text: /*
   * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
   *
   * Licensed under the Apache License, Version 2.0 (the "License").
   * You may not use this file except in compliance with the License.
   * A copy of the License is located at
   *
   *  http://aws.amazon.com/apache2.0
   *
   * or in the "license" file accompanying this file. This file is distributed
   * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
   * express or implied. See the License for the specific language governing
   * permissions and limitations under the License.
   */
  
  /* Target Functions: s2n_extensions_client_key_share_recv s2n_ecc_evp_read_params_point
                       s2n_ecc_evp_parse_params_point  s2n_ecc_evp_params_free */
  
  #include <stdint.h>
  
  #include <openssl/crypto.h>
  #include <openssl/err.h>
  
  #include "tls/extensions/s2n_client_key_share.h"
  
  #include "api/s2n.h"
  #include "stuffer/s2n_stuffer.h"
  #include "tls/s2n_connection.h"
  #include "tls/s2n_tls.h"
  #include "utils/s2n_safety.h"
  #include "s2n_test.h"
  #include "testlib/s2n_testlib.h"
  #include "tls/s2n_tls13.h"
  
  /* This test is for TLS versions 1.3 and up only */
  static const uint8_t TLS_VERSIONS[] = {S2N_TLS13};
  
  int s2n_fuzz_init(int *argc, char **argv[])
  {
      POSIX_GUARD(s2n_enable_tls13_in_test());
      return S2N_SUCCESS;
  }
  
  int s2n_fuzz_test(const uint8_t *buf, size_t len)
  {
      /* We need at least one byte of input to set parameters */
      S2N_FUZZ_ENSURE_MIN_LEN(len, 1);
  
      /* Setup */
      struct s2n_stuffer fuzz_stuffer = {0};
      POSIX_GUARD(s2n_stuffer_alloc(&fuzz_stuffer, len));
      POSIX_GUARD(s2n_stuffer_write_bytes(&fuzz_stuffer, buf, len));
  
      struct s2n_connection *server_conn = s2n_connection_new(S2N_SERVER);
      POSIX_ENSURE_REF(server_conn);
  
      /* Pull a byte off the libfuzzer input and use it to set parameters */
      uint8_t randval = 0;
      POSIX_GUARD(s2n_stuffer_read_uint8(&fuzz_stuffer, &randval));
      server_conn->actual_protocol_version = TLS_VERSIONS[randval % s2n_array_len(TLS_VERSIONS)];
  
      /* Run Test
       * Do not use GUARD macro here since the connection memory hasn't been freed.
       */
      s2n_extensions_client_key_share_recv(server_conn, &fuzz_stuffer);
  
      /* Cleanup */
      POSIX_GUARD(s2n_connection_free(server_conn));
      POSIX_GUARD(s2n_stuffer_free(&fuzz_stuffer));
  
      return S2N_SUCCESS;
  }
  
  S2N_FUZZ_TARGET(s2n_fuzz_init, s2n_fuzz_test, NULL)
  