/*

 * Copyright 2022-2023 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/evp.h>

#include <openssl/err.h>

#include <openssl/core.h>

#include <openssl/core_dispatch.h>

#include "internal/provider.h"

#include "internal/core.h"

#include "crypto/evp.h"

#include "evp_local.h"

static int evp_mac_up_ref(void *vmac)

{

    EVP_MAC *mac = vmac;

    int ref = 0;

    CRYPTO_UP_REF(&mac->refcnt, &ref);

    return 1;

}

static void evp_mac_free(void *vmac)

{

    EVP_MAC *mac = vmac;

    int ref = 0;

    if (mac == NULL)

        return;

    CRYPTO_DOWN_REF(&mac->refcnt, &ref);

    if (ref > 0)

        return;

    OPENSSL_free(mac->type_name);

    ossl_provider_free(mac->prov);

    CRYPTO_FREE_REF(&mac->refcnt);

    OPENSSL_free(mac);

}

static void *evp_mac_new(void)

{

    EVP_MAC *mac = NULL;

    if ((mac = OPENSSL_zalloc(sizeof(*mac))) == NULL

        || !CRYPTO_NEW_REF(&mac->refcnt, 1)) {

        evp_mac_free(mac);

        return NULL;

    }

    return mac;

}

static void *evp_mac_from_algorithm(int name_id,

                                    const OSSL_ALGORITHM *algodef,

                                    OSSL_PROVIDER *prov)

{

    const OSSL_DISPATCH *fns = algodef->implementation;

    EVP_MAC *mac = NULL;

    int fnmaccnt = 0, fnctxcnt = 0;

    if ((mac = evp_mac_new()) == NULL) {

        ERR_raise(ERR_LIB_EVP, ERR_R_EVP_LIB);

        return NULL;

    }

    mac->name_id = name_id;

    if ((mac->type_name = ossl_algorithm_get1_first_name(algodef)) == NULL) {

        evp_mac_free(mac);

        return NULL;

    }

    mac->description = algodef->algorithm_description;

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

        switch (fns->function_id) {

        case OSSL_FUNC_MAC_NEWCTX:

            if (mac->newctx != NULL)

                break;

            mac->newctx = OSSL_FUNC_mac_newctx(fns);

            fnctxcnt++;

            break;

        case OSSL_FUNC_MAC_DUPCTX:

            if (mac->dupctx != NULL)

                break;

            mac->dupctx = OSSL_FUNC_mac_dupctx(fns);

            break;

        case OSSL_FUNC_MAC_FREECTX:

            if (mac->freectx != NULL)

                break;

            mac->freectx = OSSL_FUNC_mac_freectx(fns);

            fnctxcnt++;

            break;

        case OSSL_FUNC_MAC_INIT:

            if (mac->init != NULL)

                break;

            mac->init = OSSL_FUNC_mac_init(fns);

            fnmaccnt++;

            break;

        case OSSL_FUNC_MAC_UPDATE:

            if (mac->update != NULL)

                break;

            mac->update = OSSL_FUNC_mac_update(fns);

            fnmaccnt++;

            break;

        case OSSL_FUNC_MAC_FINAL:

            if (mac->final != NULL)

                break;

            mac->final = OSSL_FUNC_mac_final(fns);

            fnmaccnt++;

            break;

        case OSSL_FUNC_MAC_GETTABLE_PARAMS:

            if (mac->gettable_params != NULL)

                break;

            mac->gettable_params =

                OSSL_FUNC_mac_gettable_params(fns);

            break;

        case OSSL_FUNC_MAC_GETTABLE_CTX_PARAMS:

            if (mac->gettable_ctx_params != NULL)

                break;

            mac->gettable_ctx_params =

                OSSL_FUNC_mac_gettable_ctx_params(fns);

            break;

        case OSSL_FUNC_MAC_SETTABLE_CTX_PARAMS:

            if (mac->settable_ctx_params != NULL)

                break;

            mac->settable_ctx_params =

                OSSL_FUNC_mac_settable_ctx_params(fns);

            break;

        case OSSL_FUNC_MAC_GET_PARAMS:

            if (mac->get_params != NULL)

                break;

            mac->get_params = OSSL_FUNC_mac_get_params(fns);

            break;

        case OSSL_FUNC_MAC_GET_CTX_PARAMS:

            if (mac->get_ctx_params != NULL)

                break;

            mac->get_ctx_params = OSSL_FUNC_mac_get_ctx_params(fns);

            break;

        case OSSL_FUNC_MAC_SET_CTX_PARAMS:

            if (mac->set_ctx_params != NULL)

                break;

            mac->set_ctx_params = OSSL_FUNC_mac_set_ctx_params(fns);

            break;

        }

    }

    if (fnmaccnt != 3

        || fnctxcnt != 2) {

        /*

         * In order to be a consistent set of functions we must have at least

         * a complete set of "mac" functions, and a complete set of context

         * management functions, as well as the size function.

         */

        evp_mac_free(mac);

        ERR_raise(ERR_LIB_EVP, EVP_R_INVALID_PROVIDER_FUNCTIONS);

        return NULL;

    }

    mac->prov = prov;

    if (prov != NULL)

        ossl_provider_up_ref(prov);

    return mac;

}

EVP_MAC *EVP_MAC_fetch(OSSL_LIB_CTX *libctx, const char *algorithm,

                       const char *properties)

{

    return evp_generic_fetch(libctx, OSSL_OP_MAC, algorithm, properties,

                             evp_mac_from_algorithm, evp_mac_up_ref,

                             evp_mac_free);

}

int EVP_MAC_up_ref(EVP_MAC *mac)

{

    return evp_mac_up_ref(mac);

}

void EVP_MAC_free(EVP_MAC *mac)

{

    evp_mac_free(mac);

}

const OSSL_PROVIDER *EVP_MAC_get0_provider(const EVP_MAC *mac)

{

    return mac->prov;

}

const OSSL_PARAM *EVP_MAC_gettable_params(const EVP_MAC *mac)

{

    if (mac->gettable_params == NULL)

        return NULL;

    return mac->gettable_params(ossl_provider_ctx(EVP_MAC_get0_provider(mac)));

}

const OSSL_PARAM *EVP_MAC_gettable_ctx_params(const EVP_MAC *mac)

{

    void *alg;

    if (mac->gettable_ctx_params == NULL)

        return NULL;

    alg = ossl_provider_ctx(EVP_MAC_get0_provider(mac));

    return mac->gettable_ctx_params(NULL, alg);

}

const OSSL_PARAM *EVP_MAC_settable_ctx_params(const EVP_MAC *mac)

{

    void *alg;

    if (mac->settable_ctx_params == NULL)

        return NULL;

    alg = ossl_provider_ctx(EVP_MAC_get0_provider(mac));

    return mac->settable_ctx_params(NULL, alg);

}

const OSSL_PARAM *EVP_MAC_CTX_gettable_params(EVP_MAC_CTX *ctx)

{

    void *alg;

    if (ctx->meth->gettable_ctx_params == NULL)

        return NULL;

    alg = ossl_provider_ctx(EVP_MAC_get0_provider(ctx->meth));

    return ctx->meth->gettable_ctx_params(ctx->algctx, alg);

}

const OSSL_PARAM *EVP_MAC_CTX_settable_params(EVP_MAC_CTX *ctx)

{

    void *alg;

    if (ctx->meth->settable_ctx_params == NULL)

        return NULL;

    alg = ossl_provider_ctx(EVP_MAC_get0_provider(ctx->meth));

    return ctx->meth->settable_ctx_params(ctx->algctx, alg);

}

void EVP_MAC_do_all_provided(OSSL_LIB_CTX *libctx,

                             void (*fn)(EVP_MAC *mac, void *arg),

                             void *arg)

{

    evp_generic_do_all(libctx, OSSL_OP_MAC,

                       (void (*)(void *, void *))fn, arg,

                       evp_mac_from_algorithm, evp_mac_up_ref, evp_mac_free);

}