text: /*
   * Copyright 2018 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.
   */
  
  #pragma once
  
  #include "tls/s2n_config.h"
  
  #include "crypto/s2n_certificate.h"
  #include "crypto/s2n_cipher.h"
  #include "crypto/s2n_hmac.h"
  #include "crypto/s2n_hash.h"
  #include "crypto/s2n_pkey.h"
  #include "crypto/s2n_signature.h"
  #include "crypto/s2n_dhe.h"
  #include "crypto/s2n_ecc.h"
  
  #define S2N_TLS_SECRET_LEN             48
  #define S2N_TLS_RANDOM_DATA_LEN        32
  #define S2N_TLS_SEQUENCE_NUM_LEN        8
  #define S2N_TLS_CIPHER_SUITE_LEN        2
  #define S2N_SSLv2_CIPHER_SUITE_LEN      3
  #define S2N_TLS_FINISHED_LEN           12
  #define S2N_SSL_FINISHED_LEN           36
  #define S2N_TLS_MAX_IV_LEN             16
  
  /* From RFC 5246 6.2.3.3 */
  #define S2N_TLS12_AAD_LEN              13
  #define S2N_TLS_MAX_AAD_LEN            S2N_TLS12_AAD_LEN
  #define S2N_TLS_GCM_FIXED_IV_LEN        4
  #define S2N_TLS_GCM_EXPLICIT_IV_LEN     8
  #define S2N_TLS_GCM_IV_LEN            (S2N_TLS_GCM_FIXED_IV_LEN + S2N_TLS_GCM_EXPLICIT_IV_LEN)
  #define S2N_TLS_GCM_TAG_LEN            16
  
  /* From RFC 7905 */
  #define S2N_TLS_CHACHA20_POLY1305_FIXED_IV_LEN    12
  #define S2N_TLS_CHACHA20_POLY1305_EXPLICIT_IV_LEN  0
  #define S2N_TLS_CHACHA20_POLY1305_IV_LEN          12
  #define S2N_TLS_CHACHA20_POLY1305_KEY_LEN         32
  #define S2N_TLS_CHACHA20_POLY1305_TAG_LEN         16
  
  /* RFC 5246 7.4.1.2 */
  #define S2N_TLS_SESSION_ID_MAX_LEN     32
  
  struct s2n_kem_keypair {
      const struct s2n_kem *negotiated_kem;
      struct s2n_blob public_key;
      struct s2n_blob private_key;
  };
  
  struct s2n_crypto_parameters {
      struct s2n_pkey server_public_key;
      struct s2n_pkey client_public_key;
      struct s2n_dh_params server_dh_params;
      struct s2n_ecc_params server_ecc_params;
      struct s2n_kem_keypair s2n_kem_keys;
      struct s2n_blob client_key_exchange_message;
      struct s2n_blob client_pq_kem_extension;
      s2n_hash_algorithm conn_hash_alg;
      s2n_signature_algorithm conn_sig_alg;
      struct s2n_blob client_cert_chain;
      s2n_cert_type client_cert_type;
      s2n_hash_algorithm client_cert_hash_algorithm;
      s2n_signature_algorithm client_cert_sig_alg;
  
      struct s2n_cipher_suite *cipher_suite;
      struct s2n_session_key client_key;
      struct s2n_session_key server_key;
  
      uint8_t rsa_premaster_secret[S2N_TLS_SECRET_LEN];
      uint8_t master_secret[S2N_TLS_SECRET_LEN];
      uint8_t client_random[S2N_TLS_RANDOM_DATA_LEN];
      uint8_t server_random[S2N_TLS_RANDOM_DATA_LEN];
      uint8_t client_implicit_iv[S2N_TLS_MAX_IV_LEN];
      uint8_t server_implicit_iv[S2N_TLS_MAX_IV_LEN];
  
      struct s2n_hash_state signature_hash;
      struct s2n_hmac_state client_record_mac;
      struct s2n_hmac_state server_record_mac;
      struct s2n_hmac_state record_mac_copy_workspace;
      uint8_t client_sequence_number[S2N_TLS_SEQUENCE_NUM_LEN];
      uint8_t server_sequence_number[S2N_TLS_SEQUENCE_NUM_LEN];
  };
  