return 1;

}

static const OSSL_ALGORITHM base_encoder[] = {

#define ENCODER_PROVIDER "base"

#include "encoders.inc"

    { NULL, NULL, NULL }

#undef ENCODER_PROVIDER

};

static const OSSL_ALGORITHM base_decoder[] = {

#define DECODER_PROVIDER "base"

#include "decoders.inc"

    { NULL, NULL, NULL }

#undef DECODER_PROVIDER

};

static const OSSL_ALGORITHM base_store[] = {

#define STORE(name, _fips, func_table)                           \

    { name, "provider=base,fips=" _fips, (func_table) },

#include "stores.inc"

    { NULL, NULL, NULL }

#undef STORE

};

static const OSSL_ALGORITHM *base_query(void *provctx, int operation_id,

                                         int *no_cache)

{

    *no_cache = 0;

    switch (operation_id) {

    case OSSL_OP_ENCODER:

        return base_encoder;

    case OSSL_OP_DECODER:

        return base_decoder;

    case OSSL_OP_STORE:

        return base_store;

    }

    return NULL;

}

static void base_teardown(void *provctx)

{

    BIO_meth_free(ossl_prov_ctx_get0_core_bio_method(provctx));

    ossl_prov_ctx_free(provctx);

}

/* Functions we provide to the core */

static const OSSL_DISPATCH base_dispatch_table[] = {

    { OSSL_FUNC_PROVIDER_TEARDOWN, (void (*)(void))base_teardown },

    { OSSL_FUNC_PROVIDER_GETTABLE_PARAMS,

      (void (*)(void))base_gettable_params },

    { OSSL_FUNC_PROVIDER_GET_PARAMS, (void (*)(void))base_get_params },

    { OSSL_FUNC_PROVIDER_QUERY_OPERATION, (void (*)(void))base_query },

    { 0, NULL }

};

OSSL_provider_init_fn ossl_base_provider_init;

int ossl_base_provider_init(const OSSL_CORE_HANDLE *handle,

                            const OSSL_DISPATCH *in, const OSSL_DISPATCH **out,

                            void **provctx)

{

    OSSL_FUNC_core_get_libctx_fn *c_get_libctx = NULL;

    BIO_METHOD *corebiometh;

    if (!ossl_prov_bio_from_dispatch(in))

        return 0;

    for (; in->function_id != 0; in++) {

        switch (in->function_id) {

        case OSSL_FUNC_CORE_GETTABLE_PARAMS:

            c_gettable_params = OSSL_FUNC_core_gettable_params(in);

            break;

        case OSSL_FUNC_CORE_GET_PARAMS:

            c_get_params = OSSL_FUNC_core_get_params(in);

            break;

        case OSSL_FUNC_CORE_GET_LIBCTX:

            c_get_libctx = OSSL_FUNC_core_get_libctx(in);

            break;

        default:

            /* Just ignore anything we don't understand */

            break;

        }

    }

    if (c_get_libctx == NULL)

        return 0;

    /*

     * We want to make sure that all calls from this provider that requires

     * a library context use the same context as the one used to call our

     * functions.  We do that by passing it along in the provider context.

     *

     * This only works for built-in providers.  Most providers should

     * create their own library context.

     */

    if ((*provctx = ossl_prov_ctx_new()) == NULL

            || (corebiometh = ossl_bio_prov_init_bio_method()) == NULL) {

        ossl_prov_ctx_free(*provctx);

        *provctx = NULL;

        return 0;

    }

    ossl_prov_ctx_set0_libctx(*provctx,

                                       (OSSL_LIB_CTX *)c_get_libctx(handle));

    ossl_prov_ctx_set0_handle(*provctx, handle);

    ossl_prov_ctx_set0_core_bio_method(*provctx, corebiometh);

    *out = base_dispatch_table;

    return 1;

}