/*

 * Copyright 2023-2026 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 may obtain a copy of the License at

 * https://www.openssl.org/source/license.html

 * or in the file LICENSE in the source distribution.

 */

#include <openssl/decoder.h>

#include <openssl/err.h>

#include <openssl/rand.h>

#include "fuzzer.h"

static ASN1_PCTX *pctx;

int FuzzerInitialize(int *argc, char ***argv)

{

    FuzzerSetRand();

    OPENSSL_init_crypto(OPENSSL_INIT_LOAD_CRYPTO_STRINGS

            | OPENSSL_INIT_ADD_ALL_CIPHERS

            | OPENSSL_INIT_ADD_ALL_DIGESTS,

        NULL);

    pctx = ASN1_PCTX_new();

    if (pctx == NULL)

        return 0;

    ASN1_PCTX_set_flags(pctx, ASN1_PCTX_FLAGS_SHOW_ABSENT | ASN1_PCTX_FLAGS_SHOW_SEQUENCE | ASN1_PCTX_FLAGS_SHOW_SSOF | ASN1_PCTX_FLAGS_SHOW_TYPE | ASN1_PCTX_FLAGS_SHOW_FIELD_STRUCT_NAME);

    ASN1_PCTX_set_str_flags(pctx, ASN1_STRFLGS_UTF8_CONVERT | ASN1_STRFLGS_SHOW_TYPE | ASN1_STRFLGS_DUMP_ALL);

    ERR_clear_error();

    CRYPTO_free_ex_index(0, -1);

    return 1;

}

int FuzzerTestOneInput(const uint8_t *buf, size_t len)

{

    OSSL_DECODER_CTX *dctx;

    EVP_PKEY *pkey = NULL;

    EVP_PKEY_CTX *ctx = NULL;

    BIO *bio;

    bio = BIO_new(BIO_s_null());

    if (bio == NULL) {

        ERR_clear_error();

        return 0;

    }

    dctx = OSSL_DECODER_CTX_new_for_pkey(&pkey, NULL, NULL, NULL, 0, NULL,

        NULL);

    if (dctx == NULL) {

        BIO_free(bio);

        ERR_clear_error();

        return 0;

    }

    if (OSSL_DECODER_from_data(dctx, &buf, &len)) {

        EVP_PKEY *pkey2;

        EVP_PKEY_print_public(bio, pkey, 1, pctx);

        EVP_PKEY_print_private(bio, pkey, 1, pctx);

        EVP_PKEY_print_params(bio, pkey, 1, pctx);

        pkey2 = EVP_PKEY_dup(pkey);

        if (pkey2 != NULL) {

            EVP_PKEY_eq(pkey, pkey2);

            EVP_PKEY_free(pkey2);

        }

        ctx = EVP_PKEY_CTX_new(pkey, NULL);

        if (ctx != NULL) {

            /*

             * Param check will take too long time on large DH parameters.

             * Skip it.

             */

            if ((!EVP_PKEY_is_a(pkey, "DH") && !EVP_PKEY_is_a(pkey, "DHX"))

                || EVP_PKEY_get_bits(pkey) <= 2048)

                EVP_PKEY_param_check(ctx);

            EVP_PKEY_public_check(ctx);

            /* Private and pairwise checks are unbounded, skip for large keys. */

            if (EVP_PKEY_get_bits(pkey) <= 4096) {

                EVP_PKEY_private_check(ctx);

                EVP_PKEY_pairwise_check(ctx);

            }

            EVP_PKEY_CTX_free(ctx);

        }

        EVP_PKEY_free(pkey);

    }

    OSSL_DECODER_CTX_free(dctx);

    BIO_free(bio);

    ERR_clear_error();

    return 0;

}

void FuzzerCleanup(void)

{

    ASN1_PCTX_free(pctx);

    FuzzerClearRand();

}