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       1                 :            : /*
       2                 :            :  * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
       3                 :            :  *
       4                 :            :  * Licensed under the Apache License, Version 2.0 (the "License").
       5                 :            :  * You may not use this file except in compliance with the License.
       6                 :            :  * A copy of the License is located at
       7                 :            :  *
       8                 :            :  *  http://aws.amazon.com/apache2.0
       9                 :            :  *
      10                 :            :  * or in the "license" file accompanying this file. This file is distributed
      11                 :            :  * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
      12                 :            :  * express or implied. See the License for the specific language governing
      13                 :            :  * permissions and limitations under the License.
      14                 :            :  */
      15                 :            : 
      16                 :            : #pragma once
      17                 :            : 
      18                 :            : #include <stdint.h>
      19                 :            : 
      20                 :            : #include "crypto/s2n_hkdf.h"
      21                 :            : #include "crypto/s2n_hmac.h"
      22                 :            : #include "stuffer/s2n_stuffer.h"
      23                 :            : #include "tls/s2n_psk.h"
      24                 :            : #include "tls/s2n_tls_parameters.h"
      25                 :            : #include "utils/s2n_blob.h"
      26                 :            : #include "utils/s2n_mem.h"
      27                 :            : #include "utils/s2n_safety.h"
      28                 :            : 
      29                 :            : /* Unlike TLS1.2 secrets, TLS1.3 secret lengths vary depending
      30                 :            :  * on the hash algorithm used to calculate them.
      31                 :            :  * We allocate enough space for the largest possible secret.
      32                 :            :  * At the moment, that is 48 bytes for S2N_HASH_SHA384 and
      33                 :            :  * matches the TLS1.2 secret length.
      34                 :            :  */
      35                 :            : #define S2N_TLS13_SECRET_MAX_LEN SHA384_DIGEST_LENGTH
      36                 :            : 
      37                 :            : struct s2n_tls13_keys {
      38                 :            :     s2n_hmac_algorithm hmac_algorithm;
      39                 :            :     s2n_hash_algorithm hash_algorithm;
      40                 :            : 
      41                 :            :     uint8_t size;
      42                 :            : 
      43                 :            :     /* we only need to keep these 2 rolling secrets at any point,
      44                 :            :      * since other secrets to be used can be generated from these
      45                 :            :      */
      46                 :            :     struct s2n_blob extract_secret;
      47                 :            :     struct s2n_blob derive_secret;
      48                 :            :     uint8_t extract_secret_bytes[S2N_TLS13_SECRET_MAX_LEN];
      49                 :            :     uint8_t derive_secret_bytes[S2N_TLS13_SECRET_MAX_LEN];
      50                 :            : 
      51                 :            :     struct s2n_hmac_state hmac;
      52                 :            : };
      53                 :            : 
      54                 :            : /* Defines TLS 1.3 HKDF Labels */
      55                 :            : extern const struct s2n_blob s2n_tls13_label_derived_secret;
      56                 :            : extern const struct s2n_blob s2n_tls13_label_external_psk_binder_key;
      57                 :            : extern const struct s2n_blob s2n_tls13_label_resumption_psk_binder_key;
      58                 :            : 
      59                 :            : extern const struct s2n_blob s2n_tls13_label_client_early_traffic_secret;
      60                 :            : extern const struct s2n_blob s2n_tls13_label_early_exporter_master_secret;
      61                 :            : 
      62                 :            : extern const struct s2n_blob s2n_tls13_label_client_handshake_traffic_secret;
      63                 :            : extern const struct s2n_blob s2n_tls13_label_server_handshake_traffic_secret;
      64                 :            : 
      65                 :            : extern const struct s2n_blob s2n_tls13_label_client_application_traffic_secret;
      66                 :            : extern const struct s2n_blob s2n_tls13_label_server_application_traffic_secret;
      67                 :            : 
      68                 :            : extern const struct s2n_blob s2n_tls13_label_exporter_master_secret;
      69                 :            : extern const struct s2n_blob s2n_tls13_label_resumption_master_secret;
      70                 :            : 
      71                 :            : extern const struct s2n_blob s2n_tls13_label_finished;
      72                 :            : 
      73                 :            : extern const struct s2n_blob s2n_tls13_label_exporter;
      74                 :            : 
      75                 :            : /* Traffic secret labels */
      76                 :            : 
      77                 :            : extern const struct s2n_blob s2n_tls13_label_traffic_secret_key;
      78                 :            : extern const struct s2n_blob s2n_tls13_label_traffic_secret_iv;
      79                 :            : 
      80                 :            : #define s2n_tls13_key_blob(name, bytes) \
      81                 :      26493 :     s2n_stack_blob(name, bytes, S2N_TLS13_SECRET_MAX_LEN)
      82                 :            : 
      83                 :            : int s2n_tls13_keys_init(struct s2n_tls13_keys *handshake, s2n_hmac_algorithm alg);
      84                 :            : int s2n_tls13_keys_free(struct s2n_tls13_keys *keys);
      85                 :            : 
      86                 :            : int s2n_tls13_derive_traffic_keys(struct s2n_tls13_keys *handshake, struct s2n_blob *secret, struct s2n_blob *key, struct s2n_blob *iv);
      87                 :            : int s2n_tls13_derive_finished_key(struct s2n_tls13_keys *keys, struct s2n_blob *secret_key, struct s2n_blob *output_finish_key);
      88                 :            : int s2n_tls13_calculate_finished_mac(struct s2n_tls13_keys *keys, struct s2n_blob *finished_key, struct s2n_hash_state *hash_state, struct s2n_blob *finished_verify);
      89                 :            : int s2n_tls13_update_application_traffic_secret(struct s2n_tls13_keys *keys, struct s2n_blob *old_secret, struct s2n_blob *new_secret);
      90                 :            : S2N_RESULT s2n_tls13_derive_session_ticket_secret(struct s2n_tls13_keys *keys, struct s2n_blob *resumption_secret,
      91                 :            :         struct s2n_blob *ticket_nonce, struct s2n_blob *secret_blob);