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/*
* Copyright 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 <limits.h>
#include <openssl/ech.h>
#include <openssl/err.h>
#include <openssl/bio.h>
#include <openssl/crypto.h>
#include <openssl/e_os2.h>
#include <openssl/byteorder.h>
#include "fuzzer.h"
static void parse_one(const uint8_t *buf, int len)
{
OSSL_ECHSTORE *es;
BIO *in;
es = OSSL_ECHSTORE_new(NULL, NULL);
if (es == NULL)
return;
in = BIO_new_mem_buf(buf, len);
if (in == NULL) {
OSSL_ECHSTORE_free(es);
return;
}
OSSL_ECHSTORE_read_echconfiglist(es, in);
OSSL_ECHSTORE_free(es);
BIO_free(in);
}
int FuzzerInitialize(int *argc, char ***argv)
{
return 1;
}
int FuzzerTestOneInput(const uint8_t *buf, size_t len)
{
uint8_t *fixed_buf = NULL;
int bio_len;
uint16_t outer_len, inner_len;
if (len > INT_MAX)
return 0;
bio_len = (int)len;
/* Target raw without any fixup */
parse_one(buf, bio_len);
/*
* ech_decode_and_flatten has a strict size check:
* OSSL_ECH_MIN_ECHCONFIG_LEN = 32
* OSSL_ECH_MAX_ECHCONFIG_LEN = 1500
*/
if (len < OSSL_ECH_MIN_ECHCONFIG_LEN || len >= OSSL_ECH_MAX_ECHCONFIG_LEN)
goto end;
outer_len = (uint16_t)(len - 2);
inner_len = (uint16_t)(len - 6);
fixed_buf = OPENSSL_memdup(buf, len);
if (fixed_buf == NULL)
goto end;
/* Fix up to pass initial checks*/
OPENSSL_store_u16_be(fixed_buf, outer_len);
OPENSSL_store_u16_be(fixed_buf + 2, OSSL_ECH_RFC9849_VERSION);
OPENSSL_store_u16_be(fixed_buf + 4, inner_len);
parse_one(fixed_buf, bio_len);
end:
OPENSSL_free(fixed_buf);
ERR_clear_error();
return 0;
}
void FuzzerCleanup(void)
{
}
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